拱坝非线性地震反应分析

The nonlinear seismic response analysis of arch dam

以乌东德拱坝为对象,进行了拱坝非线性地震反应分析。结果表明:坝体损伤区域明显大于坝体混凝土按线弹性材料计算时最大主应力超过抗拉强度的区域,说明传统方法低估了拱坝的开裂范围,偏于危险;考虑基岩的非线性后,坝体损伤总体上要有所减小;坝基岩体剪胀角对坝基岩体的屈服和坝体混凝土的损伤都有影响,但是规律不明确,因此应该进行基岩剪胀角的敏感性分析。

The nonlinear seismic response analysis of Wudongde arch dam is reported in the paper.Results show that the simulated dam damage area is significantly greater than the area where the dam maximum principal stress exceeds the dam tensile strength by treating the arch dam as the traditional linear elastic material model.Therefore,the traditional method underestimates the arch dam cracking area and its danger.The dam overall damage is reduced after considering the nonlinear of bedrock.The dam foundation rock＇s dilatancy angle has effect on the yield of the dam foundation rock and the damage to the dam concrete.However,the changing law is not clear,therefore,the sensitivity analysis of the bedrock＇s dilatancy angle should be conducted.