钢筋混凝土桁架拱桥,由于具有用料省、自重轻、整体性好、预制装配程度高及结构受力明确等特点,已得到了应有的重视并被逐渐推广使用。在引入预应力工艺以后,它的特点又获得了进一步的发挥。预应力配筋不仅使结构在荷载作用下只产生很小的拉应力,甚至没有拉应力,完全消除了在设计荷载作用下构件产生拉应力裂缝的可能性。而 Reinforced concrete truss arch bridge, due to the material province, light weight, good integrity, high prefabricated assembly and structural stress clear characteristics, has been given due attention and has been gradually promoted use. After the introduction of prestressed technology, its characteristics have been further played. Prestressed reinforcement not only makes the structure produce only a small tensile stress under the action of load, and even no tensile stress, completely eliminating the possibility of tensile stress cracks generated by the component under the design load. and