Anchor design of pre-stressed carbon fiber reinforced plastic rib group

Abstract

The invention discloses an anchor design of a tensile carbon fiber reinforced plastic (CFRP) rib group. The CFRP rib is wrapped by using a soft metal layer so that the surface of the rib is uniformly stressed, and shearing damage and crushing damage are avoided; the force required for anchoring consists of two parts, wherein one part is the adhesion of the epoxy resin between the CFRP rib and the soft metal layer, while the other part is a horizontal component force produced by squeezing the CFRP rib with a conical plug and due to the angle per se; in order to prevent stress concentration, the force of the second part is limited on the rear half part of the entire soft metal layer; and the entire anchor is fixed to an anchor plate by using the conical plug; the other end of the anchor is connected with a pull rod and can be anchored by using an engineering jack in a tensile way; and the entire CFRP rib can be finally fixed to the two ends of a concrete beam by using the anchor at the previous end for anchoring after the tensile anchoring. The anchor has the characteristics of high operability, high usability and low cost.

Description

technical field [0001] The patented technology relates to the field of civil engineering construction and is applicable to the anchoring of prestressed carbon fiber plastic bars (CFRP). Background technique [0002] Carbon Fiber Reinforced Polymer (CFRP) is a substitute material for steel bars. Today, when steel bars are used more and more widely, some disadvantages of steel bars have also caused more and more troubles to projects. For example, steel bars are prone to corrosion, and after a long period of use, the structure will cause danger due to the decrease in the strength of these corrosions. In addition, although the specific gravity of steel bars is better than that of concrete, its specific gravity has become the main factor restricting human beings from making larger-span buildings today as the span of bridges is getting longer and longer. As a substitute material for steel bars, CFRP has light weight, high strength, no corrosion, acid, alkali, salt and other envi...

AI Technical Summary

Problems solved by technology

[0004] However, the application of CFRP is also subject to many restrictions. Engineering practice shows that when the structure is damaged, the internal force of CFRP is only 30% of the ultimate internal force, which means that its strength cannot be exerted, and the part that restricts its exertion is very large. To a large extent, it is the anchor of CFRP

Although CFRP has high strength in axial tension, its ability to resist shear and compression is very weak, which makes the design of anchorage more difficult.

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