摘要
为研究大跨度自锚式悬索桥主缆水平转向角度变化对锚固区梁段受力的影响,以济南大北环黄河特大桥为背景,进行有限元分析。采用Abaqus软件建立该桥不同主缆水平转向角度的锚固区梁段局部多尺度有限元模型,分析主缆轴力在桥梁纵向上的传递机理及其变化,以及锚固区梁段顶板纵向应力及主应力方向的差异。结果表明:主缆轴力从锚碇附近向外扩散,靠近锚碇的构件承担较大轴力,而远离锚碇的内腹板轴力较小;主缆水平转向角度对整体轴力分布影响有限,在锚碇周围10 m处轴力传递已基本趋于稳定;增大主缆水平转向角度使构件的主应力方向更接近桥梁纵向,提升了轴力传递效率,也造成了一定的应力集中,总体而言,影响是局部的。因此,合理选择主缆水平转向角度可减小梁体宽度、提高设计灵活性和轴力传递效率,同时需对可能出现应力集中的区域进行加强设计,以确保结构安全和经济性。
This study investigates the variation of horizontal steering angle of main cables on the load bearing performance of girder segments in anchorage zone of the long-span self-anchored suspension bridge.The Huanghe River bridge carrying a section of the Jinan North Ring Expressway is used as a case.Multi-scale local finite element models of girder segments in the anchorage zone under different main cable horizontal steering angles were established in Abaqus,to analyze the transfer mechanism and variation of main cable axial force along bridge length,and the differences in the longitudinal stress and principal stress directions of top plates of girder segments in the anchorage zone.The results demonstrate that the axial force of the main cable diffuses outward from the zone near the anchorage,the components near the anchorage bear greater axial force,while the inner webs that are far way from the anchorage carry small axial force.The influence of main cable horizontal steering angle on the overall axial force distribution is limited.Increasing the main cable horizontal steering angle allows the principal stress direction in the component to be nearer to the longitudinal direction of the bridge,which enhances the axial force transfer efficiency,but cause a degree of stress concentration.In general,the influence is local.At the location 10 m away from the anchorage,the axial force transfer is basically stable.Proper main cable horizontal steering angle is beneficial to the reduction of the stiffening girder width,and enhancement of the design flexibility and axial force transfer efficiency.In addition,the likely stress concentration zone should be strengthened to ensure the safety and economy of the structure.
作者
殷涛
周宁杰
马雪媛
刘聪聪
YIN Tao;ZHOU Ningjie;MA Xueyuan;LIU Congcong(Shandong Hi-Speed Construction Management Group Co.,Ltd.,Jinan 250031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250031,China)
出处
《桥梁建设》
北大核心
2025年第3期97-104,共8页
Bridge Construction
基金
国家重点研发计划项目(2022YFB3706702)。
关键词
自锚式悬索桥
主缆水平转向角度
锚固区梁段
受力分析
多尺度模型
有限元法
self-anchored suspension bridge
main cable horizontal steering angle
anchorage zone girder segment
mechanical analysis
multi-scale model
finite element method
