曲线条件大跨度拱加劲连续梁设计

Design of Long Span Arch Stiffened Continuous Beam with Curved Conditions

贵南高铁二塘双线特大桥采用90m+180m+90m拱加劲连续梁结构。大桥位于曲线上,梁体采用分段直线布置,悬灌施工;主拱采用哑铃形钢管混凝土拱肋,钢管直径1 m,拱肋全高3 m;采用整束挤压钢绞线吊杆,全桥拱设置36组吊杆;纵向活动主墩通过构造措施,形成半刚构结构体系,限制部分梁体问题伸缩变形;大桥采用先悬灌主梁,后在主梁上搭设支架原位拼装拱肋方式施工。经论文研究计算结果表明,该桥刚度、受力等均满足规范要求。

The 90 m+180 m+90 m arch stiffened continuous beam structure is adopted in Ertang double-track bridge of Guizhu-Nanning High-Speed Railway.The bridge is located on the curve,the beam body adopts the sectional linear arrangement,suspension irrigation construction.The main arch adopts dumbbelltype concrete filled steel tube arch rib,steel pipe diameter I m,arch rib full height 3 m.A whole bunch of extruded steel strand suspender is adopted,and 36 groups of suspender are set up in the whole bridge arch.Through structural measures,the main pier with longitudinal movement forms a semi-rigid structure system,which restricts the expansion and deformation of some beam bodies.The bridge is constructed by suspendingthe main beam first,and then setting up brackets on the main beam to assemble arch ribs in situ.The calculation results show that the stiffness and force ofthe bridge meet the standard requirements.