Abstract
The observed damage patterns of R/C structure in 1995 Hyogo-ken Nanbu Earthquake include first-story collapse and intermediate-story collapse. It is necessary to estimate the maximum deformation for R/C structure before earthquake occurs. Generally, maximum deformation of R/C structure is computed by dynamic response analysis for Multi-story Frame. On the other hand, there are many, simple methods to estimate the maximum deformation for single degree of freedom (SDOF) system without dynamic response analysis. In order to evaluate rationally and simply the seismic performance of existing buildings, it is thought these methods on SDOF are applicable to the estimation of maximum deformation for Multi-story Frame with Soft story (MF-S). This paper deals with two points for estimation method on maximum deformation of R/C MF-S. One is the method to transform R/C MF-S to equivalent SDOF which has the yielding period of R/C structure and the shear strength coefficient of soft story. The other is the each accuracy of two simple estimation methods using equivalent SDOF, which one is to estimate directly the maximum deformation by dynamic response analysis for equivalent SDOF and the other is to estimate the maximum deformation by solving energy balance based on energy input velocity concept in soft story. The result indicates that the accuracy of both methods are generally good.
