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采用超声风速仪与加速度传感器,对台风“梅花”作用下中国航海博物馆周围风场及双曲面索网结构风振响应进行现场实测,对脉动风速的概率密度分布、湍流度、阵风因子、湍流积分尺度、风速功率谱等风场特性及加速度概率密度分布、反应谱、结构自振频率、阻尼比、振型等风振特性进行研究.结果表明:脉动风速的概率密度分布符合高斯分布;湍流度和阵风因子随平均风速的增大而减小;顺风向、横风向、竖向脉动风速影响下顺风向湍流积分尺度平均值的比值为12.1∶3.4∶1.0,湍流积分尺度与平均风速相关性较小,随湍流度的增大而减小;实测脉动风速谱与Von Karman谱较为吻合;风振具有较强的非高斯性,随振幅阈值的增长,阻尼比的变化可分为线性递增段和平稳段,利用谱分析法、随机减量法、随机子空间法等方法计算得到的自振频率较为一致.
Wind speed response of wind field and hyperbolic cable network around China Maritime Museum under the action of typhoon “plum ” was measured on site by ultrasonic anemometer and accelerometer. The probability density distribution, turbulence degree, gust factor, Turbulence integral scale, wind power spectrum and other wind field characteristics and acceleration probability density distribution, response spectrum, natural frequency of structure, damping ratio and vibration mode were studied.The results show that the probability density distribution of pulsating wind speed conforms to Gaussian distribution, Turbulence and gust factor decreased with the increase of average wind speed. The mean value of downwind turbulence integral scale was 12.1: 3.4: 1.0 under the effects of downwind, transverse wind and vertical fluctuating wind speed, and the turbulence integral scale was related to the average wind speed The results show that the wind-induced vibration has a strong non-Gaussianity, and the change of damping ratio can be divided into linear increase with increasing amplitude threshold The frequency of natural vibration calculated by the method of spectral analysis, random reduction and random subspace method is consistent.