跨海单索面钢混组合梁斜拉桥设计关键技术

Key Design Techniques of Single-plane Steel-concrete Composite Girder Cable-stayed Bridge for Crossing Sea

摘要:

富翅门大桥主桥采用57 m+108 m+340 m+108 m+57 m双塔单索面钢混组合梁斜拉桥。主梁采用单箱三室钢混组合梁，标准段宽度27.5 m，主桥岑港侧边跨位于互通变宽段，主梁变宽至35.5 m，主梁采用节段预制、悬臂拼装施工。采用Midas/civil分析软件建立有限元模型，对桥梁施工中最大悬臂阶段、运营阶段进行抗风稳定性分析。为提高海洋环境下的结构耐久性，对海工混凝土性能、钢筋保护层厚度、混凝土外加剂、钢梁除湿及防腐涂装等提出了明确要求，并设置了完善的维护和检修设施。

Abstract:

The main bridge of Fuchimen Bridge is a 57 m + 108 m + 340 m + 108 m + 57 m double-pylon single-plane steel-concrete composite girder cable-stayed bridge. The main girder is a single-box three-cell steel-concrete composite girder. The standard section is 27.5 m wide. The side span is located in the interchange widening section and the main girder is widened to 35.5 m. The segmental precasting and cantilever assembling are used to construct the main girder. The finite element model is established by using a analysis software of Midas/civil to carry out the anti-wind stability analysis in the maximum cantilever stage and operation stage of bridge construction. To ensure the structural durability in marine environment, the performance of marine concrete, the thickness of reinforced protective layer, the concrete admixture, the dehumidification of steel girder and the anti-corrosive coating are clearly required. And the perfective maintaining and service facilities are set up.