inelastic seismic demand of steel-plate shear wall structures: emphasis on the ptd effect

This paper presents an analytical study to investigate the seismic demand of steel-plate shear wall frames (spsw) as a system for resisting lateral loads while subjected to the permanent tectonic displacement effect (ptd). ptd is considered to be one of the main characteristics of near-fault ground motions in which one or more high-amplitude pulses with a large period in velocity records can be observed. to this end, the seismic response of spsw frames as one of the reliable structural systems for mid-, and high-rise buildings in the form of 8-, 13-, and 18-storey frames were investigated using nonlinear dynamic analysis. three distinctive sets of ground motions (gms) were considered. accordingly, a technique was used to identify the ptd effect with a sinusoidal pulse in the acceleration diagram. the results proved that the presence of ptd pulse may increase or decrease the structural demands regarding various parameters that were fully discussed in this study. as the height of the structure increases, the main factors of increasing the inelastic demand are the ratio of the structure period to the pulse period and the ratio of ap/pga. for mid-rise spsw, the high-frequency content plays a greater role in comparison with the period ratio. for the tallest structure, the maximum demand against the fling-step effect was observed for the yarimca record where the ratio of ap/pga was the highest (0.65). in addition, the period ratio (tst/tp) was the highest (0.73) among other records