大风地区铁路接触网结构的非线性屈曲分析
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摘要
以新疆铁路某大风地区接触网为研究对象,考虑接触网结构材料非线性和几何非线性效应,探讨了接触网有限元建模问题。利用有限元分析软件ANSYS的非线性分析功能,以Budiansky-Roth准则为屈曲失稳判据,对接触网结构进行非线性屈曲分析。对接触网施加横向风载荷后,计算并提取在结构高度、跨距、吊弦数3个结构参数不同情况下的屈曲风速值,根据数据结果分析3种结构参数对结构静态稳定性的影响,并确定了较为合适的结构参数。计算结果表明:提高接触网支撑结构的刚度可以获得较好的稳定性;结构高度和跨距对接触网承载能力影响较大,高度和跨距越小,静态稳定性越好;考虑结构刚度和受压变形,吊弦数取8个最为适宜。
Based on catenary systems of Xinjiang railway in strong wind area,the effect of kinematic nonlinearity and material nonlinearity of catenary systems was considered,and the finite model of catenary systems was discussed.It analyzed the catenary systems in nonlinear buckling instability by using the nonlinear analysis module of the software package ANSYS and Budiansky-Roth criterion.The buckling wind velocity in different situations of structure height,span,and the number of hanger was calculated and extracted after loading horizontal wind on catenary systems.Then it analyzed the influence of three parameters on static stability of the structure and confirmed the appropriate structural parameters according to the data results.The calculation result showed that it could obtain preferable stability by increasing the stiffness of the catenary support structure.The structure height and span had a great influence on load bearing properties of catenary systems: the smaller height and span were,the better static stability was;and the most appropriate hanger number was 8 considering structural stiffness and compressive deformation.
Based on catenary systems of Xinjiang railway in strong wind area,the effect of kinematic nonlinearity and material nonlinearity of catenary systems was considered,and the finite model of catenary systems was discussed.It analyzed the catenary systems in nonlinear buckling instability by using the nonlinear analysis module of the software package ANSYS and Budiansky-Roth criterion.The buckling wind velocity in different situations of structure height,span,and the number of hanger was calculated and extracted after loading horizontal wind on catenary systems.Then it analyzed the influence of three parameters on static stability of the structure and confirmed the appropriate structural parameters according to the data results.The calculation result showed that it could obtain preferable stability by increasing the stiffness of the catenary support structure.The structure height and span had a great influence on load bearing properties of catenary systems: the smaller height and span were,the better static stability was;and the most appropriate hanger number was 8 considering structural stiffness and compressive deformation.
引文
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[2]于万聚.高速电气化铁路接触网[M].成都:西南交通大学出版社,2002.
[3]今井俊昭.急激な風速増加が生じる確率をどの用にして知るか[J].時代をリードする鉄道技術の情報誌,20 03(8):10-13.
[4]田志军.电气化铁路接触网防风技术研究[J].建设机械技术与管理,2007(7):100-103.
[5]郭金平,姜汉登,杨学军,等.电气化铁路接触网的防风改造[J].中国铁路,2001(9):38-39.
[6]刘怡,张卫华,黄标.高速铁路接触网动力学响应实验及仿真[J].中国铁道科学,2005(3):106-109.
[7]冷纪桐,陈罕.几何非线性和材料非线性[J].北京化工学院学报,1989,16(3):50-58.
[8]王开强,李国强,杨涛春.考虑悬链线效应的约束钢梁在分布荷载作用下的性能(Ⅰ)——理论模型[J].土木工程学报,2010,43(1):1-7.
[9]完海鹰,黄炳生.大跨空间结构[M].北京:中国建筑工业出版社,2000.
[10]Salvatori L,Borri C.Frequency-and Time-Domain Methodsfor the Numerical Modeling of Full-Bridge Aero Elasticity[J].Computers and Structures,2007,85:675-687.
[11]李支军,李爱群,韩晓林.润扬大桥悬索桥动力特性分析与实测变异性研究[J].土木工程学报,2010,43(4):92-98.
[12]王述超,张行,叶志雄,等.超限高层建筑地震作用下的动力稳定性分析[J].振动与冲击,2009,28(4):149-172.
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