Abstract
In this paper, seismic performance of existing reinforced concrete (RC) asymmetric building and existing RC asymmetric building rehabilitated by steel braces is evaluated based on the equivalent single-degree-of-freedom (SDOF) system reduced from multi-degree-of-freedom system. In the procedure discussed in this paper, the direction of seismic input is assumed to coincide with the principal direction of the first modal response. Based on this assumption, the amplitude of seismic input, which produces the peak response corresponding to the ultimate stage of building, is evaluated from response of equivalent SDOF system. The results show that the amplitude of seismic input corresponding to the ultimate stage of existing buildings is satisfactorily evaluated by the proposed procedure. The influence of the direction of seismic input to the response of existing buildings is also discussed.
