中文摘要：

为了研究润扬大桥桥址区实测强风的非平稳特性,以＂麦莎＂和＂卡努＂台风为研究对象,采用多尺度小波变换方法提取了顺风向及横风向时变平均风速,并进一步计算了实测脉动风速的紊流强度、阵风因子、积分尺度和功率谱密度等非平稳风特性。在将非平稳风特性与平稳风特性进行对比的同时,重点对比分析了两台风非平稳风特性的异同点。结果表明：两实测台风的顺风向风速均表现出较强的非平稳性,横风向非平稳特性则相对较弱;平稳风速模型过高地估计了实测台风的紊流特性,致使其紊流强度值大于非平稳风速模型的计算结果;＂麦莎＂台风非平稳紊流强度顺、横风向比值大于1,而＂卡努＂台风的对应值小于1;两台风的实测非平稳风谱在低频段均小于Kaimal谱,在中高频段则较为吻合。

英文摘要：

In order to study the non-stationary characteristics of measured strong wind data of Runyang Suspension Bridge, typhoon Matsa and Khanun were taken as the research objects. The time-varying mean value of longitudinal and lateral wind speed was extracted by using the multi-scale wavelet transform method. The non-stationary wind characteristics such as turbulence intensity, gust factor, integral scale of turbulence and power spectrum density of the measured fluctuating wind speed were then calculated. The calculated results were compared with those stationary wind characteristics. Moreover, similarities and differences of non-stationary characteristics between the two typhoons were investigated. Results show that the longitudinal wind speed of the two measured typhoons exhibits strong non-stationary characteristics while the lateral one does not. The turbulence characteristics of the measured typhoons based on the stationary wind speed model are overvalued, which makes the turbulence intensities larger than those based on the non-stationary wind speed model. The ratios between the longitudinal and lateral turbulence intensity of typhoon Matsa are larger than 1, while those of typhoon Khanun are smaller than 1. The measured non-stationary wind spectrum of the two typhoons is smaller than Kaimal spectrum in low frequency, while it agrees well with Kaimal spectrum in mid-high frequency.