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Shock and Vibration
Volume 2016 (2016), Article ID 6841836, 8 pages
http://dx.doi.org/10.1155/2016/6841836
Research Article

Seismic Damage Analysis of Concrete Gravity Dam Based on Wavelet Transform

1School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
2College of Mechanics and Materials, Hohai University, Nanjing 210098, China

Received 6 October 2015; Revised 20 January 2016; Accepted 7 February 2016

Academic Editor: Mario Terzo

Copyright © 2016 Dunben Sun and Qingwen Ren. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The key to the dam damage assessment is analyzing the remaining seismic carrying capacity after an earthquake occurs. In this paper, taking Koyna concrete gravity dam as the object of study, the dynamic response and damage distribution of the dam are obtained based on the concrete damage plastic constitutive model. By using time-frequency localization performance of wavelet transform, the distribution characteristics of wavelet energy for gravity dam dynamic response signal are revealed under the action of different amplitude earthquakes. It is concluded by numerical study that the wavelet energy is concentrated in low-frequency range with the improving of seismic amplitude. The ultimate peak seismic acceleration is obtained according to the concentration degree of low-frequency energy. The earthquake damage of the dam under the moderate-intensity earthquake is simulated and its residual seismic bearing capacity is further analyzed. The new global damage index of the dam is proposed and the overall damage degree of the dam can be distinguished using defined formula under given earthquake actions. The seismic bearing capacity of the intact Koyna dam is 591 gal considering the dam-water interaction and its residual seismic bearing capacity after simulating earthquake can be calculated.