Wang Xu, Zhang Guoliang, Li Yongguang, Kong Hu, Liu Lang, Zhang Cheng
State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400041, China.
Sensors (Basel). 2023 Jul 19;23(14):6519. doi: 10.3390/s23146519.
In this paper, the wind-induced responses of the Shanghai World Financial Center (SWFC) under Super Typhoon Lekima are measured using the health monitoring system. Based on the measurements, the characteristics of vibration, including probability density distribution of accelerations, power spectra, and mode shapes are studied. The curve method and the standard deviation method are used to analyze the relationship of the first- and second-order natural frequencies and damping ratios with amplitudes and the mean wind speed. The results show the following: (1) The structural wind-induced responses in the X and Y directions have high consistencies, and the vibration signals exhibit a peak state; moreover, response amplitudes and acceleration signals disperse when the floor height increases. (2) The first- and second-order natural frequencies in the X and Y directions decrease with the increasing amplitudes and are negatively correlated with mean wind speed; the maximum decrease in natural frequency is 5.794%. The first- and second-order damping ratios in the X and Y directions increase with the increasing amplitudes and are positively correlated with the mean wind speed; the maximum increase in damping ratio is 95.7%. (3) The curve method and the standard deviation method are similar in identifying dynamic characteristic parameters, but the discreteness of the natural frequencies obtained by the curve method is lesser. (4) Under excitations of various typhoons, the mode shapes of SWFC are basically the same, and the mode shapes in the X and Y directions increase with the height and have nonlinearity.
本文利用健康监测系统测量了上海环球金融中心（SWFC）在超强台风“利奇马”作用下的风致响应。基于测量结果，研究了振动特性，包括加速度概率密度分布、功率谱和振型。采用曲线法和标准差法分析了一阶和二阶固有频率及阻尼比与振幅和平均风速的关系。结果表明：（1）结构在X和Y方向的风致响应具有高度一致性，振动信号呈现峰值状态；此外，随着楼层高度增加，响应振幅和加速度信号分散。（2）X和Y方向的一阶和二阶固有频率随振幅增加而降低，与平均风速呈负相关；固有频率最大降幅为5.794%。X和Y方向的一阶和二阶阻尼比随振幅增加而增大，与平均风速呈正相关；阻尼比最大增幅为95.7%。（3）曲线法和标准差法在识别动力特性参数方面相似，但曲线法得到的固有频率离散性较小。（4）在各种台风激励下，上海环球金融中心的振型基本相同，X和Y方向的振型随高度增加且具有非线性。
