【摘要】 以排架渡槽为研究对象,分别建立考虑土-结构相互作用(SSI)效应和不考虑土-结构相互作用(SSI)效应下的三维渡槽-水流固耦合体风振计算模型,通过自回归滑动平均(ARMA)模型模拟脉动风,采用任意拉格朗日-欧拉(ALE)方法求解渡槽和水体的耦合相互作用问题,针对不同水深工况,分别计算分析渡槽流固耦合体系在风荷载随机动力作用下的动力响应。研究结果表明:考虑SSI效应使得渡槽结构横槽向抗风刚度降低,导致结构风振位移响应增大;渡槽结构各部位最大主应力随槽内水深增大而增大,考虑SSI效应渡槽结构主应力稍大于不考虑SSI效应渡槽结构主应力;在脉动风荷载作用下,水深是决定渡槽倾覆力矩和动水压力的控制因素,土-结构作用的影响较小。更多还原

【Abstract】 Three-dimensional models of fluid-structure coupling system for bent-type aqueduct were established considering soil-structure interaction(SSI) and without considering soil-structure interaction respectively to simulate the wind-induced vibration response. The wind-induced vibration response of aqueduct-water coupling system was numerically computed by using the arbitrary Lagrangian-Eulerian(ALE) method. The fluctuating wind speed time series was simulated resorting to auto-regressive moving average(ARMA) model. The dynamic responses of fluid-structure interaction system with different water depth conditions under stochastic wind loads were calculated. The results show that as SSI is considered, the lateral wind stiffness of the aqueduct structure decreases, which results in the increase of the structural wind-induced vibration displacement responses. The maximum principal stress of the aqueduct structure increases with the increase of the water depth, and the principal stress of the aqueduct considering SSI is slightly greater than that of the aqueduct without considering SSI. Under the action of fluctuating wind loads, the water depth controls the overturning moment and dynamic water pressure of the structure, while the effect of soil-structure interaction on the structure is weaker.更多还原