一、问题的提出 有推力桥跨结构对于节省钢材仍是有效的型式之一,但它要求地基有较高的承载能力及上部构造有较大的建筑高度,这是个矛盾。国内自一九五九年来陆续在各省、区普遍修建了轻台拱桥,对解决这个矛盾有一定的成效,但由于拱的抗位移能力较低,所以一些轻台拱桥当桥台位移到某一程度时导致拱圈开裂,尤其是矢跨比坦于1/10的拱圈开裂更为严重。遇到建筑高度较小、地基承载能力较低的情况时,仍往往有赖于梁式结构。 First, the issue put forward Thrust bridge structure is still one of the effective ways to save steel, but it requires a higher foundation carrying capacity and the upper structure has a larger height of the building, which is a contradiction. Since 1959, many light-duty arch bridges have been built in various provinces and districts in succession in China, which has achieved some success in solving this contradiction. However, due to the low anti-displacement ability of the arch, To a certain extent, the cracking of the arch ring is caused, in particular, the arch spanning more severely than the 1/10 arch rib. In the event of a low building height and a low foundation carrying capacity, the beam structure is often still dependent.