登陆台风场风速非平稳特性及其对高层建筑风振响应影响研究

STUDY ON NONSTATIONARY CHARACTERISTIC OF WIND SPEED IN LANDFALLING TYPHOON FIELDS AND ITS EFFECTS ON WIND-INDUCED RESPONSES OF HIGH-RISE BUILDINGS

  • 摘要: 为了研究登陆台风场实测风速的非平稳特性及其对典型高层建筑风致动力响应的影响规律,该研究利用五次登陆台风过程的实测风场数据,采用逆序检验法和轮次检验法对风速样本的非平稳性进行定性评估,对非平稳风速样本采用归一化局部递归率标准差(SDNLRR)进行非平稳度量化表征;基于不同非平稳度的脉动风速时程样本,采用希尔伯特-小波融合分解法进行风速场模拟重构;基于模拟重构的风速场对标准CAARC典型高层建筑模型进行时域风振响应分析,探究非平稳度对结构动力响应的影响规律。研究结果表明:台风场眼壁强风区的风速样本具有较强的非平稳特征;随着风速样本的非平稳度逐渐增大,结构顶点响应呈逐渐增大趋势,当SDNLRR由0.301增加至0.903时,结构顶点位移响应、速度响应和加速度响应的均值分别增加了17.9%、17.7%和47.6%;非平稳风速样本作用下的结构响应极值均高于依据《建筑结构荷载规范》计算的响应值。

     

    Abstract: This study investigates the impact of non-stationarity in typhoon wind fields on the wind-induced response of high-rise buildings. The reverse order inspection method and round inspection method were employed to select nonstationary wind speed samples qualitatively based on the measured data from five landing typhoons. The standard deviation of a normalized local recurrence rate (SDNLRR) was used to quantitatively calculate the non-stationarity of wind speed samples. Based on the fluctuating wind speed samples with different non-stationarity levels, Hilbert-Wavelet Packet Decomposition method was used to reconstruct the wind field. The response of a CAARC typical high-rise building model which induced by the simulated wind loads was analyzed to explore how non-stationarity affects structural dynamic responses. The study results indicate that the wind speed samples from the eyewall's strong wind region exhibit significant non-stationary characteristics. As the SDNLRR increases from 0.301 to 0.903, the average vertex displacement, velocity and acceleration of the structure increase by 17.9%, 17.7% and 47.6%, respectively. The extreme responses under non-stationary wind speed samples are larger than that calculated by the load code for the design of building structures.

     

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