风载作用下坝水流固耦合体系的动力响应分析

Analysis of Dynamic Response of Fluid-Structure Interaction System Under Wind Load

基于VOF方法,对地震和风共同作用下坝水流固耦合体系的动力响应进行了分析。针对空库、坝水相互作用和坝-水-风相互作用三种工况,计算分析了大坝在地震、风浪等作用下的动位移、绝对加速度及动水压力响应,同时通过对自由液面的追踪,验证了VOF方法追踪自由液面的优越性。结果表明:水与坝之间的动力相互作用是一种复杂的非线性过程;坝水相互作用能增大坝体振动的动位移和绝对加速度;风对大坝的动位移和绝对加速度基本没有影响,但风载荷对动水压力的影响极为显著。

The dynamic response of the dam-structure interaction system under the action of earthquake and wind was analyzed based on VOF method.Under the three working conditions of empty reservoir,dam-reservoir interaction,and dam-water-wind interaction,the dynamic displacement,absolute acceleration,and hydrodynamic response of the dam under the earthquake and wind load were calculated and analyzed.Meanwhile,the tracking of free surface based on VOF method verified its reliability and superiority.The results indicated that the interaction between the reservoir and dam is remarkably nonlinear.The dynamic displacement and absolute acceleration can be increased by the dam-water interaction.Furthermore,wind had no impacts on the dynamic displacement and absolute acceleration of the dam,but significant impacts on hydrodynamic pressure.