1. reduction of stress and strain lag

For example, carbon fiber fabric for structural strengthening, because the hysteresis of stress and strain can not give full play to its performance. Especially when the original structure working stress strain value is high, compression members and shear members based on concrete bearing capacity in the original structure and after destruction of the part crush one by one. It is not ideal or doesn't work at all.

On the contrary, if the load is removed before the reinforcement of carbon fiber cloth, the situation is completely different. Due to reducing the influence of two times of load and decreasing the lag strain of CFRP, the old and new two parts can enter their respective limit state at the same time, and the overall bearing capacity of the structure can be significantly improved.

2. save the structural reinforcement material

The load is removed before the reinforcement, the CFRP lag should be reduced or even disappeared. The reinforced structure can make full use of the strength of CFRP and do not need to reinforce it repeatedly, which saves reinforcement materials.

3. improve the bearing capacity of the structure

The influence of removed loading on the bearing capacity of reinforced structure is mainly manifested in the reduction of the first load stress and strain level index of the original structure, especially for the reinforced concrete structures strengthened with concrete encircling reinforcement and the flexural structures strengthened with fulcrum.