Investigation and comparison of four new types of damper

Abstract

The unfavorable experience of the past earthquakes and their respective financial and human loss indicates the weak seismic
performance of some buildings. Hence, employing new equipment and tools is inevitable in this respect. The first idea is a
multi-level passive control system able to shift the dynamic behavior parameters such as stiffness, strength, and damping ratio
to absorb the seismic energy on multiple levels. This system is made up of a combination of nested pipe components
absorbing energy during moderate and intense earthquakes. The second idea of the paper constitutes a new metal slit damper
made of metal plates with high elevation whose metal parts are connected. The weak slit damper part is designed to work
during low to moderate seismic induction, while the strong slit damper section is designed to be activated during large
earthquakes. Another study examines the seismic behavior of a new type of damper consisting of U-shaped steel plates as
energy-dissipating elements empirically, and the last study explores the performance of U-shaped yielding steel dampers in
steel building frames. The present paper reviews and compares four types of introduced dampers