拱桥拱肋段缆索吊装状态时的风致响应研究  

Wind-induced response of the arch rib section of an arch bridge in cable hoisting process

作　　者：高子龙 彭志辉 杨博开 唐浩俊[1] 张耀 李永乐[1] GAO Zilong;PENG Zhihui;YANG Bokai;TANG Haojun;ZHANG Yao;LI Yongle(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100120,China)

机构地区：[1]西南交通大学桥梁工程系,成都610031 [2]中交第二航务工程局有限公司,武汉430040 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100120

出　　处：《振动与冲击》2024年第18期239-247,共9页Journal of Vibration and Shock

基　　金：四川省自然科学基金(2022NSFSC0431,2022NSFSC0004)。

摘　　要：山区地形地貌复杂,受施工场地的限制,大跨桥梁施工多采取跨越能力强的缆索吊装法,但缆索系统轻柔的力学特性使其抗风问题突出。为掌握拱肋段缆索吊装过程中的风致响应特性,该文以某山区钢管混凝土拱桥为对象,首先通过有限元分析研究了缆索吊装体系在空载和吊重状态下的模态特性,讨论了拱肋段的动力学行为及影响因素;然后通过计算流体力学仿真模拟识别了不同拱肋段的气动力系数;最后通过瞬态分析计算了拱肋段缆索吊装状态时的风致响应。研究结果表明:当缆索吊装系统为吊重状态时,起吊索和吊重物在横桥向和绕竖轴扭转的风致振动现象明显;当吊装段由边跨向跨中行进时,其振动大小呈先增大后减小趋势;当吊装段下降时,除横桥向振动增大外,其余方向的振动均有所减小。The mountainous terrain is complex.Due to the limitation of the construction site,in the long-span bridge construction,the cable hoisting method with strong spanning ability is mostly adopted.But the gentle mechanical properties of the cable system make its wind resistance problem more prominent.In order to grasp the wind-induced response characteristics of the arch rib section during cable hoisting process,a concrete-filled steel tube arch bridge in a mountainous area was taken as the study object.Firstly,the modal characteristics of the cable hoisting system under no-load and load conditions were studied by finite element analysis,and the dynamic behavior and influencing factors of the arch rib section were discussed.Then the aerodynamic coefficients of different arch rib sections were identified by computational fluid dynamics simulation.Finally,the wind-induced response of the arch rib section during cable hoisting process was calculated by transient analysis.The research results show that when the cable hoisting system is in the lifting state,the wind-induced vibrations of the lifting rope and the lifting object in the transverse bridge direction and around the vertical axis are obvious.When the hoisted section is moving from the side span to the middle span,the vibration magnitude increases first and then decreases.When the hoisting section is in the dropping state,the vibrations in other direction decreases except that the vibration in the transverse bridge direction increases.

关 键 词：拱桥 吊装系统 风致响应 有限元分析 气动力 

分 类 号：O355[理学—流体力学]