矩形高层建筑风致脉动扭矩时程模拟  

Simulation of wind-induced fluctuating torque for rectangular high-rise buildings

作　　者：孙业华 宋固全[1] Sun Yehua;Song Guquan(School of Civil Engineering and Architecture,Nanchang University,330033,Nanchang,China)

机构地区：[1]南昌大学建筑工程学院

出　　处：《应用力学学报》2019年第6期1457-1463,I0013,I0014,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51469016)

摘　　要：提出了一种矩形高层建筑脉动扭矩时程模拟方法,利用广义牛顿第二定律将建筑层间转动惯量和扭转角加速度谱转化成层间扭矩功率谱,结合扭矩竖向相干函数,推导出了扭矩互谱密度函数;采用谐波合成法模拟出沿楼层高度分布的脉动扭矩时程。在时域内对高层建筑扭转向进行了风振分析,结果表明,建筑顶部扭转角加速度略大于UND(美国圣母大学)空气动力数据库结果,平均偏差约为11%,两者在统计意义上基本一致。A simulation method of torsional fluctuating excitation has been presented for rectangular high-rise buildings. Firstly, interlayer torque power spectrum is formulated between the torsional angular acceleration androtary inertia distributed along structure height based on generalized Newton’s second theorem, and the coherence function for torque power spectrum is considerably adapted, and then the cross spectrum of torque is theoretically deduced. Secondly, torsional induced excitations along structure height are generated by Weighted Amplitude Wave Superposition method. Then, wind-induced torsional vibration analysis for high-rise buildings is conducted in time domain. Research results show that the RMS of the torsional angular acceleration at the top is slightly larger than that of the UND aerodynamic database, with an average deviation of about 11%, which is basically consistent in statistical sense. 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 脉动扭矩 扭转角加速度 时域法 

分 类 号：TU973[建筑科学—结构工程]