国外某既有铁路钢梁受力及变形分析
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摘要
国外某既有客货共线单线铁路的钢梁结构类型主要有上承式钢板梁、上承式钢混结合梁和下承式钢桁梁。为研究钢梁梁体结构在不同列车活载作用下的受力及变形情况,本文采用有限元分析方法对其建模进行分析研究。结果表明:(1)采用"中-18"标准活载时,24 m上承式钢板梁、上承式钢-混结合梁和48 m下承式钢桁梁均能满足结构受力和变形要求;(2)采用"中-20"标准活载时,24 m上承式钢板梁和上承式钢混结合梁不能满足结构受力和变形要求,48 m下承式钢桁梁在对端横梁进行局部加固后可满足受力和变形要求。文章同时还分析了不同曲线半径上的列车最高行车速度,结合本线年久失修的现状,对既有铁路钢梁桥提出不宜提高列车轴重和行车速度的建议,为该铁路继续安全运营提供了依据。
The main girder structure types of an existing foreign cargo and passenger single-track railway line include the deck steel plate girder,deck steel-concrete composite girder and the through steel truss girder. Finite element analysis is used to study and analyze Ithe stress and deformation of the steel girder structure under different train live loads. The conclusion shows that when using the standard live load of Chinese Standard- 18,24 m deck steel plate girder,deck steel-concrete composite girder and 48 m through steel truss girder are able to meet the requirements of the force and deformation,when using the standard live load of Chinese Standard-20,24 m deck steel plate girder and deck steelconcrete composite girder are able to meet the requirements of the force and deformation if the end transverse beams are strengthened. Meanwhile the maximum train driving speed on different curve radius is also analyzed. Combined with the status of disrepair of the line,it is suggested that it is unsuitable to increase the train axle load or the train speed for the existing steel girder bridge,which provides a basis for the safe operation of this line.
The main girder structure types of an existing foreign cargo and passenger single-track railway line include the deck steel plate girder,deck steel-concrete composite girder and the through steel truss girder. Finite element analysis is used to study and analyze Ithe stress and deformation of the steel girder structure under different train live loads. The conclusion shows that when using the standard live load of Chinese Standard- 18,24 m deck steel plate girder,deck steel-concrete composite girder and 48 m through steel truss girder are able to meet the requirements of the force and deformation,when using the standard live load of Chinese Standard-20,24 m deck steel plate girder and deck steelconcrete composite girder are able to meet the requirements of the force and deformation if the end transverse beams are strengthened. Meanwhile the maximum train driving speed on different curve radius is also analyzed. Combined with the status of disrepair of the line,it is suggested that it is unsuitable to increase the train axle load or the train speed for the existing steel girder bridge,which provides a basis for the safe operation of this line.
引文
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[3]陈玉骥,叶梅新.简支下承式桁梁结合梁的模型试验[J].中国铁道科学,2004,25(6):82-87.CHEN Yuji,YE Meixin.Model Test for Through Truss Composite Beam with Simple Support[J].China Railway Science,2004,25(6):82-87.
[4]李建中,范立础.提速货车作用下铁路钢板梁横向振动机理[J].同济大学学报,2001,29(1):104-108.LI Jianzhong,FAN Lichu.Lateral Vibration Research of the Deck Steel Plate Bridges under Raised Speed Freight Train[J].Journal of Tongji University,2001,29(1):104-108.
[5]刘伯权,黄华,刘鸣.简支梁桥在车辆荷载谱作用下的动力分析[J].土木工程学报,2006,39(3):76-80.LIU Boquan,HUANG Hua,LIU Ming.Dynamic Analysis of Simply Supported Beam Bridges under Vehicle Load Spectrum[J].China Civil Engineering Journal,2006,39(3):76-80.
[6]刘鹏辉,姚京川,董振升.提速条件下32m下承钢板梁综合动力性能的安全性评估[J].铁道建筑,2008,48(1):28-30.LIU Penghui,YAO Jingchuan,DONG Zhensheng.Safety Evaluation of Comprehensive Dynamic Performance of 32m Span Steel Plate Girder under Inceasing Speed[J].Railway Engineering,2008,48(1):28-30.
[7]郭文华,曾庆元.上承式钢板梁空间振动计算与加固技术研究[J].中国铁道科学,2002,23(5):82-88.GUO Wenhua,ZENG Qingyuan.The Research on Calculation of Spatial Vibration and Reinforcing Technology for Deck Steel Plate Girder Bridges[J].China Railway Science,2002,23(5):82-88.
[8]文超,戴公连.加固后并行钢板梁桥的疲劳寿命分析[J].铁道学报,2002,24(3):71-73.WEN Cao,DAI Gonglian.Fatigue Life Analysis to Reinforced Parallel Armor Plating Girder Bridge[J].Journal of China Railway Society,2002,24(3):71-73.