大跨度混凝土斜拉桥拆除施工过程的结构分析

Structural Analysis of Demolition Construction Process of Large Span Concrete Cable-stayed Bridge

以上海市泖港大桥老桥中跨200 m的混凝土斜拉桥为例,介绍了老桥拆除施工过程结构分析的主要思路与内容。经过仔细地分析与比较,确定了老桥拆除前的结构基准状态。通过对主跨主梁切割节段的浮吊力、斜拉索切割顺序、悬臂节段切割长度、主塔拆除时机的分析,优化了老桥拆除的施工方案,确保了结构及拆除施工的安全。

Taking the concrete cable-stayed bridge with a middle span of 200 m of the old bridge of Maogang bridge in Shanghai as an example,the main ideas and contents of structural analysis during the demolition construction of the old bridge are introduced.After careful analysis and comparison,the structural reference state before the demolition of the old bridge is determined.Through the analysis of the floating crane force of the main span main beam cutting section,the cutting sequence of stay cable,the cutting length of cantilever section and the demolition time of main tower,the construction scheme of old bridge demolition is optimized to ensure the safety of structure and demolition construction.