高拱坝流固耦合动力特性研究
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摘要
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。
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.
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.
引文
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[2]罗学海,朱葳,黄万春,等.恒山拱坝原型振动实验[J].水力发电,1981(6):53-57.
[3]赵兰浩,李同春,牛志伟.考虑库水可压缩性的高拱坝动力特性分析[J].水电能源科学,2008,26(3):95-97.
[4]裴镔.Hardfill坝地震动力响应的比较分析[J].水电能源科学,2010,28(2):85-88.
[5]张辉东,周颖.大型水电站厂房结构流固耦合振动特性研究[J].水力发电学报,2007,26(5):134-137,111.
[6]张传国.Ansys在混凝土重力坝振型分解反应谱分析中的应用[J].云南水力发电,2009,25(6):24-27,46.
[7]杜兴华,高扬.粘弹性人工边界在有限元分析中的应用[J].低温建筑技术,2012(1):76-78.
[8]龚亚琦,陈琴,崔建华,等.坝体—地基—库水体系的动力有限元分析及其应用[J].水电能源科学,2012,30(1):40-44.
[9]中国水利水电科学研究院.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国电力出版社,2001.
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