Journal of Civil Engineering Researchers
type: channel
description: “Journal of Civil Engineering Researchers” is an independent publisher, consistently working towards being an internationally- recognized publishing company, specializing in high-quality electronic publications. Our Online submission, electronic peer review, and production make the process of publishing your article simple and efficient. Our team of editors makes the right decisions based on the quality of a manuscript and its adherence to the norms of the field. Read more Google Scholar, ISC, and ... Indexe the full text of scholarly literature published by the Journal of Civil Engineering Researchers. Online ISSN: 2538-516X
publisher: Asst. Prof. Morteza Jamshidi
language: en
publication name: Journal of Civil Engineering Researchers
issn: 2538-516X
items: Simplified Unified Model for Flexural Capacity of Ductile HPC Beams with A Low Reinforcement Ratio
items: 2D Equivalent Linear Seismic Site Response Analysis in SBFEM
items: 3D free vibration analysis of nanocomposite beams carbon nanotube reinforced FGM using DQ method
items: Retaining Structures in Slope Stabilization: A Comparative Analysis on Safety and Cost Effectiveness
items: Evaluation of Seismic Response of Multi-Story Structures: A Comparative Study of Buckling Restrained Braces and Viscous Dampers
items: The Effect of Employing a Thermal Insulation Layer in the Building Façade on Energy Consumption (A case study of a residential building in Tehran)
items: Laboratory Study of Weight Loss and Ultrasonic Wave Propagation Velocity in Conventional Concrete Under High Temperature, Along with Validation by SEM and XRD Analysis
items: The Evaluation of the bond strength of heavyweight concrete containing iron pellets
items: Forensic Investigation and Petrographic Analysis of Concrete Apron Distresses; A Case Study in Nashville, Tennessee
items: Investigation of the Effect of High Temperature on the Microstructure of Conventional Concrete Containing High Grade of Portland Cement
items: Viscoelastic damper connected to adjacent structure with seismic isolation system
items: Methodology for Evaluating and Optimizing the Selection of Concrete Structure Demolition Methods Based on Cost, Time, and Quality (Safety)
items: Numerical investigation of the parameters influencing site effects
items: Analysis of Box-Girder Bridge Considering Translational and Rotational Components of Earthquake
items: Comparison of the Mechanical Behaviour of Concrete Reinforced with Industrial Metal Fibres and Recycled Chips in Acidic Environments
items: Numerical Investigation of the Seismic and Axial Performance of Circular Steel Columns Filled with Double-Layer Concrete with Inner Bracing
items: Numerical Investigation of the Impact of Steel Profiles and Embedded Stiffeners in Circular and Square Concrete-Filled Steel Columns under Axial and Lateral Loading
items: Physical and Chemical Surface Modifiers of Carbon Nanotubes on the Mechanical and Physical Properties of Concrete
items: The Effect of Ash from Burning Industrial Waste on the Physical and Mechanical Properties of Ordinary Portland Concrete
items: Exit Strategies for Commercial Complexes in Economic Recession Periods (Case Study: Roya Mall Kish Commercial Complex)
items: Optimizing Slope Stability Assessment Using Hybrid BPSO - SVC with Kernel Function Evaluation
items: Investigating the Effect of Silica Foam on the Mechanical Properties of Concrete Containing Recycled Glass Shards
items: Evaluation of Shape Memory Alloys in the Performance of Reinforced Concrete Frames under Near-Fault Earthquakes
items: Investigating the Effect of Uncertainty in the Optimal Design of a Trapezoidal Channel
items: The Use Of Machine Learning, Computational Methods, And Robotics In Bridge Engineering: A Review
items: Pre-Feasibility Project for the Creation of a High-Traffic Pavers Factory for the Decentralized Autonomous Government of Sigchos Canton
items: Investigating the Mechanical Properties of Natural Fiber-Reinforced Concrete with Kenaf, Jute, and Coconut Fibers
items: Experimental Evaluation of the Impact Resistance of Alkali-Activated Slag Concrete under High Temperature
items: Evaluation of the Impact of Driving Techniques on the Subsoil Stability of Bridge E2 in Manta, Ecuador
items: Examination of the Value of Domestic Component Levels and the Weight of Company Benefits in High-Rise Building Projects

Simplified Unified Model for Flexural Capacity of Ductile HPC Beams with A Low Reinforcement Ratio
type: item
description: There is no specific model to predict the flexural capacity of ultra-high-performance concrete (UHPC) beams with a low reinforcement ratio. Accordingly, a comprehensive experimental database containing 162 datasets was gathered from literature to propose an explicit analytical model containing various critical features, including fiber volume fraction, fiber aspect ratio, fiber strength, water-to-binder () ratio of mixture, and reinforcement ratio. Additionally, a supplementary experimental study involving a large-scale UHPC beam with a very low reinforcement ratio (almost negligible) was conducted to verify the model's performance. The findings revealed that the proposed bending model achieved an IAE of 10.8% and a COV of 1.04, indicating its high accuracy in comparison to a comprehensive experimental dataset comprising 162 large-scale beam tests. Furthermore, the comparison between the experimental results of the tested beam and the proposed model showed a deviation of 4.5%, which supports the effectiveness of the flexural capacity formulation. A parametric statistical analysis was conducted using Minitab software to evaluate the influence of key parameters affecting the roles of fiber and matrix.
subject: Articles
  topic: section
subject: Beam
  topic: keywords
subject: HPC
  topic: keywords
subject: Flexural Capacity
  topic: keywords
subject: Low Reinforcement Ratio
  topic: keywords
subject: Fiber Role
  topic: keywords
creator: Wissam Hamad
creator: Mehdi Dehestani
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 1
ending page: 14
doi: 10.61186/7.3.1

2D Equivalent Linear Seismic Site Response Analysis in SBFEM
type: item
description: Understanding the dynamic behavior of soil layers under seismic loading is pivotal for accurate seismic design and risk assessment. This study conducts a two-dimensional equivalent linear site response analysis using the Scaled Boundary Finite Element Method with Rayleigh damping to enhanced modeling accuracy. SBFEM combines the advantages of finite and boundary element methods, offering high efficiency in simulating wave propagation and stress concentrations in semi-infinite domains. A MATLAB implementation of the method was validated against previous studies, confirming consistent accuracy across various soil profiles and seismic scenarios. The method demonstrates convergence, accuracy, and stability, requiring fewer elements due to boundary-only discretization. This reduces both computational cost and time while accurately modeling the infinite domain condition. The findings highlight the method’s effectiveness for site response analysis under diverse seismic inputs and layered soil configurations, combining the equivalent linear method with SBFEM as a robust and practical tool for dynamic geotechnical applications.
subject: Articles
  topic: section
creator: Morteza Iraniparast
creator: M. Iman Khodakarami
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 52
ending page: 68
doi: 10.61186/7.3.52

3D free vibration analysis of nanocomposite beams carbon nanotube reinforced FGM using DQ method
type: item
description: Beams are always noteworthy as an engineering structure due to their wide application in industry such as bridges, railway tracks, floors and ceilings of buildings and many other cases. Therefore, considering the wide application of these materials in industry, the analysis of this category of structures becomes important in the overall design process of these parts in a structure. With the increasing use of beams in industry and the need to increase their efficiency and ensure their proper functioning, the use of new materials such as functionally graded materials[1]has increased. The use of composite materials, shape memory alloys, piezoelectric materials, etc. and the expansion of the scope of use of these materials has led to increased efforts by researchers to achieve the construction and design of structures and parts with better efficiency and quality. On the other hand, conducting experimental analyses on these materials is associated with problems such as size, price, complexity of the laboratory model, etc., hence the presentation of general theoretical models­. More suitable for ‌In this research, the vibration analysis of a nanobeam is considered. Unidirectional FGM (functional properties along the beam thickness) with carbon nanotubes and a layer‌ Metal and ceramic supports on various types of supports ‌Sometimes. ‌The solutions, including simple, complex, etc., were discussed. The solution method in question was the mixing method, and in line with the thickness of the numerical method, the differential function. It has been DQ based on this, relationships have been extracted regarding how to increase the natural frequency and the lowest natural frequency, as well as the length-to-thickness ratio, natural frequency changes, and dimensionless natural frequency changes in the beam.
subject: Articles
  topic: section
subject: Nanocomposite
  topic: keywords
subject: Carbon nanotubes
  topic: keywords
subject: Method GDQ
  topic: keywords
subject: FGM
  topic: keywords
subject: Eshelby-Mori-Tanaka method
  topic: keywords
creator: Kouros Nekoufar
creator: Shahrzad Farrokhi
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 21
ending page: 37
doi: 10.61186/JCER.7.2.21

Retaining Structures in Slope Stabilization: A Comparative Analysis on Safety and Cost Effectiveness
type: item
description: This study evaluates slope stabilization methods using gravity stone walls, reinforced concrete cantilever walls, and pile shoring systems. Stability and economic performance of these systems were compared through analyses conducted with Plaxis 2D and İstCAD software on a model slope subjected to increasing excavation depths. Results show that gravity stone walls are more economical up to 5 m, while cantilever walls are preferable between 5–9 m. Beyond 9 m, both methods become inadequate, and pile shoring systems provide the most effective solution. Each method's advantages and limitations were assessed based on field applicability, cost, and stability.
subject: Articles
  topic: section
subject: Slope Stabilization
  topic: keywords
subject: Retaining Structures
  topic: keywords
subject: Cost-Effectiveness Analysis
  topic: keywords
subject: PLAXIS 2D
  topic: keywords
subject: Natural Disaster
  topic: keywords
creator: Selman KAHRAMAN
creator: İnan KESKİN
creator: Taner Gürbüz
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 15
ending page: 28
doi: 10.61186/7.3.15

Evaluation of Seismic Response of Multi-Story Structures: A Comparative Study of Buckling Restrained Braces and Viscous Dampers
type: item
description: In buckling restrained bracing systems, earthquake-induced elongation problems are solved, and BRB-equipped structures have a much more effective performance in energy absorption in addition to high lateral stiffness. Systems equipped with viscous dampers (VD) also have great potential to absorb seismic energy. To assess the vulnerability of structures equipped with buckling restrained bracing (BRB) and VD systems, three structures (6-, 10- and 15-story) were chosen as representatives of mid-rise, high-rise and super high-rise buildings and modeled in four states of moment-resisting frame (MRF): the frame equipped with VD, the frame equipped with BRB, and the frame equipped with BRB and viscous damper simultaneously (BRB+VD) using OpenSees-2.4.6 software under incremental dynamic analysis (IDA). Seven seismic records were applied, and the maximum inter-story drift response and fragility curves were determined. The results indicated that although the simultaneous application of BRB+VD causes a significant decline in the response of all structures, each of these two systems is able to provide structural safety at various levels in mid-rise structures. It is required to apply both systems simultaneously to provide safety for slight and moderate levels of damage in high-rise buildings, while super high-rise buildings are vulnerable to whole levels of damage, and their structural safety involves the simultaneous use of both systems.
subject: Articles
  topic: section
subject: Viscous Damper
  topic: keywords
subject: Buckling Restrained Brace
  topic: keywords
subject: Incremental Dynamic Analysis
  topic: keywords
subject: Seismic Response
  topic: keywords
subject: Multi-Story Structures
  topic: keywords
creator: Mansour Bagheri
creator: Seyed Abbas Hosseini
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 57
ending page: 67
doi: 10.61186/JCER.7.2.57

The Effect of Employing a Thermal Insulation Layer in the Building Façade on Energy Consumption (A case study of a residential building in Tehran)
type: item
description: Although currently, a large part of the existing buildings are considered inefficient in terms of energy, the ability to save energy consumption up to 80% has been proven in residential and commercial buildings. This study aims to calculate energy consumption during the operational phase caused by various scenarios of thermal insulation combinations in a building's exterior shell. The simulation was conducted using Design Builder software, with a five-story residential building in Tehran as the case study. Initially, the building was modeled in Design Builder, and keeping all other characteristics constant, ten scenarios were defined: nine using different types of thermal insulation and one without insulation. The software outputs for each scenario were analyzed. Results showed that the best thermal insulation layer is polyurethane foam, which saves 1070.15 kilowatt-hours of energy during one year of the building's operation. This article can help designers and construction engineers optimize the energy consumption of buildings by deciding the right materials. © 2017 Journals-Researchers. All rights reserved
subject: Articles
  topic: section
subject: Energy Consumption
  topic: keywords
subject: Design Builder Software
  topic: keywords
subject: Façade
  topic: keywords
subject: Thermal Insulation
  topic: keywords
subject: Residential Building
  topic: keywords
creator: Amir Sina darabi
creator: Mehdi Ravanshadnia
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 29
ending page: 39
doi: 10.61186/7.3.29

Laboratory Study of Weight Loss and Ultrasonic Wave Propagation Velocity in Conventional Concrete Under High Temperature, Along with Validation by SEM and XRD Analysis
type: item
description: In this laboratory study, a mixed concrete design containing Portland cement type 2 with a grade of 500 kg/m3 was made. Weight loss and ultrasonic pulse velocity (UPV) tests were performed on concrete samples at a curing age of 90 days at room temperature (21 ℃) and under a temperature of 600 ℃. In order to further investigate and verify the results, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were performed on concrete samples at a curing age of 90 days. The results of the tests in this study were evaluated together and compared and analysed with the results of other researchers. Applying high heat to concrete samples caused a decrease in results. In this regard, in the weight loss test of concrete samples, the weight of the concrete sample decreased from 2378 to 2225 grams, which was a decrease of 72.6%, and in the UPV test, the speed of ultrasonic waves decreased from 6179 to 3411 m/s, which was a decrease of 79.44%. At the end of this study, the results of SEM and XRD analysis at room temperature and under high temperature, while coordinating with each other, overlapped with the results of the weight loss test and the ultrasonic wave velocity test in concrete samples.
subject: Articles
  topic: section
subject: Ultrasonic Pulse Velocity (UPV)
  topic: keywords
subject: Temperature
  topic: keywords
subject: Scanning Electron Microscopy (SEM)
  topic: keywords
subject: X-ray Diffraction Spectroscopy (XRD)
  topic: keywords
subject: Conventional Concrete
  topic: keywords
creator: Mohammadhossein Mansourghanaei
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 68
ending page: 75
doi: 10.61186/JCER.7.2.68

The Evaluation of the bond strength of heavyweight concrete containing iron pellets
type: item
description: Heavyweight concrete incorporating iron aggregates is widely utilized as a radiation-shielding material in environments with harmful radiation due to its high density. Although this material is also employed as a structural component, certain mechanical properties, such as the bond strength between concrete and reinforcing steel bars, remain insufficiently studied. This paper investigates the bond strength of concrete containing varying percentages of iron pellets and its interaction with steel reinforcement. For this study, 25%, 75%, and 100% of the concrete aggregate was replaced with iron pellets, ensuring an appropriate grain size distribution. After curing under standard conditions, the specimens were subjected to direct pull-out tests. The results indicate that, except for the sample with 25% iron pellets, the inclusion of iron pellets slightly reduces compressive strength but enhances bond strength across all samples. Notably, adding 25% iron pellets combined with 5% micro silica in heavyweight concrete significantly improves compressive strength by 20% and bond strength by 43%.
subject: Articles
  topic: section
subject: Heavyweight concrete
  topic: keywords
subject: bond strength
  topic: keywords
subject: iron pellets
  topic: keywords
subject: pull out test
  topic: keywords
creator: Seyed Abbas Hosseini
creator: Mansour Bagheri
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 69
ending page: 75
doi: 10.61186/7.3.69

Forensic Investigation and Petrographic Analysis of Concrete Apron Distresses; A Case Study in Nashville, Tennessee
type: item
description: This study presents a forensic investigation into pavement distress in a concrete apron located in Nashville, Tennessee. The investigation involved detailed engineering observations and a comprehensive pavement condition survey in accordance with ASTM D5340. To identify the underlying causes of deterioration, petrographic examinations were conducted on three concrete cores extracted from the apron, following ASTM C856 guidelines. The analysis revealed consistent aggregate distribution, primarily composed of micritic limestone and quartz-based sand, with air content (total of entrapped and purposefully entrained air) ranging from 3.9% to 5.2% and air void spacing factors exceeding American Concrete Institute (ACI) recommendations for freeze-thaw durability. No carbonation was detected in the cores, but moderate to abundant ettringite, calcium hydroxide, and alkali-silica gel resulting from Alkali-Silica Gel (ASG) were observed lining voids and fractures. The findings indicate that Alkali-Silica Reaction (ASR)-related damage, exacerbated by cyclic wetting and drying, is a primary contributor to the pavement deterioration. Freeze-thaw damage due to inadequate air entrainment was also identified as a contributing factor. Based on the results, recommendations for improving the long-term performance and durability of the concrete apron include using low-alkali cement, selecting better-graded and less reactive aggregates, increasing the percentage of purposefully entrained air to reduce air void spacing and improve freeze-thaw durability, and incorporating supplementary cementitious materials (SCMs) to reduce alkali availability and enhance ASR resistance. We note the use of lithium nitrate has also been proven to mitigate ASR in new concrete. However, the mechanism of mitigation is not fully understood, and the relatively high cost and limited availability of lithium introduces challenges for this alternative. This study underscores the importance of petrographic examinat…
subject: Articles
  topic: section
subject: Concrete Apron
  topic: keywords
subject: Petrographic Examination
  topic: keywords
subject: Freeze-thaw Damage
  topic: keywords
subject: Alkali-Silica Reaction (ASR)
  topic: keywords
subject: Petrographic Analysis
  topic: keywords
creator: Hossein Alimohammadi
creator: David Been
creator: James Duncan
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 40
ending page: 51
doi: 10.61186/7.3.40

Investigation of the Effect of High Temperature on the Microstructure of Conventional Concrete Containing High Grade of Portland Cement
type: item
description: In this laboratory study, a mixed concrete design containing 500 kg/m3 Portland cement was prepared, and elastic modulus testing, X-ray diffraction (XRD) analysis, and scanning electron microscope (SEM) image analysis were performed on concrete samples at 21 and 600 °C after a curing age of 90 days to investigate and evaluate the microstructure of concrete at room temperature and under high temperature. The results of the tests indicate that high temperature causes a decrease in the results, so that the elastic modulus of concrete experienced a decrease of 71.63% from 73.33 GPa at 21°C to 24.12 GPa at 600 °C, and in the XRD analysis, a decrease in the height of the peaks of hydrated elements is observed. The low peak height of calcium hydroxide in the XRD spectrum indicates a proper polymerization process in conventional concrete. In SEM analysis, at a temperature of 21 °C, due to the completion of a large part of the polymerization process, the tree structure, pores and unhydrated particles are seen in their minimum amount, but after applying a temperature of 600 °C to the concrete sample, with damage to the microstructure of the concrete and the hydrated calcium aluminum sulfate (C-A-S-H) and hydrated calcium silicate (C-S-H) gels, an increase in the tree structure, pores and cracks is evident in the concrete sample.
subject: Articles
  topic: section
subject: Ordinary Concrete
  topic: keywords
subject: Heat
  topic: keywords
subject: Modulus of Elasticity
  topic: keywords
subject: Hydrated Calcium Silicate (C-S-H)
  topic: keywords
subject: Calcium Hydroxide (Ca(OH)2)
  topic: keywords
creator: Mohammadhossein Mansourghanaei
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 62
ending page: 70
doi: 10.61186/JCER.7.1.62

Viscoelastic damper connected to adjacent structure with seismic isolation system
type: item
description: Base isolation solutions are efficient alternatives for seismic protection of buildings and for enhancing resilient capacity. Currently, seismic isolation is focused principally on the critical infrastructure of public health, transportation, education, etc. The seismic response of multi storied base-isolated structure to various types of isolation systems connected using viscoelastic dampers to the adjacent dissimilar base isolated or fixed base structure is investigated. The multi- storied structures are modelled as a shear type structure with lateral degree of freedom at each floor, which are connected at different floor levels by viscoelastic dampers. The variation of top floor absolute acceleration of both the buildings and bearing displacement under different real earthquake ground motions is computed to study the behavior and effectiveness of resulting connected system. It is concluded that connecting the two adjacent base isolated buildings with the viscoelastic dampers is useful in controlling large hearing displacements in the base isolated structures thereby eliminating the isolator damages arising due to instar billet at these large displacements or pounding with adjacent ground structures during earthquakes. The viscoelastic damper connection between adjacent structures is found to be most effective when the adjacent base-isolated and fixed base buildings are competed. Such scheme is hence useful in upgrading the seismic performance of existing fixed base structures adjacent to a base isolated structure.
subject: Articles
  topic: section
subject: Earthquake
  topic: keywords
subject: Elastomeric Bearing
  topic: keywords
subject: Isolation System
  topic: keywords
subject: Sliding System
  topic: keywords
subject: Retrofit
  topic: keywords
subject: Viscoelastic Damper
  topic: keywords
creator: Hosein Sarkoyeh
creator: Mohammad Ali Hajarizadeh
creator: Saeed Alaie
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-09-01
publication date: 2025-09-01
starting page: 76
ending page: 86
doi: 10.61186/7.3.76

Methodology for Evaluating and Optimizing the Selection of Concrete Structure Demolition Methods Based on Cost, Time, and Quality (Safety)
type: item
description: Nowadays, with the aging of old structures and the advancement of construction technologies, demolition projects for outdated structures have seen significant growth. this paper focuses on demolition methods in detail. In a case study conducted in Iran, this paper evaluates the demolition methods for a concrete silo using the Analytical Hierarchy Process (AHP) to select the optimal method based on cost, time, and quality (safety). Time evaluation is performed using MSP software, while cost assessment for each method is estimated based on resources allocated to the activities within the Work Breakdown Structure (WBS) of each approach. Safety evaluation employs a combined application of the AHP and Data Envelopment Analysis (DEA) methods. Required data for constructing pairwise comparison matrices were gathered through questionnaires completed by domain experts. The results reveal that the demolition method using concrete wire saws scores the highest among the methods evaluated. Furthermore, based on modeling results in Sap2000 software, it is shown that single-stage toppling of the silo by removing its main columns is not feasible. Subsequently, the site layout design and lifting plan calculations for the selected method were carried out. All outcomes were compared with real-life execution, and the project's success demonstrated the effectiveness of the chosen method due to comprehensive consideration of all construction management aspects of a demolition project. This paper is written with the aim of simplifying technical concepts in the management of demolition methods.
subject: Articles
  topic: section
subject: Demolish Methods
  topic: keywords
subject: Concrete silo
  topic: keywords
subject: Safety
  topic: keywords
subject: Cost management
  topic: keywords
subject: Time management
  topic: keywords
subject: Concrete wire cutting
  topic: keywords
creator: Mohsen Asgharinia
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 76
ending page: 98
doi: 10.61186/JCER.7.2.76

Numerical investigation of the parameters influencing site effects
type: item
description: One of the most important topics in geotechnical earthquake engineering is the examination of site effects. This phenomenon alters the characteristics of seismic waves, leading to amplified vibrations and consequently increasing financial and human losses. Today, various methods exist for assessing site effects, among which numerical methods are among the most widely used due to their reasonable costs, reduced time, and high accuracy. In this research, a problem was subjected to the effects of three different earthquakes (Bam, Naghan, and Tabas). By comparing the results of each earthquake, the site effects were identified in terms of changes in peak gorund acceleration (PGA), frequency content, and shaking duration. Additionally, to investigate the effects of soil layering, the position of the layers was altered, revealing significant impacts of layer changes on seismic wave characteristics. Finally, to assess the effect of earthquake source type, one earthquake was evaluated at two different stations (near/far field). Results indicated a significant influence of the epicentral distance on the amplification and attenuation of waves.
subject: Articles
  topic: section
subject: Site Effect
  topic: keywords
subject: PGA
  topic: keywords
subject: Frequency Content
  topic: keywords
subject: Soil Layering
  topic: keywords
subject: Epicentral Distance
  topic: keywords
creator: Sadegh Rezaei
creator: Majid Moradi
creator: Ali Hasanzadeh
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-08-25
publication date: 2025-08-25
starting page: 10
ending page: 20
doi: 10.61186/JCER.7.2.10

Analysis of Box-Girder Bridge Considering Translational and Rotational Components of Earthquake
type: item
description: Due to the importance of bridges as vital arteries and the huge investment of countries in building bridges, the need for more accurate seismic analysis of bridges to better understand their structural behavior is inevitable. Like many structures, the effect of the rotational components of the earthquake on bridges has been less noticed by researchers and designers. This research has evaluated the effect of the rotational components of the earthquake to better understand the seismic behavior of bridge. For this purpose, in addition to three translational components, the rotational components of the earthquake, including two rocking components and one torsional component, have been considered in the three-dimensional seismic analysis of box-girder concrete bridges. By creating the rotational component of the earthquake by the Hong-Nan Li method, three box-girder bridges with pier heights of 12, 30, and 45 meters were subjected to the combined effect of six translational and rotational components, as well as three translational components were separately subjected to under a far-field earthquake with different soil and shear wave velocity. The results of the analysis show that the effect of the earthquake's rotational components on the response of stresses and displacement, depending on the type of earthquake and the characteristics of the bridge structure, can be particularly important.
subject: Articles
  topic: section
subject: Box-girder bridge
  topic: keywords
subject: Rotational component of the earthquake
  topic: keywords
subject: Linear dynamic analysis
  topic: keywords
subject: Far field earthquake
  topic: keywords
subject: Concrete bridge
  topic: keywords
creator: Mohamadreza Abdollahi-Kakroudi
creator: Morteza Hosseinali Beygi
creator: Leila Kalani Sarokolayi
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 55
ending page: 61
doi: 10.61186/JCER.7.1.55

Comparison of the Mechanical Behaviour of Concrete Reinforced with Industrial Metal Fibres and Recycled Chips in Acidic Environments
type: item
description: In recent years, most of the laboratory research on the comparison of the mechanical behaviour of reinforced concrete containing industrial metal fibres and recycled chips has been carried out abroad, and it is necessary to carry out special studies on reinforced concrete with domestic materials, so that we can produce a recycled reinforced concrete from metal waste and recycled chips that is resistant to acid attack and can be used in the construction industry. First we prepare the materials and fibres required for the test, then we design an optimal mixing plan in which industrial metal fibres and recycled chips are used in different percentages. The recycled chips are added to the concrete mix in such a way that the amount of chips we add reduces the amount of fine-grained sand, and the chips replace a small percentage of the sand. Concrete samples are then taken according to the mix design and tested after curing at a specified age. We compare concrete samples containing industrial metal fibres and recycled chips after exposure to an acidic environment with a concrete sample without fibres exposed to an acidic environment to understand how much the presence of fibres and chips in the concrete mix has increased the resistance of the concrete to acid.
subject: Articles
  topic: section
subject: Mechanical behaviour
  topic: keywords
subject: Reinforced concrete
  topic: keywords
subject: Industrial metal fibres
  topic: keywords
subject: Recycled chips
  topic: keywords
subject: Acidic environment
  topic: keywords
creator: Hadi Faghihmaleki
creator: Mehrshad Jafariyan Jolodar
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 48
ending page: 54
doi: 10.61186/JCER.7.1.48

Numerical Investigation of the Seismic and Axial Performance of Circular Steel Columns Filled with Double-Layer Concrete with Inner Bracing
type: item
description: Concrete-filled double-shell circular steel columns consist of two concentric steel tubes with the space between them filled with concrete. These columns are a suitable option for high-rise construction due to their lower weight and also allow the passage of cables and utilities. In this research, modelling was carried out in Abaqus software and parametric analysis was performed based on variables such as the shape and dimensions of the stiffeners. The results show that concrete-filled double-shell columns perform better against axial and seismic loads than columns without concrete. The total and square stiffeners give the best performance, but it is not possible to increase their number due to space constraints. Trapezoidal stiffeners are also effective in improving axial and lateral performance, but result in a reduction in ductility. Circular stiffeners have the greatest reduction in ductility and their use is limited. In general, the choice of stiffener type has a significant effect on the performance of double shell columns.
subject: Articles
  topic: section
subject: Seismic performance
  topic: keywords
subject: Axial performance
  topic: keywords
subject: Double shell steel column
  topic: keywords
subject: Internal stiffener
  topic: keywords
subject: Finite element analysis
  topic: keywords
creator: Hadi Faghihmaleki
creator: Seyedeh Sara Farahpour
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 38
ending page: 56
doi: 10.61186/JCER.7.2.38

Numerical Investigation of the Impact of Steel Profiles and Embedded Stiffeners in Circular and Square Concrete-Filled Steel Columns under Axial and Lateral Loading
type: item
description: Concrete-filled steel tube (CFST) columns are widely used in high-rise buildings around the world due to their numerous structural advantages, including high load-bearing capacity, favorable inherent ductility, substantial energy absorption capabilities, and the elimination of the need for formwork. However, in Iran, these structures have not yet been widely implemented in practice, highlighting the need for further research in this area. Additionally, challenges such as buckling and local delamination between the concrete and steel under loading remain key issues for these columns. Research indicates that circular CFST columns provide the strongest confinement for concrete, whereas square CFST columns exhibit higher local buckling under loading. Furthermore, embedded steel profiles significantly enhance the overall performance of these columns. In this study, a finite element model of CFST columns with embedded cruciform profiles is validated using Abaqus software and subsequently analyzed parametrically. The objective of this study is to evaluate the seismic and axial performance of the "primary column cross-sections" and the "embedded steel profiles" with equivalent areas. The findings of this research demonstrate that filling the internal space of steel columns with concrete substantially improves axial and lateral performance, although it slightly reduces lateral ductility. Additionally, stress analysis reveals that the type of embedded steel profile directly influences the enhancement of load-bearing capacity and lateral performance. Results also show that square CFST columns outperform their circular counterparts in terms of axial strength and stiffness, though they exhibit lower axial ductility. Moreover, the results indicate that embedded profiles with concentrated mass at the center (central profiles) significantly enhance axial performance, whereas those with mass concentrated along the perimeter (peripheral profiles) exhibit the lowest axial performance …
subject: Articles
  topic: section
subject: Numerical development
  topic: keywords
subject: Concrete-filled steel columns
  topic: keywords
subject: Axial performance
  topic: keywords
subject: Lateral performance
  topic: keywords
subject: Steel profiles embedded in concrete
  topic: keywords
creator: Mohammadreza Oliaei
creator: Mohammad Amin Hamidi Moghadam
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 22
ending page: 33
doi: 10.61186/JCER.7.1.22

Physical and Chemical Surface Modifiers of Carbon Nanotubes on the Mechanical and Physical Properties of Concrete
type: item
description: This study utilizes nanofilament-based nanotechnology, such as carbon nanotubes (CNTs), to improve the mechanical characteristics of concrete as a building material. One of the important and effective factors in adding carbon nanotubes to cement composites is their proper dispersion in the mixture. Therefore, in this research, different methods of dispersing carbon nanotubes in cement mortar have been investigated. They were first functionalized through covalent bonding to prevent carbon nanotubes from accumulating in the water. To achieve the appropriate distribution of carbon nanotubes in water and maintain the stability of their dispersion, different surfactants including Polycarboxylate (PCE), Sodium dodecyl sulfate (SDS), Cetyltrimethylammonium bromide (CTAB), Polyethylene glycol (PEG) were employed. At that point, utilizing visual perception and UV test, PCE/PEG surfactant was presented as a reasonable surfactant for the scattering of carbon nanotubes. Once the most suitable dispersal technique was identified, the impact of incorporating multi-walled carbon nanotubes into concrete was investigated with varying weight proportions. The study revealed that even at low concentrations (0.015%, 0.030%, and 0.045%) relative to the cement weight, the inclusion of carbon nanotubes decreased the porosity of the concrete nanocomposite, resulting in a denser and more compact composite. As a result, it increases the concrete samples' compressive, tensile, and bending strength.
subject: Articles
  topic: section
subject: Dispersion method
  topic: keywords
subject: Carbon nanotubes
  topic: keywords
subject: mechanical properties
  topic: keywords
subject: Surfactant
  topic: keywords
subject: Concrete
  topic: keywords
creator: Mahsa Zarehparvar-Shoja
creator: Rasoul Shadnia
creator: Amin Amin Kazemi Beydokhti
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 34
ending page: 47
doi: 10.61186/JCER.7.1.34

The Effect of Ash from Burning Industrial Waste on the Physical and Mechanical Properties of Ordinary Portland Concrete
type: item
description: One of the ways to dispose of urban waste is to burn it in incinerators. In this research, it was tried to use the ash obtained from the waste incineration plant of Saveh city (Iran) as a substitute for part of the consumed cement in concrete production. To achieve this goal, the effects of waste ash on compressive strength, abrasion resistance, flexural strength, water absorption and unit weight of concrete were investigated using experimental methods. The concrete used was made with a compressive strength of 30 MPa. The results obtained from the laboratory tests showed that the addition of waste ash as a partial substitute of the cement in the amounts of 10, 20, and 30% in the tested concrete samples caused to decrease the compressive strength by 21, 42, and 49%, the flexural strength by 5, 15 and 22%, and the unit weight of concrete by 3, 5 and 7% respectively, and to increase the water absorption by 3, 6 and 12% respectively, compared to the control sample. Also, there is a slight decrease in the abrasion resistance of concrete including waste ash. However, the obtained strengths were still acceptable for the construction of concretes that require less strength. On the other hand, the use of this ash as a part of the cement used in concrete not only removes the concern of waste incineration plants to dispose of this pollution, but also reduces the consumption of cement and consequently reduces greenhouse gases caused by cement production.
subject: Articles
  topic: section
subject: Waste Ash
  topic: keywords
subject: Compressive Strength
  topic: keywords
subject: Flexural Strength
  topic: keywords
subject: Abrasion Resistance
  topic: keywords
subject: Ordinary Concrete
  topic: keywords
creator: Mahdi Jalali
creator: Rasoul Shadnia
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-06-01
publication date: 2025-06-01
starting page: 1
ending page: 9
doi: 10.61186/JCER.7.2.1

Exit Strategies for Commercial Complexes in Economic Recession Periods (Case Study: Roya Mall Kish Commercial Complex)
type: item
description: The primary aim of this article is the identification and selection of the optimal strategy for the exit of a significant capital volume invested in the construction of commercial centers in the face of investment risk in the construction of commercial complexes, along with influential factors in challenging economic conditions such as exchange rate fluctuations, transregional power sanctions, stagflation, excessive supply and growth in commercial complex construction in the country, etc., specifically focused on the Royal Mall Kish project. Indeed, the effectiveness and reliability of formulating and selecting exit strategies based on successful implementation and the creation of a sustainable economic cycle for a commercial complex are deemed essential and prerequisite. The research method employed is qualitative. In the qualitative section of this study, through interviews, we identified the relevant factors affecting exit strategies, considering the current conditions and business environment to achieve ultimate goals. These factors are ultimately categorized into three dimensions: structural, behavioral, and contextual. The qualitative sample population includes active experts in this project. At theoretical saturation point, 8 experts were identified as participants in the research. Ultimately, 43 influential components on strategy selection and 5 exit strategies were identified in this project that can be determined as suitable strategies in the appropriate situation for decision-making regarding exit.
subject: Articles
  topic: section
subject: Exit Strategy
  topic: keywords
subject: Content Analysis
  topic: keywords
subject: Economic Recession Period
  topic: keywords
subject: Commercial Centers
  topic: keywords
subject: Structural Dimensions
  topic: keywords
creator: Majid Motiolhagh
creator: Kamran Yeganegi
creator: Maryam Ebrahimi
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 12
ending page: 21
doi: 10.61186/JCER.7.1.12

Optimizing Slope Stability Assessment Using Hybrid BPSO - SVC with Kernel Function Evaluation
type: item
description: The complex nature of slope engineering presents considerable challenges in accurately predicting slope stability using traditional methodologies. Due to the serious implications that can arise from slope failures, it is crucial to implement the most effective techniques for assessing slope stability. This study investigates a hybrid approach that integrates BPSO with SVC to enhance predictive accuracy in slope stability assessment. The methodology employs BPSO to optimize the selection of features that are critical to the prediction process. Additionally, grid search technique is utilized for fine-tuning the hyperparameters of the SVC. The research evaluates the performance of three SVC kernel functions: linear, polynomial and rbf. For the predictive analysis, six features identified as potentially influential were selected: height of the slope (H), pore water ratio (ru), unit weight of the soil (Ƴ), cohesion of the soil (c), slope angle (β), and angle of internal friction (ɸ). To enhance the generalization capability of the classification models, a 5-fold cross-validation (CV) approach was implemented. The effectiveness of the models was evaluated using various metrics, including the area under the curve (AUC) and overall accuracy of the predictions. The findings of the study indicate that the hybrid approach, particularly the SVC employing the rbf kernel, significantly outperformed the other models in terms of prediction accuracy, achieving an AUC of 0.735 and an accuracy rate of 0.725. This underscores the potential of the proposed hybrid method as a valuable tool for accurately predicting slope stability and mitigating risks associated with slope failures in engineering applications.
subject: Articles
  topic: section
subject: support vector classifier
  topic: keywords
subject: Machine Learning
  topic: keywords
subject: slope stability
  topic: keywords
subject: binary particle swarm optimization
  topic: keywords
subject: grid search
  topic: keywords
creator: Saurabh Kumar Anuragi
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-03-01
publication date: 2025-03-01
starting page: 1
ending page: 11
doi: 10.61186/JCER.7.1.1

Investigating the Effect of Silica Foam on the Mechanical Properties of Concrete Containing Recycled Glass Shards
type: item
description: Recycled glass waste is one of the most attractive waste materials that can be used to create a concrete mix.Therefore, researchers focus on the production of concrete using recycled glass as an abrasive or as a pozzolanic material, but the use of recycled glass in the form of coarser particles to replace sand in concrete increases the alkali-silica reaction and this causes Unfavorable performance in the mechanical properties of concrete.To prevent this, microsilica is used to improve the strength and mechanical properties of concrete.In this research, after building the control mixing design, recycled glass was replaced with sand and silica foam as microsilica in four designs with a fixed ratio of 5% by weight of cement.The compressive strength test was performed at the ages of 7 and 28 days, and three samples were taken in each test, and a total of 24 cubic samples were tested.Tensile test, like compressive strength test, were tested at the ages of 7 and 28 days, which included two cylindrical samples in each test, and a total of 16 cylindrical samples were tested.The presence of silica foam in concrete causes adhesion and reduction of slump fluidity, and the highest slump fluidity was observed at 5% ratio.The result of testing the compressive strength and tensile strength of the concrete containing glass shards and silica foam had decreased in quality compared to the control mixing plan, which shows the unfavorable performance of coarse glass particles in the concrete structure.
subject: Articles
  topic: section
subject: Silica foam
  topic: keywords
subject: Shards of glass
  topic: keywords
subject: Durability
  topic: keywords
subject: Concrete with recycled materials
  topic: keywords
subject: Cmpressive and tensile strength
  topic: keywords
creator: Hadi Faghihmaleki
creator: Reza Abbasghorbani
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 22
ending page: 31
doi: 10.61186/JCER.6.4.22

Evaluation of Shape Memory Alloys in the Performance of Reinforced Concrete Frames under Near-Fault Earthquakes
type: item
description: This study investigates and compares the performance of reinforced concrete buildings containing SMA bars and steel bars as longitudinal reinforcement of column.The use of this type of material is to reduce permanent deformation in the structure due to the reversible properties of these materials.First, a laboratory specimen of a reinforced concrete column with shape memory alloy bars was modeled in the OPENSEES software and the modeling method was validated.Then, 3- and 5-story concrete frames, in two states, reinforced with steel bars and SMA bars, under nonlinear static and nonlinear time history analyses with near-fault records were analyzed.The results of the time history analyses showed that, although the use of SMA bars significantly reduces the residual deformation of the structure, it does not show a significant effect on reducing the maximum displacement of the structure.The maximum rotational deformation of columns in frames with SMA bars is greater than of frames with steel bars.However, SMA bars have greatly reduced the permanent rotational deformation of columns and reduced it to zero.The maximum drift of floors in frames with SMA bars increases slightly.The permanent drift of the structure in frames with SMA bars is significantly reduced.
subject: Articles
  topic: section
subject: Concrete Frames
  topic: keywords
subject: Nonlinear Static Analysis
  topic: keywords
subject: Time History Dynamic Analysis
  topic: keywords
subject: Shape Memory Alloy
  topic: keywords
subject: Seismic Performance
  topic: keywords
creator: Seyed Ahmad Mazloum
creator: mahdi mashhadiyan
creator: Elham Rajabpour
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 1
ending page: 8
doi: 10.61186/JCER.6.4.1

Investigating the Effect of Uncertainty in the Optimal Design of a Trapezoidal Channel
type: item
description: In this article, the optimal shape of the compound trapezoidal cross-section is presented by considering the deterministic constraints and the probabilistic constraint of channel flooding as uncertainty with the SPSA algorithm and with three discharge of 10, 50, and 120 (m^3/s). The objective function is to minimize the cost of excavation and lining, the design variables of depth and width of the canal bottom, side slopes and constraints include uniform flow, maximum and minimum velocity, water surface width and the overtopping probability. The values of the freeboard and the slope of the channel bed are fixed and equal to 0.5 meters and 0.0028, respectively. The results show that with the increase in overtopping Probability, the flow depth increases, but the side slopes, velocity and Froud number decrease. The cost of construction and the width of the bed, initially decreases with the increase of the overtopping probability, and at a certain value, the probability reaches its minimum value, and then with the increase of the overtopping probability, the cost of construction and bed width increases.
subject: Articles
  topic: section
subject: Open channels
  topic: keywords
subject: Optimal design
  topic: keywords
subject: SPSA algorithm
  topic: keywords
subject: Overtopping probability
  topic: keywords
subject: Uncertainty
  topic: keywords
creator: Somayyeh Pourbakhshian
creator: Fatemeh Abdolrasuli
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 40
ending page: 51
doi: 10.61186/JCER.6.4.40

The Use Of Machine Learning, Computational Methods, And Robotics In Bridge Engineering: A Review
type: item
description: In this review paper, the applications of machine learning, computational methods, and robotics to bridge design are considered to help improve structure integrity and resilience. It describes a variety of computational methods, including finite element analysis (FEA) and computational fluid dynamics (CFD), that have been used to calculate failure modes and evaluate the dynamic behavior of bridge structures in extreme conditions, such as earthquakes and floods. It also highlights robotics’ potential to streamline inspection techniques, showing new robotic systems for effective bridge monitoring. Additionally, it points out issues related to data shortages and implementation difficulty and presents future research priorities, such as the need for powerful machine learning algorithms and the use of Internet of Things (IoT) solutions for real-time monitoring. In summary, the paper highlights the life-changing impact of these technologies on the safety and reliability of bridge systems.
subject: Articles
  topic: section
subject: Machine Learning
  topic: keywords
subject: Computational Methods
  topic: keywords
subject: Robotics
  topic: keywords
subject: Structural Integrity
  topic: keywords
subject: Resilience
  topic: keywords
creator: Parankush Koul
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 9
ending page: 21
doi: 10.61186/JCER.6.4.9

Pre-Feasibility Project for the Creation of a High-Traffic Pavers Factory for the Decentralized Autonomous Government of Sigchos Canton
type: item
description: The objective of this study is to determine the technical, legal, and economic feasibility of establishing a heavy-duty paver block factory for the Municipal Decentralized Autonomous Government of Sigchos Canton. The methodology used included a non-experimental research approach, with an explanatory, descriptive, and correlational design. Surveys were conducted with the legal representatives of the parish councils to gather primary information, while secondary information was obtained through bibliographic and documentary review. The results from the market study reveal significant demand and acceptance from the parish representatives toward the production of vehicular pavers, supporting the need to improve local road infrastructure and economic development. A market opportunity was identified both in government projects and private initiatives, with an estimated daily demand of 2,800 paver units. As for the technical study, efficient production processes were designed, with rigorous quality control measures and an annual production capacity of 2,880,000 pavers. The administrative-legal analysis reflects a comprehensive and proactive approach to meeting legal and regulatory requirements, including the decision to establish a Corporation (S.A.) and obtaining the necessary permits for the factory’s operation. Finally, the financial study results indicate that the project is economically viable, with a positive Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PBP), average profitability (AP), and Benefit-Cost Ratio (BCR), supporting the project's feasibility.
subject: Articles
  topic: section
subject: Economic Feasibility
  topic: keywords
subject: Paver block factory
  topic: keywords
subject: Municipal Decentralized
  topic: keywords
subject: Autonomous Government of Sigchos Canton
  topic: keywords
subject: Technical legal
  topic: keywords
creator: Mohammadfarid Alvansazyazdi
creator: Gabriel Alejandro Molina Gomez
creator: Luis Miguel Leon Torres
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 52
ending page: 59
doi: 10.61186/JCER.6.4.52

Investigating the Mechanical Properties of Natural Fiber-Reinforced Concrete with Kenaf, Jute, and Coconut Fibers
type: item
description: This study investigates the mechanical properties of natural fiber-reinforced concrete (FRC) through the addition of natural fibers such as kenaf (KFRC), jute (JFRC), and coconut (CFRC). The evaluation focused on key properties including compressive strength, split tensile strength, and flexural strength. Fiber combinations were introduced in a fiber volume fraction of 0.5%, with fiber lengths standardized at 20 mm. A water-to-binder ratio of 0.44 was maintained for all mixes. Six specimens were tested for each parameter after a curing period of 28 days. The objective of this research was to assess the potential of natural fibers like kenaf, jute, and coconut for developing sustainable FRC while maintaining or improving its mechanical properties. Results demonstrated that the inclusion of natural fibers at the specified length and concentration positively influenced post-cracking flexural performance and splitting tensile strength. Among the tested combinations, FRC reinforced with jute fibers (JFRC) exhibited superior performance compared to other fiber combinations.
subject: Articles
  topic: section
subject: Natural fiber-reinforced concrete
  topic: keywords
subject: Kenaf fibers
  topic: keywords
subject: Jute fibers
  topic: keywords
subject: Coconut fibers
  topic: keywords
subject: Sustainable concrete
  topic: keywords
creator: Sanaz Kameli
creator: Amin H Shahi
creator: Amir Mahboob
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-12-01
publication date: 2024-12-01
starting page: 32
ending page: 39
doi: 10.61186/JCER.6.4.32

Experimental Evaluation of the Impact Resistance of Alkali-Activated Slag Concrete under High Temperature
type: item
description: In recent years, the use of activated alkaline slag concretes (AASC), has had a wide perspective in civil engineering science due to its many environmental benefits (due to the reduction of the emission of CO2 gas in the air) and high resistance to impact loads. is in this article, a mixed design of ordinary portland cement concrete (OPCC) containing 500 kg/m3 of portland cement as a control concrete and a mixed design of AASC containing granulated blast furnace slag (GBFS) was made, and the impact resistance of the concrete was tested under the weight-drop impact test (WDIT). It was evaluated at temperatures of 21, 300 and 600 ℃ at the age of 90 days. The obtained results indicate that the increase in temperature has caused a drop in the results of the WDIT, so that in OPCC, the energy absorbed and the flexibility index of concrete samples at a temperature of 600 ℃ drop by 76.92% and it obtained 86.95% improvement compared to 21 ℃ temperature, while in active alkali concrete, these figures brought 66.66 and 14.28% drop in results, respectively. In this regard, the number of impacts required for the occurrence of initial cracks and failure in the concrete sample had a downward trend with increasing temperature. In this experimental research, AASC showed superior results compared to OPCC. The results obtained from the analysis of the images of the scanning electron microscope (SEM) on the concrete samples overlapped with the other tests of this research.
subject: Articles
  topic: section
subject: Ordinary Portland Cement Concrete (OPCC)
  topic: keywords
subject: Activated Alkaline Slag Concretes (AASC)
  topic: keywords
subject: Granulated Blast Furnace Slag (GBFS)
  topic: keywords
subject: Weight-Drop Impact Test (WDIT)
  topic: keywords
subject: Scanning Electron Microscope (SEM)
  topic: keywords
creator: Mohammadhossein Mansourghanaei
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-09-01
publication date: 2024-09-01
starting page: 47
ending page: 53
doi: 10.61186/JCER.6.3.47

Evaluation of the Impact of Driving Techniques on the Subsoil Stability of Bridge E2 in Manta, Ecuador
type: item
description: This study explored the subsurface dynamics related to pile driving for the foundation of the E2 Bridge in Manta, Ecuador, using advanced geotechnical modeling. The objective was to evaluate the impact of various driving techniques on the mechanical properties of the soil, focusing on the stress distribution and the resulting deformations. The methodology included simulation analysis to compare different driving techniques and adjust them according to the specific soil characteristics at the construction site. The results revealed that by adapting the driving techniques to the local soil conditions, a 25% improvement in subsoil stability was achieved. The conclusions highlight the importance of customizing civil engineering practices according to the geotechnical specificities of each project. The adaptation of driving techniques is proposed as a practical and feasible measure to optimize construction processes, ensuring a more efficient and safer building. Furthermore, the study offers fundamental perspectives for the standardization of driving techniques in different geological contexts, contributing significantly to the improvement of foundation methodologies used in civil engineering.
subject: Articles
  topic: section
subject: Soil mechanical properties
  topic: keywords
subject: Deep foundations
  topic: keywords
subject: Stress analysis
  topic: keywords
subject: Piling techniques
  topic: keywords
subject: Geotechnical modeling
  topic: keywords
creator: Mohammadfarid Alvansazyazdi
creator: Jhonny Patricio Flores Jarrin
creator: Marcelo Fabian Oleas Escalante
creator: Mahdi Feizbahr
creator: Rodriguez Andrade Yuri Mauricio
creator: Luis Miguel Leon Torres
creator: Dora Paulina Gaibor Llanos
creator: Sergio David Saltos Mancheno
creator: Alexis Sergio Villalba Jacome
creator: Jimenez Merchan Carmita Guadalupe
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-09-01
publication date: 2024-09-01
starting page: 40
ending page: 46
doi: 10.61186/JCER.6.3.40

Examination of the Value of Domestic Component Levels and the Weight of Company Benefits in High-Rise Building Projects
type: item
description: In a construction project, various project management activities assist in achieving project goals in planning, procurement, implementation, and control. In the construction sector, the Ministry of Public Works and Public Housing (PUPR) has mandated that at least 30-85% of products used should be domestic, as measured by the Domestic Component Level (TKDN), and the maximum value for the Company Benefit Weight (BMP) should be 15%. When combined, the TKDN and BMP values should be at least 40%. This regulation aims to reduce product imports and boost the purchase of domestic products, which can significantly improve the national economy if consistently implemented. This study employs a quantitative analysis method using data such as material specifications, material/tool prices, worker wages, Work Unit Price Analysis (AHSP), and Cost Budget Plans (RAB). The calculation shows that the total value for the project is 81.85%, comprising 73.381% for TKDN and 8.43% for BMP. Therefore, it can be confirmed that the construction project of ITS Tower 2 Building in Surabaya complies with the Presidential Regulation of the Republic of Indonesia Number 12 of 2021 mandates meeting the minimum threshold of 40%.
subject: Articles
  topic: section
subject: Domestic Component Level (TKDN)
  topic: keywords
subject: Company Benefit Weight (BMP)
  topic: keywords
subject: Building Projects
  topic: keywords
subject: Company Benefits
  topic: keywords
subject: Construction Projects
  topic: keywords
creator: Talitha Nursyifa Octavia
creator: I Nyoman Dita Pahang Putra
rights: Copyright (c) 2024 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2024-09-01
publication date: 2024-09-01
starting page: 29
ending page: 39
doi: 10.61186/JCER.6.3.29