摘要
【目的】以黄河三峡大桥为背景,研究自跨中向两侧和自回转锚碇向桥塔两种不同架设顺序方案的结构反应,以解决独塔地锚回转缆悬索桥钢桁梁架设问题。【方法】通过建立空间有限元模型模拟钢桁梁架设过程,在主缆位移、主梁线形、下弦杆开口量、刚铰转换、索鞍顶推、主缆吊索内力及主梁应力等方面进行对比分析。【结果】对于两种架设顺序,主缆及钢桁梁的线形呈现出不同的规律,主缆及吊索内力变化与架设顺序关联不大,索塔顶推次数及时机与架设的梁段位置及数量有关。在选择合理的刚铰转换及索鞍顶推方案的情况下,两种架设顺序均可保证架梁过程中主梁结构受力、成桥线形满足设计与规范要求,对于自跨中向两侧吊装的方案,悬索桥各构件的反应更小,架设效率更高。【结论】背景项目已成功应用本文研究成果完成架设,该成果也可为后续同类悬索桥的架设提供参考。
[Purposes]To solve the erection problem of the steel truss girder of single-tower groundanchored suspension bridge with slewing cable,taking the Three Gorges Bridge on the Yellow River as the background,this paper studied the structural responses of two different erection sequence schemes from the middle of the span to both sides and from the slewing anchor to the tower.[Methods]By establishing a spatial finite element model to simulate the erection process of steel truss girder,comparative analysis was made on the displacement of main cable,the alignment of main beam,the opening amount of lower chord,the conversion of rigid hinge,the pushing of cable saddle,the internal force of main cable sling,and the stress of main beam.[Findings]The alignment of the main cable and steel truss girder in the two erection sequences presents different laws.The internal force changes in the main cable and sling have little correlation with the erection sequence,and the number and timing of cable tower pushing are related to the position and number of erected girder segments.Selecting a reasonable rigid hinge conversion and cable saddle pushing scheme,the two erection sequences can ensure that the stress of the main beam structure and the completed bridge alignment meet the design and specification requirements in the process of girder erection.The lifting scheme from the middle of the span to both sides of the suspension bridge has a smaller response and higher erection efficiency.[Conclusions]The project has successfully applied the research results and completed the erection,which can provide a reference for subsequent similar suspension bridges.
作者
付立宏
张伟超
朱硕
吴汉立
节贺
FU Lihong;ZHANG Weichao;ZHU Shuo;WU Hanli;JIE He(Engineering Technology Institute of China Railway No.4 Engineering Group,Hefei 230022,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;The First Engineering Co.,Ltd.of CTCE Group,Hefei 230041,China)
出处
《交通科学与工程》
2025年第6期93-100,共8页
Journal of Transport Science and Engineering
基金
国家重点研发计划资助项目(2024YFB2605500)
中铁四局集团有限公司科技研发项目(2023-06)。
关键词
悬索桥
回转缆
架设顺序
刚铰转换
结构反应
suspension bridge
slewing cable
erection sequence
rigid hinge conversion
structural response
