Influence of Infill Wall Stiffness on The Fundamental Time Period of RC Frame Buildings

Abstract

Fundamental time period of structure is the most censorious parameter for seismic design of structure. Fundamental period of building depends upon geometry of building, mechanical properties of construction materials and other various factors. In this research, impact of infill wall panel stiffness on the fundamental time period of regular reinforced concrete frame building was investigated. A total of 180 regular building models were studied by using finite element software. Infill wall panels were modelled as single equivalent diagonal strut macro-models. It was found that infill wall stiffness has considerable influence on the fundamental period of RC building and should be considered in the prediction of fundamental period. After analysis different analytical equations are given from regression analysis in which fundamental time period of building is depends on height of building, base dimension of building, modulus of elasticity of infill wall panel and thickness of infill wall panel.