非对称扣挂施工钢箱提篮拱桥稳定性研究  

Research on the Stability of X-Style Arch Bridge Using Asymmetric Cable-Stayed Suspension Method

作　　者：千绍玉 QIAN Shaoyu(China Railway 15th Bureau Group No.3 Engineering Co.Ltd.,Chengdu Sichuan 641419,China)

机构地区：[1]中铁十五局集团第三工程有限公司,四川成都641419

出　　处：《铁道建筑技术》2024年第4期152-154,181,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2019-C14)。

摘　　要：大跨度钢箱提篮拱桥应通过适宜的施工工艺保障主体结构施工过程及成桥阶段安全性,其中对钢箱肋拱桥施工和成桥阶段的稳定性分析至关重要。本文以某钢箱提篮拱桥为背景,采用有限元方法建立全桥三维空间模型,对采用非对称扣挂施工的钢箱提篮拱桥的稳定性进行研究,分析拱桥在非对称缆索悬臂吊装的最不利状态下初始缺陷和扣索失效对稳定性的影响。结果表明:该桥在非对称扣挂施工阶段和成桥阶段稳定系数均满足规范要求;在施工阶段,拱肋最大悬臂阶段和拆除扣索阶段最容易发生失稳,但单根扣索失效对拱肋最大悬臂状态的稳定性影响不大;在成桥阶段,缺陷比例因子小于L/1000时,初始缺陷对第一阶稳定系数影响不大。The large-span steel box X-style arch bridge should ensure the safety of the main structure at the bridge completion and construction stages through appropriate construction techniques,and the stability analyses of steel box-rib arch bridges during the bridge completion and construction stages are of vital importance.Taking a basket-handle arch bridge with steel box rib as the research object,this paper established finite element models for the bridge completion and construction stages,studied the stability coefficients of the bridge under asymmetric cable-stayed suspension construction,and analysed the effects of initial defects and cable failure on the stability of the arch bridge in the most unfavourable state of the non-symmetrical cable cantilever lifting.The results show that:the stability coefficients of arch bridge at the bridge completion stage and construction stage satisfy the specification requirements;at the construction stage,the maximum cantilevering stage of the arch ribs and the removal of cables are most prone to destabilisation,but the failure of a single cable has little influence on the stability of the arch ribs at the maximum cantilevering state;at the bridge completion stage,the initial defects do not have much influence on the first-order stability coefficients when the proportion factor of defects is less than L/1000.

关 键 词：提篮拱桥 非对称扣挂施工 稳定性 初始缺陷 数值分析 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]