先简支后连续T梁是国内外高速公路上常用的一种桥梁结构新形式,具有施工简易、行车条件好且经济合理,并兼备简支梁与连续梁桥的优点.以三跨预应力混凝土先简支后连续T梁为例.简要介绍某高速公路中广泛采用的先简支后连续梁桥的结构设计特点和计算方法. The first simply supported continuous T-beam is a new form of bridge structure commonly used on domestic and international freeways, with the advantages of simple construction, good driving conditions and economic rationality, as well as the advantages of both simple supported beam and continuous beam bridge. The concrete beam with simple support and continuous T beam is taken as an example.The structure design characteristic and calculation method of the first simply supported continuous beam bridge which is widely used in a highway are introduced briefly.