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Date of Publication:2018-01-01

Journal:水利学报

Affiliation of Author(s):建设工程学部

Volume:49

Issue:8

Page Number:986-994

ISSN No.:0559-9350

Abstract:In this paper, adopting the advantages of endurance time analysis (ETA) and pushover analysis (POA) method, the POA-ETA method is proposed to realize the seismic performance analysis of concrete gravity dam, which can consider the influence of structure's multi-modes and seismic randomness. According to the analysis on basic principle of ETA and POA method respectively, the principles and the key steps of POA-ETA method are established. In POA-ETA method, ETA method is used to generate ETA history, which describes increasing peak ground acceleration and is loaded as excitation, and to get the dynamic response of structures eventually. By analyzing dynamic response, the capacity spectrum, ductility ratio-equivalent period ratio and ductility ratio-equivalent damping ratio curves are acquired to bring in POA method to evaluate seismic performance of structures. The POA-ETA method is used to calculate performance points in'moderate damage' and'severe damage' factor, and further, to analyze seismic performance and damage factor of Koyna concrete gravity dam. The results show that the POA-ETA method has high accuracy and the applicability. © 2018, China Water Power Press. All right reserved.

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