渡槽结构考虑流固耦合的地震动力反应分析

渡槽这种重要的输水结构,顶部质量大。地震作用下,水体采用附加质量法计算,不能反映水体与结构的相互作用。该文采用有限元模拟水体及结构,地震波采取一致和多点输入,考虑渡槽内水体的大幅晃动,计算结果表明,结构与流体之间的相互作用就会使结构产生类似于TLD(调谐液体阻尼器)的效应,消减地震作用,减少结构的最大位移。因此,渡槽地震反应分析时,槽内水体的耦合作用是不可以忽视的。

Aqueduct,as a kind of water transport structures,has a massive top.Under the action of earthquake,the water body is calculated by the additional mass method,which can not reflect the interaction between water body and structure.In this paper,the finite element method is used to simulate the water body and the structure.The seismic wave is consistent and multi-point input,and the large sloshing of the water body in the aqueduct is taken into account.The calculation results show that the interaction between the structure and the fluid will make the structure produce an effect similar to TLD(tuned liquid damper),reduce the seismic action and reduce the maximum displacement of the structure.Therefore,in the seismic response analysis of the aqueduct,the coupling effect of the water body in the aqueduct can not be ignored.