Damage mechanism and fracture process of concrete gravity dam under earthquake action

摘要

Based on plastic-damage constitutive model of concrete,the developing process of damage domains is simulated for the earthquake analysis of concrete dam by taking account of the change of strain speed and stiffness degradation effect caused by material damage.The plastic-damage constitutive model is applied and the dam-reservoir dynamic interaction resulting from the transverse component of ground motion is modeled using the developed and generalized Westergaard formula added mass technique.Numerical simulation results show that the damaged domains mainly distribute at the change in geometry of upper part of the dam and vertical construction joints.The damaged domains of dam are same as the maximum tensile stress because the tensile strength of concrete is less its compress strength.