一、概 述 梁式桥是一种在竖向荷载作用下无水平反力而以受弯为主的桥梁结构。 18世纪后期,硅酸盐水泥得到了发展,钢材质量的不断提高以及结构理论的日趋完善,使得钢筋混凝土作为一种理想的抗弯结构的新材料,获得了大量的实践和发展。特别是1928年法国工程师弗莱西奈使预应力混凝土结构获得成功以后,由于高强材料的合 First, an overview Beam bridge is a kind of vertical load without horizontal reaction to bending the main bridge structure. Portland cement has been developed in the late 18th century. The continuous improvement of the quality of steel and the improvement of the structure theory make the reinforced concrete get a lot of practice and development as an ideal new material with flexural structure. Especially after the French engineer Flesini in 1928 made the prestressed concrete structure successful, due to the combination of high-strength materials