Water Science and Engineering 2008, 1(3) 54-64  DOI:   10.3882/j.issn.1674-2370.2008.03.006   ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
concrete
constitutive model
rate dependency
concrete dam
nonlinearity
seismic analysis
Authors
Fei LENG
Gao LIN
PubMed
Article by
Article by

Application of thermodynamics-based rate-dependent constitutive models of concrete in the seismic analysis of concrete dams

Fei LENG*1, 2, Gao LIN1

1. Earthquake Engineering Research Division, Dalian University of Technology, Dalian 116024, P. R. China
2. College of Civil Engineering, Hohai University, Nanjing 210098, P. R. China

Abstract

This paper discusses the seismic analysis of concrete dams with consideration of material nonlinearity. Based on a consistent rate-dependent model and two thermodynamics-based models, two thermodynamics-based rate-dependent constitutive models were developed with consideration of the influence of the strain rate. They can describe the dynamic behavior of concrete and be applied to nonlinear seismic analysis of concrete dams taking into account the rate sensitivity of concrete. With the two models, a nonlinear analysis of the seismic response of the Koyna Gravity Dam and the Dagangshan Arch Dam was conducted. The results were compared with those of a linear elastic model and two rate-independent thermodynamics-based constitutive models, and the influences of constitutive models and strain rate on the seismic response of concrete dams were discussed. It can be concluded from the analysis that, during seismic response, the tensile stress is the control stress in the design and seismic safety evaluation of concrete dams. In different models, the plastic strain and plastic strain rate of concrete dams show a similar distribution. When the influence of the strain rate is considered, the maximum plastic strain and plastic strain rate decrease.

Keywords concrete   constitutive model   rate dependency   concrete dam   nonlinearity   seismic analysis  
Received 2008-07-29 Revised 2008-09-08 Online:  
DOI: 10.3882/j.issn.1674-2370.2008.03.006
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Corresponding Authors: Fei LENG
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