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Method for reinforcing reinforced concrete column by anchoring bidirectional fiber cloth through flexible rivets

A reinforced concrete column and fiber cloth technology, applied in the direction of columns, pier columns, pillars, etc., can solve the problems of loss of reinforcement, stress concentration, peeling damage, etc., and achieve the effect of reducing construction difficulty and cost, and good anchoring effect

Inactive Publication Date: 2021-11-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that the two-way fiber cloth and the traditional anchoring member are prone to peeling and damage due to stress concentration, resulting in loss of reinforcement, the present invention provides a method for flexural and shear strengthening of reinforced concrete columns using two-way fiber cloth and flexible rivets

Method used

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  • Method for reinforcing reinforced concrete column by anchoring bidirectional fiber cloth through flexible rivets
  • Method for reinforcing reinforced concrete column by anchoring bidirectional fiber cloth through flexible rivets
  • Method for reinforcing reinforced concrete column by anchoring bidirectional fiber cloth through flexible rivets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] like Figure 1-3 As shown, the two-way fiber cloth 10 pasted on the surface of a square reinforced concrete column 20 is anchored, and each side of the reinforced concrete column 20 is designed to use two flexible rivets 30 .

[0059] The method of using flexible rivets 30 to anchor the two-way fiber cloth 10 to reinforce the reinforced concrete column 20 has the following steps:

[0060] S1. Wrap the bidirectional fiber cloth 10 behind the reinforced concrete column 20 to be reinforced, and use epoxy resin to cure the bidirectional fiber cloth 10 . The two-way fiber cloth 10 is composed of warp threads and weft threads cross-woven. After pasting, it is necessary to ensure that any one of the warp threads or weft threads is pasted parallel to the axis of the reinforced concrete column 20. The present invention is called longitudinal fibers; The cross-section of the concrete column 20, the invention is called transverse fiber;

[0061] S2. Drill a hole 211 at a corresp...

Embodiment 2

[0069] The structure of the flexible rivet 30 is as Figure 4 As shown, it includes a main rod 31 and a fan-shaped adhesive surface 32 integrally connected with the main rod 31,

[0070] Wherein the main rod 31 is formed by bonding the fiber tow after weaving, and the fan-shaped pasting surface 32 is formed by fanning out from the end of the main rod 31 to the direction away from the main rod 31 by the same group of fiber tows forming the main rod 31. The starting end and the end are respectively provided with fixing pieces 33, and the fixing pieces 33 are hoops for preventing the main rod 31 from loosening.

[0071] In practical applications, the main rod 31 of the flexible rivet 30 can also be made by rolling or weaving fiber cloth.

[0072] The method of using fiber cloth to make flexible rivets 30 is:

[0073] S1. Cropping. Cut the fiber cloth according to the required size. In order to avoid inaccurate size caused by manual errors during production, extend the cutting ...

Embodiment 3

[0103] In the experiment of Example 3, three reinforced concrete rectangular columns were designed and manufactured. The size of the columns is 300mm×300mm×1300mm, the size of the foundation is 300mm×500mm×1700mm, and the strength of the concrete used is C30. The strength grade of the longitudinal reinforcement used in the column is HRB400, and the stirrup is HRB335; the diameter of the longitudinal reinforcement is 28mm, and the diameter of the stirrup is 6mm.

[0104] The reinforcement material used in this test is basalt fiber cloth (BFRP), with an elastic modulus of 87.0GPa, a tensile strength of 1740.0MPa, a thickness of 0.12mm, and an elongation of 2.0 / %.

[0105] The three reinforced concrete rectangular columns are designed as follows: one is an unreinforced comparison column BQ0, one is a constrained column SBQ1 using two-way fiber cloth, and one is a constrained column SBQ1M using two-way fiber cloth and anchored with rivets.

[0106] Fiber cloth is pasted on column ...

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Abstract

The invention belongs to the field of constructional engineering, and particularly relates to a method for reinforcing a reinforced concrete column by anchoring bidirectional fiber cloth through flexible rivets. According to the method, bidirectional fiber cloth is used for winding a to-be-reinforced reinforced concrete column body, epoxy resin is used for curing the bidirectional fiber cloth, flexible rivets are pasted on the surface of the bidirectional fiber cloth or among the multiple layers of bidirectional fiber cloth in the axial direction of the reinforced concrete column, and the flexible rivet is composed of a main rod and a fan-shaped pasting face integrally connected with the main rod. According to the method, the main rod is implanted into the beam connected with the column body, the flexible rivet is pasted on the fiber cloth through the fan-shaped pasting face, and the anchoring effect is good; and the flexible rivets can reduce the construction difficulty and cost, do not damage the fiber cloth and the column body, can effectively avoid the conditions of stress concentration at the anchoring position and stripping damage of the fiber cloth, and ensure the restraining capacity of the bidirectional fiber cloth to the maximum extent.

Description

technical field [0001] The invention belongs to the field of construction engineering, and in particular relates to a method for reinforcing reinforced concrete columns by using flexible rivets to anchor two-way fiber cloth. Background technique [0002] The existing reinforced concrete structures generally have the problems of low column concrete strength and small volume hoop ratio, which cannot meet the design requirements of the current seismic code, and need to be reinforced to ensure structural safety. Outsourcing steel and enlarged concrete section method are traditional reinforced concrete column reinforcement methods, and there are certain problems in engineering use, such as: the outsourcing steel reinforcement method is complex and cumbersome, and the construction quality is not easy to guarantee; the enlarged section method takes a long time for on-site concrete curing Long, the increase in the section of the member will affect the appearance and clearance of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02E04C3/34
CPCE04G23/0218E04C3/34
Inventor 高鹏袁大明王田宇
Owner HEFEI UNIV OF TECH
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