Influence of the angle of seismic incidence of long-period pulse-like ground motion on an irregular base-isolated building

In general, isolators and dampers used in seismically isolated buildings are designed to be isotropic any horizontal direction. However, the case of with plan irregularities, their nonlinear responses depend on direction seismic loading. To discuss influence angle incidence (ASI) response irregular building structures, it is important define critical axis ground motion. One possible choice “principal motion” proposed by Arias (A measurement earthquake intensity, 1970). because this principal independent natural period a structure, could complicated use for structures long periods. study, ASI long-period pulse-like input an base-isolated investigated. First, motion defined terms cumulative energy input. Then, time-history analysis five-story performed using 10 records considering various ASIs. The results show that, compared Arias, defining more suitable discussions concerning building.