Carbon fiber structural reinforcement

Engineering survey

A high-rise residential district near the Hacun interchange in Guangzhou has been built and used for many years. However, a main beam in the negative basement of the residential district has been found recently. A long crack appears at the bottom of the beam along the beam width direction and extends to the 30mm height of the beam, and there are signs of further expansion.

Cause analysis

Through investigation and analysis, it is found that the district management office leases the first floor berth to others to do steel business, and the lessee piles up a large amount of steel on the first floor. Obviously, the main reason for the cracking of the beam is that the actual load applied on the beam greatly exceeds its design load, resulting in structural cracks due to insufficient bearing capacity.

Structural reinforcement scheme

Because the crack is caused by the insufficient bearing capacity of the structure, reinforcement measures must be taken. However, the basement as a residential parking lot, strict requirements for the net height, the requirement of reinforcement measures can not significantly reduce the floor net height, after many analysis and comparison, ultimately decided to use carbon fiber structural reinforcement technology.

Technical characteristics of carbon fiber reinforcement and retrofitting

1. The reinforcing material is thin and light, hardly increasing the original structure size and its own quality.

2. Construction is simple and fast.

3. The corrosion of acid and alkali salt medium has wide application.

4. It can effectively seal the cracks in the concrete structure and extend the service life of the structure.

5. It is easy to keep the structure intact.

6. The carbon fiber sheet has good durability.

Effect of carbon fiber reinforcement and retrofitting

After the completion of the reinforcement project, no deformation beyond the requirements of the code and no new cracks have been found after three months of deformation observation under normal service conditions. From the practical application of the structure reinforcement project, the use of carbon fiber reinforcement technology to achieve the purpose of strengthening the structure, while the floor height has little impact, does not affect the use of building functions, achieved good results.

Epilogue

Carbon fiber reinforced concrete is widely used in reinforcement of concrete structures, and its effect is obvious. Because the reinforcing material is thin and light, it hardly increases the original structure size and its own quality. In many cases, it can achieve special results, which is worthy of vigorous research and application.