Extension of the SMP, AFMP, and NADP procedures to one-way asymmetric-plan tall buildings

Abstract

In this paper, the enhanced pushover procedures including the single-run multi-mode pushover (SMP), adaptive force-based multi-mode pushover (AFMP), and non-adaptive displacement-based pushover (NADP) procedures are extended to one-way asymmetric-plan tall building structures to consider both higher modes and torsional effects in predicting the seismic responses. For this purpose, the principles of modal response analysis for one-way asymmetric-plan buildings are employed. The SMP and NADP procedures are comprised of multiple single-run force-based and displacement-based pushover analyses, respectively, while, the AFMP procedure consists of some adaptive pushover analyses. Lateral loads as well as torsional moments calculated by modal analysis are employed in the single-run and adaptive pushover analyses. The seismic responses of the structure are finally computed by enveloping the seismic demands derived from the single-run pushover analyses in the SMP and NADP procedures, and from the adaptive ones in the AFMP procedure. In order to evaluate the accuracy of the extended procedures, two one-way asymmetric-plan buildings are studied. These buildings have various coupling degrees between translational and torsional motions. The seismic responses derived from the extended procedures are compared with those from the nonlinear response history analyses (NLRHA) as a benchmark method, and with those from the modal pushover analysis (MPA), consecutive modal pushover (CMP) procedure, and the conventional pushover analysis based on the first-mode. It is demonstrated that the SMP method predicts the seismic responses more accurately than the AFMP and NADP procedures for one-way asymmetric-plan tall buildings.