A STUDY ON SEISMIC PERFORMANCE OF EXISTING RC BUILDINGS IN HOKKAIDO USING SEISMIC CAPACITY INDEX(Structures)

Abstract

By evaluating the shear strength using the seismic capacity index, the necessary shear strength from existing earthquake-resistant standard and the suitability of seismic evaluation were investigated. The results indicate the following: 1) All buildings before strengthening and buildings with Qu≧Qun after reinforcement seem to be a strength type building. Buildings with Qu<Qun seem to be a ductile type building. 2) For the buildings with Qu<Qun, the base-shear coefficient is higher than 0.4, and there is no significant difference with the base shear coefficient of buildings with Qu≧Qun. 3) Referring to the seismic strengthening plan, the seismic performance of buildings with Qu<Qun is estimated to be more than Ds=0.5 and for buildings with Qu≧Qun, it is estimated to be equivalent to less than Ds=0.5.