抄録
In previous paper we examined the strength required for a single-degree-of-freedom system to maintain columns and beams in elastic region under earthquake loading . In this paper the equivalent singledegree-of-freedom system is discussed whose responses against earthquakes are approximately equal to those of a multi-degree-of freedom system and the ratio of the maximum base shear force of a multi-degree-of freedom system relative to the maximum shear force of the equivalent single-degree-of-freedom system is quantified. The damage concentration in a weak story caused by the inevitable fluctuations of story yield strengths is also considered. A formula is proposed to evaluate the required base shear coefficient of a multidegree-of freedom system.
