某大型博物馆结构风致响应分析

基于刚性模型风洞试验,对一个具有索网幕墙的新型杂交结构--某大型博物馆结构进行风致响应计算.在计算平均风响应时考虑结构几何非线性的影响;分析脉动风响应时将结构近似作为线性结构处理,采用平稳激励下随机振动的模态叠加法（CQC法）进行计算.计算结果表明,当关键点出现极大值响应时,平均风响应对峰值响应的贡献较大,而且动力响应中共振响应一般大于背景响应.此外,对于关键点竖向位移及结构支座竖向反力,主要是壳体悬挑部分的风荷载起作用;而索网面位移主要由索网面上的风荷载控制,悬挑部分的风压对其影响很小.

Wind-Induced Responses Analysis for a Large-Scale Museum Structure

Based on rigid model wind tunnel test,wind-induced responses of a neotype hybrid-structure with cable-net curtain walls(a large-scale museum structure) are computed.Effects of geometric nonlinearity are considered in calculating the mean responses,while the structure is regarded as a linear system and the mode-superposition method(CQC method) is adopted in computation of the dynamic responses.The computed results of some concerned responses show that the mean responses generally make more contributions to total responses than the dynamic responses,and furthermore the resonant components are larger than the corresponding background components in the dynamic responses when the maximum responses occur.Meanwhile,through analysis of structural responses subjected to wind loadings which are presumed to act on different parts of the roof,it is found that some concerned vertical displacements and vertical reaction forces of the corner supports are mainly controlled by the wind loadings on the surface of cantilevered roof,but the displacements of the cable-net are mainly controlled by those acting on the surface of cable-net itself.