JP2022006894A - Reinforcing structure of joint part of wooden structure provided with fracture confirmation portion - Google Patents

Abstract

To provide a reinforcing structure of a joint part of a wooden structure capable of easily discriminating fracture from the outside and fracturing in a fracture mode having high ductility.SOLUTION: In a reinforcing structure of a joint part of a wooden structure for joining a plurality of structural materials (a foundation 2, a base 3, and a column 4) of the wooden structure, an FRP sheet 5 having reinforcing fibers formed by laminating a single layer or a plurality of layers of unidirectional fiber materials or bidirectional cross fiber materials is attached to surfaces of the plurality of structural materials (the foundation 2, the base 3, and the column 4) over the plurality of structural materials. A fracture confirmation part A capable of confirming whether or not a joint part is broken is provided in a part of the FRP sheet 5. The fracture confirmation part A is mechanically fixed to the structural material (the foundation 2) by a screw 6 without bonding the FRP sheet 5 to the structural material (foundation 2), and the number of layers of reinforcing fibers and the number of screws are set so that fracture of the FRP sheet 5 around the screw 6 precedes other fracture.SELECTED DRAWING: Figure 1

Description

The present invention relates to a reinforcing structure of a joint portion of a wooden structure in which a main structural material such as a wooden frame construction method, a wooden frame wall construction method, and a wooden rigid frame construction method is made of a wood material.

Insert needle-shaped or rod-shaped connectors such as nails, screws, and bolts into the joints that join the main structural materials made of wood-based materials such as pillars and beams, pillars and bases, and beams to each other. It is joined by. For example, when joining a pillar and a base, a metal plate that comes into contact with the surface of any of the structural materials of the pillar and the base is attached by attaching with screws or nails.

In addition, if the columns are to be tied to a reinforced concrete foundation so that they will not rise when a horizontal force such as an earthquake or typhoon acts, J-shaped or U-shaped anchor bolts should be buried in the foundation in advance. The upper end of the anchor bolt that is exposed through the base is fixed to the pillar via the hole-down hardware. Anchor bolts embedded in the foundation in advance are bolted to the foundation, and the pillar and the base are joined via a metal plate, so that the pillar can be tied to the foundation.

However, metal connection fittings (connectors) such as metal plates, nails, screws, and bolts are generally stronger than wood materials, and when an external force acts on the joints of such wood structures, , Stress concentrates on the needle-shaped or rod-shaped connector. Therefore, when a strong tensile force is applied to the joint portion of such a wooden structure, the tensile strength of the wood material in the direction perpendicular to the fibers is low, so that the force that pulls the fibers apart cannot be withstood, and the wooden structure cannot withstand the force. There is a problem that the structural material causes brittle fracture such as split fracture (fracture that splits along the fiber direction). If brittle split fracture occurs in such a structural material, the wooden structure itself may collapse.

Therefore, the brittle fracture mode balances various strengths such as the strength of the above-mentioned wood (wood-based material), the strength of the bond between the wood and the fitting, the strength of the metal plate, and the strength of the bond between the foundation and the base or pillar. Instead, it is required that the joint portion of the wooden structure absorbs sufficient energy and is joined so as to be in a fracture mode having high ductility and toughness. It is also requested that the joints and reinforcing members of wooden structures be plastically deformed and destroyed by external forces such as earthquakes and typhoons, so that it can be easily determined whether or not a new one needs to be replaced. ing.

In the reinforcing structure of the joint portion of such a wooden structure, it is also attempted to join without using a metal member that corrodes and deteriorates over time. For example, Patent Document 1 describes a method for reinforcing a wood joint in which a reinforcing tool 1 made of carbon fiber reinforced plastic is adhered to the surface of wood to reinforce the pillar-beam joint of a wooden structure (wooden building). And the reinforcing structure are disclosed (see paragraphs [0072] to [0076] in the specification of Patent Document 3, FIG. 10 in the drawing, and the like).

However, in the method for reinforcing a wood joint portion described in Patent Document 1, it is considered that the wood joint portion may be broken by the wood which is the base material, and the joint portion of the wooden structure necessarily absorbs sufficient energy. Therefore, they were not joined so as to have a fracture mode with high ductility and toughness. In addition, in order to easily determine whether or not a new product needs to be replaced, a weak point portion that is destroyed in a highly ductile destruction mode has not been provided at a position where destruction can be easily determined from the outside. ..

Japanese Patent No. 6150361

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object thereof is a wooden structure in which fracture can be easily discriminated from the outside and fractured in a highly ductile fracture mode. The purpose is to provide a reinforcing structure for the joint.

The reinforcing structure of the joint portion of the wooden structure according to the first invention is a reinforcing structure of the joint portion of the wooden structure for joining a plurality of structural materials of the wooden structure, and is a one-way fiber material or a two-way cross fiber material. An FRP sheet having reinforcing fibers in which a single layer or a plurality of layers are laminated is attached to the surface of the plurality of structural materials, and it can be confirmed whether or not the joint portion is broken in a part of the FRP sheet. A confirmation portion is provided, and the FRP sheet is mechanically fastened to the structural material with a needle-shaped connector such as a screw, a nail, or a tacker without the FRP sheet being adhered to the structural material. In addition, the number of layers of the reinforcing fibers and the number of the connecting tools are set so that the tearing of the FRP sheet around the connecting tool precedes other breakage.

In the first invention, the reinforcing structure of the joint portion of the wooden structure according to the second invention is such that the FRP sheet is adhered to the structural material at least a part of the portion of the FRP sheet excluding the failure confirmation portion. Above, it is characterized in that it is mechanically fastened to the structural material by the connector.

In the second invention, the reinforcing structure of the joint portion of the wooden structure according to the third invention is such that the adhesive strength of the FRP sheet adhered to the structural material is such that the FRP sheet around the connector is torn. It is characterized by being higher.

The reinforcing structure of the joint portion of the wooden structure according to the fourth invention is the joint portion in any one of the first inventions to the third invention, wherein the joint portion is a joint portion for joining three structural materials of a foundation, a base and a column. And
The failure confirmation unit is characterized in that the FRP sheet is a portion covering the foundation.

According to the first to fourth inventions, since the destruction confirmation unit for confirming whether or not the joint portion has been destroyed is provided, the destruction can be easily identified from the outside, and the damage to the wooden structure due to the earthquake or typhoon can be easily determined. It becomes easy to make a decision on repair or repair by grasping. Further, according to the first to fourth inventions, the fracture of the FRP sheet around the connector precedes the other fractures, so that the joint portion is fractured in a highly ductile fracture mode. For this reason, the wooden structure does not collapse at once even in a large earthquake, and it is possible to secure time for residents and the like to evacuate.

In particular, according to the second and third inventions, since the adhesive strength is added in addition to the mechanical joining, it becomes easy to provide a weak point portion that causes ductile fracture, and the FRP sheet around the fitting is surely provided. Rupture can precede other destruction.

In particular, according to the fourth invention, ductile fracture, which is a preferable fracture mode, is performed with less finish at the joint between the foundation, the foundation and the column, which is the most deadly and easily damaged among the plurality of joints of the wooden structure. It is possible to wake up the foundation that is the easiest to confirm in advance. Therefore, it is possible to quickly determine whether or not the entire wooden structure has been damaged by an external force such as an earthquake or a typhoon.

FIG. 1 is a perspective view showing a reinforcing structure of a joint portion of a wooden structure according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view showing the same reinforcing structure. 3A and 3B are enlarged cross-sectional views of FIG. 2, where FIG. 3A shows a joint portion between a pillar and an FRP sheet, and FIG. 3B shows a joint portion between a foundation and an FRP sheet. FIG. 4 is a graph showing a load-displacement curve of the specimen. 5A and 5B are schematic views showing the deformation mechanism of the test piece, in which FIG. 5A is a front view and FIG. 5B is a cross-sectional view, and is shown in chronological order in the order of (1) to (3). 6A and 6B are schematic views showing the yield mechanism of the test piece, where FIG. 6A is a front view, FIG. 6B is a cross-sectional view, and FIGS. Is shown. FIG. 7 is a photograph showing a fracture state of a joint portion in which FRP is adhered to a base and a pillar and fastened with screws.

Hereinafter, the reinforcing structure of the joint portion of the wooden structure according to the embodiment of the present invention will be described in detail with reference to the drawings.

First, with reference to FIGS. 1 to 3, the reinforcing structure 1 of the joint portion of the wooden structure according to the embodiment of the present invention (hereinafter, may be simply referred to as the reinforcing structure 1) will be described. FIG. 1 is a perspective view showing a reinforcing structure 1 of a joint portion of a wooden structure according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing the reinforcing structure 1. Further, FIG. 3 is an enlarged cross-sectional view of FIG. 2, where (a) shows a joint portion between a pillar and an FRP sheet, and (b) shows a joint portion between a foundation and an FRP sheet.

As shown in FIG. 1, the reinforcing structure 1 according to the present embodiment exemplifies a detached building constructed by a general wooden frame construction method as a wooden structure, and the foundation 2 and the foundation which are the main structural materials thereof. The case where it is applied to the joint portion of the three structural materials of 3 and the pillar 4 will be illustrated and described. The X direction in the drawing is the girder direction X, the Y direction is the beam-to-beam direction, and the Z direction is the vertical direction.

As shown in FIG. 1, the reinforcing structure 1 according to the present embodiment has a reinforced concrete foundation 2 installed with the girder direction X as the longitudinal direction, and a foundation installed on the foundation 2 with the girder direction X as the longitudinal direction. 3 and a pillar 4 installed on the base 3 with the vertical direction Z as the longitudinal direction are provided. Further, the reinforcing structure 1 includes an FRP sheet 5 that covers and joins an outer surface (surface) from the foundation 2 to the column 4 in order to prevent the column 4 from coming out of the base 3 and collapsing during an earthquake or a typhoon. I have.

(Basic)
The foundation 2 is a general reinforced concrete cloth foundation or solid foundation. Of course, the foundation 2 is not limited to reinforced concrete, and may be made of other materials having a predetermined strength, such as those made of blocks.

(Base and pillar)
The base 3 and the pillar 4 are the main structural materials in terms of the structural strength of the building, and are made of general wood. Of course, it goes without saying that the base 3 and the pillar 4 may be other wood materials such as laminated lumber (LW: laminated wood) and veneer laminated lumber (LVL: Laminated Veneer Lumber). This is because laminated lumber and veneer laminated lumber can be reinforced by attaching an FRP sheet, which will be described later, to the surface in the same manner as ordinary wood.

As shown in FIG. 1, since the base 3 is installed on the foundation 2 with the girder direction X as the longitudinal direction, the fiber direction of the wood is also installed along the girder direction X. Further, as shown in FIG. 1, since the pillar 4 is erected on the base 3 with the vertical direction Z as the longitudinal direction, the fiber direction of the wood is installed along the vertical direction Z.

(FRP sheet)
The FRP sheet 5 is a sheet-like member made of carbon fiber reinforced plastics (CFRP: Carbon Fiber-Reinforced Plastics) obtained by using carbon fibers as reinforcing fibers and impregnating them with a matrix resin to cure them. The FRP sheet 5 is a fiber-reinforced plastic (FRP) in which a plurality of layers of reinforcing fibers are laminated, and it is possible to easily set the tensile strength and the tear strength of the fibers. The FRP sheet 5 may be laminated so that the fiber directions of the one-way fiber material ((UD: Uni-Direction) fiber material) are alternately orthogonal to each other to impregnate the matrix resin, or the two-way cross fiber material. May be impregnated with a matrix resin. However, the reinforcing fibers of the FRP sheet 5 need not only counteract the tensile force applied to the structural material, but also the shearing force due to the screw and the compressive (buckling) force due to the repeated stress. It is preferably a fine cloth material.

The reinforcing fiber is not limited to carbon fiber, but may be aramid fiber or glass fiber, or may be another continuous fiber reinforcing material such as boron fiber or metal fiber. In short, the reinforcing fiber may be a long continuous fiber having a predetermined tensile strength. However, carbon fiber has a very high tensile strength of about 2690 N / mm ² even in a general grade, has a specific gravity of 1/4 that of iron, a specific strength of 10 times, and a specific elastic modulus of 7 times, which is excellent. Since it has mechanical properties, it is more suitable than other continuous fiber reinforcing materials.

The matrix resin may be a thermosetting resin such as an epoxy resin or a thermoplastic resin such as a polyamide resin. That is, the matrix resin may be appropriately selected depending on the continuous fiber reinforcing material which is a reinforcing fiber and the application.

As shown in FIG. 1, the FRP sheet 5 is formed into a vertically long rectangular plate having a predetermined thickness, and is provided with a plurality of screw holes 5a for screwing with screws 6 described later. There is.

Then, as shown in FIGS. 2 and 3, the upper portion of the FRP sheet 5 is bonded to the pillar 4 with an adhesive 7 and then mechanically screwed with a screw 6 to be fixed. Further, the lower portion of the FRP sheet 5 is not adhered to the foundation 2 but is mechanically screwed and fastened with screws 6. Further, the portion A in FIGS. 1 and 2 that covers the foundation 2 at the lower part of the FRP sheet 5 is a fracture confirmation portion A that can confirm whether or not the joint portion has been destroyed.

The FRP sheet 5 is not fixed to the base 3. The joint between the pillar 4 and the FRP sheet 5 that are completely joined, the joint between the foundation 2 and the FRP sheet 5 that are joined as weak points so as to cause ductile fracture, and the base as a buffer zone between the two joints. This is so that the behavior of 3 does not affect the destruction confirmation unit A.

(Screw: Connector)
The screw 6 is a wood screw exemplified as a needle-shaped connector for connecting each structural material and the FRP sheet 5, and in the illustrated form, a square bit screw is exemplified. Of course, the connecting tool according to the present invention is not limited to the screw 6, and the material or the like is particularly as long as it can mechanically connect each structural material and the FRP sheet 5 with a needle-shaped connecting tool such as a nail or a tacker. Not limited.

(glue)
The adhesive 7 is an adhesive that adheres each structural material to the FRP sheet 5, and an adhesive such as a modified silicon resin or an epoxy resin is preferable. However, the adhesive according to the present invention is not particularly limited as long as it has good adhesiveness between the pillar 4 made of wood and the FRP sheet 5 made of resin. As the adhesive 7, an adhesive 7 having a high adhesiveness between the pillar 4 made of wood and the FRP sheet 5 is selected, and the surrounding FRP sheet 5 is reinforced by the screw 6 by selecting the number of layers of the reinforcing fibers and the like. The adhesive strength between the column 4 and the FRP sheet 5 is made higher than the strength at which the FRP sheet 5 around the screw 6 is torn so that the fiber rupture occurs first.

<Destruction progress confirmation test>
Next, the results of a test conducted to confirm the progress of fracture when FRP is adhered to the joint between the base and the pillar and then screwed will be described.

FIG. 4 is a graph showing a load-displacement curve of the specimen. In the graph shown in FIG. 4, a specimen of a column base joint portion similar to the joint portion between the column 4 and the base 3 described above is prepared, and an FRP sheet similar to the FRP sheet 5 described above is bonded thereto. It is a test result of fixing with a screw, repeatedly applying a load (kN) upward using a load cell in the direction in which the pillar is pulled out from the base, and measuring the slip amount (mm) which is the average displacement.

This test is based on the allowable stress design of wooden frame construction method housing (2017 version: Japan Housing and Wood Technology Center), and the load applying method is upward one-way repeated application. Repeatedly pulling and returning to 0.5 times, 1 time, 2 times, 4 times, 6 times, 8 times, 12 times, and 16 times the yield displacement obtained in the monotonic tensile test in advance, and finally the maximum load. Monotonic tension was applied until the load was reduced to 50%.

In addition, multiple types of FRP sheets were prepared and tested, such as those in which the number of layers of reinforcing fibers was changed and the surface finish was pressed with a mold to make it smooth, and those in which the unevenness of the bundle of reinforcing fibers was left. .. In addition, two types of modified silicone resin-based adhesives and one type of epoxy resin-based adhesives were prepared, and the compatibility between the wood and the FRP sheet was confirmed.

5A and 5B are schematic views showing the deformation mechanism of the test piece, in which FIG. 5A is a front view and FIG. 5B is a cross-sectional view, and is shown in chronological order in the order of (1) to (3). 6A and 6B are schematic views showing the yield mechanism of the test piece, where FIG. 6A is a front view, FIG. 6B is a cross-sectional view, and FIGS. ) Indicates the state.

As for the progress of deformation due to the repeated load of the joint where FRP is bonded to the base and the pillar and fastened with screws, first, as shown in FIG. 5 (2), the adhesive layer between the FRP sheet and the base is broken, and the FRP sheet is broken. The lower part of the base peels off from the surface of the base. At this time, as shown in FIG. 4, the maximum load is shown and the yield occurs.

However, even if the adhesive layer is broken and the FRP sheet is partially peeled off, the lower portion of the FRP sheet is fixed to the base by screws. Therefore, as shown in FIG. 5 (3), the deformation progresses further and the pillars are lifted, so that the reinforcing fibers of the FRP sheet are torn by the fixed screws. At this time, in the range shown by the ellipse in FIG. 4, the reinforcing fiber having high tensile strength is partially torn, so that a slip amount is generated with a certain load, and the property of ductile fracture progresses while absorbing energy. Can be confirmed to indicate.

In this way, when the FRP sheet is bonded and screwed together at the joint of the wooden structure, the joint of the wooden structure absorbs energy and is joined so as to have a fracture mode with high ductility and toughness. It can be said that it can be done.

On the other hand, as described in the background technology, when a metal rod-shaped or needle-shaped connector such as a conventional hole-down hardware is fastened to wood for joining, a metal connection fitting (connection) with high strength is used. Stress is concentrated on the tool). For this reason, there is a possibility that the structural material of the wooden structure may cause brittle fracture such as split fracture because it cannot withstand the force of pulling the fibers toward the outside transmitted from the connector.

On the other hand, when the FRP sheet is bonded and screwed together at the joint of the wooden structure, the final fracture mode is as shown in FIG. 6 (4), due to the progress of the tearing of the FRP sheet, the screw head becomes Either the FRP sheet is passed through and punched out, or as shown in FIG. 6 (4'), the FRP sheet is torn to the end and the screw is pulled out (see also FIG. 7). FIG. 7 is a photograph showing a fracture state of a joint portion in which FRP is adhered to a base and a pillar and fastened with screws.

From the viewpoint that the combined use of screwing with such FRP results in ductile fracture in which deformation progresses while absorbing energy, the inventor of the present application further advances the idea and screws the FRP sheet that is normally bonded. I came up with the idea that it is possible to provide a weak point that is destroyed in a highly ductile destruction mode by using only a stop. Then, in order to easily determine whether or not a new product needs to be replaced, this weak point portion is provided at a position where the destruction can be easily determined from the outside to serve as the destruction confirmation unit A.

<Destruction confirmation unit>
Next, the destruction confirmation unit A will be described in detail. As described above, the fracture confirmation portion A of the reinforcing structure 1 according to the embodiment of the present invention is the A portion of FIGS. 1 and 2 in which the foundation 2 is covered with the lower portion of the FRP sheet 5. Normally, the foundation 2 of a wooden building is finished by applying mortar or the like as a finishing material to adjust the unevenness (unevenness), and the finishing material is less than that of attaching the outer wall to the outside of the pillar 4. Therefore, the lower portion of the FRP sheet 5, which is the destruction confirmation unit A, can easily confirm the destruction status of the FRP sheet 5 from the outside.

Specifically, it is visually confirmed whether the screw 6 of the FRP sheet 5 is punched out or whether the FRP sheet 5 is broken to the end and the screw 6 is pulled out (see FIG. 7). At this time, if the destruction is progressing, the mortar or the like applied to the foundation 2 is also peeled off, and it can be easily visually confirmed from the outside of the building. Even if the destruction has not progressed, it is possible to easily visually check from the outside of the building by knocking down the mortar or the like.

Further, the lower portion of the FRP sheet 5, which is the fracture confirmation portion A, is not adhered to the foundation 2 but is mechanically screwed and fastened with screws 6. On the other hand, the upper part of the FRP sheet 5 is bonded to the pillar 4 with an adhesive 7 and then mechanically screwed with a screw 6 to be fastened. It is clear that the adhesive strength of the adhesive 7 is added.

Therefore, in the fracture confirmation unit A, as shown in FIGS. 4 to 6, the fracture of the FRP sheet 5 around the screw 6 which is a connector precedes other fractures, so that the joint portion has high ductility. It will be destroyed in the destruction mode.

The FRP sheet 5 is a fiber reinforced plastic in which a plurality of layers of reinforcing fibers are laminated, and by increasing or decreasing the number of layers of the reinforcing fibers, the FRP sheet 5 may be torn before other fractures. It can be set easily. The destruction mode can also be controlled by increasing or decreasing the number of screws 6 for fixing the FRP sheet 5. Specifically, by creating specimens for each pattern and conducting the above-mentioned repeated load force test to grasp the load and slip amount, the optimum reinforcing fiber according to the structural calculation of the wooden structure. Set the number of layers, the number of screws 6, and the like. In wooden buildings, the dimensions of each structural material are standardized to some extent, and it is considered easy to grasp these.

On the other hand, a metal plate such as a conventional hole-down metal plate has higher strength than wood, and even if a thin steel plate is used, it is not possible to make extremely fine adjustments for controlling the fracture mode.

In short, since the reinforcing structure 1 does not have the adhesive force of the adhesive 7, the fracture confirmation portion A is a clearly weak point portion, and even if the screw 6 of the FRP sheet 5 punches out at this portion, the breakage of the FRP sheet 5 ends. If it can be confirmed that the reinforcement structure 1 has not progressed to the part, it can be concluded that the reinforcing structure 1 has reached yield and can be used continuously. Therefore, it is possible to easily determine whether or not the reinforcing structure 1 needs to be repaired or repaired simply by visually observing the fracture confirmation unit A from the outside.

According to the reinforcing structure 1 of the joint portion of the wooden structure according to the embodiment of the present invention described above, since the destruction confirmation portion A is provided, the destruction can be easily identified from the outside, and the wooden structure due to an earthquake or a typhoon can be easily identified. It becomes easy to grasp the damage of the object and make a repair or repair decision.

Further, according to the reinforcing structure 1, the FRP sheet 5 around the screw 6 which is a connector is broken before other breaks, so that the FRP sheet 5 is broken in a highly ductile break mode. For this reason, the wooden structure does not collapse at once even in a large earthquake, and it is possible to secure time for residents and the like to evacuate.

Moreover, the reinforcing structure 1 is a joint between a foundation, a base, and a column, which is most susceptible to deadweight and damage among a plurality of joints of a wooden structure. Therefore, it is possible to quickly determine whether or not the entire wooden structure has been damaged by an external force such as an earthquake or a typhoon simply by visually checking the fracture confirmation unit A.

In addition, although the reinforcing structure 1 uses screws 6, the main structural materials are only wood, concrete, and FRP, and it does not use metal materials such as conventional hole-down hardware, and it rusts. As a result, the risk of deterioration over time is much slower, and the durability of wooden structures can be improved. The screw 6 can also be made of stainless steel or a resin material. Further, the FRP sheet 5 is extremely lightweight and can be reinforced, and the weight of the wooden structure itself can be reduced.

The reinforcing structure 1 of the joint portion of the wooden structure according to the embodiment of the present invention has been described in detail above. However, all of the above-mentioned or illustrated embodiments show only one embodiment embodied in carrying out the present invention. Therefore, the technical scope of the present invention should not be construed in a limited manner by the illustrated embodiments.

In particular, as a wooden structure, a detached building constructed by the general wooden frame construction method was illustrated as an example, but the main structural materials such as the wooden frame construction method, the wooden frame wall construction method, and the wooden rigid frame construction method are made of wood. The present invention can be applied to the reinforcing structure of the joint portion of the wooden structure composed of. Further, although the joint between the base, the pillar and the foundation has been described as an example, the present invention can be applied to the joint between the structural members of the wooden structure.

1: Reinforcing structure of the joint of the wooden structure 2: Foundation (structural material)
3: Base (structural material)
4: Pillar (structural material)
5: FRP sheet 5a: screw hole 6: screw (connector)
7: Adhesive (adhesive layer)
X: Column direction Y: Beam-to-beam direction Z: Vertical direction

Claims (4)

It is a reinforcing structure of the joint part of the wooden structure that joins multiple structural materials of the wooden structure.
FRP sheets having reinforcing fibers in which one-way fiber materials or two-way cross fiber materials are laminated in a single layer or in multiple layers are attached to their surfaces over the plurality of structural materials.
A fracture confirmation unit is provided on a part of the FRP sheet so that it can be confirmed whether or not the joint portion has been destroyed.
In the destruction confirmation unit, the FRP sheet is not adhered to the structural material, but is mechanically fastened to the structural material with a needle-shaped connector such as a screw, a nail, or a tacker, and the connector is attached. A reinforcing structure for a joint portion of a wooden structure, characterized in that the number of layers of the reinforcing fibers and the number of connecting tools are set so that the tearing of the FRP sheet around the FRP sheet precedes other fractures. At least a part of the FRP sheet other than the destruction confirmation portion is characterized in that the FRP sheet is adhered to the structural material and then mechanically fixed to the structural material by the connector. The reinforcing structure of the joint portion of the wooden structure according to claim 1. The joining of the wooden structure according to claim 2, wherein the FRP sheet has a higher adhesive strength adhered to the structural material than the strength at which the FRP sheet around the fitting is torn. Reinforcing structure of the part. The joint is a joint that joins the three structural materials of the foundation, foundation, and pillar.
The reinforcing structure for a joint portion of a wooden structure according to any one of claims 1 to 3, wherein the fracture confirmation portion is a portion where the FRP sheet covers the foundation.

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