JP7637337B2 - Shear wall panel connection structure - Google Patents

Description

The present invention relates to a bearing wall panel connection structure for installing bearing wall panels that bear the horizontal load of a building.

Conventionally, there are known joining hardware that has a plate that can be inserted into a slit provided at the end of a wooden beam or the base of a column, and that joins beams and columns. For example, in Patent Document 1, both sides of a horizontal plate that abuts the top surface of a through beam hang down and contact both sides of the beam, a vertical column base fixing plate protrudes from the horizontal plate on the top surface, and beam support plates are formed on both sides to fix the end of the beam.

It is also known to use solid, highly rigid wooden boards such as cross-laminated timber (CLT) as load-bearing walls. Such highly rigid load-bearing walls ensure the earthquake resistance of buildings while reducing the amount of load-bearing wall compared to conventional methods, and allow for greater design freedom, such as providing large openings around the perimeter of buildings. However, load-bearing wall panels such as cross-laminated timber are themselves almost unable to deform, so there is a problem of forces concentrating at the joints with structural framework such as foundations, beams, and floors.

It is known that the metal joints that join the load-bearing wall panels to the beams can be made to have deformation capabilities to absorb horizontal forces applied to the building during earthquakes and other events. For example, Patent Document 2 describes a configuration in which a yieldable metal joint is provided between a wooden load-bearing wall panel and a wooden beam, and horizontal forces applied to the load-bearing wall panel are absorbed by the deformation of the metal joint. Patent Document 3 describes a load-bearing wall panel with a notch formed in the upper or lower corner, in which a metal joint secured by an anchor driven into the beam is placed in the notch and joined to the load-bearing wall panel in a deformable manner.

Japanese Patent Application Publication No. 10-54085 JP 2019-196669 A JP 2018-162602 A

However, in the joint structures for joining a load-bearing wall panel and a beam as in Patent Document 2 and Patent Document 3, the beam is fixed to the top or bottom of the beam at the middle of its length with bolts or the like, and the ends of the beam are joined to columns or the like via beam support hardware. Therefore, it is not possible to have the load-bearing wall panel bear the vertical load of the building and omit the columns.

In addition, when the horizontal force of the building is applied from the load-bearing wall panel to the metal joint, the load is transferred to the beam. Even if the horizontal force is absorbed by the deformation of the metal joint, the corners of the load-bearing wall panel or the metal joint itself may sink into the beam, causing damage to the beam.

Therefore, the present invention aims to provide a joint structure for bearing wall panels that can absorb horizontal forces at the joints of the bearing wall panels and prevent the load of the bearing wall panels subjected to the horizontal force of the building from being transmitted to the beams, thereby suppressing damage to the beams.

The first bearing wall panel connection structure of the present invention comprises bearing wall panels formed in a rectangular flat plate shape and arranged side by side on upper and lower floors to bear the horizontal load of a building, a first fixing plate formed protruding from the lower end of the bearing wall panel on the upper floor, a second fixing plate formed protruding from the upper end of the bearing wall panel on the lower floor, a joint member formed in a rectangular parallelepiped shape with a first protruding plate protruding from the upper surface and a second protruding plate protruding from the lower surface, and a second joint member fixed to the first fixing plate and the first protruding plate from the out-of-plane direction of the bearing wall panel to connect the first fixing plate and the first protruding plate. The joint member is provided with one connection member and a second connection member that is fixed to the second fixed plate and the second protruding plate from the out-of-plane direction of the load-bearing wall panel and connects the second fixed plate and the second protruding plate, the first connection member and the second connection member are plastically deformable by the horizontal force transmitted from the load-bearing wall panel, the joint member has beam support plates formed by protruding horizontally from two or more sides, the beam support plates are inserted into slits provided at the ends of wooden beams, and the drift pins that penetrate the wooden beams are perpendicular to each other to support the ends of the beams.

The second load-bearing wall panel connection structure of the present invention is characterized in that, in addition to the features of the first load-bearing wall panel connection structure, the first connection member and the second connection member are detachably fixed to the first fixing plate or the second fixing plate, and the first protruding plate or the second protruding plate.

The third load-bearing wall panel connection structure of the present invention is characterized in that, in addition to the features of the first or second load-bearing wall panel connection structure, the first connection member has a rectangular joint plate that abuts against the first fixed plate and the first protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the joint plate in a flat shape perpendicular to the joint plate, and the second connection member has a rectangular joint plate that abuts against the second fixed plate and the second protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the joint plate in a flat shape perpendicular to the joint plate.

The fourth bearing wall panel connection structure of the present invention is characterized in that, in addition to the features of any one of the first to third bearing wall panel connection structures, the first fixing plate, the second fixing plate, the first protruding plate, the second protruding plate, the first connecting member, and the second connecting member are made of steel having a predetermined fire resistance performance, the bearing wall panel is a wooden bearing wall panel, and a fireproof plate is disposed between the bearing wall panel and the wooden beam.

According to the first load-bearing wall panel connection structure of the present invention, the horizontal force of the building concentrated at the joint of the load-bearing wall panels can be absorbed by the plastic deformation of the first connection member connecting the first fixing plate formed protruding from the lower end of the load-bearing wall panel of the upper floor and the first protruding plate protruding from the upper surface of the joint member, and the plastic deformation of the second connection member connecting the second fixing plate formed protruding from the upper end of the load-bearing wall panel of the lower floor and the second protruding plate protruding from the lower surface of the joint member, resulting in a building with high toughness against earthquake loads. Furthermore, the vertical load of the building applied to the load-bearing wall panel of the upper floor and the horizontal load of an earthquake, etc. can be transmitted to the load-bearing wall panel of the lower floor by the joint member without passing through the wooden beam, so that a large load is not applied to the wooden beam and damage to the wooden beam can be suppressed. Furthermore, the joint member has beam support plates protruding horizontally from two or more sides, and the ends of the wooden beams are supported by the beam support plates, so that the joint member can not only play a role in connecting the upper and lower load-bearing wall panels, but also play a role in supporting the ends of the wooden beams. The joint members support the ends of the wooden beams and transmit the vertical load of the building from the upper load-bearing wall panel to the lower load-bearing wall panel, allowing the upper and lower load-bearing wall panels to also function as pillars.

According to the second load-bearing wall panel connection structure of the present invention, the first connection member and the second connection member are removably fixed to the first or second fixing plate and the first or second protruding plate. Therefore, when the first connection member and the second connection member undergo plastic deformation and require maintenance such as replacement, only the first connection member and the second connection member can be removed and replaced without removing the load-bearing wall panel or wooden beam from the building, and earthquake resistance can be maintained with relatively simple maintenance work.

According to the third load-bearing wall panel connection structure of the present invention, the first connection member has a rectangular connection plate that abuts against the first fixed plate and the first protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the connection plate in a flat shape perpendicular to the connection plate, and the second connection member has a rectangular connection plate that abuts against the second fixed plate and the second protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the connection plate in a flat shape perpendicular to the connection plate. Therefore, the frame plate can suppress slip deformation of each of the connection plates of the first connection member and the second connection member, and by making the hysteresis curve showing the relationship between the repeated positive and negative loads during an earthquake and the story displacement angle a bilinear type, it is possible to prevent a decrease in the energy absorption capacity of the first connection member and the second connection member.

According to the fourth load-bearing wall panel connection structure of the present invention, the first fixing plate, the second fixing plate, the first protruding plate, the second protruding plate, the first connecting member, and the second connecting member are made of steel having a predetermined fire resistance performance, the load-bearing wall panel is a wooden load-bearing wall panel, and a fire-resistant plate material is arranged between the load-bearing wall panel and the wooden beam, so that the fire-resistant edge can be cut while the load-bearing wall panel is a wooden beam and a wooden load-bearing wall panel.

FIG. 2 is a partially omitted perspective view showing the overall structure of a load-bearing wall panel connection structure. A partially omitted cross-sectional view showing a load-bearing wall panel connection structure in the state where the load-bearing wall panel is cut vertically in the thickness direction. A partially omitted cross-sectional view showing the connection structure of the load-bearing wall panels in the state where the wooden beam is cut on a plane parallel to the load-bearing wall panel. FIG. 4 is a perspective view illustrating the shapes of a first fixing plate and a second fixing plate. FIG. 4 is a perspective view illustrating the shape of a joint member. FIG. 13 is a perspective view illustrating a modified example of the joint member. FIG. 4 is a perspective view illustrating the shapes of a first connecting member and a second connecting member. 6 is a cross-sectional view illustrating a state in which a first connecting member and a second connecting member are attached and detached. FIG. FIG. 4 is an enlarged cross-sectional view illustrating the arrangement of fire-resistant boards. FIG. 2 is an exploded perspective view illustrating the configuration for connecting each part of the load-bearing wall panel connection structure.

The following describes an embodiment of the bearing wall panel connection structure of the present invention with reference to the drawings. In this embodiment, the building in which the bearing wall is formed using the bearing wall panel connection structure 1 is, for example, a wooden detached house, and the structural frame is formed by bridging wooden beams 4 between joint members 3 that connect upper and lower bearing wall panels 2. Note that the building in the present invention is not limited to this embodiment, and may be an apartment building or various non-residential facilities.

As shown in Figures 1 to 3, the load-bearing wall panel connection structure 1 of this embodiment is a structure for connecting load-bearing wall panels 2 arranged side by side on upper and lower floors to each other, and includes load-bearing wall panels 2 for each of the upper and lower floors, a first fixing plate 5 protruding from the lower end of the load-bearing wall panel 2 of the upper floor, a second fixing plate 6 protruding from the upper end of the load-bearing wall panel 2 of the lower floor, a joint member 3 having a first protruding plate 7 protruding from the upper surface and a second protruding plate 8 protruding from the lower surface, a first connecting member 9 connecting the first fixing plate 5 and the first protruding plate 7, and a second connecting member 10 connecting the second fixing plate 6 and the second protruding plate 8.

The load-bearing wall panel 2 is a cross-laminated timber (CLT) that bears horizontal loads applied to the building during earthquakes and the like, and the load-bearing wall panel 2 on the lower floor supports the vertical load of the building transmitted from the load-bearing wall panel 2 on the upper floor and beams joined to the joint members 3. The lower end of the load-bearing wall panel 2 on the lower floor is fixed to and supported by a high-rigidity member such as the concrete foundation or steel beam of the building (not shown). The load-bearing wall panel 2 on the upper floor has a fixing groove 11 formed at its lower end into which the first fixing plate 5 can be inserted, and the load-bearing wall panel 2 on the lower floor has a fixing groove 11 formed at its upper end into which the second fixing plate 6 can be inserted. The fixing groove 11 is formed parallel to the in-plane direction of the load-bearing wall panel 2, is formed in the center of the thickness direction of the load-bearing wall panel 2, and is a slit-shaped groove into which the flat first fixing plate 5 and second fixing plate 6 can be inserted.

The bearing wall panel 2 may be placed inside an exterior wall that separates the interior and exterior of a building, or may be placed inside a wall erected inside a building, such as a parting wall or a partition wall. Note that the bearing wall panel 2 is not limited to cross-laminated timber, and may be made of a wood material with high shear rigidity that can be used as a bearing wall panel 2, such as nail laminated timber (NLT).

As shown in FIG. 4, the first fixing plate 5 and the second fixing plate 6 are thin steel plates formed into an L-shape and have multiple pin holes 12 for fixing to the load-bearing wall panel 2. The first fixing plate 5 and the second fixing plate 6 also have three bolt insertion holes 13 arranged horizontally at the ends protruding from the load-bearing wall panel 2. Specifically, the bolt insertion holes 13 are formed in the lower part of the first fixing plate 5 and the upper part of the second fixing plate 6. The lower edge of the first fixing plate 5 and the upper edge of the second fixing plate 6 are each formed in a horizontal straight line.

As shown in FIG. 10, the first fixing plate 5 is a plate that is fixed to the lower end of the upper floor load-bearing wall panel 2. Although not shown, the first fixing plate 5 is fixed to each of the two corners of the lower end of the load-bearing wall panel 2. The first fixing plate 5 is inserted into a fixing groove 11 formed in the lower end of the load-bearing wall panel 2. As shown in FIG. 2, the first fixing plate is fixed with its lower portion protruding downward from the lower end of the load-bearing wall panel 2 by a fixing device 14 consisting of a fixing pin that penetrates the load-bearing wall panel 2 in the out-of-plane direction, a bolt, and a nut.

The second fixing plate 6 is a plate fixed to the upper end of the lower floor load-bearing wall panel 2. As shown in FIG. 10, the second fixing plate 6 is inserted into a fixing groove 11 formed in the upper end of the load-bearing wall panel 2. As shown in FIG. 2, the second fixing plate 6 is fixed in a state in which its upper part protrudes upward from the upper end of the load-bearing wall panel 2 by a fixing device 14 consisting of a fixing pin penetrating the load-bearing wall panel 2 in the out-of-plane direction, a bolt, and a nut. As described above, the bolt insertion holes 13 are formed in the part of the first fixing plate 5 that protrudes downward from the lower end of the load-bearing wall panel 2, and in the part of the second fixing plate 6 that protrudes upward from the upper end of the load-bearing wall panel 2.

The joint member 3 is made of steel and has a rectangular parallelepiped body 16, a first protruding plate 7 protruding upward from the upper surface of the body 16, a second protruding plate 8 protruding downward from the lower surface of the body 16, and a beam receiving plate 15 protruding horizontally from each of the three side surfaces of the body 16, as shown in FIG. 5. The body 16 is formed so that its vertical length is the same as the beam depth of the wooden beam 4, as shown in FIG. 1 and FIG. 2. The body 16 is also formed so that its length in the direction parallel to the out-of-plane direction of the load-bearing wall panel 2 is the same as the thickness of the load-bearing wall panel 2, and as shown in FIG. 3, its length in the direction parallel to the in-plane direction of the load-bearing wall panel 2 is equal to the length of the first connecting member 9 and the second connecting member 10. The first protruding plate 7 extends vertically from the upper surface of the body 16 and has three bolt receiving holes 17. The upper edge of the first protruding plate 7 is formed in a horizontal straight line and is butted against the lower edge of the first fixing plate 5. The second protruding plate 8 extends vertically from the bottom surface of the main body 16 and has three bolt receiving holes 17. The lower edge of the second protruding plate 8 is formed in a horizontal straight line and is butted against the upper edge of the second fixed plate 6. The first fixed plate 5, the second fixed plate 6, the first protruding plate 7, and the second protruding plate 8 are flat plates parallel to the in-plane direction of the load-bearing wall panel 2 and are disposed in the center of the load-bearing wall panel 2 in the thickness direction.

The beam support plate 15 is a plate that is formed to protrude from two or more of the four horizontal sides of the main body 16 and receives the end of the wooden beam 4. The beam support plate 15 is formed by two plates protruding in parallel from the side of the main body 16. The beam support plate 15 has three beam receiving holes 18 arranged vertically. Two slits 20 are formed at each end of the wooden beam 4 so that the beam support plate 15 can be inserted. In addition, three pin fixing holes 19 are provided so as to penetrate the end of the wooden beam 4 horizontally. As shown in Figures 1, 5, and 10, in this embodiment, the beam support plate 15 is formed to protrude from each of the three side surfaces of the main body 16, and the beam support plate 15 is inserted into each of the slits 20 of the wooden beam 4, and the drift pins 28 inserted into the pin fixing holes 19 that penetrate the end of the wooden beam 4 are inserted into the beam receiving holes 18 of the beam support plate 15, so that the joint member 3 receives the end of the wooden beam 4.

The beam support plate 15 of the present invention is not limited to protruding from three sides of the main body 16. For example, when the wooden beams 4 are arranged in a cross shape in a plan view, they may protrude from each of the four sides of the main body 16. Alternatively, as shown in FIG. 6, the beam support plate 15 may protrude from two sides of the main body 16 in directions that are separated from each other. Also, the beam support plate 15 may protrude from two sides of the main body 16 that are perpendicular to each other.

By configuring the beam support plate 15 formed on the joint member 3 to support the wooden beam 4, the first connecting member 9 and the second connecting member 10 do not come into contact with the wooden beam 4, and the horizontal force applied to the load-bearing wall panel 2 of the upper floor during an earthquake, for example, is transmitted to the load-bearing wall panel 2 of the lower floor via the first connecting member 9, the joint member 3, and the second connecting member 10, thereby suppressing damage to the wooden beam 4.

As shown in FIG. 7, the first connecting member 9 and the second connecting member 10 have a rectangular connecting plate 21 that abuts against the first fixing plate 5 or the second fixing plate 6, and the first protruding plate 7 or the second protruding plate 8, and is joined to each plate with high-strength bolts 24 and nuts 25, and a frame plate 22 formed on the periphery of the connecting plate 21 in a flat shape perpendicular to the connecting plate 21, and are formed in a box shape that is open toward the outside of the plane of the load-bearing wall panel 2.

As shown in Fig. 3 and Fig. 10, the first connection member 9 has six connection holes 23 formed in the connection plate 21. The connection holes 23 are formed in two rows, one above the other, with three holes in each row in the horizontal direction, with the upper three connection holes 23 aligned with the bolt insertion holes 13 of the first fixing plate 5, and the lower three connection holes 23 aligned with the bolt receiving holes 17 of the first protruding plate 7. As shown in Fig. 2, the first connection member 9 has the connection plate 21 abutting the front and back surfaces of the first fixing plate 5 and the first protruding plate 7, respectively, and the first fixing plate 5 and the first protruding plate 7 are joined by inserting high-strength bolts 24 into the upper connection holes 23 and the bolt insertion holes 13, respectively, and tightening them with nuts 25, and by inserting high-strength bolts 24 into the lower connection holes 23 and the bolt receiving holes 17, respectively, and tightening them with nuts 25.

The second connection member 10 has six joining holes 23 formed in the joining plate 21, similar to the first connection member 9. As shown in FIG. 2, the second connection member 10 has the joining plate 21 abutting the front and back surfaces of the second fixing plate 6 and the second protruding plate 8, respectively, and joins the second fixing plate 6 and the second protruding plate by inserting high-strength bolts 24 into the upper joining holes 23 and bolt receiving holes 17 and tightening them with nuts 25, and by inserting high-strength bolts 24 into the lower joining holes 23 and bolt insertion holes 13 and tightening them with nuts 25.

The horizontal force applied to the building is converted into vertical tension and compression forces at the lower corners of the upper bearing wall panel 2, but as described above, the first protruding plate 7 and the second protruding plate 8 are connected by the joint member 3, so that the tension and compression forces are transmitted to the lower bearing wall panel 2 without passing through the wooden beam 4, so no large load is placed on the wooden beam 4, and damage to the wooden beam 4 can be prevented.

The first connecting member 9 and the second connecting member 10 are made of steel and are formed to have a lower rigidity than the load-bearing wall panel 2, and are formed so that the first connecting member 9 and the second connecting member 10 can absorb the horizontal force transmitted from the load-bearing wall panel 2 by plastically deforming. The first connecting member 9 and the second connecting member 10 have a rectangular joint plate 21 and a frame plate 22 formed on the periphery of the joint plate 21, so that the slip deformation of the joint plate 21 is suppressed by the frame plate 22, and the hysteresis curve showing the relationship between the repeated positive and negative loads during an earthquake and the story displacement angle can be made bilinear, and a decrease in the energy absorption capacity of the first connecting member 9 and the second connecting member 10 can be prevented.

As shown in FIG. 8, the first and second connecting members 9 and 10 can be removed from the structural body without interfering with the wooden beam 4 or the load-bearing wall panel 2 by removing the high-strength bolts 24 and nuts 25 and pulling them outward from the plane of the load-bearing wall panel 2. Therefore, even if the first and second connecting members 9 and 10 are plastically deformed due to an earthquake or the like and require maintenance such as replacement, only the deformed connecting members 9 and 10 can be removed and replaced without removing the load-bearing wall panel 2 or the wooden beam 4 from the building, and earthquake resistance can be maintained with relatively simple maintenance work.

The first fixing plate 5, the second fixing plate 6, the first protruding plate 7, the second protruding plate 8, the first connecting member 9, the second connecting member 10, and the joint member 3 are made of steel having a higher fire resistance than the wooden beam 4 and the load-bearing wall panel 2. Here, the "predetermined fire resistance" in the present invention means a fire resistance that meets the requirements of the law in this embodiment, for example, a fire spread suppression performance for one hour. The first connecting member 9 is arranged between the load-bearing wall panel 2 of the upper floor and the wooden beam 4, and the second connecting member 10 is arranged between the load-bearing wall panel 2 of the lower floor and the wooden beam 4, and a gap is formed between the load-bearing wall panel 2 and the wooden beam 4. And, as shown in FIG. 9, the position where the first connecting member 9 is arranged is cut out between the load-bearing wall panel 2 of the upper floor and the wooden beam 4 to form a floor material 26 made of fire-resistant plate material, and the position where the second connecting member 10 is arranged is cut out between the load-bearing wall panel 2 of the upper floor and the wooden beam 4 to form a ceiling material 27 made of fire-resistant plate material. In addition, fireproof covering materials (not shown) are arranged between these fireproof plates and the first connecting member 9 and the second connecting member 10. In this way, the wooden beams 4 and the wooden load-bearing wall panels 2 are not directly connected, and fireproof edges can be cut off while still using a structure that uses the wooden beams 4 and the wooden load-bearing wall panels 2, and a fireproof line can be provided between the upper and lower floors.

It goes without saying that the embodiment of the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate without departing from the scope of the concept of the present invention.

<First feature>
The first load-bearing wall panel connection structure of this embodiment includes load-bearing wall panels formed in a rectangular flat plate shape and arranged side by side on upper and lower floors to bear the horizontal load of a building, a first fixing plate formed protruding from the lower end of the load-bearing wall panel of the upper floor, a second fixing plate formed protruding from the upper end of the load-bearing wall panel of the lower floor, a joint member formed in a rectangular parallelepiped shape with a first protruding plate protruding from the upper surface and a second protruding plate protruding from the lower surface, and a joint member fixed to the first fixing plate and the first protruding plate from the out-of-plane direction of the load-bearing wall panel to connect the first fixing plate and the first protruding plate. The joint member comprises a first connecting member and a second connecting member fixed to the second fixed plate and the second protruding plate from the out-of-plane direction of the load-bearing wall panel and connecting the second fixed plate and the second protruding plate, wherein the first connecting member and the second connecting member are plastically deformable by a horizontal force transmitted from the load-bearing wall panel, and the joint member has a beam support plate formed by protruding horizontally from two or more side surfaces, and the beam support plate is inserted into a slit provided at the end of a wooden beam and supports the end of the beam by having a drift pin penetrating the wooden beam intersect at a right angle.

Due to this feature, the horizontal force of the building concentrated at the joints of the load-bearing wall panels can be absorbed by the plastic deformation of the first and second connection members, resulting in a building with high resilience against earthquake loads. Furthermore, the vertical load of the building applied to the load-bearing wall panels on the upper floor and horizontal loads such as earthquakes can be transmitted to the load-bearing wall panels on the lower floor by the joint members without going through the wooden beams, so that large loads are not applied to the wooden beams and damage to the wooden beams can be suppressed. Furthermore, the joint members not only serve to connect the upper and lower load-bearing wall panels, but also serve to support the ends of the wooden beams. The joint members receive the ends of the wooden beams and transmit the vertical load of the building from the upper load-bearing wall panel to the lower load-bearing wall panel, allowing the upper and lower load-bearing wall panels to also serve as pillars.

<Second feature>
The second load-bearing wall panel connection structure of this embodiment is characterized in that, in addition to the first feature described above, the first connecting member and the second connecting member are detachably fixed to the first fixing plate or the second fixing plate, and the first protruding plate or the second protruding plate.

Due to this feature, when the first and second connecting members undergo plastic deformation and require maintenance such as replacement, only the first and second connecting members can be removed and replaced without removing the load-bearing wall panels or wooden beams from the building, allowing earthquake resistance to be maintained with relatively simple maintenance work.

<Third feature>
The third load-bearing wall panel connection structure of this embodiment is characterized in that, in addition to the second feature described above, the first connection member has a rectangular connecting plate that abuts against the first fixed plate and the first protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the connecting plate in a flat shape perpendicular to the connecting plate, and the second connection member has a rectangular connecting plate that abuts against the second fixed plate and the second protruding plate and is joined to each plate with bolts and nuts, and a frame plate formed on the periphery of the connecting plate in a flat shape perpendicular to the connecting plate.

Due to this feature, the frame plate suppresses slip deformation of the respective joint plates of the first and second connecting members, and by making the hysteresis curve showing the relationship between the repeated positive and negative loads during an earthquake and the story displacement angle a bilinear type, it is possible to prevent a decrease in the energy absorption capacity of the first and second connecting members. In other words, the first and second connecting members, once deformed by the repeated positive and negative horizontal loads during an earthquake, tend to return to their original shape when subjected to a horizontal load in the opposite direction due to the presence of the frame plate, so a decrease in the ability to absorb horizontal forces can be suppressed.

<Fourth feature>
The fourth load-bearing wall panel connection structure of this embodiment is characterized in that, in addition to the third feature described above, the first fixing plate, the second fixing plate, the first protruding plate, the second protruding plate, the first connecting member, and the second connecting member are made of steel having a predetermined fire resistance performance, the load-bearing wall panel is a wooden load-bearing wall panel, and a fire-resistant plate material is arranged between the load-bearing wall panel and the wooden beam.

This feature makes it possible to cut fire resistance at the ceiling and floor levels, even in buildings made of wooden beams and wooden load-bearing wall panels, which are relatively susceptible to fire spreading.

The load-bearing wall panel connection structure of the present invention is suitable, for example, as a structure for installing load-bearing wall panels in a wooden house.

REFERENCE SIGNS LIST 1 load-bearing wall panel connection structure 2 load-bearing wall panel 3 joint member 4 wooden beam 5 first fixing plate 6 second fixing plate 7 first protruding plate 8 second protruding plate 9 first connecting member 10 second connecting member 15 beam support plate 21 joint plate 22 frame plate 24 high-strength bolt (bolt)
25 Nut 26 Flooring material (fireproof board material)
27 Ceiling material (fireproof board material)

Claims (4)

A load-bearing wall panel formed in a rectangular flat plate shape and arranged side by side on upper and lower floors to bear the horizontal load of the building;
A first fixing plate formed by protruding from a lower end of the load-bearing wall panel of the upper floor;
A second fixing plate formed protruding from the upper end of the load-bearing wall panel of the lower floor;
a joint member formed in a rectangular parallelepiped shape, with a first protruding plate protruding from an upper surface and a second protruding plate protruding from a lower surface;
A first connection member that is fixed to the first fixing plate and the first protruding plate from an outer surface direction of the bearing wall panel and connects the first fixing plate and the first protruding plate;
a second connection member fixed to the second fixing plate and the second protruding plate from an out-of-plane direction of the load-bearing wall panel, the second fixing plate and the second protruding plate being connected to each other;
The first connection member and the second connection member are plastically deformable by a horizontal force transmitted from the load-bearing wall panel,
The joint member has a beam support plate formed by protruding horizontally from two or more sides, and the beam support plate is inserted into a slit provided at the end of the wooden beam, and a drift pin penetrating the wooden beam is perpendicular to the slit to support the end of the wooden beam. The load-bearing wall panel connection structure according to claim 1, characterized in that the first connection member and the second connection member are removably fixed to the first fixing plate or the second fixing plate, and the first protruding plate or the second protruding plate. The first connection member includes a rectangular joining plate that abuts against the first fixed plate and the first protruding plate and is joined to each plate with a bolt and a nut, and a frame plate that is formed on a periphery of the joining plate and has a flat shape perpendicular to the joining plate,
The second connecting member is a rectangular connecting plate that abuts against the second fixing plate and the second protruding plate and is joined to each plate with a bolt and a nut, and a frame plate formed in a flat shape perpendicular to the connecting plate on the periphery of the connecting plate. the first fixing plate, the second fixing plate, the first protruding plate, the second protruding plate, the first connecting member, and the second connecting member are made of steel having a predetermined fire resistance performance;
The load-bearing wall panel is a wooden load-bearing wall panel,
4. The structure for connecting load-bearing wall panels according to claim 3, further comprising a fireproof plate disposed between the load-bearing wall panel and the wooden beam.

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