桥梁结构体系是桥梁工程中的重要教学内容。常规教学方法是根据教材内容，逐一讲解结构体系，不仅效果差，而且缺乏系统性和内在连贯性。文章从简支梁桥弯矩图出发，围绕如何减小梁内弯矩、增大桥梁跨度，推演出桥梁工程中所有的结构体系。

Teaching contents of bridge structural systems are very important in bridge engineering course. Of the traditional teaching method, the structural systems are independently explained according to the text content. The teaching effect is poor, non-systematic, and inconsistent. Starting from the moment diagram of the simple-supported beam bridge, we presented how to reduce the bending moment of beam and performed evolution of all bridge engineering structural systems.

重庆市高等教育教学改革研究项目(103140);中国交通教育研究会教育科学研究课题(交教研1002 - 93)