An Energy Based Method for Seismic Evaluation of Structures

Abstract eng:
This paper presents a seismic evaluation procedure based on an energy concept that has been recently developed and successfully used for design purposes called Performance-Based Plastic Design (PBPD). The underlying theory and the framework for carrying out the analysis are first presented. The skeleton forcedisplacement (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 response. The method is applied to a number of example single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) structural systems with excellent results. The results are compared with those obtained from nonlinear dynamic analyses as well as those from methods proposed by other investigators including the Modal Pushover Analysis Method and the FEMA Displacement Coefficient Method. For SDOF systems, the results indicate that the proposed method provides response values that are identical to those obtained from a well-established procedure using inelastic design spectrum. For MDOF systems also, the proposed method provides response values that are reliable when compared to the results from non-linear dynamic analysis and other wellestablished nonlinear static procedures.

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