钢筋混凝土桁架拱桥是一种结构轻巧、整体性好、施工快和造价低的桥型。十多年来已在广大地区采用,在基土松软的平原地区尤为适宜。但是桁架拱桥配用的钢筋量与双曲拱桥相比,还是比较多的,尤其是跨中断面和桁架斜拉杆的配筋更多,是一个缺点。为了提高桁架拱桥的性能,充分发挥拱的作用,减少配筋量,我们采用了桥面微弯 Reinforced concrete truss arch bridge is a lightweight structure, good overall, fast construction and low cost bridge. For more than a decade, it has been adopted in vast areas and is especially suitable in the soft plains of base soil. However, the amount of steel bar used in truss arch bridge is still relatively large compared with that in double curved arch bridge, especially the reinforcement of the cross-section and the truss diagonal pull rod is a disadvantage. In order to improve the performance of truss arch bridge, give full play to the role of the arch, reducing the amount of reinforcement, we use a micro-bending