摘要
为减缓轨道和桥梁纵向作用,提升大跨度悬索桥上无缝线路强度与稳定性,以一座主跨1090 m的悬索桥为工程背景,运用有限单元法,建立大跨度悬索桥上无缝线路纵向力计算耦合模型,分析伸缩调节器布置、扣件阻力对钢轨伸缩力、挠曲力和制动力的影响规律,以优化伸缩调节器和扣件阻力布置.实验结果表明,钢轨伸缩力、挠曲力和制动力均随着伸缩调节器离梁端的距离减小而非线性降低,工程中伸缩调节器合理布置范围在距梁端10~30 m范围,其中以距梁端20 m为首选.小阻力扣件铺设长度小于20 m时,钢轨伸缩力随小阻力扣件铺设长度增加大幅减小;小阻力扣件铺设长度超过20 m后,钢轨伸缩力随铺设长度增加仅小幅减小.钢轨伸缩力、挠曲力和制动力均随着小阻力扣件阻力值增大而增大,其中伸缩力增幅最大.综合来看,大跨度悬索桥上钢轨扣件优选布置方案为在伸缩调节器基本轨侧20 m范围内布设6~8 kN/m小阻力扣件,其余区段布设常阻力扣件.
To mitigate the longitudinal forces of tracks and bridges and improve the strength and stability of continuous welded rails on long-span suspension bridges,a suspension bridge with a main span of 1090 m is used as the engineering background.The finite element method is used to establish a coupled model for calculating the longitudinal forces of continuous welded rails on a large-span suspension bridge.The influence of the layout of expansion rail joints and fastener resistance on rail expansion force,bending force and braking force are analyzed to optimize the arrangement of expansion rail joints and fastener resistance.The results show that rail expansion force,bending force and braking force all decrease non-linearly with the decrease of the distance between the expansion rail joint and the end of the beam.The reasonable arrangement range of expansion rail joints in the project is 10 m to 30 m from the end of the beam,with 20 m from the end of the beam being the first choice.When the length of low-resistance fasteners from the end of the beam is less than 20 m,the rail expansion force significantly decreases with the increase in the length of low-resistance fasteners;when the length of low-resistance fasteners exceed 20 m,the rail expansion force only decreases slightly with the increase in the length.Rail expansion force,bending force and braking force all increase with the increase of the resistance value of the low-resistance fastener,among which the expansion force increases the most.Overall,the optimal layout scheme for rail fasteners on long-span suspension bridges is to lay out low-resistance fasteners with a resistance value of 6~8 kN/m within 20 m on the stock rail with expansion rail joints,while the remaining sections are equipped with conventional resistance fasteners.
作者
令行
陈雨
王海林
范宇翔
LING Xing;CHEN Yu;WANG Hailin;FAN Yuxiang(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Key Laboratory for Track System of High-Speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)
出处
《成都大学学报(自然科学版)》
2025年第4期430-436,共7页
Journal of Chengdu University(Natural Science Edition)
基金
高速铁路轨道系统全国重点实验室开放基金项目(2022YJ121)。
关键词
大跨度悬索桥
无缝线路
纵向作用
参数优化
long-span suspension bridge
continuous welded rails
longitudinal forces
parameters optimization
