钢结构中承式斜靠拱桥设计

Design of Steel Structure Half-Through Leaning Arch Bridge

京杭大运河昌运桥主桥采用130 m跨钢结构中承式斜靠拱桥。主拱、副拱均采用变高度钢箱截面以适应拱圈内力变化,主、副拱之间设11道横撑。桥面系采用钢结构“纵横格子梁+正交异性桥面板”的形式。吊杆采用高强度低松弛镀锌平行钢丝索。该桥为有推力体系,推力由大直径群桩基础承担。主桥采用斜拉扣索吊装法施工,确保桥梁施工期间正常通航。采用空间有限元软件MIDAS Civil对该桥的静、动力性能进行分析,计算时考虑桩土相互作用,结果表明各项指标均满足规范要求。

The main bridge of Changyun Bridge of Beijing-Hangzhou Grand Canal is a steel structure half-through leaning arch bridge with a span of 130 m.To adapt to the changes in the internal force of the arch ring,both the main arch&the auxiliary arch adopt variable-height steel box sections,and 11 transverse braces are set between the main&auxiliary arches.The bridge deck system adopts the form of steel structure vertical&horizontal lattice beam+orthotropic bridge deck.The suspender adopts high strength&low relaxation galvanized parallel steel wire rope.The bridge is a thrust system,and the thrust is borne by the large-diameter pile group foundation.The main bridge is constructed by cable-stayed cable hoisting method to ensure normal navigation during bridge construction.The static&dynamic performance of the bridge is analyzed by MIDAS CIVIL,and the pilesoil interaction is considered in the calculation.The results show that all indexes meet the requirements of the code.