沪太路飞云桥开口截面组合钢箱梁设计要点

Design Essentials on Open-section Composite Steel Box Girder of Feiyun Bridge in Hutai Road

摘要:

沪太路飞云桥为主跨125 m跨径的开口截面组合连续梁桥，分幅布置，单幅桥宽为15.75 m，采用上下分层、人行道外挂的结构形式。主梁为大挑臂单箱单室组合连续钢箱梁，横隔系除支点处采用实腹式横梁外，其余位置均采用空腹式横隔板，采用少支架钢梁节段拼装、桥面板先跨中后支点的间断施工法。分析总结了大跨径开口截面组合连续钢箱梁的总体布置、结构概况、施工方法及设计要点，并对比了边中跨比较小情况下边支点压重和顶升处理方式对结构受力的影响，研究成果可为同类桥梁的设计提供借鉴。

Abstract:

The Feiyun Bridge in Hutai Road is an open-section composite continuous girder bridge with a main span of 125 m. It is arranged in two separate sections, and a single section width is 15.75 m. Its structural form is the upper and lower layers, and outside-hung sidewalk. The main girder is a large-cantilever single-box single-cell composite continuous steel box girder. The solid-web beam is adopted at the fulcrum for the diaphragm system, the open-web diaphragm plate is used at the rest positions. The discontinuous construction method of steel beam segment assembly with less support and bridge deck slab first span middle and then fulcrum is adopted. The overall layout, structural overview, construction methods and design essentials of the long-span open-section composite continuous steel box girder are analyzed and summarized. The influence of side fulcrum compression and jacking treatment on the structural force is compared in the case of small side midspan ratio, which can provide reference for the design of the similar bridges.