Journal of Civil Engineering Researchers
Volume:2 Issue: 1, 2020

The unfavorableexperience of the pastearthquakes 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 yieldingsteel dampersin steel building frames. The present paper reviews and compares four types of introduced dampers.

Structural control systems are used to reduce structural damage in earthquakes. These systems have developed significantlyover the last few decades. They can be broadly classified into three categories: 1) Passive control system in which structures are equipped with devices that do not require an external energy source. 2) Active control systems in which the structures are equipped with processing and transmission sensors and in which there are devices that need an external energy source to work, and 3) Semi-active control system to change There are structural properties that require little external energy. In the present review article, we have tried to fully evaluate this field of study by evaluating four valid articles in the field ofevaluating the effects of energy consuming dampers in steel frames. The results of the studies showed that the presence of various dampers including new submersible metal dampers, hybrid, viscoelastic, submersible strip wave and two-level submersible torque has caused the performance indicators of the steel frame, including; Shear strength, displacement of structural floors, energy, hysterical performance (hysteresis curve), etc., which indicates the performance of the structure,has been improved and in all evaluated indicators, the structure hasincreased the level of performance.