Retrofitting of column

The main part of a shopping center is a two-story frame structure with a floor area of 11,000 square meters. Because of the long service life, it is necessary to reinforce and rebuild the structure. After checking the bearing capacity of the structure, it is found that there are three aspects to be strengthened.

First, the main reinforcement and the carrying capacity of the hoop in the encrypt area are deficient in the two storey building. Second, the original two floor roof is two grade precast slab, which is not enough to bear the weight of the upper level of the shopping center. Third, because the strength of concrete is lower than the original design value, the axial compression ratio of several columns is too large. According to the reinforcement requirements and the "Technical Specification for Reinforcement of Concrete Structures", it is decided to reinforce the beams and columns with FRP fabric, and to replace the three-level slabs with cast-in-place slabs.

There is no need for cracks in the strengthened structural members after FRP fabric reinforcement, and all kinds of performance indexes of beams and slabs are also within the requirements of the code.

It can be seen that with the continuous maturity of FRP fabric reinforcement technology, its application prospects will continue to expand. Moreover, due to the characteristics of FRP fabric reinforcement, it is likely to replace steel as the most widely used building material.