The composite adhesive repairing and strengthening technology has many advantages such as fast fix speed, less weight gain, high efficiency and reliability et al., which has become a new technology for repairing and strengthening the concrete structure. In this study, the mechanical properties of the unstrengthened and strengthened RC bridge structures were analyzed and compared by using finite element method (FEM). Besides, the effect of the quantities of the prepreg tape, the fiber orientation, the material type and the lay-up sequence on the mechanical properties of the composites strengthened RC bridge structures were studied. The simulation results show that the internal maximum stress, maximum strain and maximum deformation of the strengthened RC bridge structure decreased clearly, which least can decreased by 60%, 56% and 11%, respectively, in comparison to the unstrengthened RC bridge structure. Furthermore, it is found that the mechanical properties are obviously influenced by the quantities of the prepreg tape and the fiber orientation, but slightly influenced by the material type and the lay-up sequence. The best reinforcement scheme is that lay-up material all adopt CFRP, 5 prepreg tapes, [0]₄ lay-up angle. For this strengthened RC bridge structure, the maximum stress, maximum strain and maximum deformation of the bridge is 81.7 MPa, 0.27% and 15.96 mm, respectively.

composite  /  strengthen  /  RC bridge  /  finite element method  /  mechanical property