坝体-库水-地基流固耦合有限元分析的地基模拟
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摘要
为研究地基特性对坝体—库水—地基流固耦合的影响,以印度柯依那(Koyna)重力坝为例,采用ANSYS中的声学流体单元模拟库水,分别计算了地基为弹性、刚性时坝体在KOBE地震波作用下,典型时刻内库坝面上动水压力分布规律,以及坝顶上游侧水平和竖直位移的时程曲线,进行了模态分析并提取了前7阶频率。结果表明,地基特性对坝体—库水—地基流固耦合的影响非常大,不能简单地将地基视为刚性进行抗震设计。
In order to study the influence of foundation properties on the dam-reservoir-foundation of fluid-solid coupling,taking the Koyna gravity dam for an example,the acoustic fluid element in Ansys is used to simulate the reservoir water.Considering the elastic and rigid foundation under earthquake action of KOBE wave,this paper calculates the hydrodynamic pressure distribution rules of the dam surface in typical time,and the time history curves of the horizontal and vertical displacement of the upstream dam crest.And then the modal analysis is carried out to extract the first seven-order frequency.The results show that the influence of foundation properties on dam-reservoir-foundation fluid-solid coupling is obvious and it can not be simply regarded the foundation as rigid for seismic design.
In order to study the influence of foundation properties on the dam-reservoir-foundation of fluid-solid coupling,taking the Koyna gravity dam for an example,the acoustic fluid element in Ansys is used to simulate the reservoir water.Considering the elastic and rigid foundation under earthquake action of KOBE wave,this paper calculates the hydrodynamic pressure distribution rules of the dam surface in typical time,and the time history curves of the horizontal and vertical displacement of the upstream dam crest.And then the modal analysis is carried out to extract the first seven-order frequency.The results show that the influence of foundation properties on dam-reservoir-foundation fluid-solid coupling is obvious and it can not be simply regarded the foundation as rigid for seismic design.
引文
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[8]王新敏.Ansys工程结构数值分析[M].北京:人民交通出版社,2007.
[9]龚亚琦,苏海东,崔建华.坝体与库水的流固耦合分析[J].长江科学院院报,2011,28(6):63-66.
[2]高瑞强,宫必宁,郭建平.坝—水相互作用中水的压缩性影响研究[J].水利与建筑工程学报,2008,6(1):106-108.
[3]石建军,孙冰,周元德,等.不同横缝接触与库水模型对拱坝动力反应的影响[J].水力发电学报,2005,24(3):34-38.
[4]陈江,张少杰,闵兴鑫.坝体-库水相互作用的流固耦合分析[J].西南科技大学学报,2009,24(1):13-19.
[5]徐劲.混凝土大坝抗震数值分析理论与工程应用[M].北京:中国水利水电出版社,2007.
[6]黄耀英,孙大伟,田斌.两种库水附加质量模型的重力坝动力响应研究[J].人民长江,2009,40(7):64-66.
[7]杨吉新,张可,党慧慧.基于ANSYS的流固耦合动力分析方法[J].船海工程,2008,37(6):86-89.
[8]王新敏.Ansys工程结构数值分析[M].北京:人民交通出版社,2007.
[9]龚亚琦,苏海东,崔建华.坝体与库水的流固耦合分析[J].长江科学院院报,2011,28(6):63-66.
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