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: In collaboration with Golestan University and Assoc. Prof. Dr. Morteza Jamshidi
language: en
publication name: Journal of Civil Engineering Researchers
issn: 2538-516X
items: Groundwater Flow Modeling Using Finite Element Method and Intelligent Aquifer Mesh
items: Numerical analysis of the steel fiber reinforced concrete piles and prestressed concrete beam
items: Numerical Development of a Re-centering Damper with High Seismic Performance, Including Friction Wedges and SMA Rods
items: Numerical investigation of a steel frame braced with a central-cylinder cable system using shape memory alloy
items: Production of Green Concrete Using Waste Carbonation Lime Residue from Sugar Factory
items: The Effect of Using Fly Ash with Various Additives on the Microstructure and Compressive Strength of Self-Compacting Concrete (Review Study)
items: A Comparative Analysis of Ensemble NWP Models for Flood Forecasting
items: Numerical investigation of the behavior of concrete beams reinforced with FRP polymer stirrups in the form of straps
items: Integrating Weighted Delay Index (WDI) with Dynamic Critical Path Analysis for Enhanced Delay Assessment in Construction Projects
items: Simplified Unified Model for Flexural Capacity of Ductile HPC Beams with A Low Reinforcement Ratio
items: Mechanical Performance and Freeze–Thaw Durability of Expansive Clay Stabilized with Graphene Oxide and Fly Ash: A Laboratory Study
items: Investigation on Seismic Behavior of Steel Frames with semi-active Rotational Friction Dampers
items: Damage Identification in Beams and Plates Using Wavelet Theory and Firefly Optimization Algorithm
items: Optimal Placement of Viscoelastic Layers in Sandwich Beams for Maximum Vibration Attenuation and Minimum Creep Deflections
items: Optimizing Date Seed Utilization in Green Concrete: A Methodological Evaluation
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

Groundwater Flow Modeling Using Finite Element Method and Intelligent Aquifer Mesh
type: item
description: In groundwater flow modeling, as in any modeling problem, a certain amount of error is inevitable. In groundwater flow and contaminant transport modeling, recharge and discharge wells act as point sources or sinks. How these wells are treated can influence accuracy and reduce uncertainty or increase the amount of error. This study investigates an intelligent aquifer mesh. To illastrate the theory, two hypothetical aquifers with triangular and square elements were examined, in both confined and unconfined conditions. In the intelligent aquifer mesh, after gridding the model domain, pumping or recharge wells are considered as nodes. Consequently, the numbering of nodes and elements are updated accordingly. Groundwater flow modeling is performed on the updated mesh to enhance accuracy. The results of this research indicated that considering the recharge and pumping wells as a node and re-gridding the model area can perform groundwater flow modeling with more accuracy and ultimately the results will be more reliable.
subject: Articles
  topic: section
subject: Aquifer
  topic: keywords
subject: Finite Element Method
  topic: keywords
subject: Groundwater Flow Modeling
  topic: keywords
subject: Intelligent Aquifer Mesh
  topic: keywords
subject: Pumping Well
  topic: keywords
creator: Mohammad Javad Zeynali
creator: Mohammad Nazeri Tahroudi
creator: Omolbani Mohammadrezapour
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.77

Numerical analysis of the steel fiber reinforced concrete piles and prestressed concrete beam
type: item
description: This paper studies the structural behavior of prestressed concrete beams and steel fiber reinforced concrete piles. A nonlinear finite element formulation based on the principle of virtual work is developed to analyze the response of these prestressed structural elements under applied loads. The model accounts for material nonlinearity, second-order effects, and variable stiffness through an incremental loading procedure. Simpson’s integration scheme is adopted to evaluate the cross-sectional response of each element. The governing equations describing beam behavior are established, and the influence of compressive strength and prestressing force on structural performance is examined. Experimental tests conducted on prestressed concrete beams and steel fiber–reinforced concrete piles are used to validate the proposed approach. A comparison between numerical and experimental results demonstrates the accuracy and reliability of the developed formulation.
subject: Articles
  topic: section
subject: Prestressed concrete beams, Steel fiber-reinforced concrete piles, Nonlinear finite element analysis, Virtual work principle, Constitutive modeling, Experimental validation.
  topic: keywords
creator: Fatiha Iguetoulene
creator: Youcef Bouafia
creator: Mohand Said Kachi
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.1

Numerical Development of a Re-centering Damper with High Seismic Performance, Including Friction Wedges and SMA Rods
type: item
description: Re-centering dampers, developed using shape memory alloy (SMA)-based dampers and their superelasticity capability, absorb earthquake energy and provide a re-centering capability for the structure. In this study, the laboratory sample of Zhang's re-centering damper was first validated using ABAQUS software, followed by parametric analysis involving changes in the number and diameter of SMA rods, the friction coefficient of the wedges, and the placement configuration of two dampers, which were numerically investigated. The results indicated that increasing the diameter and number of rods, as well as the friction coefficient, enhances seismic resistance and stiffness but reduces ductility; excessive increase in friction only boosts the stiffness and ductility of the damper's compressive section while reducing seismic resistance. A friction coefficient of approximately 0.12 is recommended, whereas Zhang assumed 0.09. Additionally, the results showed: in parallel configuration, resistance and stiffness are higher but ductility is lower, whereas in series configuration, all three parameters decrease.
subject: Articles
  topic: section
subject: Numerical Development
  topic: keywords
subject: Re-Centering Damper
  topic: keywords
subject: SMA
  topic: keywords
subject: Friction Wedge
  topic: keywords
creator: Mahdi Mashhadiyan
creator: Jalal AkbarKamali
creator: Esmaeil Mousapoor
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 68
ending page: 77
doi: 10.61186/JCER.7.4.68

Numerical investigation of a steel frame braced with a central-cylinder cable system using shape memory alloy
type: item
description: Conventional steel braces increase the risk of structural damage during earthquakes due to compressive buckling. In this study, the performance of a steel frame equipped with a memory alloy cable brace with a central cylinder is investigated through numerical modeling in ABAQUS. This system is expected to exhibit superior seismic performance compared to traditional braces due to characteristics such as superelasticity, self-centering, and energy dissipation, and to return to its initial state after an earthquake. It can significantly enhance the seismic performance of steel frames with minimal construction interference and reduced construction time. After model validation, this study evaluates the effects of cable type, memory alloy properties, and cable diameter on the lateral performance of the steel frame with central cylinder cable braces. The results indicate that even using steel cables in this system significantly increases strength, stiffness, and energy absorption compared to a frame without braces, although ductility decreases by 25%. Replacing the steel cable with a memory alloy cable simultaneously improves strength, stiffness, energy absorption, and ductility (by 10%) compared to the steel-cable specimen, compensating for the ductility reduction. Furthermore, enhancing the superelastic properties of the memory alloy increases the load-bearing capacity and absorbed energy, while increasing the memory alloy cable diameter (from 6 to 16 mm) improves all performance indicators, especially stiffness and strength, without significant loss of ductility. Overall, the results demonstrate that using memory alloy cables, along with optimizing their properties and diameter, is an effective approach for simultaneously improving strength, stiffness, ductility, energy dissipation, and seismic behavior of structures.
subject: Articles
  topic: section
subject: Numerical Development
  topic: keywords
subject: Braced Steel Frame
  topic: keywords
subject: Cable Brace System
  topic: keywords
subject: Memory Alloy
  topic: keywords
subject: ABAQUS
  topic: keywords
creator: Mohammadreza Oliaei
creator: MohammadHadi Moallemi
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 12
ending page: 22
doi: 10.61186/JCER.7.4.12

Production of Green Concrete Using Waste Carbonation Lime Residue from Sugar Factory
type: item
description: This research investigates the possibility of producing green concrete using Carbonation Lime Residue (CLR), a waste by-product from the Naghsh-e Jahan Sugar Factory in Isfahan (Iran). The primary objective is to recycle this industrial waste by utilizing it as a partial replacement for cement in concrete production, aligning with waste management goals, environmental preservation, and economic benefits. Concrete samples were prepared with different percentages of CLR replacement (0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%) for cement, maintaining a constant water-to-cement ratio of 0.35. These samples were subjected to compressive strength tests (at 7, 28, and 56 days) and tensile strength tests (Brazilian method). The results indicated that both compressive and tensile strengths decrease with an increase in the replacement percentage. This reduction is primarily attributed to the presence of impurities and sugary substances in the CLR, as confirmed by SEM and EDX analyses. However, it was observed that up to a 25% replacement level, the reduction in compressive and tensile strengths was less than respectively 15% and 10%. This level of reduction is considered acceptable given the environmental and economic advantages derived from utilizing this waste material. Therefore, using waste CLR as a cement replacement in concrete up to 25% is deemed a practical and effective solution, particularly for non-structural applications or in regions near sugar factories, contributing to sustainable development and a circular economy.
subject: Articles
  topic: section
subject: Green Concrete
  topic: keywords
subject: Carbonation Lime Residue (CLR)
  topic: keywords
subject: Recycling
  topic: keywords
subject: Cement Replacement
  topic: keywords
subject: Compressive Strength
  topic: keywords
subject: Sustainable Development
  topic: keywords
creator: Zahra Heidari
creator: Rasoul Shadnia
creator: Davood Mostofinejad
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.39

The Effect of Using Fly Ash with Various Additives on the Microstructure and Compressive Strength of Self-Compacting Concrete (Review Study)
type: item
description: This review article provides a comprehensive investigation into the effects of utilizing fly ash (FA) along with other mineral additives such as metakaolin (MK), silica fume (SF), hydrated lime (HL), and others on the properties of Self-Compacting Concrete (SCC). The primary objective of this study is to analyze and synthesize existing research on the simultaneous influence of various chemical additives and fly ash on the microstructure and compressive strength of self-compacting concrete. Recognized for its ease of implementation and enhanced performance, self-compacting concrete is considered an advanced technology in the concrete industry, and the use of mineral additives, particularly fly ash, can contribute to the improvement of its mechanical properties and durability.The methodology of these studies primarily involves examining the concrete microstructure using Scanning Electron Microscopy (SEM) and evaluating the compressive strength of concrete specimens at different ages. Results indicate that partial replacement of cement with activated fly ash (using sodium hydroxide) can reduce the hydration process while enhancing pozzolanic reactions, leading to improved strength properties. The optimal performance of activated fly ash-based SCC, in terms of strength, was observed at 10% to 15% replacement. SEM images revealed that fly ash particles are spherical, whereas activated fly ash particles are angular and elongated, which contributes to improved concrete matrix density and reduced porosity, thereby increasing compressive strength.Furthermore, studies on concrete containing mineral additives demonstrated that MK provides higher initial strength compared to other additives. This study concludes that the use of fly ash and other mineral additives, particularly in combination with activators or hydrated lime, can effectively enhance the mechanical and microstructural properties of self-compacting concrete, making it a sustainable and efficient option for constru…
subject: Articles
  topic: section
subject: Self-Compacting Concrete (SCC)
  topic: keywords
subject: Fly Ash
  topic: keywords
subject: Compressive Strength
  topic: keywords
subject: Mineral addition
  topic: keywords
subject: Scanning Electron Microscopy (SEM)
  topic: keywords
subject: Interfacial Transition Zone (ITZ)
  topic: keywords
creator: Meysam Gholami
creator: Omid Hasanshahi
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.16

A Comparative Analysis of Ensemble NWP Models for Flood Forecasting
type: item
description: This study presents the first application of gamma quantile mapping to bias-correct ensemble precipitation forecasts from seven global NWP models (ECMWF, NCEP, UKMO, CMA, JMA, ECCC, NCMRWF) in the data-scarce Saliyan Basin, Iran. The integration of these models with advanced bias correction techniques significantly improves flood forecasting accuracy. To address systematic biases in the raw forecasts, gamma quantile mapping was applied, significantly enhancing the reliability of the precipitation inputs. These bias-corrected forecasts were then used as inputs for the GR4J hydrological model to simulate river flow and predict flood events. The study period included a major flood event in March 2019, which was used to evaluate the performance of the ensemble forecasting system. Results demonstrated that bias correction using gamma quantile mapping substantially improved the accuracy of flood forecasts, with the ECMWF and UKMO models showing the highest skill scores. The ensemble approach effectively captured the uncertainty in flood predictions, providing valuable insights for risk assessment and decision-making. This research highlights the importance of bias correction in ensemble forecasting and offers a robust framework for flood prediction in data-scarce regions. The findings have significant implications for improving flood early warning systems and mitigating flood-related damages in similar basins worldwide.
subject: Articles
  topic: section
subject: Flood Forecasting
  topic: keywords
subject: Ensemble Numerical Weather Prediction (NWP)
  topic: keywords
subject: Gamma Quantile Mapping
  topic: keywords
subject: Uncertainty Analysis
  topic: keywords
subject: Iran
  topic: keywords
creator: Saleh Aminyavari
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 23
ending page: 33
doi: 10.61186/JCER.7.4.23

Numerical investigation of the behavior of concrete beams reinforced with FRP polymer stirrups in the form of straps
type: item
description: In reinforced concrete structures that are in corrosive environmental conditions, there is always a discussion of reinforcement corrosion. Therefore, because of the smaller diameter compared to longitudinal rebars and closer to the surface and consequently closer to the corrosive factors, stirrups are more affected by this corrosion. One of the most effective ways to prevent corrosion of stirrups is to use FRP rebars in structures exposed to corrosion. One of the disadvantages of using FRP rebar is that it is brittle, which makes it impossible to bend these rebars in a workshop environment. Therefore, a group of researchers suggested the use of straps made of FRP plates as stirrups and concluded some laboratory studies in this field. Now, the main goal of this study is to numerically investigate the behavior of beams made with this type of stirrups. For this purpose, 13 beams were modeled in Abaqus software and subjected to three-point bending loading. Also, things such as the type of FRP used, the width of the stirrups, the number of layers of the stirrups and the installation location of these stirrups were investigated and studied. The results of this study showed FRP stirrups with a cross-section equal to steel stirrups have a higher load capacity than beams with steel stirrups. Also, in terms of the beam's ductility, the beam with FRP stirrups has less ductility than the beam with steel stirrups. Regarding the effect of the number of FRP stirrup layers, the results showed that in stirrups with fixed width and variable number of layers, increasing the number of FRP stirrup layers will increase the bearing capacity and reduce ductility.
subject: Articles
  topic: section
subject: FRP polymer fibers
  topic: keywords
subject: FRP stirrup
  topic: keywords
subject: FRP strap
  topic: keywords
subject: Rebar corrosion
  topic: keywords
subject: Corrosive environment
  topic: keywords
creator: Navid Jamali
creator: Rahamt Madandoust
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.9

Integrating Weighted Delay Index (WDI) with Dynamic Critical Path Analysis for Enhanced Delay Assessment in Construction Projects
type: item
description: <span lang="EN-GB" style="font-size: 12.0pt; mso-bidi-font-size: 18.0pt; line-height: 115%; font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: Arial; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-GB; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold;">Project delay remains one of the most persistent challenges in construction management, often leading to significant cost overruns, contractual disputes, and stakeholder dissatisfaction. Traditional scheduling and delay analysis methods—such as Critical Path Method (CPM), Earned Value Management (EVM), and conventional Extension of Time (EOT) techniques—tend to overlook the relative importance of activities and the dynamic nature of project execution. This study introduces the Weighted Delay Index (WDI), a novel metric that integrates activity-specific weights with dynamic critical path analysis to provide a more nuanced evaluation of delay severity. Activity weights are derived through the Analytical Hierarchy Process (AHP), incorporating four key dimensions: time, cost, risk, and technical impact. The methodology is validated through multiple case studies of construction projects, where WDI trends are compared against actual project delays determined via Time Impact Analysis. Results indicate that Project Duration is the dominant predictor of overall delays, while WDI offers significant diagnostic and managerial value by identifying critical activities whose delays disproportionately affect project performance. Workforce Intensity is found to moderate delay outcomes, with higher intensity generally reducing delay severity. The proposed framework provides project managers with an early-warning and prioritization tool, enabling targeted intervention strategies that go beyond aggregated delay measures. The study contributes to both the…
subject: Articles
  topic: section
subject: Construction project delays
  topic: keywords
subject: Weighted Delay Index (WDI)
  topic: keywords
subject: Dynamic Critical Path Method
  topic: keywords
subject: Extension of Time (EOT) methods
  topic: keywords
subject: Delays
  topic: keywords
creator: Amin Moradi
creator: Mohsen Asgharinia
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.47

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

Mechanical Performance and Freeze–Thaw Durability of Expansive Clay Stabilized with Graphene Oxide and Fly Ash: A Laboratory Study
type: item
description: Expansive clay soils are characterized by their high water affinity and significant volume changes, which frequently result in structural issues such as swelling, settlement, and cracking, particularly under freeze–thaw (F–T) conditions. This study investigates a dual-stabilization method using fly ash (FA: 5–15%) and graphene oxide (GO: 0.05–0.15%) to enhance the mechanical strength and durability of such soils. After 28 days of curing, samples underwent 3, 6, and 9 F–T cycles, followed by unconfined compressive strength (UCS) testing. Results show that the GO–FA combination significantly improved soil performance, with the optimal mix (10% FA + 0.1% GO) achieving a 76% increase in UCS at zero cycles and reducing strength loss after nine cycles by over 45% compared to untreated soil. These outcomes demonstrate the promise of GO–FA stabilization as a sustainable and effective solution for expansive soils in cold-region geotechnical engineering.
subject: Articles
  topic: section
subject: Expansive Clay
  topic: keywords
subject: Freeze–Thaw Cycles
  topic: keywords
subject: Graphene Oxide
  topic: keywords
subject: Fly Ash
  topic: keywords
subject: Soil Stabilization
  topic: keywords
creator: Abdolah Ataeifar
creator: Ata Jafary Shalkoohy
creator: Payam Eshghi
creator: Hamidreza Ghaderi Niri
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 88
ending page: 99
doi: 10.61186/JCER.7.4.88

Investigation on Seismic Behavior of Steel Frames with semi-active Rotational Friction Dampers
type: item
description: In this study, the performance and efficiency have been investigated of friction damper in semi-active control mode in structural responses under the influence of Chichi, Kobe, Tabas and Gazli earthquakes in the near field. Semi-active friction dampers made up of two plates that are slipping over. The contact force between the pages is changed according to the order of the control algorithm and the force on the structure is adjusted at any time during the earthquake. The LQR control algorithm and the shear control rule have been used to determine the contact force at any given moment. A structural ten-story steel X shape bracing system in both directions under dynamic analysis for numerical studies selected and subjected to vibration 4 earthquake specifications and content of different frequency in software Etabs to obtain matrices of mass and stiffness and Matlab to evaluate the different states of being The damper has been investigated. Structural responses in all classes is determined and compared. The results indicate that the use of a friction damper leads to a reduction of displacement, In the mode of using the damper in a semi-active control mode, it is better than active or inactive mode. The damper layout is also examined in four modes, which shows that the use of the damper around the structural plan is better. For example, the base shear when the damper is in around the plan, In active and inactive control mode, it has increased by 41.4% and 84.86% relative to the semi-active control status
subject: Articles
  topic: section
subject: Frictional damper
  topic: keywords
subject: Semi-active Control
  topic: keywords
subject: Seismic Behavior of Steel Frames
  topic: keywords
subject: Dynamic analysis
  topic: keywords
creator: Hadi Bahri
rights: Copyright (c) 2026 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2026-03-01
publication date: 2026-03-01
doi: 10.61186/JCER.8.1.61

Damage Identification in Beams and Plates Using Wavelet Theory and Firefly Optimization Algorithm
type: item
description: Identifying the location and severity of structural damage represents one of the most critical challenges in civil engineering. The ability to identify damage in its earliest stages cannot be overstated in terms of importance. Among the most powerful tools available for damage detection and generally structural health monitoring can name signal data processing. This study uses a two-step procedure based on wavelet theory and an optimization method to identify the location and severety of damage in beams and plates. The damage simulates through the introduction of cracks at targeted locations. Acceleration responses obtained from a dynamic analysis using finite element method undergo wavelet transformation, enabling detailed analysis of the dynamic response signals. Through filtering processes, the structural response signal details are extracted. Disturbances appearing in the signal detail plots indicate the presence of damage, leading to the development of a quantitative index for determining probable damage locations. The second phase is used to properly determine the location and magnitude of the damage using firefly optimization algorithm. To assess the effectiveness of the proposed method, five numerical examples including three beams with varying characteristics and 16, 27, and 20 elements, respectively, and two plates with different support conditions—one with two-edge fixed supports and another with four-edge fixed supports are considered. Different damage scenarios are considered for structures. The findings indicate that the proposed method shows outstanding results in terms of identifying the location and severity of damage using acceleration responses with considering noise interferences.
subject: Articles
  topic: section
subject: damage detection
  topic: keywords
subject: wavelet theory
  topic: keywords
subject: optimization
  topic: keywords
subject: firefly algorithm
  topic: keywords
subject: Beams and Plates
  topic: keywords
creator: Saeed Fallahian
creator: Seyed Mohammad Seyedpoor
creator: Himan Khodaei
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 34
ending page: 67
doi: 10.61186/JCER.7.4.34

Optimal Placement of Viscoelastic Layers in Sandwich Beams for Maximum Vibration Attenuation and Minimum Creep Deflections
type: item
description: Until now, various mathematical models have been proposed to characterize the behavior of viscoelastic materials and facilitate their implementation in finite element software. However, it remains unclear which configuration of the viscoelastic layer along the thickness and length of the beam yields the lowest creep deflection and highest damping effect under applied forces. To fill this literature gap, efforts are undertaken in this study to identify the optimal placement of the viscoelastic layers in the sandwich beam. To reach this aim, the creep and dynamic behaviors of sandwich beams with different boundary conditions and various configurations of the viscoelastic layer along the thickness and length were investigated using a finite element model. The obtained results indicate that the damping capability and creep deformations of the sandwich beam are strongly affected by the position of the viscoelastic layers.
subject: Articles
  topic: section
subject: Sandwich Beams
  topic: keywords
subject: Viscoelastic Layers
  topic: keywords
subject: Vibration Attenuation
  topic: keywords
subject: Optimal Position
  topic: keywords
subject: Finite Element
  topic: keywords
creator: A.R. Gorji
creator: M. Lezgy-Nazargah
creator: A. Ghafourian-Mojaver
creator: M. Tayebinia
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 78
ending page: 87
doi: 10.61186/JCER.7.4.78

Optimizing Date Seed Utilization in Green Concrete: A Methodological Evaluation
type: item
description: Concrete is one of the most widely used construction materials globally; however, its production contributes significantly to carbon dioxide emissions. In the Middle East, annual date production is substantial, and date seeds, as a byproduct, are typically discarded. This study investigates three methods for incorporating date seeds into concrete: (1) Cement replacement: Using powdered date seeds (PDS) as a partial substitute for cement at 5%, 10%, 15%, and 20% levels; (2) Aggregate replacement: Replacing coarse aggregates with crushed date seeds (CDS) at 10%, 20%, and 30% ratios and (3) Hybrid approach: Combining PDS (0%, 5%, 10%, and 20%) with fly ash (fixed at 20%). Mechanical tests revealed that replacing cement with up to 10% PDS had no significant impact on compressive strength, whereas higher replacement levels reduced strength. Similarly, increasing the aggregate replacement percentage led to a decline in concrete strength. In contrast, the hybrid approach—combining PDS with 20% fly ash—enhanced compressive strength. Based on these findings, the third method emerged as the most effective for improving both the strength and sustainability of concrete. The optimized hybrid mixture was selected for further comprehensive evaluation, including tests for tensile strength, flexural strength, water absorption (porosity), sulfate resistance, and freeze-thaw durability. These assessments aimed to verify not only the mechanical properties but also the long-term durability of the modified concrete under diverse environmental conditions.
subject: Articles
  topic: section
subject: Date Seed Concrete
  topic: keywords
subject: Cement
  topic: keywords
subject: Aggregate
  topic: keywords
subject: Fly Ash
  topic: keywords
subject: Mechanical Properties
  topic: keywords
subject: Durability
  topic: keywords
subject: Carbon Footprint Reduction
  topic: keywords
creator: Shadzi Rezaei
creator: Rasoul Shadnia
creator: Mojtaba Lezgi Nazarghah
rights: Copyright (c) 2025 Journal of Civil Engineering Researchers https://creativecommons.org/licenses/by/4.0
date: 2025-12-01
publication date: 2025-12-01
starting page: 1
ending page: 11
doi: 10.61186/JCER.7.4.1

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