THE USE OF VISCO-ELASTOPLASTIC DAMAGE CONSTITUTIVE MODEL TO SIMULATE NONLINEAR BEHAVIOR OF CONCRETE

• Published in: Acta mechanica solida Sinica 2011-10, Vol.24 (5), p.411-428
• Main Authors: Liu, Jun, Lin, Gao, Fu, Bing, Zhong, Hong
• Format: Article
• Language: English
• Subjects: Algorithms; Classical Mechanics; Computer simulation; concrete; Concretes; Constitutive relationships; Damage; energy release rate; Engineering; Mathematical analysis; Mathematical models; nonlinear behavior; Nonlinearity; rate-dependent plasticity; Surfaces and Interfaces; Theoretical and Applied Mechanics; thermodynamics; Thin Films; 不可逆热力学; 单轴拉伸; 弹塑性损伤本构模型; 损伤变量; 模型模拟; 混凝土; 非弹性应变; 非线性行为
• ISSN: 0894-9166; 1860-2134
• DOI: 10.1016/S0894-9166(11)60041-4

A visco-elastoplastic damage constitutive model is proposed for simulating nonlinear behavior of concrete. Based on traditional plastic theory, the irreversible deformation is simulated in effective stress space. In order to reflect different stiffness degradation mechanism of concrete under tensile and compressive loading conditions, both tensile and compressive damage variables are introduced, and then on the basis of energy release rate, the model is firmly derived within the concept of irreversible thermodynamics. The rate-dependent model is considered by introducing viscous regularization into the inelastic strain and damage variable, and combined with an additional elastic condition. Fully implicit backward-Euler algorithm is used to perform constitutive integration. Results of numerical examples using the proposed model agree well with test results for specimens under uniaxial tension and compression, biaxial loading and triaxial loading. Failure processes of single-edge-notched (SEN) beam and double-edge-notched (DEN) specimen are also simulated to further validate the proposed model.