Ductility reduction factor analysis of RC frames considering influences of infilled walls

Abstract

The value of ductility reduction factor is directly related to seismic design force. And then it has a vital impact on the safety and economy of structures. Influences of infilled walls as nonstructural members on ductility reduction factor is usual neglected in current codes. According to Chines code for seismic design of buildings six typical RC frames with different height in seismic precautionary intensity of 8-degree and design basic acceleration of ground motion of 0.2g are designed. The rationality and accuracy of finite element models are verified by comparing simulation results with test results. Finite element models of RC frame with and without infilled walls are built on OpenSees software. The influence of infilled walls on ductility reduction factor of RC frames are developed by adaptive pushover analysis (APOA) and incremental dynamic analysis (IDA). Results show that influences of infilled walls on ductility reduction factor of RC frames is significant, but with increase of structural height influences gradually decline. Based on analysis results of this paper, the value of ductility reduction factor of RC frame without infilled walls is 2.5 and that of RC frame with infilled walls is 3.6. Analysis methods affect the value of ductility reduction factor significantly. Values of ductility reduction factor based on APOA is less than those based on IDA.