Prestressed CFRP laminate for reinforced bridge

General situation of the bridge

There are many cracks, serious diseases, insufficient traffic capacity, and need reinforcement.

Original design load steam 15, target design load steam 20

Reinforcement scheme

The main beam is attached to the prestressed CFRP laminate

Aat the bottom of the main beam, the position of the beam bottom about 30 cm from the bottom of the beam, and the carbon fiber board with the initial stress of 1 000MPa and the pasted area of 140 mm2.The tensile strength of carbon fiber plate is 2 800 MPa, the tensile modulus of elasticity is 165 GPa, and the ultimate tensile strain is 0.017.

After strengthening

The prestress of the prestressed CFRP reinforcement system has not changed obviously; the adhesive between the concrete and the carbon fiber board has not been significantly affected by the fatigue load and the environmental effect, and the bond is good. The internal force distribution of the bridge structure is obviously improved, the bearing capacity of the bridge is greatly improved, and the bearing capacity and deformation requirements are met. The target of strengthening design is that the deflection of the girder under the standard load is significantly reduced.