考虑土体结构相互作用的大型双曲冷却塔风致响应分析  

Wind-induced response of large hyperbolic cooling tower considering soil-structure interaction

作　　者：沈国辉[1] 王宁博 鲍侃袁[3] 孙炳楠[1] 楼文娟[1] 

机构地区：[1]浙江大学土木工程学系,杭州310058 [2]中国建筑西北设计研究院,西安710003 [3]浙江大学建筑设计研究院,杭州310027

出　　处：《空气动力学学报》2011年第6期777-783,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(50608063)

摘　　要：采用有限元方法模拟大型双曲冷却塔的土体与结构相互作用(SSI),分析不同土体条件下自振特性的特征,基于风洞试验结果进行风致响应的计算,并分析不同土体条件下响应的差别。研究表明:土体刚度越小,土体结构体系的自振频率也越小;土体对冷却塔上半部分的子午向薄膜力影响较小,对下半部分影响较大;考虑SSI效应后,平均风作用下冷却塔径向位移增大,子午向薄膜力减小,脉动风作用下径向位移均方根增大,子午向薄膜力均方根几乎不变。The finite element method is employed to study the Soil-Structure Interaction （SSI） on the large hyperbolic cooling tower. The vibration characteristics of the cooling tower under different soil conditions are investigated and the wind-induced responses based on the wind tunnel test results are calculated. Then the difference of responses considering different soil conditions is analyzed. Results from this study show that the vibration frequencies of the soilstructure system decrease when the stiffness of the soil decreases. The soil underneath the tower has insignificant influence on meridonial membrane forces for the upper part of the cooling tower, but has significant influence for the lower part of the tower. Under mean wind load action, the radial displacement of the cooling tower will increase and the meridonial membrane force will decrease when considering SSI. Under dynamic wind loads action, the Root-Mean-Square of radial displacements will increase and the Root-Mean-Square of meridonial membrane forces will keep mostly un- changed when considering SSI.

关 键 词：冷却塔 风荷载 有限元 结构土体相互作用 自振特性 

分 类 号：TU312.1[建筑科学—结构工程]