忠县长江大桥设计为钢管桁架加劲梁悬索桥 ,主跨为 5 6 0 m,全长 1199.73m,高塔薄壁 ,隧道式锚碇和岩锚 ,结构设计合理。尤其是钢管桁架加劲梁抗弯、抗扭较好 ,风荷载小 ,又无方向性影响 ,构造物轻巧美观 ,重量较钢桁梁轻 1/ 3,较钢箱梁轻 1/ 2 ,该桥型在节省材料、缩短工期、降低造价方面具有优越性 The Zhongxian Yangtze River Bridge is designed as a steel-truss stiffening girder suspension bridge with a main span of 560 m and a total length of 1199.73 m. The tower is thin-walled, with tunnel-type anchors and rock anchors. The structural design is reasonable. Especially, the steel truss stiffening girder has better bending and torsion resistance, less wind load and no directional influence. The structure is light and beautiful, the weight is 1/3 lighter than the steel truss and 1/2 lighter than the steel girder. Save material, shorten the construction period, reduce the cost advantages