新建桥梁与邻近既有桥梁主梁涡振气动干扰效应风洞试验研究  

Wind tunnel tests on aerodynamic interference effect of parallel bridges

作　　者：罗士瑾 徐力[2] 华旭刚[3] 陈政清[3] LUO Shijing;XU Li;HUA Xugang;CHEN Zhengqing(Zhoushan Railway Construction Center,Zhoushan 202450,China;China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430212,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]舟山市铁路建设中心,浙江舟山202450 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430212 [3]湖南大学风工程试验研究中心,湖南长沙410082

出　　处：《铁道科学与工程学报》2023年第7期2561-2571,共11页Journal of Railway Science and Engineering

基　　金：国家杰出青年科学基金资助项目(52025082);湖南省研究生科研创新项目(CX20190288);中国工程院咨询项目(2021-XZ-37)。

摘　　要：新建甬州铁路桃夭门大桥为主跨666 m的分离式三箱梁斜拉桥,与既有桃夭门公路大桥并列布置且距离较近,两桥主梁间的气动干扰是大桥抗风设计中必须考虑的关键因素。基于节段模型风洞试验方法,研究新桥单独存在和新桥和既有桥梁同时存在时新桥和既有桥梁的涡振性能,分析分离式三箱梁新桥与单箱梁既有桥梁之间气动干扰效应对主梁涡振性能的影响。在新桥单独存在时,分离式三箱梁新桥产生了大幅涡振,在开槽处设置格栅板能显著降低涡振响应;此外采用CFD仿真结果显示,开槽处设置格栅板后漩涡脱落明显降低而抑制了涡振。气动干扰研究结果表明:在不同风向下,新桥和既有桥梁之间的气动干扰效应对主梁的涡振性能影响不同。新桥位于迎风侧时,新桥的涡振性能与新桥单独存在时基本一致,下游既有桥梁对其涡振性能影响很小;迎风侧新桥的存在减小了低风速下既有桥梁的涡振响应,对既有桥梁的涡振控制有利。既有桥梁在迎风侧时,背风侧新桥会增大迎风侧既有桥梁的涡振振幅,同时,受既有桥梁尾流影响,新桥的涡振性能也更为不利。提高新桥和既有桥梁的阻尼比,可以有效地抑制其涡振响应,以满足规范限值的要求。The newly built Taoyaomen bridge on Yongzhou railway was a cable-stayed bridge with a separated triple-box girder and a main span of 666 m,which was close to the existing Taoyaomen highway bridge with a single box girder.The aerodynamic interference between the main girders for the two bridges was a key factor that must be carefully considered in the wind resistance design.Based on the section-model wind tunnel tests,this paper studied the vortex-induced vibrations(VIV)of the new and existing bridges by considering the new bridge alone or these two bridges simultaneously.The influence of the aerodynamic interference between the new and existing bridges was analyzed.In case of the new bridge alone,large-amplitude VIV occurred for different wind attack angles.It can be mitigated by adding the grid plate at the girder gap.Simulation from CFD shows that the vortex shedding is significantly suppressed after adding the grid plate at the girder gap.In case of presence of two bridge girder,when the new bridge is located on the windward side,the vortex vibration performance of the new bridge is very close to that of the new bridge alone,and the existing bridge downstream has little effect on its vortex vibration performance.The vortex vibration response of the existing bridge under low wind speed is mitigated due to the new bridge on the windward side,which is beneficial to the vortex vibration control of the existing bridge.On the other hand,when the existing bridge is on the windward side,the vortex vibration amplitude of the existing bridge is increased because of the new bridge on the leeward side.Meanwhile,the vortex vibration performance of the new bridge is found to be more unfavorable under the wake of the existing bridge.The damping ratio increase of the new and existing bridges can effectively suppress the vortex vibration responses so that the code’s limit requirement can be met.

关 键 词：桥梁工程 分离式三箱梁 临近桥梁 气动干扰 涡激振动 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]