矩形截面高层建筑横向风激励时程模拟  

Simulation of across-wind fluctuating excitation for rectangular high-rise buildings

作　　者：孙业华 宋固全[1] 廖伟盛 胡淑军[1] Sun Yehua;Song Guquan;Liao Weisheng;Hu Shujun(School of Civil Engineering and Arehiteeture,Nanchang University,330033,Nanchang,China)

机构地区：[1]南昌大学建筑工程学院,南昌330033

出　　处：《应用力学学报》2018年第6期1346-1352,1426,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51469016)

摘　　要：提出了一种改进的矩形高层建筑横风向脉动激励模拟方法。从牛顿第二定理出发,将沿建筑高度分布的横风向加速度和楼层质量转化为沿楼层高度分布的横风向惯性力计算公式;考虑横风向力谱竖向相干函数,由此导出了沿建筑高度方向分布的横风向脉动力互谱,进而采取谐波合成法模拟出了沿建筑高度分布的横风向脉动力时程数据。结果表明:横风向振动响应与结构固有频率相关,结构前2阶模态频率所对应的横风向加速度响应功率谱约占80%,且第2阶模态频率占主导;当在结构2/3高度增加粘滞阻尼器时,第2阶模态频率所对应的结构加速度功率谱值降低约为43.1%,减震效果明显。因此,结构横风向加速度分析至少考虑前2阶模态的影响。An improved simulation method of across-wind fluctuating excitation has been studied for rectangular high-rise buildings.Firstly,across-wind inertia force has been formulated between the across-wind acceleration and floor mass distributed along structure height based on Newton's second theorem,and the coherence function for across-wind force spectrum is considerably adapted,then the cross spectrum of across-wind force is theoretically deduced.Secondly,across-wind induced excitations along structure height have been generated by weighted amplitude wave superposition method.Research results show that the structural dynamic response is related to the natural frequencies of the structure.For a typical case,the transverse wind acceleration power spectrum of the first two modes is about 80%,and the second order frequency dominant the contribution.Furthermore,vibration control of the case is analyzed when the viscous dampers are introduced in the structure.The peak of frequency power spectrum corresponding to the second mode decreases distinctly with viscous dampers device for high-rise buildings.The first two modes or high modes must be considered when calculating the across-wind acceleration. The findings of current work are of use and interest to researcher and designers involved in the wind-resistant design of high-rise buildings to nonlinear analysis and vibration control.

关 键 词：高层建筑 谐波合成法 横风向风力时程 粘滞阻尼器 动力响应 

分 类 号：TU973.213[建筑科学—结构工程]