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。
To investigate the reasonable limit value of bridge expansion length about CRTS Ⅱ 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.
出处
《华东交通大学学报》
2012年第3期26-30,共5页
Journal of East China Jiaotong University
基金
福建省自然科学基金项目(2011J05120)
铁道部科技研究开发计划项目(2010G006-B)
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(2011-HRE-04)
