| 桥梁温度跨度对CRTSⅡ型板式无砟轨道无缝线路的影响 |
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| 引用本文： | 陈小平.桥梁温度跨度对CRTSⅡ型板式无砟轨道无缝线路的影响[J].华东交通大学学报,2012,29(3):26-30. |
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| 作者姓名： | 陈小平 |
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| 作者单位： | 福建工程学院土木工程系,福建福州350108;西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 |
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| 基金项目： | 福建省自然科学基金项目，铁道部科技研究开发计划项目，西南交通大学高速铁路线路工程教育部重点实验室开发基金项目 |
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| 摘 要： | 为探索桥上CRTSⅡ型板式无砟轨道的桥梁温度跨度的合理限值,运用线板桥墩一体化模型计算了不同温度跨度下钢轨制动力和伸缩力,基于弹性点支承梁理论分析了桥梁温度跨度对钢轨强度的影响,运用屈曲有限元分析了桥梁温度跨度对无缝线路稳定性的影响,根据钢轨与轨道板的相对位移分析了桥梁温度跨度对扣件耐久性的影响。结果表明,为保证无缝线路强度、稳定性及扣件耐久性,桥梁温度跨度的合理限值为482 m。
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| 关 键 词： | 温度跨度 无缝线路 桥梁 CRTSⅡ型板式无砟轨道 |
Effects of Bridge Expansion Length on Continuous Welded Rail of CRTS Ⅱ Slab Ballstless Track |
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| Chen Xiaoping.Effects of Bridge Expansion Length on Continuous Welded Rail of CRTS Ⅱ Slab Ballstless Track[J].Journal of East China Jiaotong University,2012,29(3):26-30. |
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| Authors: | Chen Xiaoping |
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| Institution: | Chen Xiaoping 1,2(1.Department of Civil Engineering,Fujian University of Technology,Fuzhou 350108,China;2.MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | To investigate the reasonable limit value of bridge expansion length about CRTSⅡ slab ballastless track,longitudinal forces of rail caused by train braking or bridge expansion are calculated by using rail-slab-beam-pier integrated model.Based on the theory of continuous beam on discrete elastic supports,effect of bridge expansion length on stress of rail is analyzed.Rail stability is analyzed by finite element buckling method.Effect of bridge expansion length on clip durability is also analyzed according to relative displacement between rail and substructure.The results show that the reasonable limit value of bridge expansion length is 482 m for the sake of rail strength,stability and clip durability. |
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| Keywords: | expansion length continuous welded rail bridge CRTSⅡslab ballastless track |
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