JP7180155B2 - bearing wall - Google Patents

Description

The present invention relates to a load-bearing wall made of metal members, such as section steel, having webs and flanges.

In steel frame prefabricated houses used in residential construction, load-bearing walls are installed that consist of vertical frame members made of shaped steel to resist vertical and horizontal forces, and shear resistance elements made of face plates. In recent years, there have been proposed load-bearing walls and structures that use energy-absorbing members to enhance earthquake-resistant performance (see Patent Documents 1 to 5, for example).
The load-bearing wall described in Patent Document 1 includes a wall member having circular openings arranged in a row with a gap in the vertical direction between a pair of vertical members, and one opening that is adjacent in the vertical direction. The wall material is provided so that the distance between the center of the part and the center of the other opening is set to be shorter than the distance between the vertical member and the joint of the wall material.
In the structure described in Patent Document 2, a plurality of energy absorbing members are detachably attached to a mounting member provided on a pillar with bolts. The energy absorbing member is made of low-yield-strength steel, and is clamped between the restricting member and the mounting member to restrain deformation in the out-of-plane direction, thereby absorbing seismic energy acting in the in-plane direction.
The structure described in Patent Literature 3 includes a seismic member in which a web of H-beam steel is provided with a region of low yield strength. The low yield strength region is constructed by replacing the web with low yield point steel or by providing a plurality of slits in the web.
In the structure described in Patent Document 4, a bending yield type damper made of H-section steel provided with bending rigidity reduction portions at both ends in the longitudinal direction is provided to prevent shear yielding of the web at the ends of the H-section steel. Reinforcements are provided for this purpose.
In the structure described in Patent Document 5, long steel materials (H-shaped steel, T-shaped steel) are placed at predetermined intervals in a structural surface surrounded by opposing columns and beams, and connecting members made of mild steel are provided. The seismic dampers are connected at predetermined points by (steel plates) to the mounting members (brackets) that protrude from the upper and lower beams into the structure plane to form seismic studs, and multiple dampers are connected. and constitute a seismic 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 Document 1, Patent Document 2 and Patent Document 5, vertical frame members (channel steel (Patent Document 1), square steel pipe columns (Patent Document 2), long steel materials (Patent Document 2) Literature 5)) and connecting members (wall surface material (Patent Literature 1), energy absorbing member (Patent Literature 2), connecting member (Patent Literature 5)) are assembled to form an earthquake-resistant member (bearing wall (Patent Literature 1), earthquake-resistant Since the member (Patent Document 2) and the vibration control damper (Patent Document 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 Document 3, since the slit is provided in the longitudinal central portion of the web of the H-section steel, local shear deformation occurs in the longitudinal central portion of the web. In addition, in the structure described in Patent Document 4, local rotational deformation occurs at both ends in the longitudinal direction where the openings are provided in the H-section steel web. From this, in the structures described in Patent Documents 3 and 4, deformation is concentrated in a specific portion in the longitudinal direction of the H-section steel, and therefore vertical force cannot be expected to be supported, and both horizontal force and vertical force are resisted. However, it is difficult to apply to load-bearing walls.
Moreover, in the structures described in Patent Documents 1 and 5, there is also the problem that wall surface materials and mounting members prevent smooth shear deformation of the connecting members at the upper and lower ends of the vertical frame members.
Furthermore, in order to increase the degree of freedom in design (for example, to provide a large opening in a site with a narrow frontage), there is a growing need for load-bearing walls that can accommodate narrow widths (about 450 mm wide).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a load-bearing wall which has a small number of parts, requires little processing labor, 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 comprises a metal member having a web and flanges joined perpendicularly to the web, the longitudinal direction of which is oriented vertically, and the upper and lower ends are A load-bearing wall coupled to horizontal structural members arranged 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 that extends vertically,
The upper and lower ends of the vertical frame part are combined with the horizontal structure member.

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

In the present invention, a web of metal members is provided with a deformable portion capable of absorbing energy at a portion between longitudinally adjacent openings, and the openings and the The portion other than the deformable portion forms a vertically extending vertical frame portion, and the upper and lower ends of the vertical frame portion are connected to the horizontal structural member, so the number of parts is reduced and the processing labor is also reduced. Therefore, it is possible to provide a load-bearing wall that exerts stable seismic performance while reducing the number of machining and parts.
In addition, since the portions between the openings adjacent to each other in the longitudinal direction of the web are deformable portions, the deformable portions can be arranged at a plurality of locations in the longitudinal direction of the web. Therefore, it is possible to avoid the concentration of shear deformation and rotational deformation on a specific portion of the web in the longitudinal direction.
Furthermore, since the vertical frame portion and the deformable portion are integrated into a metal member to form a compact load-bearing wall, a narrow load-bearing wall can also be accommodated.

Further, in the configuration of the present invention, the vertical height 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),
It may be 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, n × S / L = 1/50 to 1/10 is because when n × S / L is less than 1/50, the cross-sectional area of the deformable part becomes small, and the shear of the deformable part This is because the load bearing wall cannot exhibit the necessary bearing force due to the decrease in resistance. Since the resistance becomes excessive, the vertical frame part and the part (anchor part) that fixes the vertical frame part to the horizontal structure will yield first before the deformable part yields, and the energy absorption performance of the load-bearing wall will be reduced. This is because it is not possible to make full use of

Further, in the configuration of the present invention, a notch portion communicating with the uppermost opening is provided at the upper end of the web, and the lowermost opening is provided at the lower end of the web. The vertical frame portion may be configured by a pair of vertical members extending vertically and spaced apart in a direction orthogonal to the longitudinal direction by providing a notch portion communicating with the vertical frame portion.

According to such a configuration, relative deformation of the pair of vertical members is not constrained, and the deformable portion connecting the pair of vertical members smoothly undergoes shear deformation, stabilizing energy absorption against external forces such as seismic force. can be made

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

According to such a configuration, since the opening has a shape elongated in the vertical direction, it is possible to secure the yield strength of the vertical frame portion while suppressing the yield strength of the deformable portion.

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

According to this configuration, the width dimension of the deformable portion gradually decreases toward the center of the web. Yield region can be adjusted, and the energy absorption performance of the deformable portion can be improved.

Moreover, in the configuration of the present invention, the opening may be burred.

According to such a configuration, since the openings are burred, burring projections are formed along the edges of the openings so as to protrude in the out-of-plane direction of the web. Therefore, the rigidity against out-of-plane deformation of the deformable portion and the vertical frame portion can be increased, and the seismic performance of the load-bearing wall can be improved.

Moreover, in the configuration of the present invention, the flange strength of the metal member may be higher than the 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 yield strength of the vertical frame portion and further improve the energy absorption performance of the deformable portion. Similarly, by making the web strength lower than the flange strength, it is possible to improve the yield strength of the vertical frame portion and further improve the energy absorption performance of the deformable portion.

According to the present invention, the number of parts is small, the processing labor is small, the concentration of shear deformation and rotational deformation can be avoided, and narrower widths can be handled.

1 shows a load-bearing wall according to a first embodiment, (a) is a front view, and (b) is a cross-sectional view taken along the line AA in (a). It is a front view of a load-bearing wall showing the state where external force is acting equally. FIG. 10 shows a load-bearing wall according to a second embodiment, where (a) is a front view and (b) is a cross-sectional view taken along the line AA in (a). It is a front view of a load-bearing wall showing the state where external force is acting equally. It is a front view which shows the modification of the load-bearing wall based on 2nd Embodiment. It is a front view which shows the load-bearing wall which concerns on 3rd Embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a front view showing the load-bearing wall 10 of the first embodiment.
The load-bearing wall 10 has an H-shaped steel (metal member) 11 arranged with its longitudinal direction facing up and down. The H-section steel 11 includes a vertically elongated rectangular plate-like web 12 and a pair of left and right flanges 13, 13 welded to the edges along the longitudinal direction (vertical direction) of the web 12. there is The flanges 13 , 13 are formed in the shape of vertically elongated rectangular plates and arranged at right angles to the web 12 .
The H-section steel 11 has a flange strength higher than the web strength. For example, web 12 is made of 400N grade steel and flange 13 is made of 490N grade steel. Also, the H-section steel 11 may have a web strength lower than the flange strength. For example, the web 12 is made of steel with a low yield point (about 100 Mpa), and the flange 13 is made 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 (vertical direction in FIG. 1(a)). The opening 14 is formed in an oval shape elongated in the vertical direction, and penetrates the web 12 in the plate thickness direction as shown in FIG. 1(b). Although the vertical intervals between the vertically adjacent openings 14, 14 are all equal, they may be different.
In addition, the opening 14 in the central portion in the vertical direction is arranged in the central portion in the vertical direction (longitudinal direction) of the web 12 . Furthermore, 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. there is
Moreover, the height dimension h1 of the opening 14 in the longitudinal direction is larger than the width dimension h2 in the direction orthogonal to the longitudinal direction. In other words, the opening 14 is formed in a vertically long oval shape.

In addition, when an external force (earthquake force) acts on the load-bearing wall 10 during an earthquake or the like, the portion between the openings 14, 14 adjacent in the longitudinal direction of the web 12 (vertical direction in FIG. 1A) is , the deformable portion 15 capable of absorbing the energy of the external force. 1(a) and 2, the deformable portion 15 is painted with light ink.
The deformable portion 15 can absorb the energy of the external force by shearing deformation (in-plane deformation due to shearing with bending) when receiving the above-described external force. Also, the width dimension of the deformable portion 15 in the longitudinal direction of the H-shaped steel 11 gradually decreases toward the central portion of the web 12 in the direction orthogonal to the longitudinal direction.

That is, of the openings 14, 14 positioned to sandwich the deformable portion 15 from above and below, the lower edge of the opening 14 located on the upper side is formed in a downward convex semicircular arc shape, and the opening 14 located on the lower side The upper edge of the is formed in an upwardly convex semicircular arc shape. A portion between the lower edge of the upper opening 14 formed in a downwardly convex semi-arc shape and the upper edge of the lower opening 14 formed in an upwardly convex semi-arc shape is a deformable portion. 15, the width dimension of the deformable portion 15 in the longitudinal direction (vertical direction) gradually decreases toward the central portion in the direction orthogonal to the longitudinal direction of the web 12, and the width of the deformable portion 15 is variable at the central portion. The vertical width dimension of the portion 15 is the minimum.

In addition, the vertical height dimension of the H-shaped steel 11 is L (mm), the number of deformable portions 15 is n (n is a natural number), and the minimum vertical width dimension of the deformable portion 15 is S (mm ), then
n×S/L=1/50 to 1/10.
Thus, the ratio of the vertical width dimension S of the plurality (n pieces) of deformable portions 15 to the vertical height dimension L (mm) of the H-shaped steel 11 is determined by n × S / L 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, so that the bearing wall cannot exhibit the necessary bearing strength. When n×S/L exceeds 1/10, the total cross-sectional area of the plurality of deformable portions 15 becomes large, and the shear resistance of the deformable portions becomes excessive. This is because the portion (anchor portion) fixing the vertical frame portion to the horizontal structural member will yield first, and the energy absorbing performance of the load-bearing wall cannot be sufficiently exhibited.

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

A portion of the H-shaped steel 11 excluding the opening 14 and the deformable portion 15 forms a vertical frame portion 16 extending vertically. That is, the portion of the web 12 of the H-shaped steel 11 excluding the opening 14 and the deformable portion 15 and the pair of left and right flanges 13 , 13 form the vertical frame portion 16 .
Upper and lower end portions of the vertical frame portion 16 are coupled to horizontal structural members 17 , 17 arranged above and below the H-shaped steel 11 via a base plate 20 .
First, the upper horizontal structural member 17 is the beam of the building, and the lower horizontal structural member 17 is the foundation or beam of the building. The horizontal structural member 17 is formed of H-shaped steel, and is arranged with upper and lower flanges 17a, 17a directed horizontally. Further, stiffeners 17c, 17c are provided between the upper and lower flanges 17a, 17a at the portion where the vertical frame portion 16 of the horizontal structural member 17 is connected. and are joined by welding. Further, the stiffeners 17c, 17c are arranged on extension lines of the flanges 13, 13 of the vertical frame portion 16. As shown in FIG.

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

The upper end portion of the vertical frame portion 16 contacts the lower flange 17a of the upper horizontal structural member 17 with the base plate 20 provided at the upper end portion, and then the bolt insertion hole provided in the base plate 20. A bolt 18 is inserted into a bolt insertion hole provided in the lower flange 17a of the upper horizontal structural member 17, and a nut (not shown) is screwed onto the bolt 18 and tightened to tighten the upper horizontal structural member. 17 via a base plate 20 .
In addition, the lower end of the vertical frame portion 16 abuts the base plate 20 provided at the lower end on the upper flange 17a of the horizontal structural member 17 on the lower side, and then the bolt insertion hole provided in the base plate 20. After inserting the bolt 18 into the bolt insertion hole provided in the upper flange 17a of the lower horizontal structural member 17, a nut (not shown) is screwed on the bolt 18 and tightened, so that the lower side It is coupled to the horizontal structural member 17 via the base plate 20 .

As shown in FIG. 2, when a horizontal external force (seismic force) F due to an earthquake or the like acts on the load-bearing wall 10 configured as described above, 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 collapse, and the deformable portion 15 undergoes shear deformation to absorb the energy of the external force (seismic force). As a result, the ability of the load-bearing wall 10 to absorb seismic energy can be enhanced, and the earthquake-resistant performance of the load-bearing wall 10 can be improved.

As described above, according to the present embodiment, the deformable portion 15 provided in the web 12 of the H-section steel 11 and capable of absorbing energy between the openings 14, 14 adjacent in the longitudinal direction. The portion of the H-shaped steel 11 excluding the opening 14 and the deformable portion 15 is a vertical frame portion 16 extending vertically, and the upper and lower ends of the vertical frame portion 16 have a horizontal structure. Since it is joined to the members 17, 17, the number of parts is reduced and the processing labor is reduced as compared with the conventional art. Therefore, it is possible to provide a load-bearing wall that exerts stable seismic performance while reducing the number of machining and parts.
In addition, since the portions between the openings 14, 14 adjacent in the longitudinal direction of the web 12 are the deformable portions 15, the deformable portions 15 can be arranged at a plurality of positions in the web 12 in the longitudinal direction. Therefore, it is possible to avoid the concentration of shear deformation and rotational deformation on a specific portion of the web 12 in the longitudinal direction.
Furthermore, since the vertical frame portion 16 and the deformable portion 15 are integrated with the H-shaped steel 11 to form a compact load-bearing wall 10, it is possible to cope with a narrow load-bearing wall.

Further, the vertical height dimension of the H-shaped steel 11 is L (mm), the number of deformable portions 15 is n (n is a natural number), and the vertical width dimension 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 bearing wall 10, the plurality of deformable portions 15 are deformed by the energy of the external force. , fully absorbable.

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 yield strength of the vertical frame portion 16 is increased while the yield 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 central portion of the web 12 in the direction perpendicular to the longitudinal direction, the energy absorption performance of the deformable portion 15 can be improved. can be done.

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

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

Further, the portion between the openings 14, 14 adjacent to each other in the longitudinal direction of the web 12 (vertical direction in FIG. 3(a)) is a load-bearing wall where an external force is applied in the event of an earthquake or the like, as in the first embodiment. 10, the deformable portion 15 is capable of absorbing the energy of the external force.
Furthermore, in the present embodiment, a similar deformable portion 15 is formed between the opening 14 and the opening 14A that are vertically adjacent to each other. 3(a) and 4, the deformable portion 15 is painted with light ink.

Moreover, the width dimension of the deformable portion 15 in the longitudinal direction of the H-section steel 11 gradually decreases toward the central portion of the web 12 in the direction orthogonal to the longitudinal direction, as in the first embodiment. That is, similarly to the first embodiment, the lower edge of the opening 14 located on the upper side is formed in a downwardly convex semicircular shape, and the upper edge of the opening 14 located on the lower side is formed in an upwardly convex semicircular shape. Due to the arc shape, the width dimension of the deformable portion 15 in the longitudinal direction gradually decreases toward the central portion of the web 12 in the direction perpendicular 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 formed upwardly. By forming a convex triangular shape, the width dimension of the deformable portion 15 in the longitudinal direction may gradually decrease toward the central portion of the web 12 in the direction orthogonal to the longitudinal direction.
Also in the first embodiment, 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 in the lower side is formed in an upwardly convex triangular shape. By doing so, the width dimension of the deformable portion 15 in the longitudinal direction may gradually decrease toward the central portion of the web 12 in the direction perpendicular to the longitudinal direction.
In addition, the vertical height dimension of the H-shaped steel 11 is L (mm), the number of deformable portions 15 is n (n is a natural number), and the minimum vertical width dimension of the deformable portion 15 is S (mm ), n×S/L=1/50 to 1/10 as in the first embodiment.
The downwardly convex triangular shape of the lower edge and the upwardly convex triangular shape of the upper edge of the opening 14 may be a downwardly convex trapezoidal shape and an upwardly convex trapezoidal shape with a flat tip. In this case, the width dimension of the deformable portion 15 gradually decreases toward the central portion, but does not gradually decrease in the vicinity of the central portion and becomes uniform.

Further, as shown in FIG. 3(a), in the present embodiment, the upper end of the web 12 of the H-shaped steel 11 is provided with a notch 12a communicating with the uppermost opening 14A. 12 is provided with a notch 12a communicating with the lowest opening 14A, the vertical frame 16 extends vertically in a direction perpendicular to the longitudinal direction of the H-shaped steel 11. It is composed of a pair of left and right vertical members 16a, 16a that are spaced apart from each other. The vertical member 16a is located outside the openings 14, 14A and the deformable portion 15 in the width direction of the H-shaped steel 11, and is composed of a web piece having a width of about ⅓ of the width of the web 12 and one flange 13. ing.

Upper and lower end portions of a pair of left and right vertical members 16a, 16a forming the vertical frame portion 16 are coupled to horizontal structural members 17, 17 via base plates 21, 21, respectively.
That is, base plates 21, 21 are respectively fixed by welding to the upper and lower ends of one vertical member 16a, and base plates 21, 21 are respectively fixed by welding to the upper and lower ends of the other vertical member 16a.
The base plate 21 is made of steel and has a rectangular plate shape. Its long sides are shorter than the width H of the H-section steel 11, and its short sides are shorter than the width B of the flange 13 of the H-section steel 11. longer and shorter than the width of the flange 17a of the horizontal structural member 17.
The base plates 21, 21 are spaced apart from each other in the left and right direction, and the notch 12a is located between them.
Further, the base plate 21 is provided with a total of four bolt insertion holes at positions sandwiching the flange 13 of the vertical member 16a in the thickness direction of the flange 13 in plan view.

Then, the upper ends of the pair of left and right vertical members 16a, 16a of the vertical frame portion 16 abut the base plates 21, 21 provided at the upper ends against the lower flange 17a of the upper horizontal structural member 17, After inserting the bolt 18 through the bolt insertion holes provided in the base plates 21 and 21 and the bolt insertion holes provided in the lower flange 17a of the upper horizontal structural member 17, a nut (not shown) is attached to the bolt 18. It is connected to the upper horizontal structural member 17 via the base plates 21, 21 by screwing and tightening.
In addition, the lower ends of the pair of left and right vertical members 16a, 16a of the vertical frame portion 16 contact the upper flanges 17a of the lower horizontal structural member 17 with the base plates 21, 21 provided at the lower ends thereof. After inserting the bolt 18 through the bolt insertion holes provided in the base plates 21 and 21 and the bolt insertion holes provided in the upper flange 17a of the lower horizontal structural member 17, nuts (not shown) are attached to the bolts 18. ) to the lower horizontal structural member 17 via the base plates 21, 21 by screwing and tightening.

As shown in FIG. 4, when a horizontal external force (seismic force) F due to an earthquake or the like acts on the load-bearing wall 10A having such a configuration, 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 collapse, and the deformable portion 15 undergoes shear deformation to absorb the energy of the external force (seismic force). As a result, the seismic performance of the load-bearing wall 10A can be improved.

According to this embodiment, the following effects can be obtained in addition to the same effects as those of the first embodiment.
That is, a notch 12a communicating with the uppermost opening 14A is provided at the upper end of the web 12, and a notch 12a communicating with the lowermost opening 14A is provided at the lower end of the web 12. is provided, the vertical frame portion 16 is configured by a pair of vertical members 16a, 16a that extend vertically and are spaced apart in a direction orthogonal to the longitudinal direction of the H-shaped steel 11, so that the pair of vertical A plurality of deformable portions 15 connecting a pair of vertical members 16a, 16a smoothly undergo shear deformation without restraining the relative deformation of the members 16a, 16a, thereby stabilizing energy absorption against external forces such as seismic force. can be done.

(Third Embodiment)
FIG. 6 is a front view showing the load-bearing wall 10B of the third embodiment. The load-bearing wall 10A of the present embodiment differs from the load-bearing wall 10A of the second embodiment in the configuration of the openings 14 and 14A. The same reference numerals may be given to the same configurations, and the description thereof may be omitted.

In this embodiment, the openings 14 and 14A are burred. By this burring process, burring projections 22 projecting in the out-of-plane direction of the web 12 along the edges of the openings 14 and 14A are formed. All the burring projections 22 may protrude in the out-of-plane direction from one plate surface of the web 12, or some of the plurality of burring projections 22 may protrude in the out-of-plane direction from one plate surface. , the remaining burring projections 22 may protrude in the out-of-plane direction from the other plate surface.
Such burring projections 22 may be formed in the openings 14 in the first embodiment.

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

10, 10A, 10B Bearing wall 11 H-shaped steel (metal member)
12 Web 12a Notch 13 Flange 14, 14A Opening 15 Deformable Part 16 Vertical Frame 16a Vertical Member 17 Horizontal Structural Member

Claims (6)

A metal member having a web and a flange connected perpendicularly to the web is arranged with its longitudinal direction directed vertically, and the upper and lower ends are connected to horizontal structural members arranged above and below the metal member. a load-bearing wall that is
The web is provided with one opening in a direction orthogonal to the longitudinal direction and a plurality of openings 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 that extends vertically,
Upper and lower ends of the vertical frame are coupled to the horizontal structure ,
The upper end of the web is provided with a notch communicating with the uppermost opening, and the lower end of the web is provided with a notch communicating with the lowermost opening. A load-bearing wall, wherein the vertical frame portion is composed of a pair of vertical members extending vertically and spaced apart in a direction orthogonal to the longitudinal direction. Let L (mm) be the height dimension of the metal member in the vertical direction, n (n is a natural number) the number of the deformable portions, and S (mm) be the width dimension of the deformable portion in the vertical direction,
2. The load-bearing wall according to claim 1, wherein n×S/L=1/50 to 1/10. 3. The load-bearing wall according to claim 1 , wherein the height dimension of the opening in the longitudinal direction is larger than the width dimension in the direction orthogonal to the longitudinal direction. 4. The web according to any one of claims 1 to 3 , wherein the width dimension of the deformable portion in the longitudinal direction gradually decreases toward the central portion of the web in a direction orthogonal to the longitudinal direction. bearing wall. The load-bearing wall according to any one of claims 1 to 4 , wherein the opening is burred. The load-bearing wall according to any one of claims 1 to 5 , wherein the metal member has a flange strength higher than a web strength.

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