Abstract: The dainage of bridge structure is brought by vehicle's overloading，based oil crack theory.Damage evaluate and the method of diagnose of great highway bridge structure by over loading is brought．the feasibility project is brought'about the reinforcement and servicing after bridge structure was damaged.

Key words: highway bridge, over loading , crack, damage, servicing

摘要： 车辆超载引起桥梁结构损伤，基于裂缝理论提出了公路桥梁超载损伤评估及诊断方法，并对桥梁结构损伤后 的加固维修提出了可行性方案．

关键词: 公路桥梁, 超载, 裂缝, 损伤, 维修