中文摘要：

针对扁平箱形断面梁，在均匀流场中进行了涡激振动节段模型风洞试验，研究了扁平箱梁涡激力的展向相关性。结果显示：在涡振锁定区的振幅下降阶段，升力的展向相关性随着振幅的减小而减弱；在涡振锁定区的振幅上升阶段，升力的展向相关性随着振幅的增大先增强后减弱，升力展向相关系数的最大值出现在振幅上升阶段的某个风速，而不是最大振幅对应的风速；均匀流场条件下，在涡振锁定区内，扁平箱梁涡激力的展向相关性不仅与振幅有关，也与来流风速值有关。

英文摘要：

A sectional model wind tunnel test of a flat box girder in smooth flow was performed and the spanwise correlation of vortex-induced forces was investigated. The study results show that spanwise correlation of lift force becomes weakened with the decrease of vibration amplitudes at vibration amplitude-decreasing stage in lock-in range. At vibration amplitude-increasing stage in lock-in range, with the increase of vibration amplitudes, spanwise correlation of lift force becomes strengthened first and then weakened. The maximum value of spanwise correlation coefficient appears in a wind speed in vibration amplitude-increasing stage, rather than the wind speed corresponding to maximum vibration amplitude; In lock-in range, spanwise correlation of vortex-induced forces of flat box girder is dependent on both vibration amplitude and wind speed in smooth flow.