开孔结构屋盖风致响应的模态分析法  

Modal Analysis to Wind-Induced Response for Roof Structures with Wall Opening

作　　者：余世策[1] 楼文娟[1] 孙炳楠[1,2] 

机构地区：[1]浙江大学,杭州310027 [2]浙江大学宁波理工学院,宁波315100

出　　处：《应用力学学报》2009年第1期76-81,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50378085)

摘　　要：利用迭代算法推导了迎风面开孔结构屋盖风致响应的模态计算理论。在传统模态分析法的基础上考虑结构内压与屋盖的耦合作用,推出了模态空间不独立的频响函数矩阵来描述屋盖的风致响应特性,对一典型钢网架平屋盖风致位移响应和加速度响应在迎风面开孔影响下的变化进行了参数分析,并实施了气弹模型风洞试验对理论成果进行验证。研究结果表明,当开孔率足够大时考虑开孔后屋盖结构的风致响应会大幅增加,而随着来流风速的增加,屋盖风致响应的增幅与封闭式屋盖相比是减小的。Modal analysis method of wind-induced response for roof structures with windward opening is developed.Considering the coupling effect of internal pressure and roof,a new frequency response matrix is deduced to describe wind-induced response characteristic for roof structures with wall opening.Numeric examples are provided to evaluate the influence of internal pressure on wind-induced response of roof structures with windward opening and quantify analysis is presented for a typical steel grid roof structure.Wind tunnel tests for a roof structure model are conducted to verify the theories.It is shown that wind-induced response of roof structure increases greatly when the opening ratio is large enough and the amplify of response with increasing wind velocity may be decreased compared with closed type roof structures.

关 键 词：开孔结构 屋盖 风致响应 内压 模态法 开孔率 

分 类 号：TU311.2[建筑科学—结构工程]