武汉市杨泗港快速通道转体斜拉桥设计

武汉市杨泗港快速通道转体斜拉桥为我国首座半漂浮体系独柱塔转体斜拉桥,孔跨布置为(40+88+252+88+40) m。主桥按双向八车道设计并考虑两侧设置人行道,转体质量约1. 75万t,转体半径124 m。主梁为整幅钢箱梁,采用中央双索面,桥塔为独柱形钢筋混凝土结构,斜拉索采用高强度平行钢丝。对主桥地理位置、桥型方案选择、结构设计构造及计算分析进行详细阐述,使用有限元软件对主桥进行整体静力计算、转体结构计算、抗震分析及稳定分析。计算结果表明:本桥各构件受力良好,结构安全可靠,桥梁具有良好的静动力性能。独柱宽幅中央索面转体钢箱梁斜拉桥具有良好的经济性和美观性,可为上跨铁路桥梁桥式方案提供借鉴并可进一步推广。

Design of Rotating Cable-stayed Bridge of Yangsigang Expressway of Wuhan City

The rotating cable-stayed bridge of Yangsigang Expressway of Wuhan is China 's first semi-floating structural system cable-stayed bridge with single-column pylon. The span arrangement is(40+88+252+88+40) m. The main bridge is designed in bi-direction with eight lanes and the sidewalks are set on both sides. The weight of rotation is about 17 500 t and the rotating radius of the bridge is124 m. The main girder is of whole steel box girder with central double cable planes,the pylon of the bridge is single-column reinforced concrete structure and the high strength parallel steel wires are used in the stay cables. This paper expounds the design features of the bridge,the location of the main bridge,the selection of the bridge scheme,the structural structure and conducts calculation and analysis. The static calculation,rotating structural calculation,seismic analysis and stability analysis of the main bridge are carried out by using finite element software. The calculation results show that the components of the bridge are safe and reliable with good bearing capacity and the bridge has good static and dynamic performances. The wide steel box girder cable-stayed bridge with single-column pylon and central double cable planes is proved economic and aesthetic and it can provide reference for the design of overpass railway bridge and further promotion.