Seismic Performance Evaluation of the High-Rise Building Using Nonlinear Analysis

Abstract

A core wall system is commonly used as a lateral-load-resisting system of a high-rise building. The use of coupled shear walls connected by coupling beams is necessary due to the presence of openings at the core walls. Generally coupling beams yield prior to shear walls under seismic actions, because the beams are designed much weaker than the walls. Likewise, the cyclic behavior of coupling beam elements significantly affects the energy dissipation characteristics of a core wall system. In this study, the seismic performance evaluation of a high-rise building with core wall system is carried out by performing a series of nonlinear static and dynamic analyses using ETABS 2016. The nonlinear time history analyses are conducted using seven earthquake records at each of Design Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE) levels. And the results of seismic performance evaluations by nonlinear static procedure and time history analyses are compared. The responses of the high-rise building according to the modeling methods of the basement and the characteristics of earthquake records are also studied. Based on the analysis results, the coefficient method suggested by ASCE 41-13 nonlinear static analysis procedure generally overestimates the seismic performance of the high-rise building compared to the nonlinear time history analysis. The responses above the ground level are similar regardless of the basement modeling methods, but there are large differences below the ground level depending on the basement models. The responses of nonlinear time history analysis are very sensitive depending on the characteristics of ground motions. Because of the influence of the higher modes, the results of the nonlinear time history analysis largely differ from those of the nonlinear static analysis.