考虑土-结构相互作用的高层建筑横风向振动分析  

DYNAMIC RESPONSE ANALYSIS OF A HIGHRISE BUILDING SUBJECTED TO ACROSS-WIND LOAD CONSIDERING SOIL-STRUCTURE INTERACTION

作　　者：李安勇[1,2] 陈镕[1] 薛松涛[1,3] 唐和生[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092 [2]苏州科技大学土木学院,苏州215011 [3]日本近畿大学理工学部,日本大阪577-8502

出　　处：《振动与冲击》2008年第10期152-155,178,共5页Journal of Vibration and Shock

基　　金：建设部科技项目资助(04-2-042)

摘　　要：用由风洞试验得出的横风向荷载功率谱密度公式,推导出考虑结构-土相互作用(SSI)的横风向荷载功率谱密度和结构的频率响应函数矩阵公式,得到结构横风向风振响应计算公式。对超高层建筑横风向振动算例说明,考虑SSI后,房屋高度、土层的剪切波速和结构阻尼比的变化,对结构顶层的弹性位移、总位移和总加速度响应有不同影响,并指出不考虑SSI,高层建筑的横风向风振响应可能偏于不安全,因而对不同的响应类型,给出了不需考虑SSI的结构阻尼比取值范围的建议值。The power spectrum density(PSD) of across-wind load and the frequency response function of a highrise building considering soil-structure interaction(SSI) are deduced using the PSD of across-wind load from the wind tunnel test.The formula of the highrise building response to across-wind load is then derived using the random vibration theory.Numerical examples show that the height of the tall building,the shear wave speed of the soil and the damping ratio of the upper-structure have different effects on the elastic displacement,the total displacement and the total acceleration of the roof.Evaluation results also show that it is not always conservative to consider SSI in the analysis of the tall building response to across-wind.Some useful suggestions are given for different types of response.The range of the damping ratio of the upper-structure that does not need to consider SSI is proposed.

关 键 词：高层建筑 横风向 土-结构相互作用 荷载功率谱 风振响应 

分 类 号：TU311.3[建筑科学—结构工程]