The influence of higher mode shapes on dynamic responses of multi-storey building structures to ground acceleration

Abstract

The objective of this paper is to study the influence of higher mode shapes on dynamic responses of multi-storey building structures subjected to ground acceleration of earthquakes. The selected structure in this investigation is a analytical model of a 40-storey, 50-storey building with variuos plan discreted by finite element method in dynamic analysis by ETABS software and the ground acceleration of the Elcentro, Santa and Lucerne earthquakes used to dynamic analysis. The method of modal superposition is applied to derive the dynamic response as displacement, bending moment and shear force in the time domain. The numerical results show that the dynamic responses are still increasing in higher mode shapes considered.

Keywords: Multi-storey building structure; dynamic analysis; ground acceleration of earthquake; higher mode shapes.