中央扣对三塔悬索桥动力特性的影响
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摘要
基于ANSYS软件建立了泰州长江公路大桥的三维有限元计算模型,并采用子空间迭代法对其进行了自振特性分析,研究了在主跨跨中主缆和主梁之间设置中央扣对大跨度三塔悬索桥动力特性的影响。结果表明:中央扣的设置对第1阶竖弯振型有较大影响,对某些竖弯振型有非常大的影响,而且较明显地推迟了1阶反对称扭转振型的出现,增大了侧弯振动频率;对单跨内反对称侧弯振型的影响大于单跨内正对称侧弯振型,使得以缆索振动为主的振型推迟出现;所得结论为该桥的抗风、抗震研究提供了必要的信息和研究基础。
A 3-D finite element calculation model was established for Taizhou Yangtze River Bridge based on ANSYS software,and the subspace iteration method was adopted to analyze the natural vibration characteristics of the bridge,meanwhile,the influences of settings of central buckles at the mid-span of the main spans between the main cables and the main girder on the dynamic behaviors of a long-span triple-tower suspension bridge were studied.The results show that settings of central buckles have great influence on the first vertical bending vibration mode and have tremendous influence on some other vertical bending modes.Furthermore,central buckles postpone the appearance of the first torsion vibration mode as well as modes mainly consist of main cable vibration.Setting of central buckles increases frequencies of lateral bending vibration modes,and it has greater influence on those vibration modes with an antisymmetric shape in each single span than those with a symmetric shape in each single span.The research results provide a necessary information and research foundation for wind-resistant and anti-seismic research of the bridge.
A 3-D finite element calculation model was established for Taizhou Yangtze River Bridge based on ANSYS software,and the subspace iteration method was adopted to analyze the natural vibration characteristics of the bridge,meanwhile,the influences of settings of central buckles at the mid-span of the main spans between the main cables and the main girder on the dynamic behaviors of a long-span triple-tower suspension bridge were studied.The results show that settings of central buckles have great influence on the first vertical bending vibration mode and have tremendous influence on some other vertical bending modes.Furthermore,central buckles postpone the appearance of the first torsion vibration mode as well as modes mainly consist of main cable vibration.Setting of central buckles increases frequencies of lateral bending vibration modes,and it has greater influence on those vibration modes with an antisymmetric shape in each single span than those with a symmetric shape in each single span.The research results provide a necessary information and research foundation for wind-resistant and anti-seismic research of the bridge.
引文
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[14]HUA X G,CHEN Z Q.Full-order and MultimodeFlutter Analysis Using ANSYS[J].Finite Elementsin Analysis and Design,2008,44(9/10):537-551.
[2]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,2003.LI Guo-hao.Stability and Vibration of Bridge Struc-ture[M].Beijing:China Railway Publishing House,2003.
[3]胡建华.大跨度自锚式悬索桥结构体系及静动力性能研究[D].长沙:湖南大学,2006.HU Jian-hua.Study on Structural System and Staticand Dynamic Performance of Long-span Self-anchoredSuspension Bridge[D].Changsha:Hunan University,2006.
[4]KAROUMI R.Some Modeling Aspects in the Non-linear Finite Element Analysis of Cable SupportedBridges[J].Computers and Structures,1999,71(4):397-412.
[5]邓育林,彭天波,李建中,等.大跨度三塔悬索桥动力特性及抗震性能研究[J].振动与冲击,2008,27(9):105-110.DENG Yu-lin,PENG Tian-bo,LI Jian-zhong,et al.Study on Dynamic Characteristic and Aseismic Per-formance of a Long-span Triple-tower SuspensionBridge[J].Journal of Vibration and Shock,2008,27(9):105-110.
[6]杨孟刚,陈政清.基于UL列式的两节点悬链线索元非线性有限元分析[J].土木工程学报,2003,36(8):63-68.YANG Meng-gang,CHEN Zheng-qing.The Non-lin-ear Finite Element Analysis for Two-node CatenaryElement of Cable Structure Based on UL Formulation[J].China Civil Engineering Journal,2003,36(8):63-68.
[7]宗周红,赖苍林,林友勤,等.大跨度预应力混凝土连续刚构桥的动力特性分析[J].地震工程与工程振动,2004,24(3):98-104.ZONG Zhou-hong,LAI Cang-lin,LIN You-qin,et al.Analysis of Dynamic Characteristics of a Large-spanPrestressed Concrete Continuous Rigid Frame Bridge[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(3):98-104.
[8]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Li-chu.Seismic Design for Bridges[M].Shang-hai:Tongji University Press,1997.
[9]XU Y L,KO J M.Vibration Studies of Tsing Ma Sus-pension Bridge[J].Journal of Bridge Engineering,1997,11:149-156.
[10]王浩,李爱群,杨玉冬,等.中央扣对大跨悬索桥动力特性的影响[J].中国公路学报,2006,19(6):49-53.WANG Hao,LI Ai-qun,YANG Yu-dong,et al.Influ-ence of Central Buckle on Dynamic Behavior of Long-span Suspension Bridge[J].China Journal of Highwayand Transport,2006,19(6):49-53.
[11]ABDEL-GHAFFAR A M.Vibration Studies and Testsof a Suspension Bridge[J].Earthquake Engineeringand Structural Dynamics,1978,6(5):473-496.
[12]CHENG J,JIANG J J,XIAO R C,et al.SeriesMethod for Analyzing 3D Nonlinear Torsional Diver-gence of Suspension Bridges[J].Computers andStructures,2003,81(5):299-308.
[13]尼尔斯J G.缆索支承桥梁———概念与设计[M].金增洪,译.北京:人民交通出版社,2002.NIELS J G.Cable Supported Bridge-Concept andDesign[M].Translated by JIN Zeng-hong.Beijing:China Communications Press,2002.
[14]HUA X G,CHEN Z Q.Full-order and MultimodeFlutter Analysis Using ANSYS[J].Finite Elementsin Analysis and Design,2008,44(9/10):537-551.
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