Design Eccentricity in Equivalent Seismic Load Using Modal Analysis

모드 해석을 이용한 등가 지진하중에서의 설계 편심

  • 조소훈 (서울대학교 건축학과) ;
  • 이명규 (전주대학교 토목환경공학과교수)
  • Published : 2001.09.01

Abstract

Modal analysis does well predict the elastic dynamic response of the torsionally unbalanced structure. But modal analysis overestimates the rotation of the structure in inelastic range, so one side members require ductility too much and the others require ductility too small in comparison with torsionally balanced structure. In this paper, in order to reduce difference of ductility demand between both side members of the torsionally unbalanced structure, design eccentricity of seismic load is evaluated and the method determining the strength center of structure is proposed using modal analysis. For several cases, the ductility demand of stucture is compared to investigate the propriety of the proposed approach.

Keywords