Abstract:In order to study the influence of the thickness of the steel plate and the eccentricity on load-carrying behavior of the steel beam-column after strengthening by the steel plates, the static test of four strengthened steel beam-column and one comparative unreinforced steel beam-column was conducted. The Q235B hot-rolled middle flange H section is used. The reinforcement method is that the flange was symmetrically bonded to the outside of the flange and was fully reinforced. Cylindrical hinges were used at both ends of the column to achieve eccentric compression in the plane of the steel column. The displacement variation, the strain distribution of the web, the strain change between the steel flange and the steel plate, as well as the buckling mode and the ultimate bearing capacity were discussed. In addition, the test results were compared with the theoretical calculation results. The experimental results show that the reinforcement method of sticking steel plates on the flange can effectively improve the out-plane stability bearing capacity of the steel beam-column. The plasticity of the the web section of the steel beam-column after reinforcement is more obvious. the eccentricity is the main factor affecting the stability bearing capacity of the steel beam-column after reinforcement. Besides, the smaller eccentricity is beneficial to the joint work between the steel plate and the section steel through the bond layer.