Does Carbon Fiber Wrap Add Strength of The Structures?

Yes, of course. Carbon fiber itself is a high strength material. High strength, high modulus, unidirectional carbon or bidirectional fiber fabrics to be used with carbon fiber adhesive to form carbon fiber reinforced polymers (CFRP) used to improve the structures strength.

CFRP strengthening method can play different strengthening roles for different components.

First of all, the higher tensile strength of carbon fiber cloth can effectively replace or supplement the tensile performance of reinforcement and improve the bearing capacity of flexural members by pasting carbon fiber cloth to the bottom tensile area in the reinforcement of flexural members, such as beams and slabs. In addition, in the opening of floor slab, if the opening has little impact on the slab, carbon fiber cloth can also be pasted around the opening as a post compensation reinforcement for reinforcement.

On the other hand, CFRP can also play a similar role as stirrups to strengthen concrete members against shear. Shear resistance can be strengthened by pasting carbon fiber cloth U-shaped hoop on the beam, or pasting carbon fiber cloth annular hoop perpendicular to the axis direction on the column. In shear reinforcement, it is necessary to pay attention to the structural measures of different components to meet the requirements, and the edges and corners of beams and square columns must be polished into a circular arc to prevent stress concentration from affecting the mechanical performance of carbon fiber cloth.

Carbon fiber cloth can also be used to strengthen axial compression members and large eccentric compression members respectively by circumferential confinement or pasting to the tensile edge along the axis. When the ductility of reinforced concrete is insufficient and seismic strengthening is required, carbon fiber cloth circumferential confinement can also be used for strengthening. For small eccentric compression members and walls, CFRP can only bear the tensile stress but not the pressure, so it will not play a role in the compression reinforcement of both.