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为了定量反映混凝土重力坝地震破坏程度,进行基于功能的重力坝抗震设计,建立了一种地震破坏评价模型。基于线弹性模型,分析了混凝土重力坝在地震作用下的需求能力比、超应力累积持时,并在弹塑性损伤力学的基础上分析了损伤区长度、位置及损伤因子,建立了重力坝地震破坏评价模型。通过印度K oyna重力坝典型地震破坏事例分析,模型计算的损伤指标(DM)值均大于0.6,属于严重损伤破坏,验证了该模型的合理性。因此,该模型可以定量评估重力坝震后的破坏状态。
In order to quantitatively reflect the degree of earthquake damage to concrete gravity dam, a function-based seismic design of gravity dam is presented and a seismic damage evaluation model is established. Based on the linear elastic model, the demand-capacity ratio and the cumulative over-stress of concrete gravity dam are analyzed. Based on the elasto-plastic damage mechanics, the length, position and damage factor of the damaged zone are analyzed. The gravity dam Destruction evaluation model. Through the analysis of the typical earthquake damage of the Koyna gravity dam in India, the damage index (DM) values calculated by the model are all greater than 0.6, which are serious damage and damage. The rationality of the model is verified. Therefore, the model can quantitatively evaluate the damage status of gravity dam after earthquakes.