一、前言七十年代以来,由于科学技术的进步,工业水平的提高,人类社会文明的发展,桥梁工程日新月异。随着时代前进的步伐,人们对桥梁建筑提出了更高的要求,对“适用、安全、经济、美观”的桥梁赋以更新的内容。纵观世界桥梁建筑发展的历史,兹将各种典型桥梁型式,如悬索桥、悬臂桁架桥、斜拉桥、桁架桥、连续梁桥,最大跨径发展变 I. Preface Since the 1970s, due to the progress of science and technology, the improvement of the industrial level and the development of civilized society, the bridge project is changing with each passing day. With the progress of the times, people have put forward higher requirements for bridge construction and given newer content to the bridge of “applicable, safe, economical and beautiful”. Throughout the history of the development of the world’s bridge construction, we will be a variety of typical bridge types, such as suspension bridges, cantilevered truss bridges, cable-stayed bridges, truss bridges, continuous girder bridge, the maximum span development