How Much Bearing Capacity Can Be Increased By Carbon Fiber?

How Much Bearing Capacity Can Be Increased By Carbon Fiber Reinforcement?

carbon fiber for improve bearing capacity

There are many reinforcement methods that can be used in reinforcement construction.

At present, many carbon fiber reinforcement and steel bonding reinforcement are carried out on the basis of the original components, and the section size and concrete strength grade of the original structure limit the extent of their role. When many people use carbon fiber reinforcement, they do not know how much bearing capacity can be improved by carbon fiber reinforcement? Now we will introduce how much bearing capacity can be improved by carbon fiber reinforcement.

When the reinforced concrete structural members are strengthened by sticking steel or carbon fiber cloth, the bending bearing capacity of the normal section shall not be increased by more than 40%, and the shear bearing capacity shall be checked and calculated to avoid that the shear failure of the members will precede the bending failure due to the increase of the bending bearing capacity. The purpose is to control the crack width and deformation of reinforced members, and also to emphasize the importance of the design principle of "strong shear and weak bending".

STRENGTHENING RC COLUMNS WITH CFRP

Assuming that the bending moment that members can bear before reinforcement is M0, the maximum bending moment Mj that can be supplemented by carbon fiber reinforcement can be calculated in advance, that is, Mj=Mb-M0. That is to say, if the difference between Mb and M0 is small, the effect of carbon fiber bending reinforcement is limited, and pasting more carbon fibers can not improve the bending capacity, but can only lead to super reinforced sections that are not allowed by the specification.

In terms of construction, the thickness of bonded steel or carbon fiber cloth should not be too thick. For the bonded steel, the reinforcement amount of the bonded steel plate shall not exceed 3 and 4 layers respectively for the tension area and compression area, and the total thickness of the steel plate shall not exceed 10mm. However, the reinforcement amount of bonded carbon fiber cloth shall not exceed 2 layers for preformed plates and 4 layers for wet laid fabrics. When the number of layers exceeds 4, carbon fiber plate shall be considered for reinforcement and reliable anchoring measures shall be taken.