基于动力子模型法的混凝土重力坝动力损伤分析

Dynamic Damage Analysis of Concrete Gravity Dam Based on Dynamic Submodel Method

针对混凝土重力坝抗震分析中因工程结构、荷载复杂性所造成的建模、计算及后处理难的问题,将常规子模型法拓展应用于重力坝动力分析中,并结合混凝土塑性损伤模型进行多级子模型计算。应用算例验证了该方法的可靠性和精确性,以观音岩水电站工程为例,采用人工边界的初始全局模型后,将其坝基结果施加于坝体子模型上,根据坝体的损伤区域对顶部廊道部分进行二级子模型计算,得到了满足工程应用的分析结果。

Aiming at the difficulties of modeling, calculation and post-processing caused by engineering structure and complex load in anti-seismic analysis of concrete gravity dam, the conventional submodel method is used to dynamic anal- ysis of concrete gravity dam. And the multi level submodel calculation is carried out based on the damaged concrete plas- ticity model. The reliability and correctness of the method is verified by example. Taking Guanyinyan hydropower station for an example, the seismic wave acceleration time-histories which was attained through the global model analysis under the artificial viscoelasticity boundary was applied to the monolith submodel boundary of the concrete gravity dam to obtain the tensile damage zone. Finally, the submodel of dam top gallery was analyzed to figure out seismic response, which could satisfy the engineering needs.