JP7361561B2 - Brace mounting structure, structure and brace mounting method - Google Patents

Description

The present invention relates to a vibration damping brace that absorbs loads caused by earthquakes, etc., a mounting structure for the seismic brace that supports the load and improves the seismic resistance of structures, and the installation of structures using the same and vibration damping/earthquake resistant braces. Regarding the method.

In recent years, architectural structures such as buildings, warehouses, and stores absorb loads applied in the horizontal direction due to earthquakes (hereinafter referred to as earthquake energy), and the main structural members such as columns and beams of the architectural structures absorb Vibration braces are installed as vibration dampers to reduce damage, and seismic braces are installed to support loads and improve the earthquake resistance of structures. The damping/seismic brace is installed diagonally between the joint between the end of the column and the end of the beam and the reinforced concrete beam or floor slab. Vibration damping and seismic braces installed in this way suppress deformation of the building structure or stress on members by supporting horizontal loads caused by earthquakes, etc., thereby ensuring the rigidity of the building structure. It is supposed to be done. In addition, below, vibration control/seismic braces will be collectively referred to as braces.

Generally, in addition to braces using H-shaped steel or channel steel, buckling restraint braces that suppress buckling of members due to axial force in the compression direction are known. In particular, the buckling restraint brace is configured to include a stiffening member in addition to the axial member that a general brace has and a mounting member for joining the axial member to the main frame. The buckling restraint brace is compressed in the axial direction by the vibration of the building structure due to an earthquake, ie, the seismic energy applied in the horizontal direction. The axial compression of the buckling restraint brace is borne by the axial member of the buckling restraint brace. The buckling restraint brace includes a stiffening member that stiffens the deflection and buckling of the axial member so that the axial member is plastically deformed in the axial direction of the brace without buckling due to axial compression. The stiffener is provided so as to cover the periphery of the axial member as a buckling restraint material for the axial member without bearing the axial force input to the buckling restraint brace. Due to the structure described above, the buckling restraint brace prevents or delays the occurrence of buckling of the entire axial member even when compressive axial force is applied, produces stable axial deformation, and improves the ability to absorb earthquake energy. It is designed to increase the capacity to support the load.

Such braces are installed in building structures using mounting members provided at both ends. The brace is then fixed at one end to the junction of the column end and the beam end, and at the other end to the reinforced concrete beam or floor slab. At this time, the mounting member connected to the beam or the floor slab was fixed via an anchor bolt (see, for example, Patent Document 1 and Patent Document 2).

JP2017-82532A JP 2018-178433 Publication

However, as disclosed in Patent Document 1 and Patent Document 2, when the other end of the brace is fixed via an anchor bolt, there are the following disadvantages. That is, since many heads of the anchor bolts protrude from the surface of the beam or floor slab, there is a problem that the appearance of the floor surface of the building structure is spoiled. In addition, the head of the anchor bolt protrudes from the floor surface, making it difficult to place passages, equipment, or goods in that part, which limits the usage, so the internal space of the building structure is used. It was an obstacle in doing so. In addition, since a large number of long, small-diameter anchor bolts are used, there is a risk that the anchor bolts may be placed incorrectly, making it necessary to modify bolt holes or drill new holes when installing fixing members or braces. It was difficult to avoid troubles that would otherwise occur. Therefore, in order to install a large number of anchor bolts at accurate positions and heights, surveying, positioning, and fixing work using a frame are required, which increases the construction cost and lengthens the construction period for bolt installation. was there.

The present invention is intended to solve the above-mentioned problems, and eliminates the need for anchor bolts for fixing braces, making it possible to effectively utilize the internal space of a building structure without spoiling the appearance of the floor surface, and making it easier to install bolts. An object of the present invention is to provide a brace mounting structure, a structure, and a brace mounting method that can reduce the construction cost and suppress the lengthening of the construction period.

A brace mounting structure according to the present invention includes an axial member and mounting members respectively joined to both ends of the axial member in the axial direction, and installs the brace that receives an axial force on a building structure. In the brace mounting structure, one of the mounting members is attached to a fixed part installed in a reinforced concrete structure formed using reinforced concrete of the building structure, and The fixing part includes an anchor part that is buried in the reinforced concrete of the reinforced concrete structure and fixed to the building structure, and an anchor part that is erected from the anchor part toward the surface of the reinforced concrete structure and is integrated with the anchor part. and a vertical plate buried in the reinforced concrete structure, arranged in a direction crossing the surface of the reinforced concrete structure, one end connected to the vertical plate, and the other end connected to the one mounting member of the brace. and a gusset plate, wherein the anchor part is erected between an upper flange and a lower flange in the form of rectangular long plates arranged in a pair in the vertical direction, and between the upper flange and the lower flange, and and a rectangular long plate-shaped web connecting the lower flange, and is formed in an H shape and is disposed along the surface of the reinforced concrete structure, and the anchor part is connected to the upper flange and the lower flange. The flange further includes a rectangular reaction force plate disposed at or between both ends in the longitudinal direction of the flange and reinforcing the upper flange and the lower flange.

A structure using the brace attachment structure according to the present invention is provided with a brace fixed by the above-mentioned brace attachment structure.

A brace mounting method according to the present invention includes an axial member and mounting members respectively joined to both ends of the axial member in the axial direction, and installs a brace receiving an axial force on a building structure. A brace attachment method, comprising: installing an anchor part on the foundation of the building structure via a fixed frame; and installing reinforcing bars to the anchor part and a vertical plate erected to the anchor part. an assembling step, a step of pouring concrete into the foundation and burying the anchor portion and the vertical plate together, and a gusset plate arranged in a direction intersecting a surface portion formed by pouring the concrete. and a step of connecting one end of the gusset plate to the vertical plate, and a step of joining the other end of the gusset plate to the mounting member of the brace, and the anchor part is arranged in a pair in the vertical direction. A rectangular long plate-like upper flange and a lower flange arranged in a rectangular shape, and a rectangular long plate-like web erected between the upper flange and the lower flange and connecting the upper flange and the lower flange. The anchor part is formed in a shape and is arranged along the surface of a reinforced concrete structure part formed using reinforced concrete of the building structure, and the anchor part is located at both ends in the longitudinal direction of the upper flange and the lower flange. Alternatively, it further includes a rectangular reaction force plate arranged between both ends and reinforcing the upper flange and the lower flange .

According to the present invention, since the fixing part for fixing the brace is buried in reinforced concrete, there is no need for anchor bolts for fixing the brace, and the interior space of the building structure can be effectively utilized without spoiling the floor appearance. At the same time, it is possible to reduce the construction cost for bolt installation and to suppress the lengthening of the construction period.

FIG. 2 is a schematic diagram of an example of a structure in which the mounting structure for the brace 10 according to the first embodiment is used. 2 is a front view showing the mounting structure of the brace 10 of FIG. 1. FIG. FIG. 3 is a top view showing the mounting structure of the brace 10 in FIG. 2 when viewed from the AA direction. FIG. 3 is a top view showing the mounting structure of the brace 10 in FIG. 2 when viewed from the DD direction. 3 is an explanatory diagram showing a BB cross section of the mounting structure of the brace 10 in FIG. 2. FIG. FIG. 3 is an explanatory diagram showing a CC cross section of the mounting structure of the brace 10 in FIG. 2. FIG. FIG. 3 is a schematic diagram showing stress acting on the mounting structure of the brace 10 according to the first embodiment. 8 is an explanatory diagram showing a PP cross section of the mounting structure of the brace 10 in FIG. 7. FIG. 8 is an explanatory diagram showing a QQ cross section of the mounting structure of the brace 10 in FIG. 7. FIG. 5 is a flowchart showing a method for attaching the brace 10 according to the first embodiment. 7 is a front view showing a first modification of the mounting structure for the brace 10 according to the first embodiment. FIG. 7 is a front view showing a second modification of the mounting structure for the brace 10 according to the first embodiment. FIG. FIG. 7 is a front view showing a third modification of the mounting structure for the brace 10 according to the first embodiment. FIG. 7 is a front view showing a fourth modification of the mounting structure for the brace 10 according to the first embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a brace attachment structure, a structure, and a brace attachment method according to the present invention will be described with reference to the accompanying drawings. Note that the form of the drawings is an example and does not limit the present invention. Each figure is shown schematically, and the relative size, plate thickness, etc. of each member are not limited to the illustrated dimensions. Further, in the following drawings, the size relationship of each component may differ from the actual one. Further, in each figure, the same reference numerals are the same or equivalent, and this is common throughout the entire specification. Moreover, the forms of the constituent elements shown in the entire specification are merely examples, and the present invention is not limited to these descriptions.

Embodiment 1.
First, the mounting structure of the brace 10 according to the first embodiment will be explained using FIGS. 1 to 6. FIG. 1 is a schematic diagram of an example of a structure in which the brace 10 mounting structure according to the first embodiment is used. FIG. 2 is a front view showing the mounting structure of the brace 10 of FIG. 1. FIG. 3 is a top view showing the mounting structure of the brace 10 of FIG. 2 as viewed from the AA direction. FIG. 4 is a top view showing the mounting structure of the brace 10 of FIG. 2 as viewed from the DD direction. FIG. 5 is an explanatory diagram showing a BB cross section of the mounting structure of the brace 10 in FIG. 2. As shown in FIG. FIG. 6 is an explanatory diagram showing a CC cross section of the mounting structure of the brace 10 in FIG. 2. As shown in FIG.

As shown in FIG. 1, the mounting structure of the brace 10 according to the first embodiment is used for a structure having the following configuration, that is, an architectural structure 100 such as a building, a warehouse, a store, etc. Specifically, the building structure 100 consists of a footing 3 fixed to the ground 1 via piles 2, and reinforcement such as main reinforcing bars 41 and band reinforcing bars 42 (see FIG. 5), and then concrete being poured. It is formed on a foundation 5 constructed by a reinforced concrete beam 4 and a reinforced concrete beam 4. On the footing 3 of the foundation 5, a plurality of columns 6 are erected facing each other, and the lower ends are fixed to the footing 3. Then, a slab 7 is formed on the foundation 5 and becomes the floor of the structure. Furthermore, in the architectural structure 100, a beam 8 is constructed between the upper ends of a pair of pillars 6, 6 that are arranged to face each other. The upper ends of these pillars 6 and the ends of the beams 8 are joined. A joint member 9 to which a brace 10 is attached is provided at the joint between the column 6 and the beam 8. The building structure 100 configured in this manner is equipped with controls to absorb seismic energy applied in the horizontal direction due to earthquakes and the like, and to reduce damage to main structural members such as the columns 6 and beams 8 of the building structure 100. A brace 10 is installed diagonally as a vibration damper.

In the case of the first embodiment, the brace 10 includes an axial member 11 (see FIG. 2, etc.), a stiffener 12 that stiffens the axial member 11, and is arranged at both ends of the axial member 11 in the axial direction. , and a mounting member 13 for joining the axial member 11 to the main frame. In this case, the brace 10 is configured as a buckling restraining brace that suppresses member buckling due to axial force in the compression direction. The brace 10 includes a stiffening member 12 that stiffens the axial member 11 in addition to the axial member 11 and each attachment member 13, so that buckling of the member due to axial force in the compression direction can be suppressed. The brace 10 has a mounting member 13 at the lower end, which is one of the mounting members 13 provided at the upper and lower ends, on the surface of the reinforced concrete structure 50 formed on the reinforced concrete beam 4 of the building structure 100. It is attached to a fixing part 20 installed on a certain slab 7. Note that the reinforced concrete structure 50 in which the fixing part 20 is installed is not limited to the slab 7 that constitutes the floor surface of the building structure 100, but also a beam (reinforced concrete beam 4 or a reinforced concrete ceiling beam (not shown)). etc.), a portion including the reinforced concrete beam 4 and the slab 7, or a portion including the foundation 5 and the slab 7.

The fixing part 20 is buried in the center of the reinforced concrete beam 4 that supports the slab 7 from below between the lower ends of the columns 6, 6. In addition, the brace 10 has a connecting member 9 in which the mounting member 13 at the upper end, which is the other of the mounting members 13 provided at the upper and lower ends, is connected to the upper end of the column 6 and the end of the beam 8. can be attached to. The fixing part 20 includes a gusset plate 24, which will be described later, and the mounting member 13 provided at the lower end of the brace 10 is joined to the gusset plate 24. In this way, the brace 10 is disposed diagonally between the joint between the column 6 and the beam 8 and the fixing part 20 installed on the reinforced concrete beam 4 that supports the slab 7 from below.

(Brace 10)
As shown in FIGS. 1 and 2, the brace 10 includes, for example, a cylindrical axial member 11 and a cylindrical stiffener 12 that covers the outer periphery of the axial member 11. The central axis of the brace 10 is arranged concentrically with the central axis of the axial member 11. The central axes of the stiffeners 12 are likewise arranged concentrically. That is, the axial member 11 passes through the center of the cylindrical stiffener 12 in the longitudinal direction. The outer periphery of the axial member 11 is surrounded by the stiffening member 12, and deformation is restrained. An attachment member 13 at the upper end in the longitudinal direction of the axial member 11 is attached to a joining member 9 connected to the upper end of the column 6 and the end of the beam 8 by bolts or the like (not shown).

The upper end of the stiffener 12 in the longitudinal direction is connected to a mounting member 13 joined to the axial member 11 . Thereby, the upper end of the stiffener 12 is fixed so as not to be displaced relative to the mounting member 13. Further, a lower end portion in the longitudinal direction of the axial member 11 is joined to a mounting member 13. The lower end portion of the stiffener 12 is configured to be able to be displaced relative to the axial member 11 and the attachment member 13. A predetermined gap is formed between the inner surface of the stiffener 12 and the outer peripheral surface of the axial member 11. Therefore, even if the axial member 11 expands or contracts when a load due to deformation of the building structure 100 is applied to the brace 10, the stiffener 12 is configured so that no load is applied in the central axis direction. The attachment member 13 at the lower end in the longitudinal direction of the axial member 11 attaches the brace 10 to a fixing part 20 (more specifically, an anchor part 21 It serves as a joint for joining with a gusset plate 24) buried in the reinforced concrete beam 4.

(Axial material 11)
The axial member 11 is an elongated steel material with a cylindrical cross section. In the first embodiment, the axial member 11 is shown as a long steel member with a cylindrical cross section, but the axial member 11 is, for example, a steel bar or a flat plate joined to have a cross section. The cross-sectional shape taken along a plane perpendicular to the central axis of the brace 10 is not limited. Attachment members 13 are joined to the upper and lower ends of the axial member 11 in the longitudinal direction.

The axial member 11 is formed of a plastically deformable material, and absorbs the energy input to the brace 10 when the axial member 11 plastically deforms, thereby achieving higher earthquake resistance and a vibration damper effect.

(Stiffener 12)
The stiffener 12 is, for example, a steel pipe with a cylindrical cross section, and has a structure in which the axial member 11 is passed through the inside of the pipe. Note that the stiffener 12 is not limited to a cylindrical shape. For example, a rectangular tube with a rectangular cross section may be used as long as the deflection can be restrained so that the axial force member 11 does not buckle when the axial force member 11 is deflected by the axial force. The longitudinal dimension of the stiffener 12 is desirably longer than the longitudinal dimension of the axial member 11 . Further, mortar or the like may be filled between the axial member 11 and the stiffening member 12 for stiffening. Furthermore, the stiffening member 12 may be formed by joining a plurality of square steel pipes to restrain the deflection of the axial member 11. The structure of the stiffener 12 can be changed as appropriate depending on the shape and deflection of the axial member 11.

(Fixed part 20)
Specifically, as shown in FIG. 2, the fixing part 20 includes an anchor part 21, a vertical plate 22, a top plate 23, and a gusset plate 24, and is installed on the ground 1. It is arranged on the upper surface of leveled concrete 1A via a fixed frame 30. The anchor part 21 is buried within the reinforced concrete beam 4 and fixed to the building structure 100. The vertical plate 22 is erected from the anchor part 21 toward the slab 7, and is buried integrally with the anchor part 21. Further, the gusset plate 24 is arranged in a direction crossing the slab 7, one end is connected to the vertical plate 22, and the other end is connected to one of the braces 10, that is, the mounting member 13 at the lower end. has been done.

At this time, it is preferable that the gusset plate 24 further includes an upper surface plate 23 connected to the end of the vertical plate 22 located on the slab 7 side and arranged substantially parallel to the slab 7. In that case, the gusset plate 24 is connected to the vertical plate 22 via the top plate 23, thereby improving the bonding strength with the anchor portion 21.

(Anchor part 21)
The anchor part 21 includes an upper flange 211 and a lower flange 212 arranged in the vertical direction in the form of a rectangular long plate, and a web 213 in the form of a rectangular long plate erected between the upper flange 211 and the lower flange 212. It is formed into an H-shape. These upper flange 211 and lower flange 212 and web 213 are joined by welding or the like. The anchor portion 21 is arranged along the slab 7 between the lower ends of the columns 6 , 6 .

Further, in the anchor portion 21, reaction plates 214 are installed at both ends in the longitudinal direction of the upper flange 211, the lower flange 212, and the web 213, respectively, and are joined by welding or the like. At this time, as shown in FIGS. 3 and 5, the reaction plate 214 has a horizontal dimension larger than the widthwise dimension of the upper flange 211 and the lower flange 212, and a vertical dimension larger than the lateral dimension of the upper flange 211 and the lower flange 212. It is formed larger than the dimension between 212 and 212. This makes it possible to resist external forces applied from the outside (for example, horizontal reaction force HR from concrete (see FIG. 7), which will be described later).

Further, in the anchor portion 21, stiffening ribs 215 arranged along the longitudinal direction of the web 213 are joined to both ends of the web 213 at which the reaction plates 214 are provided by welding or the like. In this case, the stiffening ribs 215 are spaced apart above and below the web 213 in the vertical direction. This makes it possible to further increase the rigidity of the web 213, particularly against external forces (for example, horizontal reaction force HR from concrete (see FIG. 7), which will be described later) applied to both ends in the longitudinal direction.

Further, as shown in FIGS. 2, 3, and 6, the anchor part 21 has a rectangular shape at the middle part in the longitudinal direction of the upper flange 211, the lower flange 212, and the web 213 to reinforce the upper flange 211 and the lower flange 212. A flat stiffening plate 216 is installed. Stiffening plate 216 is joined to upper flange 211, lower flange 212, and web 213 by welding or the like. Thereby, the rigidity of the anchor portion 21 can be further increased.

(Vertical plate 22)
As shown in FIGS. 2, 3, 5, and 6, the vertical plate 22 has one end joined to the upper flange 211 of the anchor part 21 by welding or the like, and is erected toward the slab 7. . Further, the other end of the vertical plate 22 is joined to the top plate 23 by welding or the like. A reinforcing bar hole 22a is formed in the vertical plate 22, through which the reinforcing bar (band reinforcing bar 42) of the reinforced concrete beam 4 is inserted. The vertical plate 22 is embedded in the reinforced concrete beam 4 together with the anchor part 21. Note that the vertical plate 22 may be joined to the gusset plate 24 by welding or the like without using the upper plate 23. Further, the vertical plate 22 and the web 213 of the anchor portion 21 may be formed integrally. Thereby, compared to the case where the vertical plate 22 is provided separately, it is possible to save labor in manufacturing the fixing part 20.

(Top plate 23)
The upper surface plate 23 has a rectangular long plate shape, and has one surface joined to the other end of the vertical plate 22, and the other surface joined to one end of the gusset plate 24. In the top plate 23, the vertical plate 22 and the gusset plate 24 are joined by welding or the like. By providing this upper surface plate 23, the vertical plate 22 and the gusset plate 24 can be joined much more easily than when the vertical plate 22 and the gusset plate 24 are joined without using the upper surface plate 23.

(Gusset plate 24)
As shown in FIGS. 2 and 5, the gusset plate 24 has one end, that is, the lower end, joined to the top plate 23 connected to the vertical plate 22 by welding or the like. Further, the other end, that is, the upper end of the gusset plate 24 is attached to the attachment member 13 disposed at the lower end of the brace 10 by the attachment plate 14 and the high-strength bolt 15, and is integrally formed. It is joined. In this way, in the case of the first embodiment, the gusset plate 24 is joined to the top plate 23 of the fixing part 20 buried in the reinforced concrete beam 4 by welding or the like. Therefore, anchor bolts (not shown) for fixing the brace 10 are not required, and the internal space of the building structure 100 can be effectively utilized without spoiling the appearance of the floor surface. At the same time, it is possible to reduce the construction cost for bolt installation and to suppress the lengthening of the construction period.

(Fixed frame 30)
Here, the fixing portion 20 as described above is installed via a fixing frame 30 installed on the leveled concrete 1A. As shown in FIGS. 1, 2, and 4, the fixed frame 30 includes a plurality of columnar members 31 that are vertically erected and arranged to face each other, and the upper ends of the opposing columnar members 31 in the longitudinal direction. A plurality of beam-like members 32 that join the sections and lower ends thereof, and a plurality of square members 33 that join the upper ends and lower ends of the opposing columnar members 31 in the transverse direction. There is. Each of the square members 33 is set to have a shorter length than the beam-like member 32. The plurality of beam-like members 32 are arranged vertically above and below, respectively, along the longitudinal direction of the anchor portion 21 . Further, the plurality of square members 33 are arranged so as to connect the ends of the plurality of beam-like members 32 in the longitudinal direction and the ends in the vertical direction, respectively. These columnar members 31, beam-like members 32, and square members 33 are joined by adhesion, welding, or the like. Further, a reinforcing member 34 disposed parallel to the square beam 33 may be provided between the horizontally opposing beam-like members 32, 32. In addition, in the fixed frame 30, the above-mentioned columnar members 31, beam-like members 32, and square members 33 are not limited to the prismatic shapes, but may be constructed using mountain-shaped angles. Moreover, the beam-like member 32 may be arranged only in the upper part of the upper part and the lower part in the vertical direction. In short, when embedding and fixing the fixing part 20 in the reinforced concrete beam 4, the shape, material, overall shape, etc. of each component can be determined as appropriate, as long as the fixing part 20 can be held in the installed position. , can be selected.

(Explanation of stress acting on fixed part 20)
Next, stress acting on the fixed portion 20 configured in this manner will be explained using FIGS. 7 to 9. FIG. 7 is a schematic diagram showing stress acting on the mounting structure of the brace 10 according to the first embodiment. FIG. 8 is an explanatory diagram showing a PP cross section of the mounting structure of the brace 10 in FIG. 7. FIG. 9 is an explanatory diagram showing a QQ cross section of the mounting structure of the brace 10 in FIG. 7.

When two braces 10, 10 are installed on one frame that constitutes the architectural structure 100 using the fixing part 20 configured as described above, it is desirable to arrange them as follows. For example, as shown in FIG. 7, when two braces 10, 10 are installed on one frame constituting the building structure 100, the center of the anchor part 21 is aligned with the axis of the two braces 10, 10. It is desirable to place it at intersection O. By arranging the braces 10, 10 at the intersection O of their axes in this way, it is possible to effectively absorb seismic energy applied to the building structure 100 in the horizontal direction due to an earthquake or the like.

Specifically, as shown in FIGS. 7 to 9, when seismic energy is applied to the building structure 100 in the horizontal direction due to an earthquake or the like, the building structure 100 also vibrates and the frame deforms. The brace 10 expands and contracts due to the application of compressive axial force W1 and tensile axial force W2 indicated by white arrows in the figure due to deformation of the frame, and absorbs energy caused by vibration. Energy due to vibration is absorbed by plastically deforming the axial member 11 of the brace 10. As the brace 10 absorbs energy due to vibration, vibrations affecting the columns 6 and beams 8 are attenuated.

At this time, the compressive axial force W1 and the tensile axial force W2 acting on the brace 10 are transmitted to the anchor portion 21 via the gusset plate 24, the upper surface plate 23, and the vertical plate 22. As a result, a vertical force N, a horizontal force H, and a bending moment M act on the anchor portion 21. A horizontal reaction force HR acts on the reaction force plate 214 from the reinforced concrete beam 4 in opposition to the horizontal force H. A vertical reaction force NRU acts on the outer surface of the upper flange 211 from the reinforced concrete beam 4 in opposition to the vertical force N. A vertical reaction force NRL acts on the outer surface of the lower flange 212 from the reinforced concrete beam 4 in opposition to the vertical force N. In addition, in opposition to the bending moment M, a bending resistance force acts due to the concrete reaction force distribution shape of the vertical reaction force NRU on the outer surface of the upper flange 211 and the vertical reaction force NRL on the outer surface of the lower flange 212. As described above, the anchor part 21 has an H-shaped cross section formed by the upper flange 211, the lower flange 212, and the web 213, and the vertical force N and bending moment M acting on the anchor part 21 are This ensures rigidity and strength. Moreover, by installing the fixing part 20 so that the center point of the anchor part 21 is located at the point O where the axes of the two braces 10 intersect, the bending moment M will not act on the anchor part 21. As a result, the anchor part 21 can be designed to resist the vertical force N and the horizontal force H, so the cross section and length of the fixing part 20 can be reduced, and costs can be reduced.

Note that the number and position of the braces 10 installed in the architectural structure 100 shown in FIG. 1 are merely examples, and can be changed as appropriate.

(Method of attaching brace 10 according to Embodiment 1)
Here, the brace 10 installed in the architectural structure 100 shown in FIG. 1 is constructed by the following procedure shown in FIG. 10, that is, the method for attaching the brace 10. Hereinafter, a method for attaching the brace 10 will be explained using FIG. 10. FIG. 10 is a flowchart showing a method for attaching the brace 10 according to the first embodiment.

As shown in FIG. 10, first, the fixed frame 30 is installed on the upper surface of the leveled concrete 1A on the ground 1 on which the footing 3 is formed (step S1). At this time, by fixing the beam-like member 32 and the square timber 33 at the lower end of the fixed frame 30 to the upper surface of the leveled concrete 1A on the ground 1 after level confirmation with fixing bolts 35, the fixed frame 30 can be moved. or embedding (lowering) into the ground 1. Further, after fixing the fixing frame 30 with the post-fixing bolts 35, the level and position are checked again.

Next, the anchor part 21, the vertical plate 22, and the top plate 23 are attached by welding to the fixed frame 30 installed on the leveled concrete 1A, thereby forming the fixed part 20 (step S2). Next, basic reinforcement such as the main reinforcing bars 41 and band reinforcing bars 42 (see FIG. 5) that constitute the reinforced concrete beam 4 is arranged (step S3). At this time, since the vertical plate 22 is formed with reinforcing bar holes 22a through which the reinforcing bars (band reinforcing bars 42) are inserted, the reinforcing work is not obstructed by the vertical plate 22.

Next, concrete is poured to form a reinforced concrete beam 4 in which the fixing portion 20 is buried (step S4). At this time, concrete is poured so that the upper plate 23 of the fixing part 20 is exposed on the surface of the reinforced concrete beam 4. Next, backfilling is performed (step S5). Here, in order to secure a welding work space for the upper plate 23, backfill soil on the welding work side of the reinforced concrete beam 4 in which the fixing part 20 is buried is secured in a ton bag, and earth retaining is installed.

Next, the gusset plate 24 is welded to the top plate 23 exposed on the reinforced concrete beam 4 (step S6). Next, steel frames such as columns 6 and beams 8 are installed on the footing 3 (step S7), backfilled with earth and sand (step S8), and concrete is poured to the bottom of the slab 7 (step S9).

Next, reinforcement is arranged for the slab 7 (step S10), and concrete is poured to form the slab 7 (step S11). After this, the brace 10 is installed (step S12). At this time, the mounting member 13 provided at the upper end of the brace 10 is joined to the joining member 9 provided between the column 6 and the beam 8 with a bolt (not shown) or the like. Furthermore, the mounting member 13 provided at the lower end of the brace 10 is joined to the gusset plate 24 of the fixing part 20 embedded and fixed in the reinforced concrete beam 4 using a splicing plate 14 or a high-strength bolt 15. .

(Effects of Embodiment 1)
As described above, in the mounting structure of the brace 10 according to the first embodiment, when the brace 10 is installed on one frame constituting the building structure 100, the brace 10 is fixed. The portion 20 is buried within the reinforced concrete beam 4. This eliminates the need for anchor bolts for fixing the brace 10, making it possible to effectively utilize the internal space of the building structure 100 without spoiling the appearance of the floor surface of the building structure 100, and reducing construction costs for bolt installation. It is possible to suppress the lengthening of the construction period while reducing costs.

(Modified example of mounting structure of brace 10)
FIG. 11 is a front view showing a first modification of the mounting structure for the brace 10 according to the first embodiment. As shown in FIG. 11, the mounting structure of the brace 10 according to Modification 1 is different from that in that only one brace 10 is installed on one frame that constitutes the building structure 100 using the fixing part 20. , is configured similarly to the first embodiment described above. Also in this case, as in the first embodiment, the fixing portion 20 for fixing the brace 10 is embedded within the reinforced concrete beam 4, so that anchor bolts for fixing the brace 10 are not required. Therefore, the interior space of the building structure 100 can be effectively utilized without spoiling the appearance of the floor surface of the building structure 100, and the construction cost for installing bolts can be reduced while lengthening the construction period.

FIG. 12 is a front view showing a second modification of the mounting structure for the brace 10 according to the first embodiment. As shown in FIG. 12, the mounting structure of the brace 10 according to the second modification is such that the mounting member 13 provided at the lower end of the brace 10 is extended and directly welded to the upper plate 23 of the fixing part 20. ing. The mounting structure of the brace 10 according to the second modification is the same as that of the first embodiment described above, except that the mounting member 13 is extended and directly welded to the top plate 23 of the fixed part 20. has been done.

The mounting structure of the brace 10 according to the second modification is the same as the first embodiment up to the point where the fixing part 20 is buried in the reinforced concrete beam 4. Then, the extended mounting member 13 at the lower end of the brace 10 is directly welded to the upper plate 23 of the fixed part 20 buried in the reinforced concrete beam 4. Thereafter, concrete is poured to form the slab 7, and the mounting member 13 at the lower end of the brace 10 is fixed to the upper plate 23 of the fixing part 20.

Also in this case, as in the first embodiment, the fixing portion 20 for fixing the brace 10 is embedded within the reinforced concrete beam 4, so that anchor bolts for fixing the brace 10 are not required. Therefore, the interior space of the building structure 100 can be effectively utilized without spoiling the appearance of the floor surface of the building structure 100, and the construction cost for installing bolts can be reduced while lengthening the construction period. In addition, the gusset plate 24 is not required, and the attachment plate 14 and high-strength bolts 15 (see Fig. 2) for fixing the gusset plate 24 are also not required, so the number of parts can be reduced and costs can be reduced. You can also do that.

FIG. 13 is a front view showing a third modification of the mounting structure for the brace 10 according to the first embodiment. As shown in FIG. 13, in the case of the mounting structure of the brace 10 according to the third modification, in the anchor part 21 of the fixed part 20, the reaction force is applied to the outer surface side of the upper flange 211 and the lower flange 212 instead of the reaction force plate 214. A plate 217 is provided. In this case, a reaction plate 217 is provided on the outer surface of the upper flange 211 and lower flange 212 in place of the reaction plate 214 provided at both longitudinal ends of the upper flange 211 and the lower flange 212 and the web 213. It is provided. The mounting structure of the brace 10 according to the third modification is configured similarly to the first embodiment described above, except for this point.

The reaction plate 217 may have the same shape separately placed on the outer surfaces of the upper flange 211 and the lower flange 212, and may be joined by welding or the like, or may be made to penetrate through the upper flange 211 and the lower flange 212. It may be configured with one reaction force plate 217 in which a through hole is formed. Note that in the latter case as well, the reaction plate 217 and the outer surfaces of the upper flange 211 and the lower flange 212 are joined by welding or the like. As a result, compared to the case where reaction plates 214 are provided at both ends of the upper flange 211 and the lower flange 212, when concrete is poured, concrete can be spread to every corner, and concrete can be reliably filled. . Furthermore, it is possible to improve the efficiency of concrete pouring work.

Also in this case, as in the first embodiment, the fixing portion 20 for fixing the brace 10 is embedded within the reinforced concrete beam 4, so that anchor bolts for fixing the brace 10 are not required. Therefore, the interior space of the building structure 100 can be effectively utilized without spoiling the appearance of the floor surface of the building structure 100, and the construction cost for installing bolts can be reduced while lengthening the construction period. In addition, a reaction plate 217 is provided on the outer surface of the upper flange 211 and the lower flange 212 in place of the reaction plate 214, and the number of parts can be reduced by eliminating the need for the stiffening rib 215.

FIG. 14 is a front view showing a fourth modification of the mounting structure for the brace 10 according to the first embodiment. As shown in FIG. 14, in the mounting structure of the brace 10 according to the fourth modification, a reaction plate 218 is provided between the upper flange 211 and the lower flange 212 in place of the reaction plate 217 of the third modification described above. ing. Except for this point, the mounting structure of the brace 10 according to the fourth modification is configured similarly to the third modification. That is, in the case of the mounting structure of the brace 10 of Modification 4, instead of the reaction force plate 217 on the outer surface of the upper flange 211 and the lower flange 212, the reaction force plate 218 is erected between the upper flange 211 and the lower flange 212. ing. Thereby, the reaction plate 218 can serve as an intermediate rib between the upper flange 211 and the lower flange 212, and also have the function of maintaining the cross sections of the upper flange 211 and the lower flange 212.

Also in this case, as in the first embodiment, the fixing portion 20 for fixing the brace 10 is embedded within the reinforced concrete beam 4, so that anchor bolts for fixing the brace 10 are not required. Therefore, the interior space of the building structure 100 can be effectively utilized without spoiling the appearance of the floor surface of the building structure 100, and the construction cost for installing bolts can be reduced while lengthening the construction period. In addition, a reaction plate 218 is provided between the upper flange 211 and the lower flange 212 instead of the reaction plate 214, and the number of parts can be reduced by eliminating the need for the stiffening rib 215.

In this way, the reaction plates 214, 217, and 218 can be placed at any position at or between both ends of the upper flange 211 and the lower flange 212 in the longitudinal direction of the anchor part 21, more specifically between the two ends. It is sufficient if it is placed.

1 Ground, 1A Leveled concrete, 2 Piles, 3 Footings, 4 Reinforced concrete beams, 5 Foundations, 6 Columns, 7 Slabs, 8 Beams, 9 Joint members, 10 Brace, 11 Axial load members, 12 Stiffeners, 13 Mounting members , 14 attachment plate, 15 high-strength bolt, 20 fixed part, 21 anchor part, 22 vertical plate, 22a reinforcing bar hole, 23 top plate, 24 gusset plate, 30 fixed frame, 31 columnar member, 32 beam member, 33 square timber , 34 reinforcing member, 35 anchoring post bolt, 41 main reinforcing bar, 42 reinforcing bar, 100 building structure, 211 upper flange, 212 lower flange, 213 web, 214 reaction plate, 215 stiffening rib, 216 stiffening plate, 217 Reaction force plate, 218 Reaction force plate, O intersection.

Claims (13)

A brace mounting structure for installing a brace that receives an axial force in a building structure, comprising an axial member and mounting members respectively joined to both ends of the axial member in the axial direction,
The brace is
One of the mounting members is attached to a fixed part installed in a reinforced concrete structure formed using reinforced concrete of the building structure,
The fixed part is
An anchor part embedded in the reinforced concrete of the reinforced concrete structure and fixed to the building structure;
a vertical plate erected from the anchor part toward the surface of the reinforced concrete structure part and buried integrally with the anchor part;
a gusset plate arranged in a direction perpendicular to the surface of the reinforced concrete structure, one end connected to the vertical plate, and the other end joined to the one attachment member of the brace; ,
The anchor part is
An upper flange and a lower flange in the form of rectangular long plates arranged in a pair in the vertical direction;
a rectangular long plate-shaped web that stands between the upper flange and the lower flange and connects the upper flange and the lower flange, and is formed in an H-shape;
It is arranged along the surface of the reinforced concrete structure,
The anchor part is
The brace mounting structure further includes a rectangular reaction force plate that is disposed at or between both ends of the upper flange and the lower flange in the longitudinal direction and reinforces the upper flange and the lower flange. 2. The brace attachment structure according to claim 1, wherein the anchor portion has stiffening ribs arranged along the longitudinal direction of the web joined to both ends of the web where the reaction plate is provided. The fixed part is
connected to an end of the vertical plate located on the surface side of the reinforced concrete structure,
further comprising a top plate disposed substantially parallel to the surface of the reinforced concrete structure,
The brace attachment structure according to claim 1 or 2 , wherein the gusset plate is connected to the vertical plate via the top plate. The gusset plate is
The brace attachment structure according to claim 3, wherein the one end is welded to the top plate connected to the vertical plate, and the other end is integrally joined to the brace. The anchor part is
The brace mounting structure according to any one of claims 1 to 4 , further comprising a stiffening plate arranged at an intermediate portion in the longitudinal direction of the upper flange and the lower flange and reinforcing the upper flange and the lower flange. The vertical plate includes
The brace mounting structure according to any one of claims 1 to 5, wherein a reinforcing bar hole is formed through which a reinforcing bar of the reinforced concrete is inserted. The brace attachment structure according to any one of claims 1 to 6, wherein the vertical plate and the web of the anchor portion are integrally formed. The brace mounting structure according to any one of claims 1 to 7, wherein the one mounting member of the brace and the gusset plate are joined by a high-strength bolt and a splicing plate. The brace attachment structure according to any one of claims 1 to 8 , wherein a central portion of the anchor portion is located at an intersection of axes of the two braces. The brace is
A buckling restraint brace configured to include a stiffening member that stiffens the axial member in addition to the axial member and each of the mounting members, and that suppresses buckling of the member due to axial force in the compression direction. The brace mounting structure according to any one of items 1 to 9 . The brace mounting structure according to any one of claims 1 to 10 , wherein the reinforced concrete structure is a beam or a slab of the building structure. A structure provided with a brace fixed by the brace attachment structure according to any one of claims 1 to 11 . A brace mounting method for installing a brace that receives an axial force in a building structure, comprising an axial member and mounting members respectively joined to both ends of the axial member in the axial direction, the method comprising:
installing an anchor part on the foundation of the building structure via a fixed frame;
Assembling reinforcing bars to the anchor part and a vertical plate erected on the anchor part;
pouring concrete into the foundation and burying the anchor part and the vertical plate together;
connecting one end of a gusset plate arranged in a direction crossing the surface formed by pouring the concrete to the vertical plate;
a step of joining the other end of the gusset plate to a mounting member of the brace,
The anchor part is
An upper flange and a lower flange in the form of rectangular long plates arranged in a pair in the vertical direction;
a rectangular long plate-shaped web that stands between the upper flange and the lower flange and connects the upper flange and the lower flange, and is formed in an H-shape;
It is arranged along the surface of a reinforced concrete structure part formed using reinforced concrete of the building structure,
The anchor part is
The brace attachment method further comprises a rectangular reaction force plate disposed at or between both ends of the upper flange and the lower flange in the longitudinal direction and reinforcing the upper flange and the lower flange.

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