闽安特大桥主梁节段模型风洞试验研究  

Wind Tunnel Test on Main Girder Segment Model of Min′an Bridge

作　　者：林锋杰 孙作轩 吴庆雄[3] 庄龙建 林建茂 LIN Fengjie;SUN Zuoxuan;WU Qingxiong;ZHUANG Longjian;LIN Jianmao(Fuzhou Airport Multiple Line Expressway Co.,Ltd.,Fuzhou,Fujian 350019,China;Fujian Provincial Expressway Science and Technology Innovation Research Institute,Fuzhou,Fujian 350003,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州机场复线高速公路有限公司,福建福州350019 [2]福建省高速公路科技创新研究院有限公司,福建福州350003 [3]福州大学土木工程学院,福建福州350108

出　　处：《水利与建筑工程学报》2025年第2期74-81,共8页Journal of Water Resources and Architectural Engineering

基　　金：福建省交通运输科技计划项目(JC202320)。

摘　　要：为了解独柱式双塔混合梁斜拉桥的抗风性能,以福州机场第二高速公路闽安特大桥为研究对象,通过动力特性分析及主梁节段模型风洞试验,研究成桥与施工状态下的颤振、涡激共振(VIV)特性及气动改良措施效果。采用ANSYS有限元模型分析结构动力特性,并基于缩尺模型在均匀流场与5%格栅紊流场中开展刚体节段与气动改良节段的风洞试验。结果表明:成桥与施工状态的一阶竖弯频率分别为0.28 Hz与0.30 Hz,结构柔性显著,需重点关注抗风设计;原始主梁断面在+3°、0°、-3°攻角下均发生超过规范容许值的竖向及扭转涡激共振;通过增设上格栅板、导流板、风障等气动措施组合,涡振振幅降低至规范限值内,且颤振临界风速显著高于检验值;并测得成桥与施工状态主梁断面的三分力系数。气动改良措施可有效抑制分离式双箱梁的涡激共振,同时维持颤振稳定性。To understand the wind resistance performance of single-pillar double-tower hybrid beam oblique-pull bridge,taking the Min′an Bridge on the second Fuzhou airport highway as the research object,this paper conducts dynamic characteristic analysis and wind tunnel tests on section models of the main girder in both the completed bridge and construction states,focusing on aerodynamic instability phenomena such as flutter and vortex-induced vibrations(VIV),and evaluates the effectiveness of proposed aerodynamic mitigation measures.ANSYS finite element models were adopted to analyze structural dynamic characteristics,and performs wind tunnel tests on rigid and aerodynamically modified girder section models in both uniform flow and 5%grid-generated turbulent boundary layer.The results are as follows.The first vertical bending frequencies for the completed bridge and construction states are 0.28 Hz and 0.30 Hz respectively,demonstrating significant structural flexibility and emphasizing the importance of wind resistance design;the original girder cross-section experiences excessive vertical and torsional VIV beyond permissible code limits at attack angles of+3°,0°and-3°.Through a combination of aerodynamic measures including upper grating plates,guide plates,and wind screens,VIV amplitudes are reduced within allowable limits,and flutter critical wind speeds are significantly increased beyond verification values;And the three-point bending coefficient of the main girder section of the bridge and the construction state was measured.Aerodynamic modification measures can effectively suppress the-induced resonance of the separated double-box girder,while maintaining flutter stability.

关 键 词：混合梁斜拉桥 动力特性 风洞试验 颤振 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]