At present, in the process of civil engineering reinforcement design and construction in China, most of the application of carbon fiber reinforcement technology is the traditional non prestressed carbon fiber fabric or plate bonding process, that is, using the excellent tensile strength of carbon fiber products to strengthen the bridge structure.

However, the stress level of the reinforced material will always be lower than the stress level of the original structural member, and the stress lag is produced because the original structure has been in a strong stress action before strengthening. At the same time, because the elastic modulus of the carbon fiber sheet is about 80% of the steel bar (HRB400), the elongation at the yield of the steel bar is in the same order of magnitude as the yield of the steel bar. When the bearing capacity of the original member reaches its limit of failure, the ultimate strength of the reinforcing material is far from reaching its ultimate bearing capacity, resulting in the corresponding waste. In addition, the joint working capacity of the reinforced structure and the original structure varies greatly under the additional load because of the different structural handling and construction techniques. The resulting uncertainty is also one of the problems.

For the problems brought about by the strengthening of carbon fiber reinforced material, the reinforcement method of Prestressed CFRP laminate can be solved by applying a pre stress to the carbon fiber plate, and then anchoring it on the reinforced component.

(1) giving full play to the bearing capacity of reinforcing materials and eliminating the stress hysteresis.

(2) combined with the surface treatment method, the overall strength of the reinforced component and the original member under additional load is increased.

(3) change the internal force distribution of the original structure and reduce the stress level of the original structure.

(4) decrease the original structural deformation reduces the stress concentration.

(5) long term corrosion resistance and stable chemical properties.

(6) the mechanical properties are stable, the stress relaxation level is low, and the creep resistance is strong.

(7) the construction process is simple and the number of variables is small. The precise control and calculation can be achieved by controlling the relationship between tension stress and elongation.