Device and method for reinforcing concrete shear wall by FRP (fiber reinforced plastics)

Abstract

The invention relates to the technical field of civil engineering structure reinforcement, in particular to a device and a method for reinforcing a concrete shear wall by FRP (fiber reinforced plastics). The device comprises the concrete shear wall, epoxy resin layers, a first FRP strip belt and second FRP strip belts, wherein the epoxy resin layers coat two wall surfaces of the concrete shear wall; the first FRP strip belt is fully and transversely bonded on the surface of the oxygen resin layer of the lower part of the concrete shear wall; a plurality of second FRP strip belts are uniformly and transversely bonded at equal intervals at the upper part of the first FRP strip belt; a plurality of through holes are uniformly formed in the lower part of the concrete shear wall; the device for reinforcing the concrete shear wall by FRP also comprises steel plates, a screw rod and a screw nut; installing holes are formed in the steel plate; the steel plates cover the two ends of the through holes, and the installing holes and the through holes are opposite; the screw rod simultaneously passes through the concrete shear wall, the epoxy resin layers, the first FRP strip belt and the steel plate; screw nuts are arranged at the two ends of the steel plate. The quake-proof capability of the concrete shear wall can be improved; the FRP peeling damage can be prevented.

Description

technical field [0001] The invention relates to the technical field of civil engineering structure reinforcement, in particular to a device and method for reinforcing a concrete shear wall by using FRP. Background technique [0002] In the field of civil engineering, shear walls, also known as anti-seismic walls, are the most important anti-lateral force members in high-rise building structures, mainly used to bear horizontal loads caused by wind loads or earthquakes. When the existing shear wall structure has insufficient bearing capacity due to design, construction defects, or even disasters, which affects the safety and normal use of the building structure, it needs to be repaired and reinforced. In order to solve the problem of insufficient bearing capacity of the shear wall, the existing reinforcement methods mainly include pasting FRP cloth at equal intervals in the transverse direction or covering the surface of the shear wall, which can improve the shear bearing capa...

AI Technical Summary

Problems solved by technology

However, under the action of axial pressure and horizontal force on the reinforced shear wall, the bottom section of the shear wall is more likely to be damaged due to the larger internal force.

According to the first reinforcement method, the FRP is pasted on the surface of the shear wall at equal intervals in the transverse direction, and the FRP concrete strip is not pasted on the bottom of the shear wall. Since there is no FRP constraint, it is easy to form a weak section, which will affect the reinforcement effect; according to another reinforcement method method, paste FRP all over the surface of the shear wall for reinforcement, this reinforcement method is easy to cause excessive reinforcement and waste materials for the upper part of the shear wall with small internal force

[0003] On the other hand, FRP-strengthened shear walls are prone to FRP peeling damage under load. FRP peeling not only reduces the tensile strength utilization of FRP materials, but also causes brittle failure of components, affecting structural safety.

[0004] In order to solve the problem of FRP peeling damage, the Chinese patent with the patent publication number of CN103866991A discloses a method for preventing the peeling of basalt fiber cloth and concrete when repairing the shear wall. The main solution in this method is to pass the basalt fiber strip through the shear wall. The through hole of the force wall, the two ends of which are stuck on the surface of the basalt fiber cloth in the shape of petals. By applying tension to one end of the basalt fiber strip, the positive pressure of the sticking between the concrete surface and the basalt fiber cloth and the horizontal force to prevent peeling and damage are provided. However, the bonding positive pressure provided by this method is small, and the construction process of this method is cumbersome, and the anchoring effect is greatly affected by the construction quality.

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