摘要
对山脉型空间膜结构进行数值模拟与比较分析,研究膜帽处开敞与封闭情形、不同风速情形下的膜结构风振响应,包括位移响应、速度响应、加速度响应等.研究显示,膜帽开敞、封闭与否对结构最大位移响应影响较小;结构在膜结构顶帽封闭情形下的最大加速度响应明显大于膜结构顶帽开敞情形;位移瞬态放大系数在膜帽开敞情形下大于封闭情形.在一定风速范围内,开敞情形下结构竖向最大位移响应随风速增大而增大,而结构位移的瞬态放大系数随着风速增大变化不明显.文中的研究成果可供膜结构工程抗风设计参考.
The numerical simulations of the wind-induced responses of the spatial membrane structures with mountain-like shape were investigated.The wind-induced responses of the structure such as displacement,velocity and acceleration were numerically evaluated by considering various coming wind velocity and open-/closed-type topping caps.The obtained results show that the maximum structural displacements caused by the wind are almost identical for both structural systems with open-type and closed-type topping caps.For the structure with closed-type topping cap,the maximum acceleration is greater than that of the one with open-type one,whereas its transient amplification coefficient of structural displacement is smaller.With the increased wind velocity that falls within a certain range,it is also found that the vertical displacements of the structure with open-type topping cap increase while its transient amplification coefficient changes little.The current investigation in brief will be helpful for the wind-resistance design of this kind of spatial membrane structure.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2012年第10期1587-1593,共7页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金项目(51078230
11172174)
上海市基础研究重点项目(10JC1407900)资助
关键词
膜结构
流固耦合
风致动力响应
位移瞬态放大系数
membrane structure
fluid-structure interaction
wind-induced responses
transient amplification coefficient of structural displacement
