An Energy Based Method for Seismic Evaluation of Structures

摘要

Seismic evaluation of structures generally involves determination of displacement demands from which story drifts, and component forces and deformations for specified hazard levels can be obtained for comparison with available capacities. A number of methods have been proposed by investigators in the past that are also used in current practice. Those methods generally involve non-linear pushover analyses. This paper presents adaptation of the energy based method that has been recently developed and successfully used for design purposes by Goel et al., (Leelataviwat et. al., 1999; Lee and Goel, 2001; Chao and Goel, 2005; Chao and Goel, 2006a; Chao and Goel, 2006b; Dasgupta et. al., 2004), called Performance-Based Plastic Design method (PBPD). The skeleton force-displacement (capacity) curve of the structure is converted into energy capacity plot which is superimposed over the corresponding energy demand plot for the given hazard level to determine the expected peak displacement demand. The method is applied to a number of example SDOF and MDOF structural systems with excellent results. The results are also compared with those obtained from time history analyses as well as by using methods proposed by other investigators.