To investigate the flexural behavior of corroded steel beams strengthened by carbon fiber reinforced polymer (CFRP) plate, flexural test of five steel beams were carried out. The effects of corrosion and prestressing force levels on the flexural capacity, failure modes and interfacial stress were investigated. Meanwhile, considering the corrosion surface the calculation method of flexural capacity of corroded beams strengthened by CFRP plate was also established. The results showed that failure modes of corroded beams were the fracture of the CFRP plate after the shear failure of interface on the mid-span and fracture location of CFRP plate was mostly at the loading point. The rough surface of the corroded steel can enhance the efficiency of stress transfer at the interface, thereby improving the effective bond length of the interface. The shear stress was mainly concentrated on the CFRP plate end, and peak value appeared at the loading point. Compared the reference beam, the ultimate flexural capacity of the corroded beam strengthened by CFRP plate with 15% prestress level increased at a ratio of 21%, and utilization ratio of the CFRP plates was up to 71.59%.

为了研究碳纤维增强聚合物（CFRP）板加固的锈蚀钢梁的挠曲性能，进行了五种钢梁的挠曲试验。研究了腐蚀和预应力水平对弯曲能力，破坏模式和界面应力的影响。同时，考虑腐蚀面，建立了碳纤维布加固的腐蚀梁的抗弯承载力计算方法。结果表明：中跨界面剪切破坏后，CFRP板的断裂形式为锈蚀梁的破坏方式，CFRP板的断裂部位主要在加载点。腐蚀的钢的粗糙表面可以提高界面处的应力传递效率，从而提高界面的有效粘结长度。剪切应力主要集中在CFRP板端，峰值出现在加载点。与参考梁相比，预应力水平为15％的CFRP板加固的腐蚀梁的极限挠度以21％的比例增加，CFRP板的利用率达到71.59％。