首页|公铁两用大跨度斜拉桥-无砟轨道体系变形适应性研究

公铁两用大跨度斜拉桥-无砟轨道体系变形适应性研究

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高速铁路大跨度斜拉桥结构变形受其复杂服役环境影响显著,而无砟轨道对工后变形的调整能力有限,因此大跨度斜拉桥的复杂变形条件将直接影响其上无砟轨道结构的适应性.以沪渝蓉高铁长江北支公铁两用大跨度斜拉桥应用无砟轨道为工程背景,建立无砟轨道-大跨度斜拉桥一体化精细空间有限元模型,分析铁路、公路以及温度等多种荷载联合作用下大跨度斜拉桥-无砟轨道体系平顺性、无缝线路稳定性和无砟轨道层间变形协调性,从而对大跨度公铁两用钢桁梁斜拉桥-无砟轨道体系变形适应性开展深入研究.结果表明:在运营荷载及温度荷载最不利组合作用下,大跨度斜拉桥主梁线形平顺,变形平缓,桥梁整体刚度较好,桥上无砟轨道几何形位可以满足静态验收标准;大跨度斜拉桥上无缝线路的强度和稳定性满足要求,扣件工作性能良好,钢轨伸缩调节器的设置可有效释放梁端钢轨的纵向应力;无砟轨道层间设置橡胶隔离层且不跨主梁桁架节间的布置方式可提高大跨度斜拉桥上无砟轨道的变形协调性能,使得桥上无砟轨道层间始终处于受压状态,达到"隔而不离"的桥上轨道层间理想服役状态;大跨度公铁两用钢桁梁斜拉桥-无砟轨道体系变形适应性良好.本文研究成果可为公铁两用大跨度钢桁梁斜拉桥上无砟轨道的应用提供技术参考.
Deformation adaptability of ballastless track on highway and railway long-span cable-stayed bridge
The deformation of long-span cable-stayed bridges in high-speed railway systems is significantly influenced by their complex operating environment.However,the ability of ballastless tracks to adjust to post-construction deformations is still limited.Therefore,the complex deformation conditions of long-span cable-stayed bridges will directly affect the adaptability of the ballastless track structure on top of them.Based on the application of ballastless track in the Yangtze River North Branch Highway and Railway Cable-stayed Bridge as the engineering background,a refined spatial finite element model for the integrated system of the ballastless track and the long-span cable-stayed bridge was established.The smoothness of long-span cable-stayed bridge ballastless track system,the stability of continuous welded rail and the coordination of deformations between the layers of the ballastless track under the combined action of various loads,including railway,highway,and temperature effects were analyzed.According to the research,a comprehensive investigation is conducted on the deformation adaptability of the long-span highway and railway dual-purpose steel truss cable-stayed bridge with ballastless track system.The results are drawn as follows.Under the combined action of operating loads and temperature loads in the most unfavorable combination,the main beam of the long-span cable-stayed bridge maintains smooth alignment and exhibits gradual deformation.The overall stiffness of the bridge is good,and the geometric position of the ballastless track on the bridge satisfies the static acceptance criteria.The strength and stability of the continuous welded rail on the cable-stayed bridge meet the requirements which means the fasteners work well and the rail expansion joints can effectively release the longitudinal stress of the rail.The rubber isolation layer can improve the deformation coordination performance of the ballastless track on the bridge.The ballastless track is in a state of compression between layers,achieving the ideal service condition of"isolation without separation".The long-span highway and railway dual-purpose steel truss cable-stayed bridge with ballastless track system exhibits good deformation adaptability.The research findings presented in this work can serve as a technical reference for the application of ballastless tracks on long-span dual-purpose steel truss cable-stayed bridges.

highway and railway long span cable-stayed bridgeballastless trackcontinuous welded raildeformation adaptabilitystabilitysmoothnesscoordination

盛兴旺、郭舜哲、郑纬奇、朱志辉、胡辉跃

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中南大学 土木工程学院,湖南 长沙 410075

湖南铁院土木工程检测有限公司,湖南 长沙 410075

中国中铁大桥勘测设计院集团有限公司,湖北 武汉 430058

公铁两用大跨度斜拉桥 无砟轨道 无缝线路 变形适应性 稳定性 平顺性 协调性

国家自然科学基金湖南省自然科学基金湖南省教育厅科研项目湖南铁院土木工程检测有限公司开放基金国家铁路集团有限公司科技研发计划

520784882022JJ4062821A0010HNTY2022K08L2021G007

2024

10.19713/j.cnki.43-1423/u.T20230646

铁道科学与工程学报
中南大学 中国铁道学会

铁道科学与工程学报

CSTPCD北大核心EI
影响因子：0.837
ISSN：1672-7029
年,卷(期)：2024.21(3)
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