KR20140124262A - Steel Girder reinforced using Fiber Reinforced Polymer - Google Patents

Steel Girder reinforced using Fiber Reinforced Polymer Download PDF

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Publication number
KR20140124262A
KR20140124262A KR20130041779A KR20130041779A KR20140124262A KR 20140124262 A KR20140124262 A KR 20140124262A KR 20130041779 A KR20130041779 A KR 20130041779A KR 20130041779 A KR20130041779 A KR 20130041779A KR 20140124262 A KR20140124262 A KR 20140124262A
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KR
South Korea
Prior art keywords
fiber reinforced
reinforcing member
reinforced plastic
steel
steel girder
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Application number
KR20130041779A
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Korean (ko)
Inventor
이원식
노광근
박노준
최성모
Original Assignee
(주)티섹구조엔지니어링기술사사무소
서울시립대학교 산학협력단
한국동서발전(주)
(주)희상리인포스
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Application filed by (주)티섹구조엔지니어링기술사사무소, 서울시립대학교 산학협력단, 한국동서발전(주), (주)희상리인포스 filed Critical (주)티섹구조엔지니어링기술사사무소
Priority to KR20130041779A priority Critical patent/KR20140124262A/en
Publication of KR20140124262A publication Critical patent/KR20140124262A/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/30—Metal
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/40—Plastics

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The present invention relates to a steel girder comprising a fiber reinforced plastic stiffening member with an antislip structure for an end unit, wherein the fiber reinforced plastic stiffening member is coupled to the lower surface of the steel girder in the case of changes in building conditions and the breakage of members caused by collision and corrosion in the existing steel girder. In accordance with an embodiment of the present invention, the steel girder comprises a steel girder; a stiffening member which is made of fiber reinforced plastics and has an attachment surface of which the outer end unit is diagonally cut in order for the upper cross section to be narrower than the lower cross section and a connection support hole formed by passing through both ends thereof; and an adhesive bonding the lower surface of the steel girder to the stiffening member by filling in between adhesive surfaces of the steel girder and the stiffening member and in both an adhesive layer of the steel girder, the stiffening member and the connection support hole.

Description

[0001] The present invention relates to a fiber reinforced plastic reinforcing material having an end slip preventing structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an FFP steel frame having an end slip prevention structure, and more particularly, to an FFP steel frame having an end slip prevention structure, Reinforced plastic reinforcement having an end slip prevention structure to which a reinforced plastic reinforcement is joined.

The main reinforcement methods of bridges currently used in Korea include post-tensioning method using external steel rods, cross-section attachment method in which steel plate or carbon fiber is directly attached to the lower part of the girder, and pier extension method. The reinforcement method of bridges using external steel rods has been widely applied to PSC bridges, steel bridge, and so on, which can be expected to improve the stress generated in the girder due to deflection and load by introduction of prestressing by steel rods. However, the post-tensioning method using external steel rods increases the stiffness of the bridges to the ultimate limit and yielding, which is excellent in the bending reinforcement effect. However, it has disadvantages such as stress concentration at the joint portion of the base material, inefficient distribution of load, installation of fixed anchor portion, Lt; / RTI >

In addition, the cross-section attachment method improves the cross-sectional characteristics of the bridge by attaching a reinforcement to the lower part of the girder. Methods using carbon fiber or steel plate have been studied. However, in case of using steel as a reinforcing material, it is necessary to use a steel plate having a heavy weight, and not only the workability is remarkably decreased, but also welding and bolt joining are used. Damage and electric shock caused by electricity use are a concern. When carbon fiber is used as a reinforcing material, tensile and flexural strength increase due to the complete synthesis of the attached material and girder, but adhesion strength is decreased due to bending stress after bending due to adhesion strength at the interface between the end of the attached member and the adhesive .

As a technology to be a background of the present invention, there is a patent registration No. 0271227 entitled " Strengthening Method of Structures by Stepwise Attachment of Stiffeners "(Patent Document 1). 7, in the reinforcing method of reinforcing the structure by attaching a reinforcing material to the structure, a reinforcing material made of a fiber material and having a short length from the central portion to the end portion of the reinforcing material in the order of attaching the reinforcing material to the structure Reinforced method including a step of attaching in a laminated manner "

However, the background art also has a problem in that adhesion failure occurs at the interface between the adhesive and the structure starting from the end of the reinforcement.

Patent Registration No. 0271227 "Reinforcement of Structures by Staged Attachment of Stiffeners"

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a steel plate, in which a reinforcing member formed of a steel plate is joined to a lower surface of a steel beam, It is possible to increase the load bearing capacity of the structure and relatively increase the adhesion force of the end portion of the structure so as to prevent the end portion from slipping and to prevent the end portion from leading to the breakage of the end portion. The object of the present invention is to provide a steel frame having a reinforcing material.

The present invention relates to a steel structure comprising: a steel frame; A reinforcing member formed of fiber reinforced plastics and formed with an adhesive surface whose outer end is cut in an oblique line so that an upper end face is narrower than a lower end face and a coupling support hole formed through both end sides; Wherein the reinforcing member is made of a fiber reinforced plastic reinforcing material having an end slip prevention structure, wherein the reinforcing material is filled between the bonding surface of the steel frame and the reinforcing member, the bonding surface between the steel frame and the reinforcing member, To provide a constructed steel frame.

Also, it is an object of the present invention to provide a steel frame made of a fiber-reinforced plastic reinforcing material having an end slip prevention structure, wherein both ends of the reinforcing material are formed in a shape in which the edges are cut obliquely.

Also, it is an object of the present invention to provide a steel frame comprising a fiber reinforced plastic reinforcing member having an end slip prevention structure, wherein the coupling support hole is formed in a peanut shape in which two circular parts are partially overlapped.

Also, it is desirable to provide a steel frame comprising a fiber reinforced plastic reinforcing material having an end slip prevention structure, wherein both ends of the reinforcing material are formed in a shape where the edges are cut into curved lines.

The steel reinforced plastic reinforcing member having the end slip prevention structure is characterized in that two reinforcing members are coupled to the lower portion of the steel frame in the longitudinal direction and another reinforcing member is padded to the lower portion of the portion where the reinforcing member is continuous. .

The steel wire frame comprising the fiber reinforced plastic reinforcement having the end slip prevention structure according to the present invention comprises a reinforcing material formed by forming an FPC on a lower surface of a steel frame and having an adhesive surface where the upper edge is cut obliquely, It is possible to increase the load-bearing capacity of the structure and relatively increase the adhering force of the end portion, thereby preventing the end portion from slipping and preventing the end portion from being damaged beforehand .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is an exploded perspective view of a steel frame constructed of a fiber reinforced plastic reinforcement having an end slip prevention structure according to the present invention.
2 is a sectional view of the coupled state of FIG.
3 is a bottom view of the coupled state of FIG. 1;
FIG. 4 is a perspective view illustrating various embodiments of a coupling support hole of a stiffener according to the present invention. FIG.
Fig. 5 is a bottom view showing an embodiment of the shape of an end portion of a reinforcing member in a steel frame of the present invention. Fig.
6 is a side sectional view showing another embodiment of a steel frame constructed of a fiber reinforced plastic reinforcement having an end slip prevention structure according to the present invention, and Fig. 6B is a bottom view.
7 is a perspective view of a concrete structure reinforced by a reinforcing method according to a conventional example.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

 Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

1 is an exploded perspective view of a steel frame constructed of a fiber reinforced plastic reinforcement having an end slip prevention structure according to the present invention.

As shown in Fig. 1, a steel beam 1 composed of a fiber reinforced plastic reinforcement having an end slip prevention structure according to the present invention comprises a reinforcing member 100 formed of fiber reinforced plastics on the lower surface of a general steel bar 10 ) Are bonded to each other using an adhesive (20).

Steel structures built before the revised seismic design criteria must be reinforced with seismic performance to meet the new standards. As part of that, primary, middle and high schools are undergoing earthquake-resistant maintenance and reinforcement. In addition, a bill has been prepared to ensure the earthquake-proof stability of the power supply facilities, which are the main infrastructure of the country, and steel beams should be used.

FIG. 2 is a sectional view of the coupled state of FIG. 1, and FIG. 3 is a bottom view of the coupled state of FIG. 1.

2 and 3, the stiffener 100 is coupled to the lower surface of the steel beam 10 in a plate shape having a predetermined thickness.

The end portion of the reinforcing member 100 is formed in a shape obliquely cut from the upper portion to the lower portion so that the upper end face of the reinforcing member 100 is narrower than the lower end face to form the bonding face 110.

When the reinforcing member 100 is attached to the lower surface of the steel beam 10, the adhesive surface 110 formed by the slanting line faces the lower surface of the steel beam 10 and the adhesive surface 110 And the lower surface of the steel beam 10 and the space 20 is filled with the adhesive 20 to further secure the connection between the reinforcing member 100 and the steel beam 10. The adhesion area between the reinforcing member 100 and the steel beam 10 can be maximized to prevent adhesion failure at the interface between the adhesive 20 and the steel beam 10 starting from the end of the reinforcing member 100. [

At both ends of the stiffener 100, an engaging support hole 120 is formed.

The coupling support holes 120 are symmetrically formed on both end portions and may be formed by one or more holes. When the reinforcing member 100 is adhered to the lower surface of the steel bar 10 using the adhesive 20, the adhesive 120 is adhered to the joining support hole 120 of the reinforcing member 100, The adhesive agent 20 at both ends of the stiffener 100 attached by the bending stress or the like after being reinforced with the stiffener 100 increases the tensile and flexural strengths due to the complete engagement of the stiffener 100 and the steel beam 10, So that the adhesion strength is not reduced at the interface between the substrate and the substrate.

FIG. 4 is a perspective view illustrating various embodiments of a coupling support hole of a stiffener according to the present invention. FIG.

As shown in FIG. 4 (b), the coupling support holes 120 may be formed in a circular shape, as shown in FIG. 4 (a) The longest side of the coupling support hole 120 is aligned with the longitudinal direction of the stiffener 100 so that the two-stage support can be achieved.

Since the reinforcing member 100 is coupled to the lower surface of the steel beam 10, the reinforcing member 100 may be formed in various sizes and shapes, and may be generally formed in the same plate shape as the lower surface of the steel beam 10.

Fig. 5 is a bottom view showing an embodiment of the shape of an end portion of a reinforcing member in a steel frame of the present invention. Fig.

When the reinforcing member 100 is formed into a plate shape, the corner portion of the reinforcing member 100 firstly breaks down at the interface between the adhesive 20 and the steel beam 10, As shown in FIG. 5A, both end portions of the stiffener 100 may be formed in a shape of being cut obliquely. In order to expand the stiffener 100 as much as possible, as shown in FIG. 5B, . When the edge is cut into a curve, the end portion may form a semicircular shape.

Fiber reinforced plastic (FRP) is used as the material of the stiffener 100. The fiber reinforced plastic (CFRP), as well as aramid fiber reinforced plastic (AFRP), boron fiber, Kevlar fiber Can be used.

As described above, although there are various types of FRP materials, CFRP has been used mainly for repairing and reinforcing concrete structures. It has the advantages of tensile strength properties of about 6 to 7 times of steel, shortening of time and space, and shortening of air. AFRP (Aramid Fiber Reinforced Polymer), which has corrosion resistance and nonconductivity, can be used to repair and reinforce steel structures.

6 is a side sectional view showing another embodiment of a steel frame constructed of a fiber reinforced plastic reinforcement having an end slip prevention structure according to the present invention, and Fig. 6B is a bottom view.

6, two stiffeners 100 are coupled to the lower portion of the steel bar 10 in the longitudinal direction, and a reinforcing member 100a is attached to the lower portion of the continuous portion of the stiffener 100 To be combined.

A single reinforcing member 100 may be coupled to the lower portion of the steel beam 10 to reinforce the steel beam 10. However, if the length of the steel beam 10 is increased, The two stiffeners 100 may be divided and joined so as to have a segmented shape at the lower center of the steel beam since the steel plates can cause not only the adhesion failure at the ends but also the adhesion failure at the center ends.

At this time, a separate reinforcing material 100a may be attached to the lower portion of the connecting portion of the two reinforcing members 100 (100) formed at the lower portion of the steel beam 10, that is, the lower portion of the central portion of the steel beam 10.

The stiffeners 100 and 100 which are continuously formed are spaced apart from each other by a predetermined distance so that the adhesive 20 is sufficiently impregnated to increase the strength of the adjacent ends of the stiffeners 100 and 100, The reinforcing member 100a can be further strengthened.

The stiffener 100a formed at the lower portion of the stiffener 100 may be formed only in the central portion where the maximum tensile force of the steel beam 10 is applied in the same shape as the stiffener 100, However, the lower portion of the portion to which the stiffener 100 is connected is positioned at the center of the stiffener 100a.

 With this structure, it is possible to increase the amount of reinforcement at the central portion of the steel beam 10 to which the maximum tensile force is applied, thereby reducing the material cost.

The steel frame structure of the fiber reinforced plastic stiffener having the end slip prevention structure according to the present invention as described above has a structure in which a reinforcing member formed in an F-shape is joined to a lower surface of a steel frame, Thereby increasing the load-bearing capacity of the structure and increasing the adhering force of the end portion. Thus, it is possible to prevent the end portion from slipping and prevent the end portion from being damaged beforehand There is a very useful effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

1: steel frame made of fiber reinforced plastic reinforcement
10: steel bars
20: Adhesive
100: Stiffener
110: adhesive side
120:

Claims (5)

A steel frame 10;
And an adhesive surface 110 having an outer end cut in an oblique line so that an upper end surface thereof is narrower than a lower end surface is formed, and a coupling support hole 120 is formed through both ends, A stiffener 100 formed;
The reinforcing member 100 and the joining support hole 120 are filled both between the joining face of the steel frame 10 and the stiffener 100 and between the joining face 110 of the steel frame 10 and the stiffener 100 and the joining support hole 120, And an adhesive (20) for bonding the fiber reinforced plastic reinforcement (20) to the fiber reinforced plastic reinforcement (20). The method according to claim 1,
Wherein the reinforcing member (100) is formed in a shape in which both ends of the reinforcing member (100) are cut in a diagonal line. The method according to claim 1,
Wherein the reinforcing member (100) is formed in a shape in which both ends of the reinforcing member (100) are cut in a curved shape. The method according to any one of claims 1 to 3,
Wherein the coupling support hole (120) is formed in a peanut shape in which a pair of circular holes are partially overlapped to each other, and the fiber reinforced plastic reinforcement has an end slip prevention structure. The method according to any one of claims 1 to 3,
Characterized in that two of the reinforcing members (100) are longitudinally coupled to the lower part of the steel bar (10) and another reinforcing member (100a) is attached to the lower part of the continuous portion of the reinforcing member Wherein the fiber reinforced plastic reinforcement is formed of a fiber reinforced plastic reinforcing material.
KR20130041779A 2013-04-16 2013-04-16 Steel Girder reinforced using Fiber Reinforced Polymer KR20140124262A (en)

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KR20130041779A KR20140124262A (en) 2013-04-16 2013-04-16 Steel Girder reinforced using Fiber Reinforced Polymer

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KR20130041779A KR20140124262A (en) 2013-04-16 2013-04-16 Steel Girder reinforced using Fiber Reinforced Polymer

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101986611B1 (en) * 2018-04-24 2019-06-07 정윤성 Integrated structure of reinforced concrete column and steel beam
KR102484233B1 (en) * 2022-06-03 2023-01-04 대영스틸산업주식회사 Reinforcement System of Steel Pipe Girder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101986611B1 (en) * 2018-04-24 2019-06-07 정윤성 Integrated structure of reinforced concrete column and steel beam
KR102484233B1 (en) * 2022-06-03 2023-01-04 대영스틸산업주식회사 Reinforcement System of Steel Pipe Girder

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