矩形渡槽流固耦合体系风致的动力性能

摘要

Based on rectangular aqueduct structures, the wind response of aqueduct-water coupling systems was studied by using the arbitrary Lagrangian-Eulerian (ALE) method. Three-dimensional model with fluid-structure interaction was established. The fluctuating wind speed time series was simulated with resorting to auto-regressive moving average (ARMA) model. The transversal displacement, the dynamic water pressure and the upsetting moment of aqueduct with different depth-width ratios were calculated in different water depth conditions under stochastic wind loads. The results show that the changing regularity of the wind-induced dynamic responses of aqueduct-water coupling systems with the change of water-depth is similar. The change of depth-width ratio greatly affects the vibration and stability of aqueduct in the same water condition, which should be paid more attention to in the wind-resistant design of aqueduct structure.%以排架矩形渡槽为研究对象,建立三维渡槽水流固耦合计算模型,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、不同渡槽截面高宽比,计算分析渡槽流固耦合体系在风荷载随机动力作用下的横向位移、倾覆力矩及动水压力.研究结果表明:不同高宽比的渡槽随着槽内水深的变化,其流固耦合体系风致动力性能的变化规律性相近；在等流量水深工况下,截面高宽比的变化对渡槽结构的振动和稳定性有显著影响,在渡槽抗风设计中应予以重视.