Steel structure is a structure mainly made of steel, with good toughness, high strength, light weight, and excellent seismic performance and load-bearing capacity. Steel structure occupies an important position in my country's economy, whether it is in industrial and civil buildings, structures, or engineering structures such as bridges and tunnels, there are a large number of steel structures.

The steel structure has a wide range of applications and the environment is also complex and changeable. Some structures have been in a corrosive environment for a long time, some have been subjected to periodic loads for a long time, and some have been in service for a long time at high temperature and high pressure. The complex and changeable environment will cause the performance of the steel structure to deteriorate, and long-term accumulation will lead to failure. For the sake of safety and economic efficiency, it is necessary to repair and strengthen the steel structure.

The commonly used methods of steel structure repair and reinforcement include steel plate welding, screwing, and riveting to the damaged part of the structure. These methods can indeed improve the stress of the defective part to a certain extent but cannot greatly improve the load-bearing capacity of the steel structure. This also makes us have to explore new reinforcement methods. Carbon fiber reinforcement will be considered as a hot reinforcement technology. In fact, our country has been researching in this area and has achieved certain results.

In 2016, the industry standard YB/T 4558-2016 "Technical Regulations for Reinforcement and Repair of Steel Structures with Fiber Reinforced Composite Materials" was published, the industry standard for carbon fiber reinforced steel structures. This also provides a strong basis for our carbon fiber reinforced steel structure. And the carbon fiber reinforced rigid structure has been applied in many steel structural members. The earliest actual cases of carbon fiber reinforced steel structures have been 15 years old and have achieved good results.

Carbon fiber reinforcement has been widely used in the field of reinforced concrete due to its advantages of light weight, high strength, convenient construction, good durability, and wide application range. However, it is not so widely used in the field of steel structure reinforcement. With the gradual development of carbon fiber reinforcement, people know more about it and its application will become more and more extensive.