典型流线型箱梁扭转涡激气动力的简化涡模式与气动措施抑振机理  

Simplified vortex modes of torsional vortex‑excitation forces in a typical streamlined box girder and its suppression mechanism with aerodynamic countermeasures

作　　者：胡传新 官绪龙 赵林[3] 葛耀君[3] HU Chuanxin;GUAN Xulong;ZHAO Lin;GE Yaojun(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan University of Science and Technology,Wuhan 430065,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]武汉科技大学城市更新湖北省工程研究中心,湖北武汉430065 [3]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《振动工程学报》2025年第2期302-309,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52108471);国家重点研发计划项目(2022YFC3005301,2022YFC3004105);湖北省高等学校优秀中青年科技创新团队计划项目(T2022002)。

摘　　要：以典型流线型闭口箱梁为研究对象,利用节段模型风洞试验,获取原始断面与优化断面(栏杆扶手抑流板断面和检修轨道导流板断面)涡振响应,并分析其典型风速下断面周围分布气动力矩贡献,结合简化涡和数值模拟方法,推演断面周围流场演变特征,揭示了流线型箱梁扭转涡振及气动措施抑振机理,为主梁扭转涡振及抑振机理分析提供了一种思路。研究表明:原始断面存在明显扭转涡振现象,其振幅达0.112°,增设检修轨道导流板后振幅降低35.7%,增设抑流板后涡振现象消失。原始断面和导流板断面涡振时,上表面分布气动力矩对涡激力矩贡献值远大于下表面,二者均由上表面大尺度前缘分离涡主导,分离涡漂移时长约为2.5个断面振动周期,对应2阶扭转简化涡模态。增设导流板后,断面上表面分布气动力矩对涡激力矩的贡献显著减小,旋涡漂移模式与断面振动之间的相位关系发生改变,断面周围旋涡作用强度减小,故涡振振幅降低。增设栏杆扶手抑流板后,上表面分布气动力矩对涡激力矩贡献值显著减小且其波浪式分布消失,上表面前缘大尺度分离涡的形成得到抑制,故断面涡振现象消失。A typical streamlined closed-box girder is taken as the research object in this paper.Utilizing the wind tunnel tests with a section model,vortex-induced vibration(VIV)responses of the grinder section were obtained,and the contribution values of the distributed aerodynamic torques were analyzed for both the original and improved girder designs(the improved girder with spoilers and the improved girder with guide vanes for maintenance rails)under typical wind conditions.By combining the simplified vortex method(SVM)with numerical simulation,the torsional VIV of the bridge girder and its suppression mechanism with additional aerodynamic countermeasures were further revealed.This paper provides a new methodology for analyzing the VIV mechanism of bridge girders and the VIV suppression mechanism of aerodynamic countermeasures.The results reveal that an obvious torsional VIV phenomenon was observed on the original girder,with a maximum amplitude of 0.112°.After adding guide vanes for the main-tenance rail,the torsional VIV amplitude of the section was reduced by 35.7%,and the torsional VIV phenomenon disappears af-ter the addition of the spoilers on the sidewalks’handrails.For both the original and guide vane girders,the contribution values of the distributed aerodynamic torques on the upper surface to the global vortex excited force(VEF)were much greater than those on the lower surface.The VIVs of the original and guide vane girders were dominated by the periodic drift of the large-scale vortices generated from the leading edge to the trailing edge on the upper surface.The drift time of the vortices was approximately 2.5 vibra-tion cycles,which corresponds to the second-order torsional simplified vortex mode.After the installation of guide vanes for the maintenance rails,the contribution values of the distributed aerodynamic forces to the global VEF were significantly reduced,and the scale and intensity of vortices around the girder were reduced,so the VIV amplitude decreased.After adding spoilers,the con-tribution

关 键 词：桥梁工程 扭转涡振 简化涡方法 流线型闭口箱梁 抑流板 检修轨道导流板 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]