JPS6223729A - Connection of frp member - Google Patents

Abstract

PURPOSE:To permit to transmit all of the load bearing capacity of FRP member by a method wherein a splice plate, whose configuration is corresponding to the same of FRP member substantially, is bridged between the ends of FRP members and both of the members are calmped through bolts while interposing an adhesive agent between the FRP members and the splice plate. CONSTITUTION:The ends of FRP members are reinforced by employing either one of 0 deg./90 deg. cloth, bias cloth or unidirectional cloth to form a FRP reinforced layer 4 and a predetermined number of bolt holes are bored at predetermined positions so as to penetrate through the reinforcing layers. The splice plate 3 of FRP, similar to the sectional configuration of FRP member 1 to be con nected and having a configuration capable of enclosing the member 1, is rein forced in the same manner as the ends of the members 1. The plate 3 is divided into a plurality of members and are bored with the bolt holes corresponding to the same holes bored on the ends of the member 1. Subsequently, both rein forced ends of both members 1, 1 and connecting surfaces are coated with the adhesive agent 5 to bond them each other while bolts are penetrated through the bolt holes to clamp and integrate them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for joining FRP members that provides a large joint strength.

[Conventional technology]

Figures 6 and 7 show a conventional method of joining FRP members, and in this example, columnar FRP members 1°2 each having an H-shaped cross section are joined. At the ends of both FRP members 1゜2, small holes are drilled at predetermined positions, and these ends are made to face each other, and the same (Fl-LP flat plate splice plate 3... Align the bolt holes drilled in the splice plate 3... with the bolt holes of the FR/P members 1 and 2 between both end faces, and insert the tightening bolts into the F-P.
This is a method of joining the members 1 and 2 and the splice plate 3 by tightening them.

[Problem that the invention seeks to solve]

However, in such conventional joining methods,
The strength of the joint was low, and the joint efficiency was poor (for this reason, when designing the structure, cauldron members had to be used due to the low strength of the joint, which was also uneconomical).

[Means for solving problems]

Therefore, in this invention, the ends of the FRP members to be joined are reinforced using reinforcing fiber cloth, and then a splice plate having a shape similar to that of the LP member is applied to the ends, and the FLP members are joined together. By interposing an adhesive between the sprite plate and tightening the bolts, the joint strength of the joint is increased.

Improved joint efficiency.

In the joining method of this invention, the FRP to be joined without
Roughly layer F'RP on the LP member to reinforce it. J1
Figures 2 and 3 show examples of this end reinforcement. In this example, the FRPLP member is a columnar long body with an H-shaped cross section, and the 1 m joint end thereof is made of reinforced fiber cloth made of glass fibers, carbon RA fibers, etc., and is made of unsaturated polyester resin, epoxy F
An RP reinforcing layer 4 is formed. Figure 1 shows F) LP reinforcement layer 4 using BA/F cloth as reinforcement FAA cloth,
Figure 2 shows an F-P using a one-way cross as the reinforcing fiber cloth.
M-strength layer 4 is shown, and Figure 3 shows 0'/9 in the reinforcing fiber cloth.
F, RP reinforcement layer 4 using 0° cloth is shown.

A predetermined number of bolt holes are drilled through the F-P reinforcing layer 4 at predetermined positions.

On the other hand, as shown in FIG.
A splice plate 3 having a shape similar to the surface shape and wrapping around the 182 member 1 is prepared in advance. This splice plate 3 is F'RPfi and FRPI@! Material 1
It is reinforced using the same method as the edges of the Further, this splice plate 3 is divided into a plurality of members for manufacturing and usage reasons, and when the FRP member 1 is H-shaped, it is composed of six members 3a, 3b, 3c, 3d, 3e, and 3f. ing. Furthermore, splice plate 3 has an FR
Bolt holes corresponding to the bolt holes drilled at the end of the P member 1 are drilled.

Next, as shown in FIG. 4, an adhesive 5t-36 made of unsaturated polyester resin or epoxy resin was applied to the joint surfaces between the reinforced ends of both FRP members 1.1 and the splice plate 3, and Paste these together and use adhesive 5
Insert the tightening bolt into the above bolt hole and tighten it before it hardens.

By tightening the bolts, excess mN agent protrudes from the end of the splice plate 3.

Thus, once the adhesive 5 has solidified, both FRPi
#1.1 is fully joined and integrated by splice plate 3 and adhesive 5.

[For production]

In such a joining method, since the ends of the FRP members 1, 1 to be joined and the splice plate 3 are reinforced, the bearing capacity of the bolts between the FRP members 1, 1 and the splice plate 3 is improved. In addition, since the splice plate 3 is provided so as to wrap around the FRP member 1.1, the bonding area of the adhesive 5 increases, and the bonding strength also increases.
The full strength of the P member 1.1 is now transmitted.

[Other Examples]

FIG. 5 shows another example of the joining method of the present invention.
(b) The same reference numerals are given to the constituent parts as in the previous example, and the explanation thereof will be omitted. In this example, F 几Pf11
11. A columnar member having a T-shaped cross section is used for the splice plate I, and three members 3a having a shape matching the cross-sectional shape of this FRP member 1 are used.

The difference from the previous example is that 3b and 3C are used. Similar effects can be obtained in this example as well.

〔Effect of the invention〕

As explained above, the FRPLP member joining method of the present invention involves reinforcing the ends of the FRP members to be joined using a reinforcing fiber cloth and a curable resin, and then attaching a splice plate having a shape that almost matches the shape of the FRPLP member. Since it spans between FRPi materials, interposes adhesive between the F'RP member and splice plate, and bolts the splice plate and PELP member, the following effects can be obtained. .

(a) FRPLP member - It becomes possible to transmit 1,000 forces, and the joint efficiency increases to nearly 1005J.

(b) Therefore, the advantage of high tensile strength, which is a characteristic of FRP, can be fully realized, and FRP
Since the cross section of the member can be effectively used, the cross section of the FRP member can be reduced, and an economical structural design can be achieved.

(C) Therefore, by choosing glass ffl reinforced unsaturated polyester resin or carbon fiber reinforced epoxy resin as FRP members with high elasticity and high strength, FRP members can be used as steel frames for construction and civil engineering. This makes it possible to obtain a steel frame that has features such as light weight, corrosion resistance, and easy workability that are not found in conventional steel frames.

[Brief explanation of drawings]

Figures 1, 2, and 3 all show examples of end reinforcement of FRP members according to the present invention. Figure 3 is a perspective view showing the case where a 0'/90° cross is used, and Figures 4 and 5 both show the state of connection between the end of the FkLP member and the splice plate in this invention. In Figure 4, the cross-sectional shape of the FRP member is H-shaped, and in Figure 5, the cross-sectional shape of the FRP member is T-shaped.
FIGS. 6 and 7 are schematic cross-sectional views showing an example of the shape, and FIGS. 6 and 7 show the joined state of conventional FRP members, with FIG. 6 being a plan view and FIG. 7 being a front view. 1... Fm2 member, 3... Splice plate, 4... FRP reinforcement layer, 5...
·glue.

Claims (2)

[Claims] (1) Reinforce the ends of the FRP members to be joined using reinforcing fiber cloth and curable resin, and then span the splice plate with a shape that almost matches the shape of the FRP members between the end faces of the FRP members. The splice plate and FR are bonded by interposing adhesive between the splice plate and the splice plate.
A method for joining FRP members, characterized by tightening bolts to a P member. (2) The method for joining FRP members according to claim 1, wherein the reinforcing fiber cloth is any one of a 0°/90° cloth, a bias cloth, a unidirectional cloth, or a combination thereof.