强风地区接触网动力稳定性分析
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摘要
以兰新线强风地区某段接触网为研究对象,根据接触网的结构特点,利用通用有限元分析软件ANSYS建立单个锚段的支持结构与线耦合的有限元模型。采用Davenport功率谱模拟了适用于接触网结构特点的风速时程,应用非线性有限元法获得接触网在不同平均风速下脉动风荷载作用的风振响应时程;根据特征响应点的风振响应时程,运用Budiansky-Roth准则和动态增量法分析比较接触网结构特性对接触网动力稳定性的影响。分析结果表明:由于兰新线百里风区的最大风速达到了74m.s-1,因此选用跨距小于50m、承力索张力大于15kN的接触网结构较为适宜;通过适当增加承力索张力、减小接触网跨距和降低接触导线高度等措施可有效改善接触网结构的抗风稳定性,而增加吊线数对提高接触网动力稳定性的效果较小。
A certain segment of the catenary of Lanzhou-Xinjiang Railway in strong wind area was taken as the research object. According to the structural characteristics of the catenary systems,a finite element model of the single segment catenary was built up by the finite element program ANSYS,which consisted of the hanging structure and the support structure. A multivariable simulation model of stochastic wind field based on the spectral representation method was proposed,which adopted the DAVENPORT power spectral density unchanging along the height. The response of catenary to vibration caused by varying intensity wind was attained by non-linear finite element method. The dynamic stability and the effect of the structure characteristics on the dynamic stability were researched by combining two kinds of methods:Budiansky-Roth criteria and incremental dynamic analysis. The results show that it is more appropriate to adopt the catenary whose span is less than 50 m,and whose messenger wire tension is greater than 15 kN,because the maximum wind speed of Hundred-Mile Wind Area reaches 74 m·s-1 in Lanzhou-Xinjiang Railway. The dynamic stability of the catenary systems subjected to the dynamic wind load can be improved in evidence by increasing the tension of the messenger wire,decreasing the span of the catenary and reducing the height of the contact wire,while increasing the number of the suspension wire improves less the dynamic stability of the catenary systems.
A certain segment of the catenary of Lanzhou-Xinjiang Railway in strong wind area was taken as the research object. According to the structural characteristics of the catenary systems,a finite element model of the single segment catenary was built up by the finite element program ANSYS,which consisted of the hanging structure and the support structure. A multivariable simulation model of stochastic wind field based on the spectral representation method was proposed,which adopted the DAVENPORT power spectral density unchanging along the height. The response of catenary to vibration caused by varying intensity wind was attained by non-linear finite element method. The dynamic stability and the effect of the structure characteristics on the dynamic stability were researched by combining two kinds of methods:Budiansky-Roth criteria and incremental dynamic analysis. The results show that it is more appropriate to adopt the catenary whose span is less than 50 m,and whose messenger wire tension is greater than 15 kN,because the maximum wind speed of Hundred-Mile Wind Area reaches 74 m·s-1 in Lanzhou-Xinjiang Railway. The dynamic stability of the catenary systems subjected to the dynamic wind load can be improved in evidence by increasing the tension of the messenger wire,decreasing the span of the catenary and reducing the height of the contact wire,while increasing the number of the suspension wire improves less the dynamic stability of the catenary systems.
引文
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[9]李宏男,白海峰.高压输电塔—线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007,40(2):39-46.(LI Hongnan,BAI Haifeng.State-of-the-Art Review on Studies of Disaster Resistance of High-Voltage Transmis-sion Tower-Line Systems[J].China Civil Engineering Journal,2007,40(2):39-46.in Chinese)
[10]刘怡.接触网动应力研究[D].成都:西南交通大学,2007.(LI U Yi.A Study on Dynamics Stress of Catenary[D].Chengdu:Southwest Jiaotong University,2007.in Chi-nese)
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[13]迪尔比耶,汉森.结构风荷载作用[M].北京:中国建筑工业出版社,2006.
[14]李宏男,白海峰.输电塔线体系的风(雨)致振动响应与稳定性研究[J].土木工程学报,2008,41(11):31-38.(LI Hongnan,BAI Haifeng.Dynamic Behavior and Stability of Transmission Tower-Line Systemunder Wind(Rain)Forces[J].China Civil Engineering Journal,2008,41(11):31-38.in Chinese)
[2]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.(GUOJinping,JIANG Handeng,YANG Xuejun,et al.Reformfor Windproof of Contacting Net of Electrification Rail way[J].China Rail ways,2001(9):38-39.in Chinese)
[3]藤井俊茂.自然災害から列車運行の安全を確保する[J].?代をリ?ドする鉄道技術の情報誌,2008(12):2-7.(FUJII Toshishige.Safety Assurance of Train Traffic from Natural Disasters[J].Journal of Rail way Technological Ti mes Herald,2008(12):2-7.in Japanese)
[4]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].?代をリ?ドする鉄道技術の情報誌,2003(8):10-13.(I MAI Toshiaki.Incidence Forecasts of SuddenIncreasein Wind Speed[J].Journal of Rail way Technological Ti mes Herald,2003(8):10-13.in Japanese)
[5]李燕飞.兰新线电气化改造工程大风区段行车安全研究[D].长沙:中南大学,2007.(LI Yanfei.The Train Running Safety Research of Lanchow-Sinkiang Rail way Electrification Transformation Engi-neering at the Strong Wind Zone[D].Changsha:Central South University,2007.in Chinese)
[6]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.(WANG Shuchao,ZHANG Hang,YE Zhixiong,et al.Dynamic Stability Analysis for an Out-of-Codes High Rise Building under Earthquake[J].Journal of Vibration and Shook,2009,28(4):149-172.in Chinese)
[7]李庆伟,李宏男.输电塔结构的动力稳定性研究[J].防灾减灾工程学报,2008,28(2):202-207.(LI Qingwei,LI Hongnan.Study on Dynamic Instability of Transmission Tower[J].Journal of Disaster Prevention and Mitigation Engineering,2008,28(2):202-207.in Chinese)
[8]刘静.特高压输电灯塔线耦联体系风振响应及风洞试验研究[D].重庆:重庆大学,2008.(LI UJing.Research on Responses to Vibration Caused by Blowing and Wind Tunnel Experi ment of Ultra High-Volt-age Electric Transmission Tower and Conductor Coupling System[D].Chongqing:Chongqing University,2007.in Chinese)
[9]李宏男,白海峰.高压输电塔—线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007,40(2):39-46.(LI Hongnan,BAI Haifeng.State-of-the-Art Review on Studies of Disaster Resistance of High-Voltage Transmis-sion Tower-Line Systems[J].China Civil Engineering Journal,2007,40(2):39-46.in Chinese)
[10]刘怡.接触网动应力研究[D].成都:西南交通大学,2007.(LI U Yi.A Study on Dynamics Stress of Catenary[D].Chengdu:Southwest Jiaotong University,2007.in Chi-nese)
[11]SALVATORI L,BORRI C.Frequency and Ti me-Domain Methods for the Numerical Modeling of Full-Bridge Aero Elasticity[J].Computers and Structures,2007,85:675-687.
[12]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,2005,26(2):106-109.(LI U Yi,ZHANG Weihua,HUANG Biao.Experi ment and Si mulation on Dynamic Response of the Catenary inHigh-Speed Rail way[J].China Rail way Science,2005,26(2):106-109.in Chinese)
[13]迪尔比耶,汉森.结构风荷载作用[M].北京:中国建筑工业出版社,2006.
[14]李宏男,白海峰.输电塔线体系的风(雨)致振动响应与稳定性研究[J].土木工程学报,2008,41(11):31-38.(LI Hongnan,BAI Haifeng.Dynamic Behavior and Stability of Transmission Tower-Line Systemunder Wind(Rain)Forces[J].China Civil Engineering Journal,2008,41(11):31-38.in Chinese)
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