Showing papers by "Reza Attarnejad published in 2021"

Experimental investigation of smart shear dampers with re-centering and friction devices

Abstract: Eccentrically braced frames (EBFs) with vertical shear links are lateral load resisting systems having considerable strength and ductility. In this study, an innovative hybrid damper, consisting of four shape memory alloy (SMA) plates, two friction devices, and six polyurethane springs, is proposed and evaluated as a replacement for the vertical shear link. The proposed smart shear dampers are designed to lessen the frequency and severity of deformation and damage to the main structure by earthquakes. Because the proposed smart shear damper is independent of the main structure, it can be repaired rapidly, which lowers the cost of maintenance. Other advantages include ease of assembly and installation. In this study, the seismic performance of the proposed damper is experimentally investigated and evaluated. Quasi-static cyclic loading with displacement control is applied to the side of the damper, and the components of the damper are considered individually. Eight shear dampers, including four SMA plates and four steel plates, are tested under identical loading protocols, and then the effect of each component is measured. The results show that the proposed SMA damper decreases residual displacement by 50%–95% depending on the type of damper system and that the polyurethane springs of the proposed shear damper provide considerable re-centering capability.