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An Assessment of a Modal Pushover Method Based On 2DOF Modal System for Tall Asymmetric-Plan Buildings Original Article, C35 Seyyedi Viand S.M, Shakeri K, Vakili H, Azadi Hir M. Journal. Civil Eng. Urban. 3(4):216-220. 2013 ABSTRACT:Recently, a novel two-degrees-of-freedom (2DOF) modal system has been proposed by Lin and Tsai which considers bifurcating and interaction between modal translation and modal rotation. Also, they claim that the proposed system is accurate than the conventional single-degree-of-freedom (SDOF) modal system in estimating the seismic demands of asymmetric-plan buildings. In this paper, the efficiency of application of the proposed system for tall buildings is evaluated. Hence, a modal pushover analysis is performed for a sample tall asymmetric-plan building based on SDOF and 2DOF modal systems. Then, the seismic responses of building are estimated by utilizing nonlinear time history analysis (NTHA). Finally, the analytical results are compared. Results show that the efficiency of 2DOF modal system becomes considerable at high levels of building, in particular for rotational responses. Consequently, the new system may be an alternative to the SDOF modal system in estimating the seismic responses of asymmetric-plan buildings. Keywords: Asymmetric-Plan Buildings, Two-Degrees-Of-Freedom Modal Systems, Modal Pushover Analysis منبع: [Hidden Content] دانلود: [Hidden Content].,35-216-220.pdf J. Civil Eng. Urban.,35-216-220.pdf