考虑流固耦合效应的鞍形索膜结构体表风压和风致响应

Wind Pressures and Wind-Induced Dynamic Response of Tension Structure Subjected to Fluid-Structure Interaction

基于Menter SST湍流模式和非线性有限元理论,在任意拉格朗日-欧拉(Arbitrary La-grangian-Eulerian,ALE)描述下,构建了耦合方程迭代求解策略.针对鞍形索膜结构与柔性屋面、刚性屋面等的力学模型不同,在底裙封闭、底裙开敞等不同工况条件下,数值模拟和分析比较了结构体表风压分布和结构风致响应.计算结果表明,鞍形索膜结构为底裙封闭时,刚、柔性屋面工况的膜面风压分布存在明显差异;对于柔性鞍形索膜结构,底裙开敞工况的结构风致响应明显大于底裙封闭工况,相应的膜面风压分布、位移分布和有效应力分布均与底裙封闭工况差异明显.

Under the Arbitrary Lagrangian-Eulerian description, the iterative solution strategy for fluidstructure coupled interaction system was put forward, based on Menter SST vortex model and nonlinear finite element theory. With the consideration of different circumstances such as both stiffness and flexible structural models as well as both the open-type and enclosed-type cases at the lower parts of structural system, the wind pressure distribution on the structural surfaces and wind-induced dynamic responses of saddle-shape tension structure subjected to fluid-structure interaction were investigated numerically. The results show that, under the enclosed-type case of the lower parts of structural system, there is obvious difference of wind pressure distribution on the structural surface between the stiffness model and flexible structural model. Besides, for the flexible saddle-shape tension structure, the structural wind-induced response under the open-type case is greater than that under the enclosed-type case.