金山大桥局部拆除后续运营期性能和实测分析

摘要:

因航道升级和改建施工的保通需求,上海金山大桥在拆除之前需局部切割拆除并维持一年续运营期,安全风险显著提高,且同类工程实例较为罕见。利用有限元软件建立双梁连续约束模型,模拟金山大桥局部翼缘拆除全过程,形成局部拆除监测预警等级和预警值,分析了部分拆除后的续运营期旧桥挠度和应力监测数据,监测结果表明结构刚度稳定,实测应力均小于理论控制值,可为今后类似工程提供借鉴。

Abstract:

For the channel upgrade and the requirements to maintain traffic in the reconstruction of the old Jinshan bridge in Shanghai, the bridge is partially cut before it is demolished and maintained for a one-year re-operation period. The safety risk is significantly increased, and similar engineering examples are extremely rare. A double-beam continuous restraint model is established using FEM software to simulate the process of the partial demolition of Jinshan Bridge"s partial flanges. And analysis results are formed to early warning levels and early warning values during monitoring. The deflection and stress monitoring data of the old bridge during the re-operation period after partial demolition were analyzed. The monitoring results showed that the rigidity of the structure is stable, and the measured stress is less than the theoretical control value, which can provide a reference for similar projects in the future.