FRP (Fiber Reinforce Plastic) profile connecting node and method

Abstract

The invention discloses an FRP (Fiber Reinforce Plastic) profile connecting node and method. Two FRP profiles are available; lapping segments of the two FRP profiles are both provided with binding grooves; the lapping segments of the two FRP profiles are arranged in alternate lapping manner; an epoxy resin impregnating adhesive layer is arranged between the lapping segments of the two FRP profiles; the binding grooves of the two FRP profiles are corresponding to each other; and untwisted fibers are wound at both sides of the binding grooves. According to the FRP profile connecting node and method, the untwisted fibers are introduced to an adhesive layer shear resisting interface, and thus the shearing strength of the adhesive interface is greatly improved, and the connecting node is under stress through adhesive bonding and fiber binding together; and the bonded untwisted fibers greatly restrict the development of the positive adhesive layer cleavage stress, prevents the adhesive layer from being damaged due to the overlarge positive cleavage stress in case the shearing stress is relatively low. The FRP profile connecting node has the advantages of high strength, good ductility, high join efficiency, and the like. Materials used for the FRP profile connecting node are similar to base composition materials of the FRP profiles, and the connection is tight; and the connecting node has the advantages of corrosion resistance, fatigue resistance, good air stability and the like.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and transportation, and relates to an FRP profile connection node and a method. Background technique [0002] FRP profiles for civil construction and transportation are made of epoxy resin as the matrix, untwisted fiber as the reinforcing material, and special additives are added at the same time. The profiles of different specifications are made by the pultrusion process. They have high specific strength and specific stiffness. Corrosion, good fatigue resistance and designability. [0003] In the field of civil engineering and transportation, the application of FRP profiles started relatively late. At present, the connection of FRP profiles in this field basically follows the joint connection methods of composite materials in the aerospace field: cemented connection, mechanical connection and a hybrid connection of the two. The profiles used in the aviation field are layered profiles,...

AI Technical Summary

Problems solved by technology

However, the profiles used in the field of civil engineering and transportation are mainly pultruded profiles, and the fiber direction of the pultruded profiles is mainly along the length direction of the profile. The joint efficiency of this type of profile bolt connection is lower than 30%, and the profile is often sheared off after the profile is squeezed by the bolt. destroy

On the other hand, due to the thicker FRP profiles in the field of civil engineering and transportation, if the cemented connection method is used, in order to ensure sufficient joint efficiency, the required lap length is relatively large, and in more cases it cannot be realized due to structural problems. lap length

Since the common stress of the two connection methods cannot be realized, the joint efficiency of cemented and mechanical hybrid connection nodes cannot be effectively improved

[0004] To sum up, the current joint connection of FRP profiles in the field of civil engineering and transportation has the disadvantages of low joint efficiency and unguaranteed quality, which is far from meeting the needs of the project. This has also become a bottleneck for the application of FRP profiles in the field of civil engineering and transportation.

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