桥梁箱型吊杆涡振与驰振耦合振动的数值模拟  

Numerical Simulation on Coupled Vibration of Vortex-induced Vibration and Galloping Vibration for Box Hangers of Bridges

作　　者：周帅[1] 曾永平[1] 杨国静[1] 王典斌[1] 

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《建筑科学与工程学报》2015年第2期84-90,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金高铁联合基金项目(U13342002);中国铁路总公司重大项目(2014G004-A);中国中铁二院工程集团有限责任公司科研项目(14126199)

摘　　要：为研究桥梁箱型吊杆涡振与驰振耦合状态下的风致振动机理,基于某大跨度钢桁架拱桥大长细比箱型吊杆的节段模型风洞试验参数与试验结果,采用计算流体动力学(CFD)软件FLUENT对模型的耦合振动进行了数值模拟,通过FLUENT的后处理功能进一步研究分析了不同振动状态下的气动力和尾流旋涡特征信息。研究结果表明:数值计算得到的风振曲线与试验的实测结果吻合良好,在涡振与驰振的耦合振动过程中,随着振动幅值的不断增大,尾流旋涡脱落由小振幅阶段规则的卡门旋涡形态转化为大振幅阶段的复合模态特征,气动升力也由小振幅阶段的单频特征逐步转化为大振幅阶段的多频特征。In order to investigate the coupling oscillation mechanism of vortex-induced vibration and galloping for box hangers of bridge,the numerical simulations were performed with computational fluid dynamics（CFD）software FLUENT based on section model wind tunnel test parameters and test results of box hangers with large slenderness ratio of a large span arch bridge.The details on aerodynamic forces and vortices of this kind of coupling vibration were further disclosed by FLUENT.The study results show that calculation results agree well with experimental results.With the continuous increase of the vibration amplitude,the wake vortices shedding turns from the Karmen mode at tiny oscillation amplitude stage to the multiple composite mode at large amplitude stage,and the frequency spectrum of aerodynamic lift transforms from single frequency to multiple frequency during coupled vibration process of vortex-induced vibration and galloping vibration.

关 键 词：桥梁工程 箱型吊杆 涡振 驰振 耦合振动 尾流旋涡 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]