Effects of Seismic Sequence on Increased Response of Concrete Moment Frames with and without Shear Wall

This study investigates the effect of seismic sequence on the behavior and increased response of concrete moment frames with/without shear walls. At first, three moment resisting concrete frames with 4, 7 and 10 stories are designed and analyzed under critical single and consecutive records. In order to investigate the effect of seismic sequence phenomena, frames were subjected to nonlinear time history analysis and some parameters such as, maximum ductility demand, inter-story drift and shear deformation of shear walls are calculated. It was seen that records with peak ground acceleration (PGA) ratio of consecutive records to single’s less than 0.46 do not have any significant effect on the response of frames. As PGA ratio increased, the effect of seismic sequence on the frames is more considerable. Results show that seismic sequence phenomena has more effective on the moment frames with shear walls compared to moment frames. Moreover, for both structural systems, its effectiveness decreased as the number of stories increased.