Behavior of Steel Plate Shear Walls subjected to Long Duration Earthquakes
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Steel plate shear walls (SPSW) have been shown to display relatively high energy dissipating capabilities and have been often used to provide seismic resistance in buildings. Previous research has shown SPSW to be capable of maintaining stability during earthquakes by exhibiting satisfactory hysteretic behavior. However, the infill plates of these walls typically only yield in tension and have no compressive resistance, leading to the question of whether long-duration seismic excitation could detrimentally affect their behavior. This report presents the results of nonlinear inelastic dynamic analyses of various SPSWs for which earthquake magnitude, response modification factor, and duration of earthquake excitation were varied. SPSWs in this parametric study have been modeled using the commonly used diagonal strip model. Single story SPSWs with panel aspect ratios of 1:1 and 2:1 have been considered. A 3-story SPSW has also been analyzed for comparison purposes. Spectra compatible synthetically generated ground motions were used in the analyses. Response of SPSW have been compared with that of their respective boundary frames. Inelastic and residual drifts were used as indicators of performance of SPSW over the duration of the earthquake. The objective of this research is to provide an understanding of the expected ductile performance of SPSW when subjected to prolonged seismic excitation, and hopefully, an improved confidence in their seismic behavior under such conditions.