JP2020007860A - Load-bearing wall - Google Patents

Abstract

To provide a load-bearing wall that has a small number of parts, requires little processing time, can avoid local concentration of shear deformation and rotational deformation, and can cope with a narrow width.SOLUTION: In a load-bearing wall 10, an H-shaped steel 11 having a web 12 and a flange 13 connected to the web 12 at right angles is disposed with its longitudinal direction facing up and down. The upper and lower ends are joined to horizontal structural members 17, 17. A plurality of openings 14 are provided in the web 12 at predetermined intervals in the longitudinal direction. A portion between the openings 14, 14 adjacent in the longitudinal direction is a deformable portion 15 capable of absorbing energy. A portion of the H-shaped steel 11 excluding the opening 14 and the deformable portion 15 is a vertical frame portion 16 extending vertically. The upper and lower ends of the vertical frame portion 16 are connected to the horizontal structural members 17, 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a load-bearing wall formed of a metal member such as a shape steel having a web and a flange.

BACKGROUND ART In a steel frame prefabrication used for a house building, a load-bearing wall including a vertical frame member formed of a shape steel to resist vertical force and horizontal force and a shear resistance element formed of a face material is installed. In recent years, load-bearing walls and structures with improved seismic performance using energy absorbing members have been proposed (for example, see Patent Documents 1 to 5).
The load-bearing wall described in Patent Literature 1 includes a wall material having circular openings arranged in a row at a vertical interval between a pair of vertical members, and further, one opening adjacent in the vertical direction The distance between the center of the portion and the center of the other opening is set to be shorter than the distance between the vertical member and the joint between the wall members.
In the structure described in Patent Literature 2, a plurality of energy absorbing members are detachably attached to attachment members provided on pillars by bolts. The energy absorbing member is made of low yield point steel, is sandwiched between the regulating member and the mounting member, restrains deformation in the out-of-plane direction, and absorbs seismic energy acting in the in-plane direction.
The structure described in Patent Literature 3 includes an earthquake-resistant member in which a region having a low yield strength is provided in a web of an H-section steel. The region with a low yield strength is formed by replacing the web with a low yield point steel or by providing a plurality of slits in the web.
The structure described in Patent Literature 4 includes a bending-yield type damper formed of an H-shaped steel having bending rigidity reduction portions provided at both ends in the longitudinal direction, and prevents shear yielding of the web at the end of the H-shaped steel. Reinforcement portion is provided.
In the structure described in Patent Literature 5, a long steel material (H-shaped steel, T-shaped steel) is connected at a predetermined interval to a connecting member made of mild steel in a structure surrounded by opposing columns and beams. (Steel plate) connected seismic dampers connected at specified locations to seismic studs connected to mounting members (brackets) protruding from the upper and lower beams into the structure, and connected to multiple vibration dampers To form a shear wall.

WO2015 / 034099 JP-A-2000-274107 JP-A-10-153012 JP 2017-137919 A JP-A-11-256871

However, in the load-bearing walls and structures described in Patent Literature 1, Patent Literature 2, and Patent Literature 5, a vertical frame material (channel steel (Patent Literature 1), a square steel tubular column (Patent Literature 2), and a long steel material (Patent Literature 2) Literature 5)) and a connecting member (wall material (Patent Literature 1), energy absorbing member (Patent Literature 2), connecting member (Patent Literature 5)) are assembled to form an anti-seismic member (bearing wall (Patent Literature 1), Since the members (Patent Literature 2) and the vibration damper (Patent Literature 5) are configured, there is a problem that the number of parts is large and the processing time is large.
Further, in the structure described in Patent Literature 3, since the slit is provided at the longitudinal center of the web of the H-section steel, local shear deformation occurs at the longitudinal center of the web. Further, in the structure described in Patent Document 4, local rotational deformation occurs at both ends in the longitudinal direction of providing openings in the web of the H-section steel. Thus, in the structures described in Patent Documents 3 and 4, since deformation concentrates on a specific portion in the longitudinal direction of the H-section steel, support of vertical force cannot be expected, and resistance to both horizontal force and vertical force cannot be expected. It becomes difficult to apply to a load-bearing wall.
Further, in the structures described in Patent Literatures 1 and 5, there is also a problem that the wall material and the mounting member at the upper and lower ends of the vertical frame member hinder smooth shearing deformation of the connecting member.
Furthermore, in order to increase the degree of freedom in designing (such as providing a large opening in a site with a narrow frontage), there is a growing need for a bearing wall capable of handling a narrow width (about 450 mm width).

  The present invention has been made in view of the above circumstances, and provides a load-bearing wall that has a small number of parts, requires little processing time, can avoid local concentration of shear deformation and rotational deformation, and can cope with a narrow width. With the goal.

In order to achieve the above object, the load-bearing wall of the present invention has a web and a metal member having a flange connected to the web at right angles, the longitudinal direction of the metal member is arranged vertically, and the upper and lower ends are formed. A load-bearing wall coupled to a horizontal structural member disposed above and below the metal member,
A plurality of openings are provided in the web at predetermined intervals in the longitudinal direction,
A portion between the openings adjacent in the longitudinal direction is a deformable portion capable of absorbing energy,
Of the metal member, a portion excluding the opening and the deformable portion is a vertical frame portion extending vertically,
Upper and lower ends of the vertical frame portion are coupled to the horizontal structural member.

Here, examples of the metal member include, but are not limited to, metal members such as steel, aluminum, and stainless steel. In short, any metal member having sufficient strength to form a load-bearing wall may be used.
The metal member may have a web and a flange. For example, a metal member having an H-shaped or I-shaped cross section as typified by an H-shaped steel or an I-shaped steel, or a channel steel. Any metal member having a U-shaped cross section may be used.
Further, the web and the flange may be integrally formed by rolling or the like from a metal material, or the separately formed web and flange may be joined by welding or the like.

In the present invention, provided on the web of the metal member, a portion between the openings adjacent in the longitudinal direction is a deformable portion capable of absorbing energy, the metal member, the opening and the The portion excluding the deformable portion is a vertical frame extending vertically, and the upper and lower ends of the vertical frame are connected to the horizontal structural member, so that the number of parts is small and the processing time is reduced. Therefore, it is possible to provide a load-bearing wall exhibiting stable seismic performance while saving labor for processing and the number of parts.
Further, since a portion between the openings adjacent to each other in the longitudinal direction of the web is a deformable portion, the deformable portion can be arranged at a plurality of locations in the longitudinal direction of the web. For this reason, it is possible to avoid concentration of shear deformation and rotational deformation on a specific portion in the longitudinal direction of the web.
Furthermore, since a compact bearing wall is formed by a metal member in which the vertical frame portion and the deformable portion are integrated, it is possible to cope with a narrow bearing wall.

In the configuration of the present invention, the vertical dimension of the metal member is L (mm), the number of the deformable portions is n (n is a natural number), and the vertical width of the deformable portion is If the dimension is S (mm),
n × S / L = 1/50 to 1/10.

  According to such a configuration, when an external force such as an earthquake acts on the load-bearing wall, the plurality of deformable portions deform and can sufficiently absorb the energy due to the external force.

  Here, the reason for setting n × S / L = 1/50 to 1/10 is that if n × S / L is less than 1/50, the cross-sectional area of the deformable portion becomes small and the shearing of the deformable portion becomes small. This is because the resistance decreases, and the proof stress required for the load-bearing wall cannot be exerted. On the other hand, when nxS / L exceeds 1/10, the cross-sectional area of the deformable portion increases, and the shear of the deformable portion increases. Because the resistance becomes excessive, the vertical frame part and the part fixing the vertical frame part to the horizontal structural material (anchor part) may yield before the deformable part yields, and the energy absorption performance of the load-bearing wall Is not sufficiently exhibited.

  In the configuration of the present invention, a cutout communicating with the uppermost opening is provided at an upper end of the web, and the lowermost opening is provided at a lower end of the web. The vertical frame portion may be constituted by a pair of vertical members extending vertically and separated in a direction orthogonal to the longitudinal direction.

  According to such a configuration, the relative deformation of the pair of vertical members is not restricted, and the deformable portion connecting the pair of vertical members is smoothly sheared and deformed, thereby stably absorbing energy with respect to external force such as seismic force. Can be done.

Further, in the configuration of the present invention, a height dimension of the opening in the longitudinal direction may be larger than a width dimension in a direction orthogonal to the longitudinal direction.

  According to such a configuration, since the opening has a vertically long shape, the strength of the vertical frame portion can be secured while suppressing the strength of the deformable portion.

  Further, in the configuration of the present invention, a width dimension of the deformable portion in the longitudinal direction may gradually decrease toward a center portion of the web in a direction orthogonal to the longitudinal direction.

  According to such a configuration, the width of the deformable portion is gradually reduced toward the center of the web, so that the deformable portion is subjected to a combined load of shear and bending applied to the surface of the deformable portion. It is possible to adjust the region where the surface yields, and it is possible to improve the energy absorbing performance of the deformable portion.

  In the configuration of the present invention, the opening may be burred.

  According to such a configuration, since the opening is subjected to burring, a burring protrusion is formed along the edge of the opening and protrudes in the out-of-plane direction of the web. Therefore, the rigidity of the deformable portion and the vertical frame portion against out-of-plane deformation can be increased, and the earthquake-resistant performance of the load-bearing wall can be improved.

  In the configuration of the present invention, the metal member may have a flange strength higher than a web strength.

  According to such a configuration, by making the flange strength of the metal member higher than the web strength, it is possible to improve the strength of the vertical frame portion and further improve the energy absorbing performance of the deformable portion. In addition, by making the web strength lower than the flange strength, it is also possible to similarly improve the proof stress of the vertical frame portion and further improve the energy absorbing performance of the deformable portion.

  ADVANTAGE OF THE INVENTION According to this invention, the number of parts is small, processing effort is also small, the concentration of shear deformation and rotational deformation can be avoided, and it can respond to a narrower width.

3A and 3B illustrate a load-bearing wall according to the first embodiment, in which FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line AA in FIG. FIG. 4 is a front view of the load-bearing wall showing a state where an external force is acting. 6A and 6B illustrate a load-bearing wall according to a second embodiment, in which FIG. 7A is a front view, and FIG. 7B is a cross-sectional view taken along line AA in FIG. FIG. 4 is a front view of the load-bearing wall showing a state where an external force is acting. It is a front view showing a modification of a bearing wall concerning a 2nd embodiment. It is a front view showing a load-bearing wall concerning a 3rd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 is a front view showing a load-bearing wall 10 according to the first embodiment.
The load-bearing wall 10 has an H-shaped steel (metal member) 11 that is disposed with its longitudinal direction facing up and down. The H-section steel 11 includes a vertically long rectangular plate-shaped web 12 and a pair of right and left flanges 13, 13 joined by welding to edges of the web 12 along the longitudinal direction (vertical direction). I have. The flanges 13 are formed in a vertically long rectangular plate shape and are arranged at right angles to the web 12.
The H-section steel 11 has a flange strength higher than the web strength. For example, the web 12 is formed of 400N class steel, and the flange 13 is formed of 490N class steel. The H-section steel 11 may have a web strength lower than the flange strength. For example, the web 12 is formed of a steel material having a low yield point (about 100 Mpa), and the flange 13 is formed of 400N class steel (yield point of about 235 Mpa).

A plurality of (for example, five) openings 14 are provided in the web 12 at predetermined intervals in the longitudinal direction of the H-section steel 11 (the vertical direction in FIG. 1A). The opening 14 is formed in an oval shape that is long in the vertical direction, and penetrates in the thickness direction of the web 12 as shown in FIG. The vertical intervals between the vertically adjacent openings 14, 14 are all equal, but may be different.
The opening 14 at the center in the vertical direction is disposed at the center of the web 12 in the vertical direction (longitudinal direction). Further, the distance between the upper end of the uppermost opening 14 and the upper end of the web 12 is equal to the distance between the lower end of the lowermost opening 14 and the lower end of the web 12. I have.
The height h1 of the opening 14 in the longitudinal direction is larger than the width h2 in a direction perpendicular to the longitudinal direction. That is, the opening 14 is formed in a vertically long oval shape.

The portion between the openings 14 adjacent in the longitudinal direction of the web 12 (vertical direction in FIG. 1A) is formed when an external force (seismic force) acts on the load-bearing wall 10 during an earthquake or the like. The deformable portion 15 is capable of absorbing the energy of the external force. In FIG. 1A and FIG. 2, the deformable portion 15 is lightly blackened.
The deformable portion 15 can absorb the energy of the external force by undergoing shear deformation (in-plane deformation due to shearing accompanied by bending) when receiving the above-described external force. The width of the deformable portion 15 in the longitudinal direction of the H-section steel 11 gradually decreases toward the center of the web 12 in the direction orthogonal to the longitudinal direction.

  That is, of the openings 14, 14 which vertically sandwich the deformable portion 15, the lower end edge of the opening 14 located on the upper side is formed in a semi-circular shape with a downward convex, and the opening 14 located on the lower side. Is formed in an upwardly convex semicircular arc shape. The portion between the lower edge of the upper opening 14 formed in a downwardly convex semicircular shape and the upper edge of the lower opening 14 formed in the upwardly convex semicircular shape is a deformable portion. 15, the width dimension of the deformable portion 15 in the longitudinal direction (up-down direction) gradually decreases toward the center of the web 12 in a direction orthogonal to the longitudinal direction, and is changeable in the center. The width of the portion 15 in the vertical direction is minimum.

Further, the vertical dimension of the H-section steel 11 is L (mm), the number of the deformable sections 15 is n (n is a natural number), and the minimum vertical dimension of the deformable section 15 is S (mm). )
n × S / L = 1/50 to 1/10.
As described above, the ratio of the vertical width S of the plurality of (n) deformable portions 15 to the vertical height L (mm) of the H-section steel 11 is defined as n × S / L. If is less than 1/50, the total cross-sectional area of the plurality of deformable portions 15 is reduced, and the shear resistance of the deformable portions is reduced. When nxS / L exceeds 1/10, the total cross-sectional area of the plurality of deformable portions 15 increases, and the shear resistance of the deformable portions becomes excessive, so that the vertical frame portion before the deformable portions yield. This is because the portion (anchor portion) fixing the vertical frame portion to the horizontal structural member may yield in advance, and the energy absorption performance of the load-bearing wall cannot be sufficiently exhibited.

Here, the dimensions of each part of the load-bearing wall 10 are as follows.
For example, the height L in the vertical direction of the H-section steel 11 is 2700 mm, but may be about 2700 to 3600 mm. The width H of the H-section steel 11 is 450 mm, but may be about 250 to 500 mm. The minimum width dimension S of the deformable portion 15 in the vertical direction is 20 mm, but may be about 10 to 50 mm. The height h1 of the opening 14 in the vertical direction is 520 mm, but may be about 300 to 700 mm. The width h2 of the opening 14 in the left-right direction is 200 mm. 0.8H, that is, about 25mm-400mm.
Further, the thickness of the web 12 of the H-section steel 11 is 3.2 mm, but may be about 2.3 to 6.0 mm. The thickness of the flange is 12 mm, but may be about 6 to 16 mm. The width B of the flange 13 is 80 mm, but may be about 80 to 150 mm. These dimensions may be appropriately set according to the number n of the deformable portions 15. Although the number n of the deformable portions 15 is n = 4 in FIG. 1, it is sufficient that n = about 2 to 10.

A portion of the H-shaped steel 11 excluding the opening 14 and the deformable portion 15 is a vertical frame portion 16 extending vertically. That is, the portion of the web 12 of the H-section steel 11 excluding the opening 14 and the deformable portion 15 and the pair of left and right flanges 13 constitute a vertical frame portion 16.
The upper and lower ends of the vertical frame portion 16 are connected to horizontal structural members 17, 17 disposed above and below the H-section steel 11 via a base plate 20.
That is, first, the upper horizontal structural member 17 is a beam of a building, and the lower horizontal structural member 17 is a foundation or a beam of a building. The horizontal structural member 17 is formed of an H-shaped steel, and is disposed with the upper and lower flanges 17a, 17a oriented in the horizontal direction. Further, stiffeners 17c, 17c are provided between upper and lower flanges 17a, 17a at a portion where the vertical frame portion 16 of the horizontal structural member 17 is joined. And are joined by welding. Further, the stiffeners 17c, 17c are arranged on an extension of the flanges 13, 13 of the vertical frame portion 16.

On the other hand, base plates 20, 20 are fixed to the upper and lower ends of the vertical frame 16 by welding, respectively. The base plate 20 has a rectangular plate shape formed of a steel material. The length of the long side is longer than the width H of the H-shaped steel 11, and the length of the short side is the width B of the flange 13 of the H-shaped steel 11. It is longer and shorter than the width of the flange 17 a of the horizontal structural member 17.
The base plate 20 has a total of eight bolt insertion holes, four on each of the left and right sides, at positions sandwiching the pair of flanges 13, 13 of the vertical frame 16 in the thickness direction of the flange 13 in plan view. I have.

The upper end of the vertical frame 16 contacts the base plate 20 provided at the upper end with the lower flange 17 a of the upper horizontal structural member 17, and then the bolt insertion hole provided in the base plate 20. By inserting a bolt 18 into a bolt insertion hole provided in the lower flange 17a of the upper horizontal structural member 17 and screwing and tightening a nut (not shown) to the bolt 18, the upper horizontal structural member 17 17 via a base plate 20.
Further, the lower end of the vertical frame portion 16 contacts the base plate 20 provided at the lower end with the upper flange 17 a of the lower horizontal structural member 17, and then a bolt insertion hole provided in the base plate 20. The bolt 18 is inserted through a bolt insertion hole provided in the upper flange 17 a of the lower horizontal structural member 17 and a nut (not shown) is screwed into the bolt 18 to tighten the bolt 18. It is connected to the horizontal structural member 17 via a base plate 20.

  As shown in FIG. 2, when a horizontal external force (seismic force) F acts on the load-bearing wall 10 having such a configuration due to an earthquake or the like, the upper and lower horizontal structural members 17 are relatively displaced in the horizontal direction. . As a result, the load-bearing wall 10 is displaced so as to fall down, and the deformable portion 15 is sheared and deformed to absorb energy of an external force (earthquake force). Thus, the performance of the bearing wall 10 to absorb energy with respect to the seismic force can be enhanced, and the earthquake resistance performance of the bearing wall 10 can be improved.

As described above, according to the present embodiment, the portion between the openings 14, 14 provided in the web 12 of the H-section steel 11 and adjacent in the longitudinal direction is capable of absorbing the energy with the deformable portion 15. A portion of the H-shaped steel 11 excluding the opening portion 14 and the deformable portion 15 is a vertical frame portion 16 extending vertically, and upper and lower ends of the vertical frame portion 16 are horizontal structures. Since it is connected to the members 17, 17, the number of parts is reduced and the processing time is reduced as compared with the related art. Therefore, it is possible to provide a load-bearing wall exhibiting stable seismic performance while saving labor for processing and the number of parts.
In addition, since the portion between the openings 14 adjacent to each other in the longitudinal direction of the web 12 is the deformable portion 15, the deformable portion 15 can be arranged at a plurality of locations in the longitudinal direction of the web 12. For this reason, it is possible to prevent the shear deformation and the rotational deformation from being concentrated on a specific portion in the longitudinal direction of the web 12.
Further, since the vertical bearing portion 16 and the deformable portion 15 are integrated into the H-shaped steel 11 to form the compact bearing wall 10, it is possible to cope with a narrow bearing wall.

  The vertical dimension of the H-section steel 11 is L (mm), the number of the deformable portions 15 is n (n is a natural number), and the vertical width of the deformable portion 15 is S (mm). Then, since n × S / L = 1/50 to 1/10, when an external force such as an earthquake acts on the load-bearing wall 10, the plurality of deformable portions 15 deform the energy due to the external force. , Can be fully absorbed.

Further, since the height dimension h1 in the longitudinal direction of the opening 14 is larger than the width dimension h2 in the direction orthogonal to the longitudinal direction, the proof strength of the vertical frame portion 16 is reduced while the proof strength of the deformable portion 15 is suppressed. Can be secured.
In addition, since the width dimension of the deformable portion 15 in the longitudinal direction gradually decreases toward the center in the direction perpendicular to the longitudinal direction of the web 12, the energy absorbing performance of the deformable portion 15 is improved. Can be.

(Second embodiment)
FIG. 3 is a front view showing a load-bearing wall 10A according to the second embodiment. The difference between the load-bearing wall 10A of the present embodiment and the load-bearing wall 10 of the first embodiment is the configuration of the vertical frame portion 16, so that this point will be described below and is the same as that of the first embodiment. The same reference numerals are given to the components, and the description may be omitted.

As in the first embodiment, the web 12 of the H-section steel 11 is provided with one opening 14 at the center of the web 12 in the vertical direction (longitudinal direction), and sandwiches the opening 14 vertically. A pair of openings 14 are provided at positions.
Further, in the present embodiment, unlike the first embodiment, an opening 14A is provided above the upper opening 14 of the pair of openings 14, 14, and the lower opening 14A is provided. An opening 14A is provided below 14. The space between the vertically adjacent openings 14 and 14 is equal to the space between the vertically adjacent openings 14 and 14A.

Further, as in the first embodiment, the portion between the openings 14 adjacent in the longitudinal direction of the web 12 (the vertical direction in FIG. 3A) has a force-bearing wall in the event of an earthquake or the like. When acting on 10, the deformable portion 15 can absorb the energy of the external force.
Further, in the present embodiment, a similar deformable portion 15 is provided between the opening 14A and the opening 14A that are vertically adjacent to each other. In FIGS. 3A and 4, the deformable portion 15 is lightly blackened.

  Further, as in the first embodiment, the width of the deformable portion 15 in the longitudinal direction of the H-section steel 11 gradually decreases toward the center of the web 12 in the direction orthogonal to the longitudinal direction. That is, similarly to the first embodiment, the lower end edge of the opening 14 located on the upper side is formed in a semicircular shape with a downward convex, and the upper end edge of the opening 14 located on the lower side is a semicircle with an upward convexity. By being formed in an arc shape, the width dimension of the deformable portion 15 in the longitudinal direction gradually decreases toward the center of the web 12 in a direction orthogonal to the longitudinal direction.

Separately from this, as in the modification shown in FIG. 5, the lower edge of the opening 14 located on the upper side is formed in a downwardly convex triangular shape, and the upper edge of the opening 14 located on the lower side is raised. By forming a convex triangular shape, the width dimension of the deformable portion 15 in the longitudinal direction may be gradually reduced toward the center of the web 12 in a direction orthogonal to the longitudinal direction.
Also in the first embodiment, the lower edge of the upper opening 14 is formed in a downwardly convex triangular shape, and the upper edge of the lower opening 14 is formed in an upwardly convex triangular shape. By doing so, the width dimension of the deformable portion 15 in the longitudinal direction may be gradually reduced toward the center of the web 12 in the direction orthogonal to the longitudinal direction.
Further, the vertical dimension of the H-section steel 11 is L (mm), the number of the deformable sections 15 is n (n is a natural number), and the minimum vertical dimension of the deformable section 15 is S (mm). ), N × S / L = 1/50 to 1/10 as in the first embodiment.
In addition, the downwardly protruding triangular shape of the lower end edge and the upwardly protruding triangular shape of the upper end edge of the opening 14 may be a trapezoidal shape of a downward convex and an upward convex trapezoid having a flat end. In this case, the width dimension of the deformable portion 15 gradually decreases toward the center portion, but does not decrease gradually in the vicinity of the center portion, and has a uniform width.

  Further, as shown in FIG. 3A, in the present embodiment, a notch 12a communicating with the uppermost opening 14A is provided at the upper end of the web 12 of the H-section steel 11, and the web 12 The notch 12 a communicating with the lowermost opening 14 </ b> A is provided at the lower end of the vertical section 12, so that the vertical frame 16 extends vertically and is orthogonal to the longitudinal direction of the H-section steel 11. And a pair of left and right vertical members 16a, 16a spaced apart from each other. The vertical member 16 a is located outside the opening portions 14 and 14 A and the deformable portion 15 in the width direction of the H-section steel 11, and is constituted by a web piece having a width of about ３ of the web 12 and one flange 13. ing.

The upper and lower ends of a pair of left and right vertical members 16a, 16a constituting the vertical frame portion 16 are connected to horizontal structural members 17, 17 via base plates 21, 21, respectively.
That is, first, base plates 21 and 21 are fixed to upper and lower ends of one vertical member 16a by welding, and base plates 21 and 21 are fixed to upper and lower ends of the other vertical member 16a by welding.
The base plate 21 has a rectangular plate shape formed of a steel material. The length of the long side is shorter than the width H of the H-section steel 11, and the length of the short side is the width B of the flange 13 of the H-section steel 11. It is longer and shorter than the width of the flange 17 a of the horizontal structural member 17.
The base plates 21 and 21 are arranged left and right apart from each other, and are located in the notch 12a therebetween.
Further, the base plate 21 is provided with a total of four bolt insertion holes at positions where the flange 13 of the vertical member 16a is sandwiched in the thickness direction of the flange 13 in a plan view.

The upper end portions of the pair of left and right vertical members 16a, 16a of the vertical frame portion 16 contact the base plates 21, 21 provided on the upper end portions with the lower flange 17a of the upper horizontal structural member 17, and A bolt 18 is inserted through a bolt insertion hole provided in the base plates 21 and 21 and a bolt insertion hole provided in the lower flange 17a of the upper horizontal structural member 17, and a nut (not shown) is inserted into the bolt 18. By screwing and tightening, it is connected to the upper horizontal structural member 17 via the base plates 21 and 21.
Also, the lower ends of the pair of left and right vertical members 16a, 16a of the vertical frame 16 contact the base plates 21, 21 provided at the lower ends with the upper flange 17a of the lower horizontal structural member 17, respectively. A bolt 18 is inserted through a bolt insertion hole provided in the base plates 21 and 21 and a bolt insertion hole provided in the upper flange 17a of the lower horizontal structural member 17, and a nut (not shown in the figure) is inserted into the bolt 18. ) Is screwed together and fastened to the lower horizontal structural member 17 via the base plates 21 and 21.

  As shown in FIG. 4, when a horizontal external force (seismic force) F acts on the load-bearing wall 10A having such a structure due to an earthquake or the like, the upper and lower horizontal structural members 17, 17 are relatively displaced in the horizontal direction. . As a result, the load-bearing wall 10 is displaced so as to fall down, and the deformable portion 15 is sheared and deformed to absorb energy of an external force (earthquake force). Thereby, the seismic performance of the load-bearing wall 10A can be improved.

According to this embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained.
That is, at the upper end of the web 12, a notch 12a communicating with the uppermost opening 14A is provided, and at the lower end of the web 12, the notch 12a communicating with the lowermost opening 14A. Is provided, the vertical frame portion 16 is constituted by a pair of vertical members 16a, 16a extending vertically and separated in a direction orthogonal to the longitudinal direction of the H-section steel 11, so that the pair of vertical members Relative deformation of the members 16a, 16a is not restricted, and the plurality of deformable portions 15 connecting the pair of vertical members 16a, 16a are smoothly sheared and deformed, and energy absorption against external force such as seismic force is stabilized. Can be.

(Third embodiment)
FIG. 6 is a front view showing a load-bearing wall 10B according to the third embodiment. The difference between the load-bearing wall 10A of the present embodiment and the load-bearing wall 10A of the second embodiment is the configuration of the openings 14 and 14A. Therefore, this point will be described below and the second embodiment will be described. The same components are denoted by the same reference numerals and description thereof may be omitted.

In the present embodiment, the openings 14 and 14A are subjected to burring. By this burring process, burring protrusions 22 projecting out of the plane of the web 12 along the edges of the openings 14 and 14A are formed. All the burring projections 22 may protrude out of the plane from one plate surface of the web 12, or some of the plurality of burring protrusions 22 protrude out of the plane from one plate surface. The remaining burring projections 22 may protrude out of the other plate surface.
Note that such a burring protrusion 22 may be formed in the opening 14 in the first embodiment.

  According to the present embodiment, the same effects as those of the second embodiment can be obtained. In addition, the burring process is performed on the openings 14 and 14A so that the burring protrusions are formed along the edges of the openings 14 and 14A. Since the 22 is formed, the rigidity of the deformable portion 15 and the vertical frame portion 16 against out-of-plane deformation can be increased, and the effect of improving the seismic performance of the load-bearing wall can be obtained.

10, 10A, 10B Load-bearing wall 11 H-section steel (metal member)
DESCRIPTION OF SYMBOLS 12 Web 12a Notch 13 Flange 14, 14A Opening 15 Deformable part 16 Vertical frame part 16a Vertical member 17 Horizontal structural material

Claims (7)

A metal member having a web and a flange connected to the web at right angles is disposed with its longitudinal direction facing up and down, and upper and lower ends are connected to horizontal structural members disposed above and below the metal member. Bearing wall that is
A plurality of openings are provided in the web at predetermined intervals in the longitudinal direction,
A portion between the openings adjacent in the longitudinal direction is a deformable portion capable of absorbing energy,
Of the metal member, a portion excluding the opening and the deformable portion is a vertical frame portion extending vertically,
A load-bearing wall, wherein upper and lower ends of the vertical frame portion are joined to the horizontal structural member. Assuming that the vertical dimension of the metal member is L (mm), the number of the deformable portions is n (n is a natural number), and the vertical dimension of the deformable portion is S (mm),
The load-bearing wall according to claim 1, wherein n × S / L = 1/50 to 1/10.   A notch communicating with the uppermost opening is provided at the upper end of the web, and a notch communicating with the lowermost opening is provided at the lower end of the web. The load-bearing wall according to claim 1, wherein the vertical frame portion is constituted by a pair of vertical members extending vertically and separated in a direction orthogonal to the longitudinal direction.   4. The load-bearing wall according to claim 1, wherein a height of the opening in the longitudinal direction is larger than a width of the opening in a direction perpendicular to the longitudinal direction. 5.   The width dimension of the deformable portion in the longitudinal direction is gradually reduced toward a central portion of the web in a direction orthogonal to the longitudinal direction. Load-bearing wall.   The load-bearing wall according to any one of claims 1 to 5, wherein the opening is burring-processed.   The load-bearing wall according to any one of claims 1 to 6, wherein the metal member has a flange strength higher than a web strength.

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