Abstract:With the rapid development in the era, the number of buildings using steel structure systems increases rapidly. To consider that H-shaped steel columns of steel structure were adapted in many buildings, the column members of the buildings may be ageing, or the bearing capacity of steel column in the building itself may be insufficient after function changed. Therefore, the theoretical derivation on the biased compression H-shaped steel column strengthened with carbon fiber reinforced plastic and experimental research work was conducted in this paper. The carbon-fiber-reinforced polymers area was converted into the corresponding steel area through the reference to the existing standards and adopting the idea of equivalent generation. The ultimate bearing capacity calculation formula of the biased H-shaped steel column strengthened with carbon-fiber-reinforced polymers is derived. And the calculation result of theoretical derivation was compared with the observation results of actual experiment. The biases between the calculated value and the experimental value are stable within a specific range, which proved the accuracy of the formula calculation. The influence of CFRP strengthened layers on different carbon-fiber-reinforced polymers and different eccentricities on ultimate bearing capacity of strengthened H-shaped steel columns was discussed in this paper. Studies show that: biased compression H-shaped steel columns strengthened with carbon-fiber-reinforced polymers under eccentric compression can increase the bearing capacity of the steel columns. However, as the number of layers of carbon fiber-reinforced polymers increases, the bearing capacity amplitude will gradually decrease. The strengthen effect of carbon-fiber-reinforced polymers on specimens with larger eccentricity is stronger than that of specimens with smaller eccentricity. Through the theoretical derivation and experiments, it shows that the carbon fiber cloth strengthen method is one of the better methods to strengthen the steel members under conditions that hardly affect the mechanical performance of original steel members.