Parametric analysis on buffeting performance of a long-span high-speed railway suspension bridge  

大跨高铁悬索桥抖振性能影响参数分析

作　　者：ZHAO Kai-yong WANG Hao TAO Tian-you GAO Hui WU Tong 赵恺雍;王浩;陶天友;郜辉;吴同(Key Laboratory of C&PC Structures of Ministry of Education,Southeast University,Nanjing 211189,China)

机构地区：[1]Key Laboratory of C&PC Structures of Ministry of Education,Southeast University,Nanjing 211189,China

出　　处：《Journal of Central South University》2022年第8期2574-2588,共15页中南大学学报（英文版）

基　　金：Projects(51908125,51978155) supported by the National Natural Science Foundation of China;Project(W03070080)supported by the National Ten Thousand Talent Program for Young Top-notch Talents,China;Project(BK20190359)supported by the Natural Science Foundation of Jiangsu Province,China;Project(BE2018120) supported by the Key Research and Development Plan of Jiangsu Province,China。

摘　　要：The buffeting performance of kilometer-level high-speed railway suspension bridges has a great impact on the smooth operation of high-speed trains.To investigate the buffeting performance of the structure significantly different from traditional suspension bridges,the first long-span high-speed railway suspension bridge,Wufengshan Yangtze River Bridge(WYRB),is taken as a numerical example to demonstrate the effects of structural parameters and wind field parameters on the buffeting responses.Based on the design information,the spatial finite element model(FEM)of WYRB is established before testing its accuracy.The fluctuating wind fields are simulated via both classical and stochastic wave based spectral representation method(SRM).Finite element method is further taken to analyze the parametric sensitivity on wind induced buffeting responses in time domain.The results show that the vertical displacement is more sensitive to the changing dead load than the lateral and torsional ones.The larger stiffness of the main girder and the lower sag-to-span ratio are both helpful to reduce the buffeting responses.Wind spectrum and coherence function are key influencing factors to the responses so setting proper wind field parameters are essential in the wind-resistant design stage.The analytical results can provide references for wind resistance analysis and selection of structural and fluctuating wind field parameters for similar long-span high-speed railway suspension bridges.千米级高铁悬索桥的风致抖振问题严重影响高铁列车的行车安全性与行车舒适度。为深入研究高铁悬索桥的抖振响应,以首座大跨高铁悬索桥——五峰山大桥为例,采用谐波合成法模拟了全桥风场,进而基于有限元方法,分析了结构参数与风环境参数对高铁悬索桥抖振性能的影响。结果表明,在改变主梁质量时,桥梁竖向响应的敏感程度较横向和扭转响应更为敏感;提升主梁的整体刚度、减小主缆的矢跨比都有助于减小悬索桥的抖振响应;横、竖向脉动风谱和风场空间相干函数是影响结构抖振响应的关键因素,因此在抗风设计阶段选取合适的风场参数至关重要。分析结果可为大跨高铁悬索桥的抗风分析及结构、脉动风场参数的选取提供参考。

关 键 词：high-speed railway suspension bridge buffeting performance numerical analysis parametric analysis wind field simulation 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]