Rahim Abdi Kordani - MSc in Civil Engineering –Structures, Department of Civil Engineering, Taft Branch, Islamic Azad University, Taft, Yazd, Iran
Nader Abdoli Yazdi - Assistant Professor, Department of Civil Engineering, Taft Branch, Islamic Azad University, Taft, Yazd, Iran

Unstiffened steel plate shear walls (SPSWs) have been in use mostly in recent years. In this numerical study, the bucklingbehavior of a single-storey single-bay unstiffened SPSW with two pinned and rigid beam-column connections under lateralloading is investigated. The SPSW had different wall aspect ratios (L/h=1, 1.5, 2, 2.5, and 3) and infill plate thicknesses(tw= 3, 5, and 7 mm). Their effect on the buckling behavior of SPSW was examined using buckling analysis in ABAQUSsoftware. Results indicated that with the increase of infill plate thickness, the lateral resistance of unstiffened SPSW systemincreases, but by increasing wall aspect ratio, its resistance decreases. In both connection designs, the model with L/h=1(square-shaped model) showed better ductility and higher stiffness and strength in all three thicknesses. Maximum shearstress responses of SPSW models showed that in pinned design with L/h=1, the most change in shear stress values was 8%when infill plate thickness reached from 5 to 7 mm; while for rigid connection, it was reported as 7% when it increasedfrom 3 to 5 mm. This indicates that in rigid connection, increasing the infill plate thickness has less effect on the increas eof lateral resistance. By examining the performance of rigid and pinned beam-to-column connections with different wallaspect ratio and infill plate thickness, it was found out that maximum shear stress in rigid connection increased by 11%compared to pin connection. It was concluded that an optimum unstiffened SPSW model had a wall aspect ratio of 1 andinfill plate thickness of 7 mm.

Steel Plate Shear Wall; Unstiffened; Pinned Connection; Rigid Connection; Aspect Ratio; Plate Thickness