Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques

Chongqing, China

Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques

Chongqing, China
SEARCH FILTERS
Time filter
Source Type

Long Y.-C.,Chongqing University | Long Y.-C.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques | Li Z.-L.,Chongqing University | Li Z.-L.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques
Gongcheng Lixue/Engineering Mechanics | Year: 2010

An anisotropic compressive damage model based on energy dissipation mechanism is developed to model the hysteretic behavior of concrete by introducing the nonlinear unloading/linear reloading branches into the conventional continuum damage model. The damage factor representing the stiffness degradation is defined as a function of the dissipating energy accumulated during loading histories. The model is applied to simulating a concrete test under cyclic compression and the influence of damage exponent θ is also investigated. The results show that the stress-strain response calculated by the model is highly comparable to that obtained by the test. The numerical response reflects the nonlinear behavior of concrete under cyclic compression, e.g. the stiffness degradation, accumulation of residual deformation and hysteretic energy dissipation. Moreover, the value of damage exponent θ has a remarkable influence on the computational accuracy. The numerical simulation shows that the model is applicable to analyzing the behavior of concrete under cyclic compression.


Long Y.-C.,Chongqing University | Long Y.-C.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques | Xu S.-Q.,Chongqing University | Xu S.-Q.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques | And 2 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2011

To investigate the strengthening effect of cantilever reinforcement, a plastic-damage model of concrete and the steel-stiffening approach for modeling steel-concrete interaction are used to analyze the seismic response of high arch dam with and without the presence of reinforcement. The calculated results show that this measure reduces the nonlinear response of an arch dam, e.g. joint opening and the relative deformation of dam crest, and limits the extension and opening width of cracks. It is concluded that cantilever reinforcement is beneficial to improving the earthquake-resistant capacity of the arch dam. The results also show that the strengthening effect of the proposed reinforcement is insufficient for the engineering demand. Therefore, cantilever reinforcement should be modified and optimized for the arch dam.


Long Y.-C.,Chongqing University | Long Y.-C.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques | Li Z.-L.,Chongqing University | Li Z.-L.,Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques
Gongcheng Lixue/Engineering Mechanics | Year: 2011

A modified anisotropic damage model is developed by introducing two independent damage evolution rules to simulate the distinct behaviors of concrete due to tensile cracking and compressive crushing. Herein, the hysteretic behavior under cyclic loading is modeled using nonlinear unloading-linear reloading stress branches. The calibrating method of key parameters is also proposed. Subsequently, the model is used to analyze the response of concrete under cyclic tension and tensile-low compressive load. The stress-strain curves calculated by the model are highly comparable to those obtained by the tests and they reflect the damage-induced stiffness degradation, accumulation of residual deformation, hysteretic energy dissipation and stiffness recovery effect due to crack closing. The numerical results show that the modified damage model is applicable to simulating the nonlinear behavior of concrete under cyclic loading.

Loading Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques collaborators
Loading Key Laboratory of Chinese Education Ministry for City Building in Mountain Area and New Techniques collaborators