JP7228344B2 - Joint structure of reinforced concrete frame and brace and precast member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint structure between a frame of reinforced concrete construction and a brace , and a precast member .

Conventionally, when incorporating a brace damper or a steel brace into an RC (reinforced concrete) structure, it is necessary to smoothly transmit the axial force of the brace through the steel material, and various details have been used.

For example, a fixing member made of metal or concrete is provided at the end of the brace, and the fixing member is placed at the joint between the column and the beam, and round steel, anchor bolts, etc. (including post-installed anchors, hereinafter anchor There has been proposed a joint structure in which a column and a beam are fixed with bolts (see Patent Document 1 below).

Japanese Patent No. 6199201

However, in the joint structure described in Patent Document 1 above, since the fixing member is arranged at the joint between the column and the beam, the beam is necessary in the first place, and the tensile force and shear force generated in the anchor bolt are reduced. Many anchor bolts are required to bear the load. There is a problem that many members such as anchor bolts and members for connecting to the anchor bolts are required, which complicates the structure.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and provides a joint structure between a reinforced concrete frame and a brace, and a precast member with a simple configuration.

In order to achieve the above object, the present invention employs the following means.
That is, the joint structure of the reinforced concrete frame and the brace according to the present invention is arranged between the adjacent reinforced concrete frame and the adjacent frame, and one end is joined to one frame and crosses each other. An upper first brace and a lower second brace made of H-shaped steel arranged in the A connection unit includes a base plate arranged along a vertical plane orthogonal to the frame plane on which the first brace and the second brace are arranged, and a connection unit extending horizontally from an upper portion of the base plate and connecting the base plate and the first brace. a lower plate extending horizontally from the lower portion of the base plate and connecting the base plate and the lower flange of the second brace; the base plate, the upper plate, the The base plate, the upper plate, the lower plate and the first brace are provided along the frame plane in a space formed by a lower plate, one end of the first brace and one end of the second brace. , and a vertical plate connected to the second brace , on the extension line of the lower flange of the first brace and on the extension line of the upper flange of the second brace, and are arranged on the same plane. In addition, an extension plate connected to the base plate and the vertical plate , and on the extension line of the upper flange of the first brace and the extension line of the lower flange of the second brace with the extension plate in between, respectively a connection plate connected to the base plate and the vertical plate and connected to the same plane of the connection unit and one end of the first brace and one end of the second brace; The intersecting portion is characterized by being embedded in the reinforced concrete frame.

In the joint structure between the reinforced concrete frame and the brace configured in this way, one end of the first brace and one end of the second brace are joined with a base plate, and these joints are joined to the concrete of the reinforced concrete frame. When embedded, the resultant force of the first brace and the second brace is transmitted to the concrete by the bearing stress of the embedded portion. Therefore, there is no need for hardware or the like for joining anchor bolts or braces to the frame, and a simple configuration can be achieved.
One end of the first brace and one end of the second brace are connected by a base plate, and the base plate and one of the first brace and the second brace are connected by an upper plate. The other of the two braces is connected with the lower plate. The horizontal force of the axial forces of the intersecting first and second braces is canceled, and the vertical force acts as bearing stress from the upper plate and lower plate to the concrete and is transmitted to the multi-story earthquake-resistant wall. . Therefore, the vertical force of the axial force of the first brace and the second brace can be processed by the bearing pressure resistance force by the upper plate and the lower plate arranged along the horizontal direction.
Further, in the space formed by the base plate, the upper plate, the lower plate, one end of the first brace and one end of the second brace, a vertical plate along a plane including the axial direction of the first brace and the second brace is provided. is provided. Therefore, the rigidity of the joint portion between the first brace and the second brace can be increased.

Moreover, in the joint structure of the reinforced concrete frame and the brace according to the present invention, it is preferable that the frame is a multi-story earthquake-resistant wall.

In the joint structure of the reinforced concrete frame and the brace constructed in this way , the bending shear and tension of the anchor bolts are not used to resist, but the bearing pressure resistance of the concrete is used to integrate them (multi-story earthquake-resistant wall and the first brace). and the second brace) is extremely small, and the rigidity (fixation degree) of the joints between the first brace, the second brace, and the multi-story earthquake-resistant wall made of reinforced concrete can be increased.

Further, in the joint structure between a reinforced concrete frame and braces according to the present invention, the first brace and the second brace are connected to a steel frame that is connected to the connection unit , and to the steel frame. and a damper disposed on the opposite side of the connection unit with a steel frame interposed therebetween .

In the joint structure between the reinforced concrete frame and the brace constructed in this way, the high rigidity of the joint effectively absorbs the vibration energy acting on the building where the first and second braces are installed. It can dampen the vibrations and give the building damping performance.
In addition, a precast member according to the present invention is a precast member used in the joint structure between the above-described reinforced concrete frame and the brace, and includes a main reinforcement extending in the vertical direction and a plurality of vertical reinforcements wound around the main reinforcement. a hoop bar, a connecting unit, a steel frame joined to the connecting unit and forming the lower end of the first brace and the upper end of the second brace, at least the main bar, the hoop bar, the connecting unit, and the and a concrete portion in which a part of the steel frame is embedded, and constitutes a part of the one skeleton .

ADVANTAGE OF THE INVENTION According to the joint structure and precast member of the frame|body of a reinforced concrete structure and a brace which concern on this invention, it can be set as a simple structure.

It is a figure which shows the joining structure of the frame|body and brace of a reinforced concrete structure which concern on one Embodiment of this invention. 1 is an enlarged view of a joint structure between a frame made of reinforced concrete and a brace according to an embodiment of the present invention; FIG. 1 is a perspective view of a main part of a joint structure between a frame made of reinforced concrete and a brace according to an embodiment of the present invention; FIG. 1 is a front view of a main part of a joint structure between a frame made of reinforced concrete and a brace according to an embodiment of the present invention; FIG. FIG. 5 is a cross-sectional view taken along line AA of FIG. 4;

DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint structure between a reinforced concrete frame and braces according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a joint structure between a reinforced concrete frame and braces according to an embodiment of the present invention.
As shown in FIG. 1, a joint structure 100 between a reinforced concrete frame and braces (hereinafter simply referred to as "joint structure 100") according to the present embodiment is a multi-story earthquake-resistant wall (framework ) 1 are connected by a plurality of braces 2.

FIG. 2 is an enlarged view of a main part of the joint structure 100. FIG.
As shown in FIG. 2 , the joint structure 100 includes a multi-story earthquake-resistant wall 1 , a plurality of braces 2 , and a connection unit 4 . The joint structures 100 are provided at both ends (both ends in the axial direction) of the brace 2 .

The multi-story seismic wall 1 is made of reinforced concrete, and is vertically connected from the top floor to the bottom floor of a building, for example. The multistory earthquake-resistant wall 1 has a column 11 and an earthquake-resistant wall 16 joined to the column 11 .

As shown in FIG. 4, the column 11 includes a plurality of main reinforcements 12 extending in the vertical direction, a plurality of hoop reinforcements 13 wound around the main reinforcements 12 and arranged in the vertical direction, and a concrete portion 14 in which the main reinforcements 12 and the hoop reinforcements 13 are embedded. and have

As shown in FIG. 2, the braces 2 are arranged on the frame plane F along the vertical direction between the multistory earthquake-resistant walls 1 arranged adjacent to each other. A plurality of braces 2 are arranged vertically along the frame plane F.

The brace 2 is arranged to be inclined with respect to the vertical direction. The upper and lower braces 2 are arranged with different inclination directions. The lower end of the brace 2 on the upper side and the upper end of the brace 2 on the lower side are arranged so as to cross each other. The mounting height (height interval) of the braces 2 may be a height corresponding to the floor height of the building, or may be installed at equal intervals.

The brace 2 is composed of a so-called brace damper. In this embodiment, the brace damper has the steel beams 20 arranged at both ends in the axial direction, and the oil damper 31 and the ball joint 32 arranged at the central portion. The brace damper absorbs and attenuates vibration energy acting on the building in which the joint structure 100 is provided, and imparts vibration damping performance to the building.

In this embodiment, the steel frames 20 at both ends of the brace 2 are made of H-shaped steel.
FIG. 3 is a perspective view of a main part of the joint structure 100. FIG. FIG. 4 is a front view of a main part of the joint structure 100. FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4. FIG. 3, the outer shape of the column 11 is indicated by a two-dot chain line, and in FIG. 4, the column 11 is indicated by a broken line.
As shown in FIGS. 3 and 4, each steel frame 20 has upper and lower flanges 21 and 22 and a web 23 connecting the upper and lower flanges 21 and 22 . The web 23 of the steel frame 20 is arranged along the frame plane F (see the two-dot chain line in FIG. 5).

As shown in FIG. 4 , an end plate 26 is provided at the end of the steel frame 20 opposite to the side joined to the column 11 for bolting to the end of the brace 2 .

At the junction between the multi-story earthquake-resistant wall 1 and the upper and lower braces 2, one brace 2 is called a first brace 2A, and the other brace 2 is called a second brace 2B. In FIG. 4, for the sake of convenience, the first brace 2A is arranged on the upper side and the second brace 2B is arranged on the lower side. and may be reversed.

The connecting unit 4 integrates (connects) the lower end (one end) of the first brace 2A and the upper end (one end) of the second brace 2B. The connection unit 4 has a base body 5 , an upper flange plate (upper plate) 6 , a lower flange plate (lower plate) 7 and a web plate (vertical plate) 8 .

The base body 5 has extension plates 41 and 42 , a base plate 45 and connection plates 47 and 48 . The first brace 2A and the second brace 2B are joined to a base plate 45 via extension plates 41 and 42 and connection plates 47 and 48. As shown in FIG.

The extension plate 41 is arranged on the same plane on the extension line of the lower flange 22 of the first brace 2A. The extension plate 42 is arranged on the same plane on the extension line of the upper flange 21 of the second brace 2B.

The extension plate 41 is arranged at the upper end of the second brace 2B. The extension plate 42 is arranged at the lower end of the first brace 2A.

The ends 41a and 42a of the extension plates 41 and 42 are arranged to cross each other and are joined to the lower flange 22 of the first brace 2A and the upper flange 21 of the second brace 2B.

The extension plate 41 is joined to the web 23 and the lower flange 22 of the second brace 2B. The extension plate 42 is joined to the web 23 and upper flange 21 of the first brace 2A.

The base plate 45 connects an end 41b of the extension plate 41 (an end opposite to the end 41a) and an end 42b of the extension plate 42 (an end opposite to the end 42a).

The base plate 45 is arranged along a vertical plane orthogonal to the frame plane F. The lower end of the base plate 45 is arranged below the end of the extension plate 41 . The upper end of the base plate 45 is arranged above the end of the extension plate 42 .

The connection plate 47 is arranged on the same plane on the extension line of the upper flange 21 of the first brace 2A with the extension plate 42 interposed therebetween.

An end portion 47 a of the connection plate 47 is joined to the extension plate 42 . An end portion 47 b of the connection plate 47 is joined to the base plate 45 .

The connection plate 48 is arranged on the same plane on the extended line of the lower flange 22 of the second brace 2B with the extension plate 41 interposed therebetween.

An end portion 48 a of the connection plate 48 is joined to the extension plate 41 . An end portion 48 b of the connection plate 48 is joined to the base plate 45 .

The upper flange plate 6 is arranged along the horizontal plane. The upper flange plate 6 connects the upper end of the base plate 45 and the upper flange 21 of the first brace 2A.

The lower flange plate 7 is arranged along the horizontal plane. The lower flange plate 7 connects the lower end of the base plate 45 and the lower flange 22 of the second brace 2B.

The web plate 8 is arranged in a space formed by the base plate 45, the upper flange plate 6, the lower flange plate 7, the lower ends of the first braces 2A and the upper ends of the second braces 2B. The web plate 8 is arranged along the frame plane F. The web plate 8 is composed of a plurality of divided plates 80 divided according to the size of the space.

The steel frame 20 at the lower end of the first brace 2A, the steel frame 20 at the upper end of the second brace 2B, and the connecting unit 4 are embedded in the concrete portion 14 of the column 11. As shown in FIG.

In the joint structure 100 described above, the column 11 (divided vertically into the range indicated by the two-dot chain line in FIG. 2) includes a steel frame 20 at the lower end of the first brace 2A and a steel frame 20 at the upper end of the second brace 2B. And it can also be precast as a member in which the connecting unit 4 is embedded. In this case, the main bars 12 of the columns 11 can be connected within the sleeves 15 .

In the joint structure 100 configured in this manner, the lower end of the first brace 2A and the upper end of the second brace 2B are joined by the base plate 45, and these joints are buried in the concrete portion 14 of the reinforced concrete column 11. Then, the resultant force of the first brace 2A and the second brace 2B is transmitted to the concrete portion 14 by the bearing pressure stress of the embedded portion. Therefore, there is no need for hardware or the like for joining anchor bolts or braces to the frame, and a simple configuration can be achieved.

The lower end portion of the first brace 2A and the upper end portion of the second brace 2B are connected by a base plate 45, and the base plate 45 and the first brace 2A are connected by an upper flange plate 6, and the base plate 45 and the second brace are connected. 2B are connected by a lower flange plate 7 . Among the axial forces of the crossing first brace 2A and second brace 2B, the horizontal force is canceled out, and the vertical force acts as a bearing stress from the upper flange plate 6 and the lower flange plate 7 to the concrete portion 14. It is transmitted to the multi-story seismic wall 1 . Therefore, the upper flange plate 6 and the lower flange plate 7 arranged along the horizontal direction can handle the vertical force of the axial force of the first brace 2A and the second brace 2B with bearing pressure resistance.

In addition, deformation of the joints (between the multi-story earthquake-resistant wall 1 and the first brace 2A and the second brace 2B) is integrated by the bearing pressure resistance of the concrete part 14 instead of resisting by the bending shear and tension of the anchor bolts. The amount is extremely small, and the rigidity (fixation degree) of the joint portion between the first brace 2A, the second brace 2B, and the multi-story earthquake-resistant wall 1 made of reinforced concrete can be increased.

A compressive force acts on one brace 2 and a tensile force acts on the other brace 2, but since the axial forces of the intersecting braces 2 are almost the same, the resultant force in the horizontal direction is zero. Become. On the other hand, the resultant force in the vertical direction acts as a bearing stress on the upper flange plate 6 and the lower flange plate 7 embedded in the concrete portion 14, and is transmitted to the multi-story earthquake-resistant wall 1, so that it can be efficiently carried out without deformation loss. can be transmitted. Moreover, since there is no joint with a beam, when the joint structure 100 is adopted for a reinforced concrete core wall, the degree of freedom of the mounting position in the vertical direction is high.

A web plate 8 along the frame plane F is provided in a space formed by the base plate 45, the upper flange plate 6, the lower flange plate 7, the lower end of the first brace 2A and the upper end of the second brace 2B. ing. Therefore, the rigidity of the joint portion between the first brace 2A and the second brace 2B can be increased.

In addition, by adopting brace dampers as the first brace 2A and the second brace 2B, the high rigidity of the joints effectively absorbs the vibration energy acting on the building in which the joint structure 100 is provided. It can be damped and can give damping performance to the building.

It should be noted that the various shapes, combinations, etc., of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, the multi-story earthquake-resistant wall 1 was described as an example of a frame made of reinforced concrete, but the present invention is not limited to this. , or columns and beams.

Further, the end plate 26, the upper flange plate 6, and the lower flange plate 7 may each be provided with ribs extending in a direction orthogonal to the in-plane direction (direction along the plate surface).

Moreover, in the embodiment shown above, the upper flange plate 6 and the lower flange plate 7 are provided, but the present invention is not limited to this, and the connection unit 4 may include at least the base plate 45 . Although it has been described that the joint is mechanically formed without anchor bolts, anchor bolts (not shown) may be fixed to the base plate 45 to fix it in the reinforced concrete column 11 or earthquake-resistant wall 16 . , the upper and lower flange plates 6 and 7 may be fixed in the reinforced concrete column 11 by welding reinforcing bars (not shown).

Further, in the above-described embodiment, the brace damper was described as an example of the brace 2, but the present invention is not limited to this, and a simple brace without the oil damper 31 may be used.

Further, in the embodiment shown above, the braces 2 are arranged in one row in the wall thickness direction of the multi-story earthquake-resistant wall 1, but they may be arranged in multiple rows in the wall thickness direction.

In addition, in the embodiment shown above, a configuration in which the column 11, the steel frame 20 at the lower end of the first brace 2A, the steel frame 20 at the upper end of the second brace 2B, and the connection unit 4 are precast has been described. The present invention is not limited to this, and can also be applied to a method of constructing each member on site.

1…Multi-story seismic wall (framework)
2 Brace 2A First brace 2B Second brace 4 Connection unit 5 Base body 6 Upper flange plate (upper plate)
7 ... lower flange plate (lower plate)
8 ... web plate (vertical plate)
11... Column 14... Concrete part 16... Seismic wall 20... Steel frame 21, 22... Flange 23... Web 26... End plate 31... Oil damper 32... Ball joint 41, 42... Extension plate 45... Base plate 47, 48... Connection Plate 80... Divided plate 100... Joint structure F... Frame surface

Claims (4)

Adjacent reinforced concrete frame,
an upper first brace and a lower second brace, which are arranged between the adjacent skeletons, are joined to one skeleton at one end, and are made of H-shaped steel and arranged to cross each other;
a connection unit that connects one end of the first brace and one end of the second brace;
The connecting unit is
a base plate arranged along a vertical plane perpendicular to the frame plane on which the first brace and the second brace are arranged ;
a top plate extending horizontally from the top of the base plate and connecting the base plate and an upper flange of the first brace;
a lower plate extending horizontally from a lower portion of the base plate and connecting the base plate and a lower flange of the second brace;
provided along the frame plane in a space defined by the base plate, the upper plate, the lower plate, one end of the first brace, and one end of the second brace , the base plate, the upper plate, a vertical plate connected to the bottom plate, the first brace, and the second brace ;
An extension plate connected to the extension line of the lower flange of the first brace and the extension line of the upper flange of the second brace on the same plane and connected to the base plate and the vertical plate. and,
are connected on the same plane on the extension line of the upper flange of the first brace and on the extension line of the lower flange of the second brace, with the extension plate interposed therebetween , and the base plate and the vertical a connection plate coupled to the plate ;
A joint between a reinforced concrete frame and a brace, wherein the connection unit and the intersection of the one end of the first brace and the one end of the second brace are embedded in the reinforced concrete frame. structure. 2. A joint structure between a frame of reinforced concrete construction and a brace according to claim 1, wherein the frame is a multi-story seismic wall. The first brace and the second brace are
a steel frame that joins with the connection unit ;
3. The reinforced concrete frame and brace according to claim 1, further comprising a damper connected to the steel frame and arranged on the opposite side of the connection unit with the steel frame interposed therebetween. junction structure. A precast member used in the joint structure between the reinforced concrete frame and the brace according to any one of claims 1 to 3,
Main bars extending vertically,
a plurality of hoop reinforcements wound around the main reinforcement and arranged in a vertical direction;
the connecting unit ;
a steel frame joined to the connecting unit and forming a lower end of the first brace and an upper end of the second brace;
a concrete portion in which at least the main reinforcement, the hoop reinforcement, the connection unit, and a part of the steel frame are embedded;
A precast member that constitutes a part of the one skeleton .

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