马水河特大桥T形刚构桥设计

Design of T-Frame Bridge of Mashui River Bridge

马水河特大桥为(116+116)m的大跨度T形刚构桥。主梁采用变截面预应力混凝土箱梁,单箱单室直腹板,箱梁顶宽10.7 m,梁底缘按圆弧变化。主墩高108 m,墩身采用矩形空心高墩,墩顶不设实体段,与梁部按空间框架形式相接,桩基采用24-2.5 m钢筋混凝土钻孔桩,混凝土强度等级为C30,在墩底设置7.5 m高的导流堤。分别采用BSAS和ANSYS对全桥进行结构静力计算及空间静力和动力分析。分析结果表明:该桥静力、抗风、抗震、车桥动力响应验算结果均满足规范要求。该桥主墩墩身采用后倾式悬臂模板法施工,主梁采用对称悬臂浇筑法施工。

Mashui River Bridge is a long span T-frame bridge with span arrangement（116＋116） m.The main girder of the bridge is a prestressed concrete girder of variable section,having a single cell single box and vertical webs.The top of the girder is 10.7 m in width and the bottom varies in round arc.The main pier of the bridge is 108 m high and the pier shaft is the high-rise rectangular hollow pier that has no solid section close to the top of the pier and is connected with the girder in a way of spatial frame.The foundation for the pier is composed of 24 nos.of 2.5 m reinforced concrete bored piles,the concrete for the piles is of C30 and a 7.5 m high training dike is set at the footing of the pier.The BSAS and ANSYS are respectively used to conduct the structural static force calculation and spatial static and dynamic force analysis.The results of the calculation and analysis show that the static force,wind resistance,seismic resistance and dynamic response of the vehicle and bridge can all satisfy the relevant requirements in the codes.The pier shaft of the bridge is constructed by the backward inclined cantilever formwork and the main girder is constructed by the free balanced cantilever concreting method.