体外预应力加固桥梁结构是一种效果较好、使用较广的方法。它是在桥梁结构的受拉区施加体外预应力,使其产生与原桥的不利弯矩方向相反轴向压力和弯矩,以抵消部分自重应力减小活载应力,从而提高桥梁的承载能力。简要介绍了桥梁体外预应力加固的常用方法,并对体外预应力结构体系的力学特征、配筋设计、计算方法及结构检算方法进行了系统的分析。 External prestressed reinforcement of the bridge structure is a better, more widely used method. It imposes prestress in the tension zone of the bridge structure so that it produces axial pressure and bending moment opposite to the unfavorable moment direction of the original bridge so as to counteract the partial self-weight stress and reduce the live load so as to improve the carrying capacity of the bridge . This paper briefly introduces the commonly used methods of external prestressed reinforcement of bridges and systematically analyzes the mechanical characteristics, reinforcement design, calculation methods and structure checking methods of external prestressed structural systems.