強震を受ける2層鋼構造建物で塑性変形が卓越する層を予測する方法

Abstract

The objective of this paper is to establish criteria using which one can predict the story where plastic drift dominates in two-story steel building under strong ground motion. The dynamic response analyses were conducted for Elasto-Plastic and Rigid-Plastic models. The following conclusions are obtained for the response of Rigid-Plastic model. 1) If the shear coefficient of the 2nd story exceeds the base shear coefficient, the plastic drift occurs only in the 1st story. 2) Otherwise, the plastic drift occurs also in the 2nd story. The story of which plastic drift dominates can be predicted considering the story shear coefficient, the peak ground acceleration and the mass distribution of structure as shown in Fig. 12. Similar conclusions are obtained for Elasto-Plastic model if the story shear coefficients are small enough.