【摘要】 考虑了混凝土拉压异性损伤变量,根据相关流动法则推导了混凝土的损伤本构方程。通过有限元方法模拟坝体在地震激励下的非线性损伤演化过程,数值计算过程中考虑了库坝动力耦合及混凝土后继屈服的强化效应,采用四参数O ttosen屈服准则及相应的损伤型本构,算例验证了Koyna混凝土重力坝在竖向和横向实测地震激励下的非线性损伤响应特性。更多还原

【Abstract】 Damage varible is considered due to difference of tension and compression of concrete.According to the associated flow rule the damage constitutive formulation is deduced.By finite element method(FEM),the plastic damage mechanical model is used to simulate nonlinear damage evolution of a Koyna concrete gravity dam subjected seismic excitations with hydrodynamic interaction between the dam and the reservoir.The strengthening effects of the postyielding of concrete,and the modified four-parameter Ottosen-type yielding criterion combined with the drivative constitutive relationship are taken in account. Examples show that the nonlinear seismic damage response characteristics of the Koyna dam subjected to the horizontal and vertical seismic waves are verified.更多还原