JP7240286B2 - FRP structural member with connecting member - Google Patents

Description

TECHNICAL FIELD The present invention relates to an FRP structural member with a connecting member in which a connecting member is attached to an FRP structural member made of fiber-reinforced plastic.

Conventionally, it has been proposed to use fiber-reinforced plastics as structural members of buildings (see Patent Documents 1 to 3).
Patent Literature 1 discloses a joint structure between a fiber-reinforced plastic member and a concrete member provided on the fiber-reinforced plastic member. The fiber-reinforced plastic member is provided with a fiber-reinforced plastic joint that is integrated with the fiber-reinforced plastic member and embedded in the concrete member.

Patent Literature 2 shows a truss structure roof configured by connecting rod-shaped structural members to a hub. The structural member includes a cylindrical structural cylinder made of fiber-reinforced plastic, and connecting joints provided on both end surfaces of the structural cylinder.
Patent Document 3 discloses a laminated structural lumber comprising an outermost outer layer, a reinforcing layer adjacent to the outer layer, and an inner adjacent layer sandwiching the reinforcing layer between the outer layer and the outer layer. The reinforcing layer includes a plurality of parallel-arranged angular members and a reinforcing fiber sheet.

JP-A-9-317084 JP-A-2000-34802 JP 2010-221514 A

SUMMARY OF THE INVENTION An object of the present invention is to provide an FRP structural member with a connecting member that can join another member to an FRP structural member made of fiber-reinforced plastic without causing a loss of cross section.

The present inventors have developed a fiber-reinforced plastic (FRP) structural member as a structural member such as a column member or a beam member of a building. invented. Specifically, the present inventors provided a through hole in the FRP structural member by adhering a connecting member having a substantially U-shaped cross section or a semicircular cross section to the outer periphery of the FRP structural member. The inventors have focused on the point that the connecting member can be attached to the FRP structural member without causing cross-sectional defects in the FRP structural member as in the case of welding to the FRP structural member, and have arrived at the present invention.
The FRP structural member with a connecting member of the first invention (for example, the FRP structural member with a connecting member 10 described later) is a fiber-reinforced plastic FRP structural member (for example, a girder described later) used for the beam-column structure of a building. 11, 11G) are attached to metal connecting members (for example, connecting members 12, 12A to 12H described later) for joining with other members (for example, small beams 2 described later). Characterized by

In the FRP structural member with a connecting member according to the second invention, the connecting member includes an FRP joint portion (for example, FRP joint portions 20, 20F, and 20G to be described later) joined to the FRP structural member, and the other member and other member joints (for example, other member joints 30, 30A to 30E, 30G, 30H described later), and the FRP joints are at least one of the outer circumferences of the FRP structural members. has a joint surface (for example, 21, 21F, and 21G described later) inscribed in the portion, and the other member joint portion includes a through hole for joining with the other member (for example, a through hole 35 described later) and/or It is characterized in that locking portions (for example, locking portions 32, 32A, 32B, 32G, and 32H, which will be described later) are provided.

According to this invention, a metallic connecting member for joining with other members is attached to the outer peripheral surface of the FRP structural member made of fiber-reinforced plastic. Therefore, as in the case where through holes are provided in the FRP structural member and the connecting member is fixed to the FRP structural member by bolts using the through hole, or in the case where the connecting member is welded and fixed to the FRP structural member, the FRP Another member can be joined to an FRP structural member made of fiber-reinforced plastic without causing cross-sectional defects in the structural member.

An FRP structural member with a connecting member according to a third aspect of the invention is characterized in that a gap (for example, a gap S described later) is provided between the joining portion of the other member and the FRP structural member.

According to this invention, a gap is provided between the other member joint portion and the FRP structural member. Therefore, in the event of an earthquake, force acting on other members is transmitted from the joints of other members to the FRP joints, and further transmitted from the FRP joints to the FRP structural members. Therefore, the force acting on other members is not directly transmitted to the FRP structural member, thereby preventing local stress concentration on the FRP structural member and preventing damage to the FRP structural member.

ADVANTAGE OF THE INVENTION According to this invention, the FRP structural member with a connection member which can join another member to the FRP structural member made from fiber-reinforced plastics without producing a cross-sectional defect can be provided.

1 is a perspective view of an FRP structure using an FRP structural member with connecting members according to a first embodiment of the present invention; FIG. 2 is a side view of the FRP structure shown in FIG. 1; FIG. 2 is a longitudinal sectional view of the FRP structure shown in FIG. 1; FIG. 2 is a perspective view of a connecting member of the FRP structural member with a connecting member shown in FIG. 1. FIG. FIG. 10 is a side view of a scaled-down model specimen of an FRP structural member with a connecting member used for a load heating test. 6A and 6B are a cross-sectional view and a cross-sectional view of the reduced model test body of FIG. 5; FIG. FIG. 6 is a perspective view of a connecting member of the reduced model test body shown in FIG. 5; It is a test result of the load heating test of the reduced model specimen shown in FIG. FIG. 8 is a perspective view of a connecting member according to a second embodiment of the present invention; FIG. 11 is a perspective view of a connecting member according to a third embodiment of the present invention; FIG. 11 is a perspective view of a connecting member according to a fourth embodiment of the present invention; FIG. 11 is a perspective view of a connecting member according to a fifth embodiment of the present invention; FIG. 11 is a perspective view of a connecting member according to a sixth embodiment of the present invention; FIG. 21 is a perspective view of a connecting member according to a seventh embodiment of the present invention; 15 is an exploded perspective view of the connecting member shown in FIG. 14; FIG. FIG. 21 is a perspective view of a connecting member according to an eighth embodiment of the present invention; FIG. 21 is a perspective view of a connecting member according to a ninth embodiment of the present invention;

The present invention provides an FRP structure with connecting members, which is composed of fiber-reinforced plastic (FRP) structural members used as column members and beam members of a building beam-column structure, and connecting members provided on the FRP structural members. It is a member. In the present invention, in order to join another member to an FRP structural member, a joining member having a substantially U-shaped cross section or a semicircular cross section is attached to the upper portion of the structural member. In the present invention, there are first to ninth embodiments according to the shape of the connecting member and means of joining with other members (bolt joint, locking).
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same components are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
[First Embodiment]
FIG. 1 is a perspective view of an FRP structure 1 using an FRP structural member 10 with connecting members according to a first embodiment of the present invention. 2 and 3 are a side view and longitudinal sectional view of the FRP structure 1. FIG.
The FRP structure 1 includes an FRP structural member 10 with a connecting member extending in a predetermined direction, and other members joined to the FRP structural member 10 with a connecting member and extending in a direction intersecting the FRP structural member 10 with a connecting member. A small beam 2 is provided.
The FRP structural member 10 with a connecting member includes a large beam 11 as an FRP structural member having a rectangular cross section made of fiber-reinforced plastic, and a metal connecting member provided on the outer peripheral surface of the large beam 11 and to which the small beam 2 is joined. 12 and.

4 is a perspective view of the connecting member 12. FIG.
The connecting member 12 includes an FRP joint portion 20 having a substantially U-shaped cross section provided over the upper portion of the large beam 11 and another member joint portion 30 provided in the FRP joint portion 20 to which the small beam 2 is joined. And prepare.
The FRP joint 20 has a joint surface 21 inscribed in the upper part of the outer periphery of the girders 11 . The joint surface 21 of the FRP joint 20 is adhered to the upper side surface and upper surface of the girders 11 with an epoxy adhesive. The joint surfaces 21 of the FRP joints 20 extend below the intermediate height of the girders 11 as shown in FIGS. preferably.

The other member joint portion 30 includes a bottom plate portion 31 provided at the upper end of the FRP joint portion 20 , and a locking portion 32 and a pair of reinforcing portions 33 erected from the bottom plate portion 31 .
The bottom plate portion 31 is a rectangular plate material, and both longitudinal end surfaces of the bottom plate portion 31 protrude from both end surfaces of the FRP joint portion 20 by a dimension t. The small beam 2 is placed on the bottom plate portion 31 . A gap S is formed between the bottom surface of the bottom plate portion 31 and the girders 11 .
The locking portion 32 is a rectangular plate extending in the longitudinal direction of the girders 11 .
The pair of reinforcing portions 33 are rectangular plate members provided at both longitudinal ends of the large girders 11 of the locking portions 32 and extending in the beam width direction of the large girders 11 . The pair of reinforcing portions 33 are in contact with and sandwich the side surfaces of the small beam 2 .

[Load heating test]
As a demonstration experiment of the present invention, a reduced model test body 40 of FRP structural members with connecting members as shown in FIG. heating test). 5, the display of the veneer laminated material 53 is omitted.
Specifically, a vertical load is applied to two points in the center of the beam span of the reduced model test body, and in this state, multiple burners installed below the reduced model test body heat for 30 minutes according to the ISO standard heating temperature curve. was heated. Then, from the start of heating until about 150 minutes after the end of heating, the amount of vertical deflection at the center position of the beam was measured, and the state of damage to the specimen was visually confirmed.
FIG. 6(a) is a cross-sectional view of the reduced model test piece 40 of FIG. 5 taken along line AA, and FIG. 6(b) is a cross-sectional view of the reduced scale model test piece 40 of FIG. 5 taken along line BB.
The reduced model test body 40 includes a carbon fiber reinforced plastic (CFRP) beam 41 and metal connection members 42 provided at two locations on the beam 41 .
The beam 41 includes a main body 50 having a square cross section and a projecting portion 51 provided on the main body 50 . A pair of angle members 52 made of aluminum alloy is provided on the protruding portion 51 of the beam 41 , and the pair of angle members 52 includes a flame-retardant laminated veneer lumber (LVL) 53 covering the main body 50 of the beam 41 . is provided.
Here, the CFRP allowable stress of the beam 41 is shown in the table below.

Here, the total length of the beam 41 is 7200 mm. Also, the main body 50 of the beam 41 is 162 mm×78 mm×4 mm×6 mm, and the protrusion 51 is 120 mm×6 mm. The angles are L-100mm x 50mm x 5mm and the laminated veneer lumber (LVL) 53 is 35mm thick.

Two portions of the beam 41 are not provided with the projecting portions 51 but are provided with the connecting members 42 .
As shown in FIG. 7, the connecting member 42 includes an FRP joint portion 60 having a substantially U-shaped cross section provided across the main body 50 of the beam 41, and a rectangular parallelepiped shape provided on the FRP joint portion 60. and a lump portion 61 of

With both ends of the reduced model test body 40 supported, a load of about 11.5 kN is applied on the block 61 of the connecting member 42, assuming other members, and heated to 850° C. for 30 minutes. Then, a load heating test was performed. Specifically, the distance between fulcrums was set to 6800 mm, and the distance between connecting members (force points) was set to 2000 mm.
FIG. 8 shows the test results of the load heating test. In this test result, the horizontal axis is the elapsed time, and the vertical axis is the amount of vertical deflection at the center of the beam. As shown in FIG. 8, the amount of vertical deflection at the center of the beam increases substantially in proportion to the passage of time. Therefore, by applying a load to the beam 41 made of carbon fiber reinforced plastic through the connection member 42, the stress is not locally concentrated on the joint portion between the beam 41 and the connection member 42, and the beam 41 is attached to the connection member 42. It can be seen that there is no separation and no bending.

According to this embodiment, there are the following effects.
(1) The connecting member 12 was adhered to the top of the girders 11 . Therefore, compared to the case where through holes are provided in the girders 11 and the connecting members are fixed to the girders 11 by bolts, the girders 11 are not damaged in cross section, and compared to the case where the connecting members are fixed to the girders 11 by welding. , the base material of the girders 11 is not damaged. Therefore, the large girders 11 made of fiber-reinforced plastic can be joined to the small girders 2 relatively easily.

(2) Since the connecting member 12 has a substantially U-shaped cross section and is inscribed in the upper three surfaces of the girders 11, a wide bonding area is secured between the connecting members 12 and the girders 11, and the connecting members 12 are attached to the girders 11. can be securely attached to the In addition, since the connecting member 12 is adhered to the upper part of the large beam 11, even if the large beam 11 is subjected to bending deformation due to the applied load, the amount of deformation of the upper part of the large beam 11 is smaller than that of the lower part. can maintain its adhesion state.
(3) The connecting member 12 has a simple structure made of metal. Since metal has higher rigidity than concrete and is relatively easy to process, the connecting member 12 can be easily manufactured using flat steel or steel pipes. Therefore, since the small beam 2 is joined to the large beam 11 through the metal connection member 12 , stress and deformation occurring in the small beam 2 are smoothly transmitted to the large beam 11 .

(4) During an earthquake, the horizontal force acting on the small beam 2 is transmitted to the large beam 11 via the connecting member 12. At this time, the reinforcing portion 33 extending in the width direction of the large beam 11 is provided at the joint portion 30 of the other member. Therefore, the bending rigidity of the connecting member 12 is improved.

(5) A gap S is provided between the bottom plate portion 31 of the connecting member 12 and the girders 11 . Therefore, during an earthquake, the force acting on the small beam 2 is transmitted to the other member joint portion 30 of the connecting member 12 and then transmitted to the large beam 11 via the FRP joint portion 20 . Therefore, the force acting on the small girders 2 is not directly transmitted to the large girders 11, so that local concentration of stress on the large girders 11 can be prevented, and damage to the large girders 11 can be prevented.

[Second embodiment]
FIG. 9 is a perspective view of a connecting member 12A according to the second embodiment of the invention.
The present embodiment differs from the first embodiment in that the engaging portion 32A is a pair of triangular plate members.
According to this embodiment, in addition to the effects (1) to (5) described above, the following effects are obtained.
(6) The engaging portion 32A of the connecting member 12A is not a rectangular plate but a pair of triangular plate members. Therefore, it is possible to reduce the cross-sectional loss of the small beam 2 arranged straddling the locking portion 32A of the connecting member 12A.

[Third embodiment]
FIG. 10 is a perspective view of a connecting member 12B according to the third embodiment of the invention.
This embodiment differs from the first embodiment in that the engaging portion 32B is not a plate but two studs.
According to this embodiment, in addition to the effects (1) to (5) described above, the following effects are obtained.
(7) The locking portion 32B of the connecting member 12B is made of a stud material instead of a plate material. Therefore, when the small beam 2 joined to the connecting member 12B is made of concrete, unlike the case where the locking portion is made of a plate material, the shear resistance is not limited to a specific direction, and the same shear resistance is applied in all directions in the horizontal plane. power can be secured.

[Fourth embodiment]
FIG. 11 is a perspective view of a connecting member 12C according to the fourth embodiment of the invention.
This embodiment differs from the first embodiment in that the other member joint portion 30</b>C does not include a bottom plate portion, a locking portion, and a reinforcing portion, and includes a bolt joint portion 34 .
The bolt joint portion 34 is a rectangular plate member erected on the FRP joint portion 20 and extending in the longitudinal direction of the girders 11 . The bolt joint 34 is provided with a through hole 35 through which a bolt can be inserted.
According to this embodiment, the same effects as (1) to (3) and (5) are obtained.

[Fifth embodiment]
FIG. 12 is a perspective view of a connecting member 12D according to the fifth embodiment of the invention.
This embodiment differs from the fourth embodiment in that the other member joint portion 30D includes a rectangular parallelepiped bottom plate portion 31D.
According to this embodiment, the same effects as (1) to (5) described above are obtained.

[Sixth embodiment]
FIG. 13 is a perspective view of a connecting member 12E according to the sixth embodiment of the invention.
The present embodiment differs from the first embodiment in that both longitudinal end surfaces of the bottom plate portion 31E are flush with both end surfaces of the FRP joint portion 20 .
According to this embodiment, the same effects as (1) to (5) described above are obtained.

[Seventh embodiment]
FIG. 14 is a perspective view of a connecting member 12F according to the seventh embodiment of the invention. FIG. 15 is an exploded perspective view of the connecting member 12F.
This embodiment differs from the first embodiment in that the FRP joint portion 20F of the connecting member 12F is separable.
That is, the FRP joint portion 20F of the connecting member 12F has a joint surface 21F inscribed in the outer circumference of the girders 11 over the entire circumference, and can be divided into the first FRP joint portion 22 and the second FRP joint portion 23. . The first FRP joint portion 22 is integrated with the other member joint portion 30, and the bottom plate portion 31 of the other member joint portion 30 is formed with a female screw portion 36 that penetrates the upper portion of the first FRP joint portion 22. . A female screw portion 37 is also formed on the upper portion of the second FRP joint portion 23 .
In this connection member 12F, the upper portion of the second FRP joint portion 23 is superimposed on the upper portion of the first FRP joint portion 22, and the bolt 38 is screwed into the female screw portions 36 and 37 from above the bottom plate portion 31 of the other member joint portion 30. Then, the second FRP joint 23 is fixed to the first FRP joint 22, and the FRP joint 20F covers the entire circumference of the girder 11. As shown in FIG.
According to this embodiment, the same effects as (1) to (5) described above are obtained.

[Eighth embodiment]
FIG. 16 is a perspective view of a connecting member 12G according to the eighth embodiment of the invention.
This embodiment differs from the first embodiment in that the girders 11G have a circular cross-section and the FRP joints 20G have a semi-circular cross-section.
In addition, in the present embodiment, the other member joint portion 30G includes a locking portion 32G erected on the upper surface of the FRP joint portion 20G and fan-shaped reinforcing portions 33G provided at both ends of the locking portion 32G. Prepare. According to this embodiment, the same effects as (1) to (5) described above are obtained.

[Ninth Embodiment]
FIG. 17 is a perspective view of a connecting member 12H according to the ninth embodiment of the invention.
This embodiment differs from the eighth embodiment in that the engaging portion 32H is not a plate but two studs.
Further, in the present embodiment, the reinforcing portions 33H are provided at both longitudinal ends of the large beam 11G of the FRP joint portion 20G.
According to this embodiment, the same effects as (1) to (5) and (7) are obtained.

It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.
For example, in each of the above embodiments, the FRP structural members are the girders 11 and 11G. You may attach a metal connection member to the joint part with a floor slab.

1... FRP structure 2... Small beam (other members)
10... FRP structural member with connecting member 11, 11G... Large beam (FRP structural member)
12, 12A, 12B, 12C, 12D, 12E, 12F, 12G, 12H... Connecting member 20, 20F, 20G... FRP joint part 21, 21F, 21G... Joint surface 22... First FRP joint part 23... Second FRP joint part 30 , 30A, 30B, 30C, 30D, 30E, 30G, 30H... Other member joint parts 31, 31D, 31E... Bottom plate parts 32, 32A, 32B, 32G, 32H... Locking parts 33, 33G, 33H... Reinforcing parts 34... Bolt joint 35 Through hole 36, 37 Internal thread 38 Bolt 40 Specimen 41 Beam 42 Connecting member 50 Main body 51 Protruding part 52 Angle material 53 Veneer laminated material 60 FRP joint 61 …mass

Claims (1)

FRP structural members made of fiber-reinforced plastic used for beam-column structures of buildings ,
a metal connecting member for joining with other members attached to the outer peripheral surface of the FRP structural member ,
The connection member includes an FRP joint portion that is joined to the FRP structural member, and another member joint portion that is joined to the other member,
The FRP joint has a joint surface inscribed in at least a part of the outer periphery of the FRP structural member,
The other member joint portion is provided with a through hole and/or a locking portion for joining with the other member,
An FRP structural member with a connecting member, wherein a gap is provided between the joining portion of the other member and the FRP structural member.

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