文章针对某薄壁小箱梁的病害,根据检测结果对该桥承载能力现状进行了评定。通过同类桥型的构造对比探究产生病害的内在原因,从施工、受力、荷载等几个方面分析了产生病害的外在原因,并提出相应的加固方案。对于水平粘贴钢板的抗剪加固效果如何计算进行探讨。 In this paper, aiming at the disease of a thin-walled box girder, the status quo of the carrying capacity of the bridge is evaluated according to the test results. Through the comparison of the structure of similar bridges to explore the inherent causes of diseases, from the construction, stress, load and other aspects of the external causes of the disease is analyzed and the corresponding reinforcement programs are proposed. How to calculate the shear reinforcement effect of horizontal steel plate is discussed.