中文摘要：

对于桥梁断面，已有的风洞试验结果表明，抖振力的跨向相关性大于脉动风的相关性。由于风洞尺寸和模型尺度的限制，这些试验结论是在跨向间距较小和被动模拟紊流场条件下取得的。为了进一步研究较大的跨向间距内以及不同紊流场中抖振力的跨向相关性，以抖振升力为例，利用理论分析方法建立了合理的数学模型，并深入研究了风洞模拟风谱以及自然大气风谱下抖振力的跨向相关性与脉动风速相关性的差异。结果表明，在风洞模拟紊流场中，抖振力的跨向相关性大于脉动风的相关性仅在一定的跨向间距内成立；而在自然大气紊流场中，抖振力的跨向相关性则介于纵向脉动风与竖向脉动风的相关性之间。最后，利用Davenport提出的相干函数经验公式计算了自然大气紊流场中抖振力的相关性，通过对比验证了方法的有效性。

英文摘要：

Results of previous wind tunnel testing have shown that the span-wise correlation of the buffeting force on bridge deck is greater than that of the turbulent components. Due to the limitation of wind tunnel size and model scale, above-mentioned results were usually obtained for smaller separation along the span and the turbulent flow was generated by passive method. In order to study of the span-wise correlation of the buffeting force with large separation and different turbulent flow field, thorouphty lift buffeting force is taken for instance in this paper. Theoretical analysis method is employed to establish a reasonable mathematic model, and then the difference of the span-wise correlation between buffeting force and wind fluctuations was investigated by means of the wind spectra simkulation in wind tunnel and in natural atmosphere, respectively. The buffeting force that better correlated span-wise than the wind fluctuations applies only to certain interval in turbulent flow simulated in wind tunnel, while as in the natural atmospheric turbulent field, the correlation of buffeting ~orce is between the longitudinal and vertical oncoming flow fluctuations. Finally, the empirical coherence function proposed by Davenport is employed to verify the validity of the analysis method.