【摘要】 基于浙江温州市区某方形高层建筑在不同台风下原型实测数据,应用单输入多输出的ERA-NExT理论方法,对影响气动阻尼比的诸多因素进行综合对比分析研究。结果表明:随着平均风速的增加,速度、加速度均方根也沿着幂函数增加;在小折减风速范围内(小于1. 0),气动阻尼比与折减风速、加速度(速度)均方根与幅值比值的关系也不是纯粹单调的,而是分区间增减变化,虽然四个台风的区间范围稍有不同,但变化规律却比较相似,而且其曲线数值大小的排列与风向角大小具相关性; X,Y向气动阻尼比与结构加速度功率谱幅值的关系具有相似规律。更多还原

【Abstract】 Based on the actual measured data of a certain square high-rise building in Wenzhou,Zhejiang Province under different typhoons,multiple factors affecting the building’s aerodynamic damping ratio were comprehensively and contrastively analyzed using the SIMO ERA-NExT theoretical method. The results showed that with increase in the mean wind velocity,RMSs of the building’s vibration velocity and acceleration increase along a power function curve; within a small reduced wind speed range( < 1. 0),changes of the building’s aerodynamic damping ratio versus reduced wind velocity,and RMSs of structural vibration velocity and acceleration are not pure monotonous but piecewise; the change laws of the aerodynamic damping ratio under four typhoons are similar,the numerical value arrangement of their curves is related to the wind direction angle; the relation between the structural vibration acceleration power spectral amplitude and the aerodynamic damping ratio in X direction and that in Y direction have a similar law.更多还原