Practical elasto-plastic damage model for dynamic loading and nonlinear analysis of Koyna concrete dam
来源期刊：中南大学学报(英文版)2013年第9期
论文作者：QI Hu(齐虎) LI Yun-gui(李云贵) Lü Xi-lin(吕西林)
文章页码：2586 - 2592
Key words：stiffness damp; strain-rate sensitivity; concrete; constitutive model
Abstract: The elasto-plastic damage model for concrete under static loading, previously proposed, was extended to account for the concrete strain-rate through viscous regularization of the evolution of the damage variables. In order to describe the energy dissipation by the motion of the structure under dynamic loading, a damping model which only includes stiffness damp stress was proposed and incorporated into the proposed rate dependent model to consider the energy dissipation at the material scale. The proposed model was developed in ABAQUS via UMAT and was verified by the simulations of concrete specimens under both tension and compression uniaxial loading at different strain rates. The nonlinear analysis of Koyna concrete dam under earthquake motions indicates that adding stiffness damp into the constitutive model can significantly enhance the calculation efficiency of the dynamic implicit analysis for greatly improving the numerical stability of the model. Considering strain rate effect in the model can affect the displacement reflection of this structure for slightly enhancing the displacement of the top, and can improve the calculation efficiency for greatly reducing the cost time.
QI Hu(齐虎)1, LI Yun-gui(李云贵)2, Lü Xi-lin(吕西林)1
(1. Institute of Building Structures, China Academy of Building Research, Beijing 100013, China;
2. China State Construction Engineering Co. Ltd., Beijing 100037, China;
3. Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China)
Abstract:The elasto-plastic damage model for concrete under static loading, previously proposed, was extended to account for the concrete strain-rate through viscous regularization of the evolution of the damage variables. In order to describe the energy dissipation by the motion of the structure under dynamic loading, a damping model which only includes stiffness damp stress was proposed and incorporated into the proposed rate dependent model to consider the energy dissipation at the material scale. The proposed model was developed in ABAQUS via UMAT and was verified by the simulations of concrete specimens under both tension and compression uniaxial loading at different strain rates. The nonlinear analysis of Koyna concrete dam under earthquake motions indicates that adding stiffness damp into the constitutive model can significantly enhance the calculation efficiency of the dynamic implicit analysis for greatly improving the numerical stability of the model. Considering strain rate effect in the model can affect the displacement reflection of this structure for slightly enhancing the displacement of the top, and can improve the calculation efficiency for greatly reducing the cost time.
Key words:stiffness damp; strain-rate sensitivity; concrete; constitutive model
