抄録
In Japan, seismic capacity of existing building with vertical irregularities is evaluated using Fs value that represents the increase of seismic demands and is computed based on the initial stiffness of each story. In this paper, we propose a new method to compute Fs value based on the secant stiffness of each story. Dynamic analyses are conducted for two kinds of buildings: (1) reinforced concrete buildings retrofitted using steel braces and (2) reinforced concrete buildings with a top story using steel frames. The proposed method enables to evaluate the seismic capacity more accurately than the current standard.
