JP2020139269A - Bearing wall and wall material - Google Patents

Abstract

To provide a bearing wall capable of reducing the weight while ensuring the bearing capacity from the beginning to the end of an earthquake.SOLUTION: The bearing wall includes: a pair of vertical materials each extending in the vertical direction; and wall materials each joined to the pair of vertical materials respectively including a plurality of openings each having an annular rib on the edge arranged in a row with an interval in the vertical direction. The shape of the opening is a polygonal shape having an even number of corners. The wall materials includes the plurality of openings which are formed symmetrically with respect to a straight line extending in the vertical direction so that the vertices of the opposite corners of the opening are located on the straight line.SELECTED DRAWING: Figure 3

Description

The present invention relates to bearing walls and wall materials.

Patent Document 1 includes a pair of vertical members joined to horizontal members above and below an object, and a wall material joined to a pair of vertical members and having a plurality of burring holes formed in a row vertically. The wall is disclosed. In this bearing wall, the shape of the burring hole formed in the wall surface material is circular.

Japanese Patent No. 5805893

By the way, a plurality of through holes may be formed in the wall material of the bearing wall for piping and wiring. The through hole is often circular in consideration of the proof stress of the wall surface material and the like. However, in the market, it is desired to develop a bearing wall that has substantially the same bearing capacity from the beginning to the end of an earthquake and can be made lighter than a bearing wall having a circular through hole.

In consideration of the above facts, it is an object of the present invention to provide a bearing wall and a wall material that can reduce the weight while ensuring the bearing capacity from the beginning to the end of an earthquake.

The bearing wall of the first aspect of the present invention is joined to a pair of vertical members extending in the vertical direction and a pair of the vertical members, respectively, and openings provided with annular ribs at the edges are spaced apart in the vertical direction. The wall material is provided with a single row of wall materials, and the shape of the opening is a polygonal shape having an even number of corners, and the wall material is symmetrical with respect to a straight line extending in the vertical direction. Moreover, the opening is formed so that the vertices of the corners facing each other of the opening are located on the straight line.

In the bearing wall of the first aspect, since the shape of the opening formed in the wall surface material is a polygonal shape having an even number of corners, the size of the inscribed circle in the polygonal opening is set to that of the circular opening. By making the size larger than the size, the opening area for the wall surface material can be made larger than that of the circular opening. As a result, the weight of the bearing wall can be reduced.
Further, in the bearing wall, the polygonal opening is formed on the wall surface material so as to be symmetrical with respect to a straight line extending in the vertical direction and the vertices of the corner portions facing each other are located on the straight line. Therefore, the bearing wall can secure the bearing capacity from the initial stage to the final stage of the earthquake to substantially the same level as the bearing wall having the wall surface material having the circular opening formed therein.

The bearing wall of the second aspect of the present invention has the same size of the adjacent openings in the bearing wall of the first aspect.

In the bearing wall of the second aspect, since the sizes of the adjacent openings are the same, for example, the stress acting on each opening is constant as compared with the configuration in which the sizes of the adjacent openings are different. Therefore, it is easy to secure the bearing capacity from the beginning to the end of the earthquake. It also facilitates the manufacture of wall materials.

The bearing wall of the third aspect of the present invention is the bearing wall of the first or second aspect, and the opening is a square shape in which the vertices of the corners are arranged on the straight line.

In the bearing wall of the third aspect, since the shape of the opening is a square shape in which the vertices of the corners are arranged on a straight line extending in the vertical direction, the size of the inscribed circle is the most among the regular polygonal shapes having the same size. Since the opening area can be increased, the weight can be further reduced.

In the bearing wall of the fourth aspect of the present invention, in any one of the first to third aspects, the distance between the centers of the openings adjacent to each other in the vertical direction is the pair of the vertical member and the wall surface member. Shorter than the horizontal distance between the junctions of.

In the bearing wall of the fourth aspect, in the wall surface material, the distance between the centers of the openings adjacent in the vertical direction is shorter than the horizontal distance between the joint points between the pair of vertical members and the wall surface material. Therefore, when the horizontal load due to the earthquake is transmitted to the bearing wall due to the earthquake, in the wall material, the joint portion between one vertical member and the wall material and the horizontal intermediate portion between the opening and the other The shear stress (Mieses stress) value in the horizontal intermediate part between the joint between the vertical member and the wall surface material and the opening is lower than the shear stress value in the vertical intermediate part between the vertically adjacent openings. .. As a result, the horizontal shear stress generated in the pair of vertical members is reduced. As a result, deformation of the joint between the wall surface material and the vertical material is suppressed before the vertical intermediate portion between the vertically adjacent openings in the wall surface material is deformed, and seismic energy is stably absorbed. It becomes possible to do.

The wall surface material of the fifth aspect of the present invention is a wall surface material that is joined to a pair of vertical members extending in the vertical direction, and is formed at intervals in the vertical direction and has a polygonal shape having an even number of corners. The apex of the corner portion of the opening and the annular rib provided at the edge of the opening, which is symmetrical with respect to the straight line extending in the vertical direction and faces the opening on the straight line. They are located together.

In the wall surface material of the fifth aspect, since the shape of the opening is a polygonal shape having an even number of corners, the size of the inscribed circle in the polygonal opening should be equal to or larger than the size of the circular opening. Therefore, the opening area for the wall surface material can be made larger than that of the circular opening. As a result, the weight of the wall surface material can be reduced.
Further, in the wall surface material, the polygonal opening is formed so as to be symmetrical with respect to a straight line extending in the vertical direction and the vertices of the corner portions facing the straight line are located. Therefore, the wall material can secure the yield strength from the initial stage to the final stage of the earthquake to substantially the same level as the wall material having a circular opening.

According to the present invention, it is possible to provide a bearing wall and a wall material that can reduce the weight while ensuring the bearing capacity from the initial stage to the final stage of an earthquake.

It is a front view of the bearing wall of one Embodiment of this invention. It is a front view of the frame material of the bearing wall shown in FIG. It is an enlarged view of the part pointed out by the arrow 3X of FIG. It is an enlarged view of the part corresponding to FIG. 3 which shows the force acting on each part of the bearing wall shown in FIG. 1 at the end of an earthquake by arrow. It is sectional drawing of the bearing wall cut along the 5X-5X line of FIG. It is sectional drawing of the bearing wall cut along the line 6X-6X of FIG. It is an enlarged view around the opening of the bearing wall of another embodiment of this invention. It is an enlarged view around the opening of the bearing wall of another embodiment of this invention. It is an enlarged view around the opening of the bearing wall of Comparative Example 1. It is an enlarged view around the opening of the bearing wall of Comparative Example 2. It is an enlarged view around the opening of the bearing wall of Comparative Example 3. It is an enlarged view around the opening of the bearing wall of Comparative Example 4. It is an enlarged view around the opening of the bearing wall of Comparative Example 5. It is a graph which shows the characteristic of the change of the horizontal load with respect to the interlayer change angle of a bearing wall.

The bearing wall and the wall surface material according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6. The arrow U shown in the figure indicates the upward direction of the building to which the bearing wall of the present embodiment is applied. Further, the arrow W shown in the figure indicates the width direction of the bearing wall. In this embodiment, the width direction of the bearing wall and the horizontal direction of the building coincide with each other.

As shown in FIG. 1, the bearing wall 20 of the present embodiment includes a frame member 22 and a wall surface member 50.

As shown in FIGS. 1 and 2, the frame member 22 is formed in a rectangular shape. The frame members 22 are arranged at intervals in the horizontal direction, and the vertical frame members 24, 26, 28 extending in the vertical direction and the horizontal frame members 24, 26, 28 are connected to the upper ends of the vertical frame members 24, 26, 28 in the horizontal direction. 30 and a horizontal frame member 32 that connects the lower ends of the vertical frame members 24, 26, and 28 in the horizontal direction are provided.

The vertical frame members 24, 26, and 28 of the present embodiment are examples of the vertical frame members in the present invention.

(Vertical frame material 24)
As shown in FIG. 2, the vertical frame member 24 forms a portion of the frame member 22 on one side (left side in FIGS. 2 and 5) in the width direction (arrow W direction in the drawing). In this embodiment, the width direction of the frame member 22 and the width direction of the bearing wall 20 are the same.

As shown in FIGS. 5 and 6, the vertical frame member 24 forms a square steel pipe 34 forming an outer frame portion on the outer side in the width direction and an inner frame portion on the inner side in the width direction, and forms the vertical frame member 26 side ( In other words, the frame member 22 is provided with a C-shaped shaped steel 36 having an open cross section on the other side in the width direction (right side in FIGS. 2 and 5).

The square steel pipe 34 has a square cross section, and two square steel pipes 34 are arranged side by side in the thickness direction of the frame member 22 (in the direction of arrow T in the drawing). These square steel pipes 34 are joined by welding.

The shaped steel 36 is a lip channel steel, and the outer surface of the web portion 36A is joined to the inner surface of the frame (inside the frame member 22) of the square steel pipe 34. Specifically, the shaped steel 36 is joined to two square steel pipes 34 by using a drill screw 38. The present invention is not limited to the above configuration, and the shaped steel 36 and the square steel pipe 34 may be joined by using another method such as welding. Further, a reinforcing member 40 having a C-shaped cross section is joined to the inner surface of the shaped steel 36. The reinforcing member 40 is channel steel, and the outer surface of the web portion 40A and the outer surface of both flange portions 40B are joined to the inner surface of the web portion 36A of the shaped steel 36 and the inner surface of both flange portions 36B, respectively. The method of joining the shaped steel 36 and the reinforcing member 40 is not particularly limited. For example, the shaped steel 36 and the reinforcing member 40 may be joined by welding.

(Vertical frame material 26)
As shown in FIG. 2, the vertical frame member 26 is arranged between the vertical frame member 24 and the vertical frame member 28, and forms a portion located at the central portion in the width direction of the frame member 22.

As shown in FIGS. 5 and 6, the vertical frame member 26 has a C-shaped cross section with the vertical frame member 28 side (in other words, the other side in the width direction of the frame member 22) open. , Is equipped.

(Vertical frame material 28)
As shown in FIG. 2, the vertical frame member 28 forms a portion of the frame member 22 on the other side in the width direction (right side in FIGS. 2 and 5).

As shown in FIGS. 5 and 6, the vertical frame member 28 is configured symmetrically with the vertical frame member 24 with the vertical frame member 26 interposed therebetween. Specifically, the vertical frame member 28 forms the square steel pipe 34 forming the outer frame portion and the inner frame portion, and forms the vertical frame member 26 side (in other words, one side in the width direction of the frame member 22 (FIG. 2 and). In FIG. 5, the left side)) is provided with the open shaped steel 36 and the reinforcing member 40 for reinforcing the shaped steel 36.

As shown in FIG. 2, the horizontal frame member 30 is formed of a square steel pipe having a rectangular cross section. The upper ends of the vertical frame members 24, 26, and 28 are joined to the horizontal frame member 30 by fasteners such as screws and bolts, welding, or the like.

As shown in FIG. 2, the horizontal frame member 32 is formed of a square steel pipe having a rectangular cross section, similarly to the horizontal frame member 30. The lower ends of the vertical frame members 24, 26, and 28 are joined to the horizontal frame member 30 by fasteners such as screws and bolts, welding, or the like.

As shown in FIG. 2, the frame member 22 includes stiffening members 44 and 46 for reinforcing the rigidity of the horizontal frame member 30 and the horizontal frame member 32 with respect to the relative displacement in the horizontal direction. The stiffening member 44 is arranged between the vertical frame member 24 and the vertical frame member 26 and at a substantially central portion in the vertical direction. Further, one end of the stiffening member 44 is joined to the vertical frame member 24 with a drill screw 48, and the other end is joined to the vertical frame member 26 with a drill screw 48. On the other hand, the stiffening member 46 is arranged between the vertical frame member 24 and the vertical frame member 26 and at a substantially central portion in the vertical direction. Further, one end of the stiffening member 46 is joined to the vertical frame member 26 together with the other end of the stiffening member 44 by a drill screw 48, and the other end is joined to the vertical frame member 28 by a drill screw 48. If the rigidity of the frame member 22 is ensured, the stiffening members 44 and 46 may be omitted.

(Wall material 50)
As shown in FIG. 1, the wall surface material 50 is a steel plate formed in a rectangular shape and is joined to the frame material 22. In the bearing wall 20 of the present embodiment, two wall material 50s are used, one wall material 50 is joined to the vertical frame material 24 and the vertical frame material 26, and the other wall material 50 is vertically connected to the vertical frame material 26. It is joined to the frame material 28. Specifically, both ends of one wall surface member 50 in the width direction are joined to the vertical frame member 24 and the vertical frame member 26, which are a pair of vertical members, by using a plurality of drill screws 52, respectively. Further, both ends of the other wall surface material 50 in the width direction are joined to the vertical frame member 26 and the vertical frame member 28, which are a pair of vertical members, by using a plurality of drill screws 52, respectively. Although the two wall surface materials 50 have the same dimensions, the present invention is not limited to this configuration and may have different dimensions.

The portion where the drill screw 52 is screwed in for joining the one wall surface material 50, the vertical frame material 24, and the vertical frame material 26, and the other wall surface material 50, the vertical frame material 26, and the vertical frame material 28. The portion where the drill screw 52 is screwed in for joining is referred to as a joint portion 60.

Further, as shown in FIGS. 1 and 3, a plurality of joint portions 60 are formed at intervals in the vertical direction. In the wall surface material 50 of the present embodiment, the joint portions 60 are provided at substantially constant intervals, but the present invention is not limited to this configuration. For example, the joints may be densely arranged in a region where a large shear force acts when a horizontal load is applied to the bearing wall so that the shear forces acting on the adjacent joints in the vertical direction are uniformly approached.

Further, as shown in FIG. 3, the wall surface material 50 is formed with a plurality of openings 54 (seven in the present embodiment) at intervals in the vertical direction. These seven openings 54 are formed so as to form a row in the vertical direction. The openings 54 arranged in a row are offset from the center of the wall surface material 50 in the width direction. In other words, the straight line SL extending in the vertical direction through the center of the opening 54 adjacent in the vertical direction is closer to one side or the other side in the width direction (in FIG. 3, the straight line SL is closer to the right side). ..

As shown in FIG. 3, the opening 54 has a polygonal shape having an even number of corners (corners) 54A. The "polygon shape" referred to here includes a polygon whose corners are angular and a polygon whose corners are curved (rounded) in an arc shape. The opening 54 is formed in the wall surface material 50 so as to be symmetrical with respect to the straight line SL and so that the vertices 54AEs of the corner portions 54A facing each other of the opening 54 are located on the straight line SL. In the present embodiment, the shape of the opening 54 is a square shape in which the apex 54AE of the corner portion 54A is arranged on the straight line SL.

Further, in the present embodiment, the sizes of the openings 54 adjacent to each other in the vertical direction are the same. The size of the polygonal opening 54 is preferably set so that the diameter of the inscribed circle C is 200 mm or more.

Further, as shown in FIGS. 5 and 6, an annular rib 56 integrally formed with the wall surface material 50 is formed at the edge of the opening 54. In the present embodiment, the steel plate to be the wall surface material 50 is subjected to burring processing to form the opening 54 and the annular rib 56. The present invention is not limited to the above configuration. For example, an opening is formed in a steel plate serving as a wall surface material 50 by press working, and a polygonal annular member (cylindrical member) is joined to the edge of the opening. The opening 54 and the annular rib 56 may be formed.

Further, the center-to-center distance D1 of the openings 54 adjacent in the vertical direction is shorter than the horizontal distance D2 between the joint portion 60 of the vertical frame member 24 and the joint portion 60 of the vertical frame member 26.

As shown in FIG. 1, the upper end portion of one wall surface material 50 and the upper end portion of the other wall surface material 50 are joined to the horizontal frame member 30 by using a plurality of drill screws 52, respectively. Then, the lower end portion of one wall surface material 50 and the lower end portion of the other wall surface material 50 are joined to the horizontal frame member 32 by using a plurality of drill screws 52, respectively.

(Action and effect of this embodiment)
Conventionally, a plurality of openings may be formed in a wall material of a bearing wall for piping or wiring. These openings are often circular in consideration of the proof stress of the wall surface material and the like. However, in the market, it is desired to develop a bearing wall that has almost the same bearing capacity from the beginning to the end of an earthquake and can be made lighter than a bearing wall having a wall material having a circular opening. There is. In consideration of these, the present inventors have reached the development of the present invention.

Hereinafter, the actions and effects of the present embodiment will be described while comparing the bearing wall 20 of the present embodiment with the bearing wall of the comparative example. First, the bearing wall of each comparative example will be described. As shown in FIG. 9, the bearing wall 100 of the comparative example is a bearing wall in which a circular opening 104 is formed in the wall surface material 102. Further, in the bearing wall 110 of the comparative example, as shown in FIG. 10, a square opening 114 is formed in the wall surface material 112, but the opposite corners 114A of the opening 114 are located on the straight line SL. It is a bearing wall that is not. Further, in the bearing wall 120 of the comparative example, as shown in FIG. 11, a regular hexagonal opening 124 is formed in the wall surface material 132, but the opposite corner 124A of the opening 124 is located on the straight line SL. It is a bearing wall that is not. As shown in FIG. 12, the load-bearing wall 130 of the comparative example is a load-bearing wall in which an elliptical opening 134 is formed in the wall surface material 132, and the short axis of the opening 134 coincides with the straight line SL. is there. As shown in FIG. 13, the bearing wall 134 of the comparative example is a bearing wall in which an elliptical opening 144 is formed in the wall surface material 142, and the long axis of the opening 144 coincides with the straight line SL. is there.
The bearing wall of each comparative example has the same configuration as the bearing wall 20 of the present embodiment except for the shape of the opening and the orientation of the opposite corners.

In the bearing wall 20 of the present embodiment, the shape of the opening 54 formed in the wall surface material 50 is a polygonal shape having an even number of corner portions 54A. Here, the size of the inscribed circle of the polygonal opening 54 (the inscribed circle C shown by the two-point chain line in FIG. 3) is set to be larger than the size of the opening 104 of the bearing wall 100 of the comparative example. By doing so, the opening area with respect to the wall surface material 84 can be made larger than that of the circular opening 104. In this way, the bearing wall 20 can be made lighter than the bearing wall 100 of the comparative example. Further, since the opening area of the opening 54 becomes large, it becomes possible to further pass piping and wiring through the increased portion.

Further, in the bearing wall 20, since the shape of the opening 54 is a square shape in which the apex 54AE of the corner portion 54A is arranged on the straight line SL, the size of the inscribed circle C is the largest among the regular polygonal shapes having the same size. The opening area can be increased. Therefore, the bearing wall 20 can be further reduced in weight as compared with the bearing wall 100 of the comparative example.

Further, in the bearing wall 20, the polygonal opening 54 is formed in the wall surface material 50 so that the vertices 54AEs of the corner portions 54A that are symmetrical with respect to the straight line SL and face each other on the straight line SL are located. As a result, the bearing wall 20 can secure the bearing capacity from the beginning to the end of the earthquake to substantially the same level as the bearing wall 100 of the comparative example. Specifically, in the bearing wall 20, shear stress is concentrated between the openings 54 adjacent in the vertical direction of the wall surface material 50 in the initial stage of the earthquake (for example, when the interlayer deformation angle is 1/300). The mechanism by which this shear stress is concentrated is common to all comparative examples. On the other hand, regarding the compression resistance of the opening, the bearing wall 20 of the present embodiment and the bearing wall 100 of the comparative example are higher than the bearing wall of the other comparative example. In the bearing wall 100 of the comparative example, since the opening 104 is circular, it is presumed that shear stress is difficult to concentrate and the compressive resistance CR is high. On the other hand, it is presumed that the bearing wall 20 of the present embodiment has a higher compression resistance CR than the bearing wall 110 of the comparative example because the apex 54AE of the corner portion 54A is located on the straight line SL. From the above, the bearing wall 20 can secure a bearing capacity substantially equal to that of the bearing wall 100 of the comparative example at the initial stage of the earthquake.
Further, in the bearing wall 20, at the final stage of the earthquake (for example, when the interlayer deformation angle is 1/100 o'clock), as shown in FIG. 4, the wall material 50 is diagonally connected between the openings 54 adjacent to each other in the vertical direction. A tensile force TS is generated in the direction, and the balance between the compressive resistance CR of the opening 54 and the shearing force SF acting on each joint 60 is maintained. Similarly, the bearing wall 100 of the comparative example also maintains a balance of forces. On the other hand, in the bearing walls 110, 120, 130, 140 of the comparative example, since the compression resistance of the opening is lower than that of the bearing wall 20 of the present embodiment, it is difficult to maintain the balance of the forces. That is, it is presumed that the magnitude of the compressive resistance of the opening affects the bearing capacity of the bearing wall from the beginning to the end of the earthquake. Therefore, the bearing wall 20 can secure a yield strength substantially equal to that of the bearing wall 100 of the comparative example from the beginning to the end of the earthquake. It will be described later that the bearing wall from the initial stage to the final stage of the earthquake is substantially the same as the bearing wall 20 of the present embodiment and the bearing wall 100 of the comparative example.

Further, in the bearing wall 20, since the sizes of the openings 54 adjacent to each other in the vertical direction are the same, for example, as compared with the configuration in which the sizes of the adjacent openings 54 are different, each opening 54 has a different size. The acting stress can be made constant. Therefore, the bearing wall 20 can easily secure the bearing capacity from the beginning to the end of the earthquake. Further, the wall material 50 can be easily manufactured.

Since the center-to-center distance D1 of the bearing wall 20 is shorter than the horizontal distance D2, when the horizontal load due to the earthquake is transmitted to the bearing wall 20, the joint portion 60 and the opening are formed in the wall material 50. The shear stress value (mises stress) in the horizontal intermediate portion with the 54 can be made lower than the shear stress value in the vertical intermediate portion between the openings 54 adjacent in the vertical direction. As a result, the shear stress in the horizontal direction generated in the pair of vertical members (vertical frame member 24 and vertical frame member 26, or vertical frame member 26 and vertical frame member 28) is reduced. As a result, the joint portion 60 between the wall surface material 50 and the pair of vertical members is suppressed from being deformed before the vertical intermediate portion between the openings 54 adjacent to each other in the vertical direction is deformed in the wall surface material 50, resulting in an earthquake. It is possible to absorb energy in a stable manner.

In the bearing wall 20 of the above-described embodiment, the drill screw 52 is used for joining the frame material 22 and the wall surface material 50, but the present invention is not limited to this configuration. For example, a nail may be used instead of the drill screw 52. Further, the frame material 22 and the wall surface material 50 may be joined by spot welding. When spot welding is used, the welded portion of the frame material 22 and the wall surface material 50 is referred to as a joint portion.

In the bearing wall 20 of the above-described embodiment, the wall surface material 50 is not formed with a pilot hole, but the present invention is not limited to this configuration, and the wall surface material 50 may be formed with a pilot hole or a mark for drilling. Good.

In the bearing wall 20 of the above-described embodiment, the shape of the opening 54 is a square shape in which the apex 54AE of the corner portion 54A is arranged on the straight line SL, but the present invention is not limited to this configuration. For example, as in the bearing wall 70 shown in FIG. 7, the shape of the opening 74 formed in the wall surface member 72 may be a regular hexagonal shape in which the apex 74AE of the corner portion 74A facing the shape is arranged on the straight line SL. That is, the shape of the opening of the bearing wall according to the embodiment of the present invention may be a regular polygonal shape such as a regular octagonal shape as long as the vertices of the opposing corners are arranged on the straight line SL.

The bearing wall 20 of the above-described embodiment is configured by joining the wall surface material 50 to the frame member 22, but the present invention is not limited to this configuration. For example, like the bearing wall 80 shown in FIG. 8, a pair of vertical members extending in the vertical direction, the upper ends of which are connected to the horizontal member HM1 of the building, and the lower ends of each are connected to the horizontal member HM2 of the building. The wall surface material 84 may be joined to the 82 using a drill screw 52. The wall surface material 84 is formed with an opening 54 and an annular rib 56, similarly to the wall surface material 50. Therefore, the wall surface material 84 can obtain the same action and effect as the bearing wall 20.

Next, in order to prove that the bearing wall of the present invention can secure the bearing capacity from the beginning to the end of the earthquake, a simulation by finite element analysis was carried out to obtain the characteristics of the change of the horizontal load with respect to the interlayer change angle of the bearing wall. The obtained characteristics are shown graphically in FIG. 14 with the horizontal load on the vertical axis and the interlayer change angle on the horizontal axis. The simulated examples and comparative examples are as follows.

Example 1: A bearing wall having the same configuration as the bearing wall 20 of the embodiment according to the present invention, and having an opening having a diameter of an inscribed circle of 200 mm (see FIG. 3).
Example 2: A bearing wall having the same configuration as the bearing wall 70 of the embodiment according to the present invention, and having an opening having a diameter of an inscribed circle of 200 mm (see FIG. 7).
Comparative Example 1: A bearing wall having the same configuration as the bearing wall 100 of the comparative example and having an opening 104 having a diameter of 200 mm (see FIG. 9).
Comparative Example 2: A bearing wall having the same configuration as the bearing wall 110 of the comparative example, and having an opening 114 having a diameter of an inscribed circle of 200 mm (see FIG. 10).
Comparative Example 3: A bearing wall having the same configuration as the bearing wall 120 of the comparative example, and having an opening 124 having a diameter of an inscribed circle of 200 mm (see FIG. 11).
Comparative Example 4: A bearing wall having the same configuration as the bearing wall 130 of the comparative example, and having an opening 134 having a length of a minor axis of 200 mm (see FIG. 12).
Comparative Example 5: A bearing wall having the same configuration as the bearing wall 140 of the comparative example, and having an opening 144 having a length of a minor axis of 200 mm (see FIG. 13).

As shown in FIG. 14, the bearing walls of Examples 1 and 2 have a higher horizontal load with respect to the interlayer deformation angle than the bearing walls of Comparative Example 2-5.
Further, the bearing walls of Examples 1 and 2 have a horizontal load value close to that of the bearing wall of Comparative Example 1 with respect to the interlayer deformation angle. That is, it can be seen that the bearing walls of Examples 1 and 2 have substantially the same bearing capacity from the beginning to the end of the earthquake as the bearing walls of Comparative Example 1.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be modified in various ways other than the above within a range not deviating from the gist thereof. Of course. For example, in the above-described embodiment, the wall surface material according to one embodiment of the present invention is used for the bearing wall, but it is used for a portion where in-plane rigidity is required, such as a floor surface or a roof surface of a building. You may.

20 Bearing wall 24 Vertical frame material (vertical material)
26 Vertical frame material (vertical material)
28 Vertical frame material (vertical material)
50 Wall material 54 Opening 54A Square 54AE Apex 56 Circular rib 70 Bearing wall 72 Wall material 74 Opening 74A Corner 74AE Vertex 80 Bearing wall 82 Vertical material 84 Wall material SL Straight line D1 Center-to-center distance D2 Horizontal distance

Claims (5)

A pair of vertical members extending in the vertical direction,
A wall surface material which is joined to the pair of vertical members and has an opening provided with an annular rib at an edge formed in a row at intervals in the vertical direction.
With
The shape of the opening is a polygonal shape having an even number of corners.
The bearing wall material is symmetrical with respect to the straight line extending in the vertical direction, and the opening is formed so that the vertices of the corners facing each other are located on the straight line. wall. The bearing wall according to claim 1, wherein the adjacent openings have the same size. The bearing wall according to claim 1 or 2, wherein the opening is a square shape in which the vertices of the corners are arranged on the straight line. The bearing according to any one of claims 1 to 3, wherein the distance between the centers of the openings adjacent to each other in the vertical direction is shorter than the horizontal distance between the joint points between the pair of vertical members and the wall surface members. wall. A wall material that is joined to a pair of vertical members that extend in the vertical direction.
A polygonal opening formed at intervals in the vertical direction and having an even number of corners,
An annular rib provided at the edge of the opening and
With
A wall surface material that is symmetrical with respect to the straight line extending in the vertical direction and in which the vertices of the corners facing each other of the opening are located on the straight line.