扁平箱梁涡激力的展向相关特性研究  

STUDY ON SPANWISE CORRELATION OF VORTEX-INDUCED FORCES ON A FLAT BOX GIRDER

作　　者：刘小兵[1,2] 张海东[1] 王彦彪[1] 

机构地区：[1]石家庄铁道大学风工程研究中心,石家庄050043 [2]河北省大型结构健康诊断与控制重点实验室,石家庄050043

出　　处：《工程力学》2016年第B06期239-243,250,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(51308359);河北省自然科学基金项目(E2013210103);河北省高等学校科学技术研究基金项目(QN20131169)

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。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.

关 键 词：涡激力 展向相关性 扁平箱梁 节段模型 风洞试验 

分 类 号：TU311.3[建筑科学—结构工程]