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某桥主桥上部结构为下承式预应力混凝土桁架梁,标准跨径为82米,细杆轴线为R=2400米的圆凸曲线,上弦杆轴线抛物线方程:y=0.8x-o0.01x2,计算矢跨比1/5,上弦杆高度为100cm,宽为160cm,下弦杆跨中高度为220cm,宽为140cm;下弦杆支点处高度为240cm,宽为160cm;吊杆采用每节点两根,每根截面为80*25cm预应力混凝土结构。本文结合工程施工实际,分析了钢筋混凝土下承式桁架拱桥施工中的承载力、拱桥防开裂、预压材料选择等方面问题。
The superstructure of a bridge main bridge is a through-going prestressed concrete truss girder with a standard span of 82 m and a convex axis of R = 2400 m with a thin rod axis. The parabolic equation of the winding rod axis is y = 0.8x-o0.01x2 , Calculate the pitch ratio of 1/5, the winding rod height of 100cm, width of 160cm, the middle span of the lower chord is 220cm, width 140cm; lower chord fulcrum at a height of 240cm, width 160cm; boom with two per node , Each section is 80 * 25cm prestressed concrete structure. In this paper, combined with the actual construction, analysis of the reinforced concrete floor truss arch bridge construction capacity, arch cracking prevention, pre-press material selection and other issues.