大跨度单层网壳结构风振响应的流固协同分析  

Fluid-Solid Cooperative Analysis on Wind-Induced Vibration of Long-Span Single Layer Latticed Structres

作　　者：卢旦[1] 李承铭[1] 田炜[1] 

机构地区：[1]上海现代建筑设计(集团)有限公司,上海200041

出　　处：《结构工程师》2007年第5期52-57,98,共7页Structural Engineers

摘　　要：风振计算是结构设计中的一项重要内容,该方法在进行复杂结构风振计算时的准确性值得商榷。利用风洞试验进行风振响应分析存在成本高、周期长、试验复杂等缺点。研究了运用计算流体动力学(Computational Fluid Dynam ic,CFD)中的非稳态计算,获取建筑物表面风荷载时程,通过网格数据插值,将风荷载直接作用于有限元模型的相应节点进行动力时程分析,提出了适合此类结构使用的风振系数简化计算公式。采用该方法对某一大跨单层悬索式网壳结构的风振响应进行了计算。结果表明,流体动力学与固体有限元程序之间的协同分析,不但支持不同软件不同节点之间的匹配,而且可以考虑自然风的时空相关性以及结构高阶振型的影响,更加精确地反映结构实际的风振情况。Wind vibration analysis is an essential task of structural design. The accuracy of this method is open to question, when applying to complex structures. Wind tunnel tests have their demerits of high cost, long process period, complexity and so on. In this paper, the unsteady calculation of CFD was used to obtain the wind load time history on structures. By data interpolating, the wind loads on nodes were directly applied on the finite element model to calculate the dynamic responses in time domain for wind load fact with a simplified calculating formula. Wind-induced vibrations of a long-span single layer latticed structure were studied using this method. The results show that this method can take into account spatial-temporal correlation of wind and higher modes influence, therefore, wind-induced vibration can be described more accurately.

关 键 词：风振计算 协同分析 CFD 有限元计算 时程分析 

分 类 号：TU399[建筑科学—结构工程] TU311.3