高速铁路主跨420 m钢箱拱桥设计方案研究

Research on Design Scheme of Steel Box Arch with Main Span 420 m for High Speed Railway Bridge

为满足西安至十堰高速铁路汉江特大桥420m中承式钢箱拱桥方案的设计要求,对影响大跨钢箱拱受力的矢跨比、拱轴系数、拱肋内倾角、横撑布置数量及位置等关键参数进行比选,提出了适合于本桥的设计参数。通过合理设置拱脚混凝土段长度,显著减小了钢箱拱桥的用钢量,提高了钢箱拱桥方案的竞争力。静动力计算分析表明,大跨钢箱拱桥可满足高速铁路运营需求。

In order to meet the design requirements of the 420 m through type steel box arch of Hanjiang super largebridge of Xi’an-Shiyan high speed railway,the key parameters affecting the stress of the large span steel box arch werecompared and selected,including the ratio of rise to span,the coefficient of arch axis,the inclination angle of arch rib,the number and position of transverse braces,and the design parameters suitable for the bridge were put forward. Byreasonably setting the length of the concrete segment of the arch foot,the steel consumption of the steel box arch bridgeis significantly reduced,and the competitiveness of the scheme of the steel box arch bridge is improved. The static anddynamic analysis results show that the large span steel box arch bridge can meet the operation requirements of highspeed railway.