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Method for reinforcing metal tube joint by means of fiber reinforced polymers (FRPs)

A technology of fiber reinforcement and composite materials, applied in building maintenance, construction, building construction, etc., can solve the problems of late start, lack of research and design, etc., and achieve the effect of improving stiffness, beautiful appearance of joints, and good durability

Active Publication Date: 2015-07-22
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method started late in the field of metal structure reinforcement, especially the related research and design of metal pipe joint reinforcement is very lacking.

Method used

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  • Method for reinforcing metal tube joint by means of fiber reinforced polymers (FRPs)
  • Method for reinforcing metal tube joint by means of fiber reinforced polymers (FRPs)
  • Method for reinforcing metal tube joint by means of fiber reinforced polymers (FRPs)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Reinforcement of circular steel tube K-shaped gap joints with carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, CFRP)

[0066] figure 1 It is a structural schematic diagram of a K-shaped gap node of a circular tube reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a round steel pipe K-shaped gap node, the size of the main pipe is Φ219mm×8mm, the diameter of the branch pipe is Φ133mm×6mm, the angle θ between the main pipe and the branch pipe is 55°, and the gap length g of the node domain is 40mm. The steel used for the nodes is Q235B.

[0067] First, surface treatment is carried out on the joints of steel pipes, and then adhesive is laid for reinforcement; the surface treatment is shot blasting, the purpose is to remove the rust layer, and make the surface rough to facilitate the adhesion of the adhesive layer; for places with more local oil pollution, use acetone to de...

Embodiment 2

[0102] Reinforcement of round aluminum tube K-shaped lap joints with glass fiber reinforced polymer (Glass Fiber Reinforced Polymer, GFRP)

[0103] Figure 23 It is a structural schematic diagram of a K-shaped lap joint of a circular tube reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a K-shaped lap joint of a round aluminum tube. The size of the main pipe is Φ200mm×6mm, the diameter of the branch pipe is Φ167mm×6mm, the angle θ between the main pipe and the branch pipe is 60°, and the lap rate Ov is 40%. Therefore, the lap length q is 77mm (take the gap length g as -77mm). The aluminum used for the nodes is 6061-T6.

[0104] First, surface treatment is carried out on the metal pipe joints, and then adhesive is laid for reinforcement; the surface treatment is shot blasting, the purpose is to remove the rust layer, and make the surface rough to facilitate the adhesion of the adhesive layer...

Embodiment 3

[0128] Reinforcement of round steel tube Y-shaped joints with carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, CFRP)

[0129] Figure 24 It is a structural schematic diagram of a round tube Y-shaped node reinforced with a fiber-reinforced composite material according to an embodiment of the present invention. The reinforcement object is a Y-shaped joint of a round steel pipe, the size of the main pipe is Φ245mm×10mm, the diameter of the branch pipe is Φ180mm×8mm, and the angle θ between the main pipe and the branch pipe is 45°. Since the Y-shaped joint has only one branch pipe, it can be approximately considered as a special case of the K-shaped joint—the two branch pipes overlap each other, so the lap length can be approximately considered as the projected length of the branch pipe diameter on the main pipe axis (take the gap length g =-d / sinθ=-180 / sin45°=-255). The steel used for the nodes is Q235B.

[0130] First, surface treatment is carried out on the ...

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Abstract

The invention discloses a method for reinforcing a metal tube joint by means of fiber reinforced polymers (FRPs). The method includes the following steps that surface treatment is conducted on the metal tube joint first, then adhesives are laid for reinforcement which sequentially involves the three steps of bidirectional FRP cloth reinforcement, unidirectional FRP cloth reinforcement and end anchoring, and finally curing is carried out. The method is easy and convenient to implement, no complex equipment is needed, and the method is suitable for the complicated geometric shape of the tube joint. Meanwhile, the adhering FRPs are light and high in strength, and the joint weight does not need to be additionally increased. After reinforcement is completed, the appearance of the joint is attractive, and the joint has good durability. The method is used for the common metal tube joint, and static performance such as rigidity, ductility and bearing capacity and fatigue performance of the joint are improved by adopting the mode that the FRPs cooperate with the metal tube joint and deformation of the joint is suppressed; the method can also provide references for design thought of other types of tube joints.

Description

technical field [0001] The invention belongs to the technical field of structural engineering in civil engineering, and relates to a method for reinforcing metal pipe joints. Background technique [0002] Metal tube structures have a long history and are widely used. However, with the development of society, the original design of many structures has been difficult to meet the current use requirements, and there have been many cases of damage or even destruction due to structural overload and other reasons. Therefore, the strengthening of the existing metal pipe structure, especially the reinforcement of its key parts—metal pipe joints has important theoretical significance and practical value. Traditional reinforcement methods include steel plate paste, casing reinforcement, rib plate welding, etc. Not only is the construction difficult, it affects the appearance, and the corrosion resistance is poor, but some methods (such as welding rib plates) are likely to cause stress ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02E04B1/58
Inventor 傅宇光童乐为周海明
Owner TONGJI UNIV
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