Recently, earthquake disasters have occurred at different levels in the world. Frequent earthquake disasters have brought huge harm to people and serious property losses.

Structural retrofit existing concrete structures are affected by various factors such as the natural environment and use environment, showing varying degrees of insufficient bearing capacity, excessive degeneration and other defects. Researchers at home and abroad have proposed different maintenance and retrofit for the damage of the engineering structure method. Bridge retrofit takes certain measures to improve the load-bearing capacity and use performance of the components and the entire structure to meet new requirements. In other words, it is necessary to deal with the situation that the bridge cannot satisfy the continued use.

The advantages of this method of retrofit and reconstruction are similar to those of the enlarged section method, and the clearance of the building will not be affected after retrofit, but it also has the disadvantage of long wet working time. It is suitable for retrofit of concrete load-bearing components such as beams and columns with low concrete strength or serious defects in the compression zone. Strengthening the building structure against earthquakes is a top priority.

Therefore, it is recommended to adopt the most suitable seismic retrofit method--------unidirectional carbon fiber cloth.

The seismic retrofit technology of carbon fiber cloth is to match the carbon fiber cloth with the bonding adhesive. It is a advanced composite strengthening method for seismic retrofitting.

Carbon fiber cloth is woven with imported carbon yarn. It has excellent seismic performance, high strength, corrosion resistance, light weight, unchanged structural shape, and no increase in structural weight. It can be widely used in various structure types, shapes and parts. Especially suitable for seismic retrofit of structures.

The seismic retrofit of carbon fiber cloth has the following advantages:

(1) Excellent mechanical properties can be effectively applied to various forms of structural retrofit, including bending, shear, compression, fatigue, earthquake resistance, wind resistance, control of cracks and deflection expansion, and improvement of structural toughness.

(2) Excellent chemical stability, so that the post-repair and retrofit structure has strong acid, strong alkali, salt, and water erosion ultraviolet ability; sufficient ability to adapt to temperature changes.

(3) The material is light and strong, the volume of the structure cannot be increased, and the additional weight of the structure can be ignored. This is not the traditional way.

(4) The construction process is simple, can be operated with small electric tools, and the construction space is small. The construction progress is fast, the construction period is short, and it can be operated under continuous traffic vibration conditions. As a result, the time of work stoppage, work stoppage, and traffic opening is greatly shortened, and economic losses and social impact are greatly reduced.

(5) Because the material is soft, it is easy to stick with the structure shape. The shape of the structure remains unchanged after retrofit. At the same time, it is convenient to paint with the required color, without showing signs of retrofit.