Seismic reliability analysis of plan-asymmetric reinforced concrete buildings with dual special frame-wall lateral force-resisting system

Abstract

The seismic reliability analysis of plan-asymmetric reinforced concrete (RC) buildings with dual frame-wall system has been targeted in this paper by combining record-to-record uncertainty with model uncertainty in the estimation of analytical collapse fragility functions. To the purpose, three building case studies, equipped with dual special RC system, were designed by modal response spectrum analysis. The mathematical models were next developed for these buildings by including lumped plastic hinge model in beams and fiber-section model in columns and walls. Both of pushover and incremental dynamic analysis (IDA) were conducted to estimate the capacity of the structural system under static and dynamic loading conditions. Collapse fragility functions were derived in terms of several earthquake intensity measures (IMs) and engineering demand parameters (EDPs) as random variables with log-normal distribution. The median and standard deviation values were then employed to estimate the probable value of percentage risk of collapse (PROC), as an index to which the structural reliability of the system could be verified. The statistics mostly indicated lower values of probable PROC when the random variable was defined in terms of the EDPs.