Seismic Assessment of Asymmetric Buildings Considering the Critical Direction of Seismic Input

摘要

In this paper, a simplified seismic assessment procedure for asymmetric frame building considering the critical direction of seismic input at each nonlinear stage is proposed. In this procedure, the critical direction of seismic input which produces the maximum response at flexible side frame is assumed to coincide with the principal direction of the first modal response, which is evaluated based on pushover analyses results at each nonlinear stage, and the peak response of flexible side frame at each seismic intensity is estimated based on equivalent linearization technique. In the numerical example, the nonlinear time-history analyses of four-story reinforced concrete asymmetric frame buildings under various directions of seismic inputs. The results show that the upper bound of peak responses at flexible-side frame by given seismic intensity and arbitrary direction of seismic input can be predicted by the results obtained from proposed procedure.