Beam and slab strengthening

FRP composite strengtheningand repairing technology is a new type of structural strengthening technology. It uses resin bonding adhesive to paste carbon fiber fabric on the surface of concrete to achieve the purpose of strengthening the structure and components.

Reasons for insufficient bearing capacity of beams and slabs and purposes of structural reinforcement

(1) The bearing capacity of bending members such as beams and slabs is insufficient because the concrete strength can not meet the design requirements during the construction process or because of the insufficient reinforcement and mismatch.

(2) The main reason for the insufficiency of the bearing capacity of bending members such as beams and slabs in design is that the calculation sketch does not accord with the actual stress of beams and slabs, or the load is omitted or undercalculated.

(3) serious overload during use will also cause insufficient bearing capacity of beam and slab.

(4) Other reasons: uneven settlement of the foundation causes additional stress in the beam; immature components are used; and the influence of component forms.

Purpose of structural reinforcement

(1) improve the strength of structure and component;

(2) improve the stability of structure and component.

(3) improve the stiffness of structure and component.

(4) improve the durability of structures and components.

Mechanical behavior of reinforced concrete structures

The mechanical behavior of the reinforced structure is different from that of the ordinary structure without reinforcement. Firstly, the reinforced structure belongs to the secondary structure. Before reinforcement, the original structure has been subjected to the load (i.e. the first load), and the original structure has some compression (or bending) deformation. At the same time, the original structure concrete has basically completed the shrinkage deformation. The reinforcement is usually carried out without unloading. When the new part is loaded, that is, under the second loading, the stress and strain of the new part are lagged behind the stress and strain of the original structure. Therefore, the new structure and the old structure can not reach the peak stress at the same time, when the damage, the new part may not reach its limit state. Secondly, the new and old parts of the reinforced structure have the problem of integral work, and the key of the integral work is whether the shear force can be effectively transferred from the joint surface. Because of the above-mentioned mechanical characteristics of the reinforced structure, its calculation method, structural treatment and construction requirements are different from ordinary concrete structure.

Strengthened with carbon fiber fabric

(1) It is suitable for the reinforcement and repair of various structural types and parts, such as beams, slabs, columns, roof trusses, piers, bridges, cylinders, shells and other structures.

(2) the strength grade of base concrete is no less than C15.

Summary

Carbon fiber fabric reinforcement technology is ideal for strengthening and reinforcing concrete structures and components. On the premise of not increasing the cross-section size and dead weight of the beam, the construction period, material durability, construction quality and other aspects of the technology meet the requirements of the owner. Its comprehensive economic and social benefits are good, and has great popularization and application value.