流线型箱梁涡激共振响应模型尺寸效应  

Model Size Effects on Vortex-induced Vibration Responses of a Streamlined Box Girder

作　　者：刘志文[1,2] 林子楠 邵超逸 黎晓刚 周登燕[4] 陈政清[1,2] LIU Zhiwen;LIN Zinan;SHAO Chaoyi;LI Xiaogang;ZHOU Dengyan;CHEN Zhengqing(Key Laboratory for Wind&Bridge Engineering of Hunan Province(Hunan University),Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China;Guangzhou Expressway Co.,Ltd,Guangzhou 512090,China;CCCC Highway Consultants Co.,Ltd,Beijing,100120,China)

机构地区：[1]风工程与桥梁工程湖南省重点实验室(湖南大学),湖南长沙410082 [2]湖南大学土木工程学院,湖南长沙410082 [3]广州市高速公路有限公司,广东广州512090 [4]中交公路规划设计院有限公司,北京100120

出　　处：《湖南大学学报（自然科学版）》2023年第1期109-118,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51778225,52178475)。

摘　　要：针对闭口流线型钢箱梁涡激共振响应风洞试验研究中存在的尺寸效应问题,依托广东南沙至中山高速公路洪奇门特大桥,采用风洞试验和计算流体动力学相结合的方法进行研究.首先分析了两种几何缩尺比下闭口流线型箱梁节段模型风洞试验中涡激共振响应的差异;然后,采用流固耦合数值模拟方法计算了不同缩尺比闭口流线型箱梁断面涡振响应.结果表明:闭口流线型钢箱梁涡激共振响应存在明显的模型尺寸效应,表现为常规比例(λ_(L)=1/60)主梁节段模型涡振振幅大于大比例(λ_(L)=1/30)主梁节段模型涡振振幅;二维数值模拟计算得到的涡激共振响应锁定风速区间、振幅与风洞试验结果吻合较好,验证了数值模拟方法的精度,同时也表明模型长宽比及试验阻塞率的差异不是闭口流线形箱梁涡激共振尺寸效应的主要影响因素;随着主梁断面模型缩尺比的增大,其涡激共振响应总体呈现下降趋势,且不同缩尺比下主梁断面静态绕流流场的涡脱频率分布存在显著差异.Aiming at the problem of model size effects on vortex-induced vibration(VIV)of the streamlined closed-box steel girders,based on the Hongqimen Bridge(HQMB)of Nansha to Zhongshan highway,the combination method of wind tunnel tests and computational fluid dynamics is applied to carry out the investigations.Firstly,the wind tunnel experimental investigations on VIV responses of the streamlined closed-box girder segment models with two different geometric scales were conducted.Then,the numerical simulations of the fluid-structures interaction(FSI)of the streamlined closed-box girder section for VIV responses with different geometric scales were conducted.The results show that the VIV responses of the streamlined closed-box girders have obvious model size effects,where the maximum amplitudes of the main deck model with conventional geometric scale(λ_(L)=1/60)are generally larger than that of the main deck model with large length scale(λ_(L)=1/30).The numerical simulation results of the VIV responses of the streamlined closed-box girder with different geometric scales agree well with the wind tunnel test results,which verify the precision of the numerical method.Furthermore,the numerical results also indicate the ratio of length to width of the bridge girder model and the blocking ratio is not the key influencing factor on the size effects on VIV responses of the bridge girder model with closed-box streamlined section.Moreover,the VIV response of the main deck declines with the increase of the model scale ratio,and there are significant differences in the vortex shedding frequency distribution of the stationary girder model with different scale ratios.

关 键 词：流线型箱梁 涡激共振 模型尺寸效应 风洞试验 计算流体动力学 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]