JP7308339B2 - bearing wall - Google Patents

Description

The present invention relates to load-bearing walls.

A load-bearing wall is installed at a predetermined position of a building to resist horizontal forces acting on the building, thereby contributing to improvement of the earthquake resistance of the building. As such a load-bearing wall, there is a wall made of reinforced concrete formed so as to shield the inside of the beam-column frame. Reinforced concrete walls block the inner space of the beam-column structure, which limits the degree of design freedom and lighting. Therefore, Patent Literature 1 discloses a quake-resistant wall that includes a lattice that forms a plurality of openings by combining diagonal members, and buckling stiffeners made of glass plates that are arranged in the openings of the lattice. ing. The earthquake-resistant wall of Patent Document 1 uses a glass plate as a buckling stiffener, so although it is easy to let in light, it requires sashes, screws, joint materials, etc. for fixing the glass plate, and the number of members is increased. many. Moreover, in the earthquake-resistant wall of Patent Document 1, it is necessary to provide buckling stiffeners for all the openings. Therefore, construction takes time. In the load-bearing wall of Patent Document 1, the buckling stiffener is supported at points with a gap between the stiffener and the diagonal member. The load is reduced until it comes into contact with the buckling stiffener, resulting in an unstable state (see FIG. 8). Furthermore, since glass is a brittle material and vulnerable to impact, a large safety factor must be taken in order to prevent a sudden drop in yield strength.

Japanese Unexamined Patent Application Publication No. 2012-041700

An object of the present invention is to propose a load-bearing wall that can be formed relatively easily and that can reduce labor and costs during construction.

In order to solve the above-mentioned problems, the present invention provides a load-bearing wall provided in a beam-column frame of a building, comprising a lattice formed by intersecting steel diagonal members and a steel diagonal member sandwiching the steel diagonal members. with installed wooden stiffeners. The stiffeners provided in the intersecting direction are joined at intersections of the lattice, and the lattice is fixed to the beam-column structure. In addition, it is desirable that the ends of the grid are fixed to frame members fixed to the inner peripheral surface of the beam-column structure.
According to such a load-bearing wall, since wooden members are used as stiffeners, labor and material costs during construction can be reduced. In addition, if wood is used as a structural member, it is possible to expect an effect of reducing carbon dioxide (CO ₂ ) emissions. Furthermore, although wood has a specific gravity of about 1/3 that of glass, it is a material that is ductile against compressive stress and bending stress. .

According to the load-bearing wall of the present invention, wooden members are used as the stiffeners arranged in the openings of the lattice, so that it can be installed without requiring a sash or the like. Therefore, the load-bearing wall can be formed relatively easily, making it possible to reduce labor and costs during construction.

It is a front view which shows the load-bearing wall which concerns on 1st embodiment. FIG. 4 is an exploded perspective view showing joints between diagonal members of a lattice; FIG. 10 is an exploded perspective view showing the joint state between the lattice and the stiffener. It is a front view which shows the load-bearing wall which concerns on 2nd embodiment. FIG. 4 is an exploded view of a grid; It is an enlarged view which shows the joint condition of a grid|lattice and a stiffener. FIG. 11 is a front view showing a load-bearing wall according to another embodiment; 10 is a graph showing the relationship between the load and displacement of the load-bearing wall of Patent Document 1. FIG.

<First embodiment>
In the first embodiment, as shown in FIG. 1, a beam-column structure is constructed by columns 21, 21 erected on the left and right sides, and beams 22, 22 horizontally extending above and below the columns 21, 21. The load-bearing wall 1 arranged in the inner space of 2 will be described. The load-bearing wall 1 includes a first diagonal member 31 and a second diagonal member 32 that intersect (hereinafter referred to as "first diagonal member 31" and "second diagonal member 32", simply "diagonal members 31, 32 ), a frame member 4 surrounding the periphery of the grid 3 , and stiffeners 5 arranged in the openings 33 of the grid 3 .

The lattice 3 is constructed by combining a first diagonal member 31 arranged at an angle of 45° with respect to the beam 22 and a second diagonal member 32 arranged at an angle of 135° with respect to the beam 22. It is That is, the first diagonal member 31 and the second diagonal member 32 are orthogonal to each other. The inclination angles of the first diagonal member 31 and the second diagonal member 32 are not limited and may be determined as appropriate. That is, the openings of the grid 3 are not limited to squares or rectangles, and may be vertically long rhombuses or horizontally long rhombuses. The first diagonal members 31 and the second diagonal members 32 are made of plate-shaped steel materials (so-called flat bars), and are arranged in parallel at equal intervals. The diagonal members 31 and 32 are arranged so that the plate surfaces face the inner peripheral surface of the beam-column frame 2 . That is, the adjacent first diagonal members 31 or the adjacent second diagonal members 32 are arranged with a gap therebetween with their plate surfaces facing each other. A slit 34 is formed in each of the first diagonal member 31 and the second diagonal member 32, as shown in FIG. The slit 34 is a recessed notch formed at a position where the first diagonal member 31 and the second diagonal member 32 intersect, and has the same width as the thickness of the diagonal member 31 and the diagonal member 32. , 32 (the length in the wall thickness direction). The first diagonal member 31 and the second diagonal member 32 form the lattice 3 by meshing the slits 34 of each other. The first diagonal member 31 and the second diagonal member 32 are welded together at the intersection (the portion where the slits 34 mesh). Both ends of the diagonal members 31 and 32 are welded to the inner surface of the frame member 4 . In addition, the structure of the first diagonal member 31 and the second diagonal member 32 is not limited, and it is not always necessary to have a joint structure in which the slits 34 are meshed with each other.

As shown in FIG. 1, the frame member 4 is formed in a rectangular shape in front view by combining a pair of left and right vertical members 41 and a pair of upper and lower horizontal members 42 . The vertical member 41 and the horizontal member 42 are made of plate-shaped steel (so-called flat bar). The vertical member 41 and the horizontal member 42 are arranged such that the plate surface (outer surface) faces the inner peripheral surface of the beam-column frame 2 . That is, the plate surface of the vertical member 41 is parallel to the inner surface of the column 21 , and the plate surface of the horizontal member 42 is parallel to the inner surface of the beam 22 . The material forming the vertical members 41 and the horizontal members 42 is not limited to plate materials, and steel materials such as H-shaped steel and channel steel may be used, for example. A predetermined gap is formed between the frame member 4 and the beam-column frame 2 . A gap between the beam-column structure 2 and the frame member 4 is filled with a filler (such as mortar) 6 . A plurality of anchors 43 protrude from the outer peripheral surface of the frame member 4 , and anchors 23 are also planted on the inner peripheral surface of the beam-column frame 2 . The frame member 4 and the beam-column structure 2 are fixed to each other by fixing the anchors 23 and 43 to the filler material 6 .

As shown in FIG. 1, one stiffener 5 is provided for a plurality of openings 33 formed along the first diagonal member 31 or the second diagonal member 32 (arranged in a diagonal direction). placed in place. That is, the stiffeners 5 are arranged in a zigzag pattern (in a checkerboard pattern) with respect to the plurality of openings 33 of the lattice 3 . The opening 33 on the back side (rear side) of the face facing the is left open. The arrangement of the stiffeners 5 is not limited, and may be arranged in all the openings 33, for example. The stiffeners 5 are made of wooden blocks. The outer peripheral shape of the stiffener 5 is the same shape as the peripheral shape of the opening 33 . In addition, the stiffener 5 may be a plate material.

The stiffener 5 is fixed in a state in which a pair of opposing surfaces (the upper left surface and the lower right surface in FIG. 1) are in surface contact with a pair of adjacent first diagonal members 31 among the four surfaces of the outer periphery. It is fixed to the first diagonal member 31 by the fitting 7 (see FIG. 3). Another pair of opposing surfaces of the stiffener 5 (in FIG. 1, the upper right surface and the lower left surface) are in surface contact with the pair of adjacent second diagonal members 32, and the second diagonal members 32 are secured by the fixture 7. It is fixed to the diagonal member 32 . The number and arrangement of fixtures 7 for fixing stiffeners 5 to diagonal members 31 and 32 are not limited, and may be determined as appropriate. Further, the stiffeners 5 arranged on the outer periphery of the load-bearing wall 1 are fixed to the frame member 4 by a fixture while being in surface contact with the frame member 4 . The stiffeners 5 need only be fixed to the lattice 3 and need not necessarily be fixed to the frame member 4 . As shown in FIG. 3, the stiffeners 5 are made of cross-laminated lumber in which a plurality of wooden structural members are laminated so that the fibers are perpendicular to each other. It is arranged substantially parallel to the first diagonal member 31 and the fibers of the other sawn board (lamina) are substantially parallel to the second diagonal member 32 . The fixtures 7 are fixed to the stiffeners 5 perpendicular to the fibers of the stiffeners 5 . It is desirable to use a fastener having a high pull-out strength as the fastener 7, and in this embodiment, a full thread type long screw (screw) is used. The material constituting the fixture 7 is not limited, and may be, for example, a bolt or a half screw type long screw.

As described above, according to the load-bearing wall 1 of the first embodiment, since the steel plates (oblique members 31 and 32) are used flat and obliquely provided, the lattice 3 serves as a brace that bears both compressive and tensile loads. Function. In addition, since the wooden stiffeners 5 are arranged in the openings 33 of the lattice 3, and the lattice 3 and the stiffeners 5 are fixed by fasteners 7 such as screws and bolts, the lattice 3 is prevented from buckling. suppressed.
In addition, since a ductile wooden member is used as the stiffener 5, interlaminar deformation of the load-bearing wall 1 progresses, and even if excessive stress acts on the stiffener 5, it will break brittlely. It is possible to provide toughness to the bearing wall 1 without having to Although wood has a relatively small specific gravity (for example, about 1/3 that of glass), it has ductility against compressive stress and bending stress, and is brittle and difficult to break. In addition, by using wood as the stiffener 5, reduction of carbon dioxide (CO ₂ ) emissions can be expected. Since the stiffeners 5 are made of wood, even if a dimensional error occurs when the lattice 3 or the stiffeners 5 are manufactured, it can be corrected relatively easily. In addition, since cross-laminated lumber is used as the stiffener, there is little difference in rigidity and strength between the two intersecting directions, and directionality in the stiffening effect is less likely to occur.

Further, since the stiffeners 5 are directly fixed to the lattice 3 by the fixtures 7, sashes, joints, and the like are not required. Therefore, the number of parts is small, and it is economical and requires little labor during construction.
Further, since the stiffeners 5 are fastened to the lattice 3 by the fasteners 7, they can also resist tensile forces. Therefore, when the stiffener 5 is fixed only to one side of the diagonal members 31 and 32, the force of buckling the diagonal members 31 and 32 on the side opposite to the surface on which the stiffener 5 is fixed is Even if it acts, buckling can be suppressed by the tensile resistance of the stiffener 5 via the fixture 7 . Since the fasteners are fixed perpendicular to the fibers, the strength and integrity of the joints (separation resistance due to the tightening force of screws and bolts) are increased, and the stiffeners are less likely to be damaged by the fasteners.

<Second embodiment>
In the second embodiment, as shown in FIG. 4, a beam-column structure is constructed by columns 21, 21 erected on the left and right sides, and beams 22, 22 horizontally extending above and below the columns 21, 21. The load-bearing wall 1 arranged in the inner space of 2 will be described. The load-bearing wall 1 includes a lattice 3 in which a plurality of openings 33 are formed by crossing diagonal members 31 and 32, a frame member 4 surrounding the circumference of the lattice 3, and stiffening members provided in the openings 33 of the lattice 3. material 5; Since the details of the frame member 4 are the same as those of the frame member 4 of the first embodiment, detailed description thereof will be omitted.

The lattice 3 is constructed by combining a first diagonal member 31 arranged at an angle of 45° with respect to the beam 22 and a second diagonal member 32 arranged at an angle of 135° with respect to the beam 22. It is That is, the first diagonal member 31 and the second diagonal member 32 are orthogonal to each other. The inclination angles of the first diagonal member 31 and the second diagonal member 32 are not limited and may be determined as appropriate. The first diagonal members 31 and the second diagonal members 32 are made of plate-shaped steel materials (so-called flat bars), and are arranged in parallel at equal intervals. The diagonal members 31 and 32 are arranged so that the plate surfaces face the inner peripheral surface of the beam-column frame 2 . That is, the adjacent first diagonal members 31 or the adjacent second diagonal members 32 are arranged with a gap therebetween with their plate surfaces facing each other. As shown in FIG. 5, the first diagonal member 31 has a length that is 1, 3 or 4 times the interval between the second diagonal members 32, and both ends of the first diagonal member 31 are frame members. 4 is fixed (welded). On the other hand, the second diagonal members 32 have the same length as the interval between the first diagonal members 31 , and both ends of the second diagonal members 32 are fixed (welded) to the first diagonal members 31 . Both ends of the second diagonal member 32 whose plate surface faces the corner of the load-bearing wall 1 are fixed to the first diagonal member 31 and the frame member 4 . The end of the second diagonal member 32 facing the other frame members 4 on the side of the frame member 4 is fixed to the first diagonal member 31 and the frame member 4 . In addition, the structure of the first diagonal member 31 and the second diagonal member 32 is not limited.

As shown in FIG. 4 , the stiffeners 5 are frame-shaped by combining a plurality of wooden plates (frame-constituting plate members 51 ) and are arranged in the openings 33 . That is, the diagonal members 31 and 32 are sandwiched by the stiffeners 5 from above and below. The end of the frame-constituting plate member 51 is obliquely processed at 45° with respect to the longitudinal direction of the frame-constituting plate member 51 . A frame-shaped stiffener 5 having an internal angle of 90° is formed by joining four frame-constituting plate members 51 with their butt ends facing each other. The angle of the ends of the frame-constituting plate members 51 is not limited. The angles should be the same. Moreover, the ends of the frame-constituting plate members 51 do not necessarily have to be in contact with each other, and may have a gap. Also, the frame-constituting plate members 51 do not necessarily have to be fixed to each other. The frame-constituting plate member 51 is fixed to the diagonal members 31 and 32 via the fixture 7 while being in surface contact with the plate surfaces of the diagonal members 31 and 32 . The frame-constituting plate member 51 is arranged so that the axial direction of the diagonal members 31 and 32 that are in surface contact with the direction of the fiber is substantially parallel. The fiber direction of the frame-constituting plate member 51 does not necessarily have to be parallel to the diagonal members 31 and 32 . As shown in FIG. 6 , the upper and lower frame-constituting plate members 51 sandwiching the same diagonal members 31 and 32 are fixed by the same fixture 7 . The fixture 7 is perpendicular to the fibers of the frame-constituting plate material 51 . It is desirable to use fasteners 7 having high pull-out strength, and bolts are used in this embodiment. The material constituting the fixture 7 is not limited, and may be, for example, a long screw of a half screw type or a long screw of a full screw type. Further, the frame-constituting plate members 51 arranged above and below the diagonal members 31 and 32 do not necessarily have to be fixed by the same fixture 7, and may be individually fixed to the diagonal members 31 and 32. FIG.

As described above, according to the load-bearing wall 1 of the second embodiment, since the steel plates (oblique members 31 and 32) are used flat and obliquely provided, the lattice 3 serves as a brace that bears both compressive and tensile loads. Function. In addition, since the wooden stiffeners 5 are arranged in the openings 33 of the lattice 3, and the lattice 3 and the stiffeners 5 are fixed by fasteners 7 such as screws and bolts, the lattice 3 is prevented from buckling. suppressed.
In addition, since a ductile wooden member is used as the stiffener 5, interlaminar deformation of the load-bearing wall 1 progresses, and even if excessive stress acts on the stiffener 5, it will break brittlely. It is possible to provide toughness to the bearing wall 1 without having to Further, since the stiffeners 5 are made of wood, even if a dimensional error occurs during the production of the lattice 3 and the stiffeners 5, it can be corrected relatively easily. In addition, by configuring the stiffeners 5 from wood, it is possible to reduce carbon dioxide (CO ₂ ) emissions.

Further, since the stiffeners 5 are directly fixed to the lattice 3 by the fixtures 7, sashes, joints, and the like are not required. Therefore, the number of parts is small, and it is economical and requires little labor during construction.
The stiffening member 5 is a piece of wood whose fiber direction is parallel to the diagonal members 31 and 32, and is fixed in a state in which the diagonal members 31 and 32 are sandwiched. Buckling of the diagonal members 31 and 32 can be effectively suppressed.
Between the frame-constituting plate members 51, there is no difference in composition or strength due to the difference in the fiber direction on the butt end surface, so that the frame-shaped stiffener 5 with excellent force transmission can be formed. Therefore, buckling of the lattice 3 (oblique members 31 and 32) can be effectively suppressed, and weakening of joints between the frame-constituting plate members 51 is suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and each component can be appropriately modified in design without departing from the gist of the present invention.
The load-bearing wall 1 may be attached to the existing beam-column frame 2 by post-construction, or may be installed in a newly constructed building.
Moreover, the load-bearing wall 1 may directly fix the frame member 4 to the beam-column structure 2 .
The angle and spacing of the diagonal members 31 and 32 forming the grating 3 are not limited and may be determined as appropriate.
In addition, by adjusting the plate thickness of the stiffeners 5 and selecting the material (type of wood) that constitutes the stiffeners 5, the bearing strength and rigidity required for the load-bearing wall 1 can be set. good too.
The material constituting the stiffener 5 is not limited to the cross laminated lumber, and for example, solid lumber, laminated lumber, and veneer laminated lumber may be used. Further, the stiffeners 5 do not necessarily have to be fixed to the diagonal members by fixtures perpendicular to the fibers. may
Moreover, the shape of the stiffener 5 is not limited to those shown in each of the above embodiments. For example, as shown in FIG. It may be in shape. The triangular stiffener 5 may be provided so as to shield the upper half or the horizontal half of the opening 33 .

1 bearing wall 2 beam-column structure 21 column 22 beam 23 anchor 3 lattice 31 first diagonal member 32 second diagonal member 33 opening 4 frame member 41 vertical member 42 horizontal member 43 anchor 5 stiffener 6 filler 7 fixture

Claims (2)

A load-bearing wall provided in the beam-column structure of a building,
a grid formed by intersecting steel diagonals;
a wooden stiffener installed to sandwich the steel diagonal,
At intersections of the grid, the stiffeners provided in the crossing direction are joined together,
A load-bearing wall, wherein the grid is fixed to the beam-column structure. 2. The load-bearing wall according to claim 1, wherein the ends of said lattice are fixed to frame members fixed to the inner peripheral surface of said beam-column structure.

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