高层建筑风荷载相干性研究  

Research on coherences of wind loads on tall buildings

作　　者：唐意[1] 严亚林[1] 金新阳[1] 

机构地区：[1]中国建筑科学研究院建研科技股份有限公司,北京100013

出　　处：《建筑结构》2011年第11期121-124,共4页Building Structure

基　　金：国家自然科学基金重大研究计划面上项目(90815015)

摘　　要：利用高层建筑刚性模型测压风洞试验结果,对顺风向风荷载竖向、水平相干性,迎背风面相干性以及横风向、扭转方向风荷载相干性的主要特征进行研究。利用算例说明了迎背风面相干性以及横-扭风荷载相干函数对于风振响应的影响。从计算结果来看,迎背风面全相干假定将使顺风向风振响应计算结果偏于保守;当结构刚心和质心偏离时,假定横扭风荷载相干性等于零会低估横风向和扭转方向风振响应。Several tall building models were tested in a wind tunnel for the wind pressures acting on the buildings.The vertical coherences of along-wind,across-wind and torsion wind loads and lateral coherences of along-wind load are analyzed in detail.Coherences between pressure on windward and leeward faces and between across-wind and torsion wind loads are researched.Then effects of the coherences on wind excited structural responses are studied.The results indicate,when the stiffness and mass centers deviate with each other,structural responses are underestimated without considering coherence between cross-wind and torsion wind loads.Full coherences assumption of the windward and leeward pressure may result in over-estimation of along-wind response.

关 键 词：高层建筑 顺风向风荷载 横风向风荷载 扭转风荷载 相干性 

分 类 号：TU312.1[建筑科学—结构工程] TU973