| Prestressed Concrete Truss Arch Bridge was brought forward by the Communications Department of Guizhou Province in late seventies of last century, and the first PC Truss Arch Bridge was designed and constructed in 1981. PC Truss Arch Bridge has been promoted nationwide application for its compact structure, fewer materials, less investment and so on. Because the early development of Truss Arch Bridge was too fast, the study on structure especially structure details was not enough. Since construction technology as well as design experience was not mature enough, its structural had own defects, PC Truss Arch Bridge had problems such as poor capacity, low strength, the overall weak stability and so on, which led to different damage after been used for two or three decades. So it is great practical significant to find an economical, practical and effective reinforcement technology.The typical damage of PC Truss Arch Bridge has been summarized in this paper,and analyzed its characteristics and reason of damage. The different reinforcement technologies of PC Truss Arch Bridge also has been summarized in this paper, and brought forward external Prestressing Reinforcement program as well as the method of increasing arch cross-section at the same time to prevent the continued deflection. External Prestressed structure system, mechanical features and design features were also studied. The DuGe Bridge in ctiy of LiuPanshui Guizhou province as a research background in this paper, according to the disease characteristics and the use of deflection, stress fitting model for the establishment of structural damage model. And reinforced with externally prestressed, Structural Analysised. Through comparison internal force, stress of control section before and after the structural reinforcement. Shows that the method can significantly improve reserves of the original bridge stress, can effectively prevent the continued midspan-deflection, and appropriate restoration of the geometry.
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