水科学与水工程2008，Vol.1Issue(3)：54-64,11.DOI:10.3882/j.issn.1674-2370.2008.03.006
Application of thermodynamics-based rate-dependent constitutive models of concrete in the seismic analysis of concrete dams
Application of thermodynamics-based rate-dependent constitutive models of concrete in the seismic analysis of concrete dams
摘要
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.关键词
concrete/constitutive model/rate dependency/concrete dam/nonlinearity/seismic analysisKey words
concrete/constitutive model/rate dependency/concrete dam/nonlinearity/seismic analysis引用本文复制引用
Leng Fei,Lin Gao..Application of thermodynamics-based rate-dependent constitutive models of concrete in the seismic analysis of concrete dams [J].水科学与水工程,2008,1(3):54-64,11.基金项目
This work was supported by the National Natural Science Foundation of China (Grant No.90510018). （Grant No.90510018）
