考虑非线性振型的顺风向广义气动力谱  

The Influence of Nonlinear Mode on Generalized Aerodynamic Spectrum in the Downwind

作　　者：李阳阳 李建成[2] 冯松宝 孙磊 麻洪蕊 张萍花 LI Yangyang;LI Jiancheng;FENG Songbao;SUN Lei;MA Hongrui;ZHANG Pinghua(School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,China;Key Laboratory of Building Safety and Energy Efficiency of Hunan University,Changsha 410082,China)

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000 [2]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《信阳师范学院学报（自然科学版）》2018年第4期693-697,共5页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51178179);安徽省优秀青年人才项目(gxfxzd2016259);宿州学院教授(博士)研究项目(2016jb05);宿州学院科研平台开放课题(2017ykf13);宿州学院重点科研项目(2017yzd12);宿州区域发展协同创新中心全国开放课题项目(2014SZXTKF07)

摘　　要：在顺风向,结合脉动风荷载相干函数、平均风速剖面指数和振型指数,采用数值积分的方法得出了非线性振型对高层建筑广义气动力谱的数值,并通过多元线性回归分析推导出了该数值的拟合公式,以及通过风洞试验证实了该公式的可靠性.以振型指数为参数,讨论了非线性振型对高层建筑广义气动力谱的影响:当振型指数小于1时,修正系数大于1,即以传统方法计算得出的广义气动力谱是偏小的,此时对结构设计而言是偏于不安全的;反之则小于1.基于线性振型计算得到的广义气动力谱,当采用建筑结构荷载规范的基本振型时,建议采用1.1的修正系数进行修正.Combined with the coherence function of fluctuating wind load,the average wind speed profile index and the mode index,the method of numerical integration was used to calculate the generalized aerodynamic spectrum of nonlinear modes for high-rise buildings in the downwind.The fitting formula for that value was derived by multivariate linear regression analysis,whose reliability was confirmed by the wind tunnel test.At the same time,the effect of nonlinear vibration modes on the generalized aerodynamic spectrum of high-rise buildings was discussed with the vibration index as the parameters:When the vibration mode index is less than 1,the correction coefficient is more than 1,that is,the calculated generalized aerodynamic force spectrum by the traditional method is too small,which is not safe for the structural design,and on the contrary,it is less than 1.Base on the generalized aerodynamic spectrum of the linear mode,it is recommended to use a correction factor of 1.1 in the basic mode of the load code for the design of building structures.

关 键 词：广义气动力谱 非线性振型 顺风向 风洞实验 

分 类 号：TU973.213[建筑科学—结构工程]