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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 analysis of high arch dam is an important part of seismic design of high dam. Combined with the Laxiwa arch dam, the three-dimensional finite element model of arch dam-foundation-reservoir was established to consider the influence of reservoir water on the vibration frequency and mode shape of arch dam, considering the fluid-structure interaction and viscoelastic boundary influence. Theoretical Calculation and Analysis of Arch Dam Response Spectrum. The results show that the displacement of the dam is mainly along the river and the displacement is at the top of the crest. The stress of the dam is mainly tensile stress, and the maximum stress appears near the crest. The calculation results are consistent with the fact and in line with the vibration of the arch dam General rule. Under the vibration of design response spectrum, the arch dam does not appear a wide range of damage, and meets the requirements of Code for Seismic Design of Hydraulic Structures.