高拱坝流固耦合动力特性研究

高拱坝的动力特性分析是高坝抗震设计的重要内容。结合拉西瓦拱坝，考虑流固耦合作用及粘弹性边界影响，建立拱坝—地基—库水三维有限元模型，以研究库水对拱坝结构振动频率和振型的影响，借助反应谱理论对拱坝进行反应谱计算与分析。结果表明，坝体位移以顺河向为主，位移最大处出现在坝顶；坝体应力主要为拉应力，应力最大处出现在坝顶附近，计算结果与事实情况相符，符合拱坝震动的一般规律；在设计反应谱的振动作用下，该拱坝未出现大范围的破坏，满足《水工建筑物抗震设计规范》要求。

Dynamic Characteristics of Fluid solid Coupling for High Arch Dam

The dynamic characteristics analysis of high arch dam is an important part of high arch dam anti seismic design. Taking Laxiwa arch dam for an example, three dimensional finite element model of dam foundation water system is established by considering the effect of fluid solid coupling and viscous spring boundary. And the effect of reservoir water on the arch dam's frequencies and mode shapes is studied. Then, the response spectrum theory is used to calculate and analyze the arch dam's dynamic characteristics. The results show that the main direction of the dam's displacement is the cross river direction, and the maximum displacement is at the top of the dam; the main stress of the dam is tensile stress, and the maximum displacement is near the top of the dam; the calculation result is consistent with the general lows of arch dam vibration; under the vibration action of design response spectrum, the arch dam does not appear damage in the large range, which meets the requirements of the seismic design specification of hydraulic structure.