Abstract:
The analytical expressions of the ultimate buckling load about the neutral axis of the maximum moment of inertia for an H-shaped member wrapped by carbon fiber are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact of residual stress and non-residual stress in an H-shaped steel member wrapped by carbon fiber reinforced polymer (CFRP) under axial compressive load and bending moment is analyzed. When the given bending moment is within a certain range, the ultimate strength of CFRP reinforced steel members considering residual stress is much lower than that of CFRP reinforced steel members. However, when the given bending moment exceeds this range, the former is slightly higher than the latter. The ultimate strength of a CFRP reinforced compression-bending member affected by residual stress is always higher than that of steel members that is not reinforced and perfected. It also shows that CFRP wrapping can reduce the loss of strength caused by residual stress, which fully demonstrates the good strengthening effect of carbon fiber.