大跨度组合网壳在台风作用下的风振响应分析  

Wind vibration response analysis of large-span composite reticulated shell under typhoon

作　　者：殷志祥[1] 徐佳萌[1] 

机构地区：[1]辽宁工程技术大学建筑与工程学院,辽宁阜新123000

出　　处：《建筑结构学报》2010年第S2期142-146,共5页Journal of Building Structures

摘　　要：台风风场下组合网壳结构的曲面形状和大空间特点使它的风振响应分析变得复杂,尤其在组合网壳的接合部位。基于台风脉动风的空间相关性,对一个两边半球形状,中间柱面形状的大跨度组合网壳进行了台风作用下的数值模拟,采用平稳高斯随机过程的谐波叠加法,并利用快速傅里叶变换,模拟得到组合网壳250个互相关的脉动风速时程样本。其中风速谱采用了随高度变化的田浦台风风速谱以及不随高度变化Davenport谱进行比较,得出组合网壳的台风敏感部位,并与基于FLUENT软件和计算流体力学(CFD)的数值风洞的模拟结果相比较,可以相互验证组合网壳在台风荷载作用下的响应结果。自功率谱的对比说明,模拟值和目标值吻合得很好,从而验证了计算结果的有效性与准确性。The composite reticulated shell has a curved shape and covers a large space,which complicates the wind-induced vibration response analysis under typhoon,especially at the interface of shell components.This paper considers the spatial correlation of the fluctuating wind in typhoon and performs numerical simulation of a large-span composite reticulated shell under the typhoon using harmonic superposition method of stationary Gaussian random process within fast Fourier transform.250 samples of time-pulse velocity were obtained,The paper uses Tianpu′s typhoon wind speed spectrum which changes with height and Davenport′s wind speed spectrum which does not change with height.Sensitive parts of composite reticulated shell are identified under the typhoon.Simulation results can be compared with the results of numerical wind tunnel based on FLUENT software and computational fluid dynamics(CFD).A comparison with the power spectrum results shows that the simulated results and the target results are in good agreement,thus verifying the validity and accuracy of this calculation.

关 键 词：大跨度组合网壳 谐波叠加法 台风风速谱 快速傅里叶变换 计算流体力学 

分 类 号：TU312.1[建筑科学—结构工程]