IMPACT OF FRAME ASPECT RATIO ON THE SEISMIC PERFORMANCE OF SELF-CENTERING STEEL PLATE SHEAR WALL

Self-Centering Steel Plate Shear Walls (SC-SPSW) are a new generation of seismic-resisting frames that have recently been introduced into the world of structural engineering. The primary concept of SC-SPSW is based on implementing steel plate shear walls as an energy-dissipating system paired with post-tensioned strands as a self-centering system in structures. Steel plate shear walls absorb the seismic lateral load, concentrating the likely damage within themselves to make the main structural elements such as beams and columns remain almost undamaged. Post-tension strands bring the structure back to its pre-earthquake position to eliminate or reduce residual drift after an earthquake. In this paper, collapse potential, seismic performance, and the impact of aspect ratio on the seismic parameters of SC-SPSWs were investigated. Nine archetypes were selected for this study, which are 5-, 7-, and 10-story structures with three aspect ratios of 0.8, 1.5, and 2.5 for SC-SPSW frames to examine the impact of aspect ratio on the SC-SPSW behavior. The results of archetype design suggest that the SC-SPSW frames with a panel aspect ratio of 1.5 have less weight in comparison with the other archetypes. Furthermore, nonlinear static and incremental dynamic analysis results of the archetypes demonstrate that the seismic performance criterion of FEMA P695 could be passed in the archetypes with an aspect ratio of 1.5, while the other archetypes need to be redesigned with a lower R-factor. It can be concluded that the best aspect ratio for the SC-SPSW panel is around 1.5, which results in lower structural weight and better seismic performance.