JP2000204674A - Column-beam joining part of column of steel pipe structure or filled steel pipe concrete structure and beam of src structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationally and economically design by projecting diaphragms on a steel pipe forming a column, and fixing an end part of a main reinforcement to the diaphragms via a beam axial reinforcement fixing metallic material. SOLUTION: A column 1 is formed by filling concrete 4 in a steel pipe 3 such as a square steel pipe or a circular steel pipe, and in that case, the concrete 4 is filled only in the total length of the steel pipe 3 or a joining part of a beam 2, and diaphragms 5 and a web plate 6 for reinforcing this joining part and joining the beam 2 are respectively projected in the joining part of the beam 2. The diaphragms 5 are respectively projected by horizontally penetrating through a part corresponding to upper/lower flanges 7a of a beam steel frame 7 of the steel pipe 3, and the web plate 6 is vertically projected between the upper/lower diaphragms 5, 5 of the steel pipe 3. The upper/lower diaphragms 5 and the web plate 6 are integrally fixed to the steel pipe 3 by welding. Thus, the transmission of stress to the column from the beam is clarified not only in a steel frame part but also in an RC part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a column of a steel pipe structure or a column of a filled steel pipe concrete structure (hereinafter referred to as "CFT structure") formed by filling concrete into a steel pipe and an H-shaped steel or the like. The present invention relates to a column / beam joint typified by joining with a beam having an SRC structure using steel as a steel beam.

[0002]

2. Description of the Related Art For example, FIGS.
The column-to-beam joint between the column 20 having the FT structure and the beam 21 having the SRC structure having an H-shaped steel beam is shown.
The beam steel frame 23 of the beam 21 is directly joined to the beam 21 by a high-strength bolt joint or the like.

[0003] The end of the main beam 24 is inserted into a steel pipe 22 as shown in FIG. 4 (a) and bent upward or downward in the steel pipe 22, and then into concrete 25 in the steel pipe 22. It is established by burying it.

In practice, it is difficult to process the fixing portion of the main beam 24. Therefore, as shown in FIG. 4B, for example, the end of the main beam 24 is stopped at the end of the beam 21, and Only the steel frame 23 is joined to the steel pipe 22.

It is conceivable that the end of the beam main reinforcement 24 is welded directly to the steel pipe 22 to be fixed, but there are also problems in construction and strength due to reasons such as forced welding on site. The end of the beam main reinforcement 24 is not fixed to the steel pipe 22, and the stress of the beam main reinforcement 24 is not directly transmitted to the steel pipe 22.

[0006]

For this reason, beam main reinforcement 2
4 cannot be said to be an economical and rational design that effectively utilizes the proof stress, and there is a problem that the amount of steel frame of the beam 21 cannot be reduced.

[0007] In addition, even if the beam is made into a precast structure in consideration of labor saving at the site, there is another problem that the end of the beam main reinforcement 24 cannot be easily fixed. The present invention has been made in order to solve the above-mentioned problems. In particular, transmission of stress (bending moment and shear force) between a beam and a column is ensured not only for a steel frame portion but also for an RC portion. A steel pipe structure or CFT that clarifies the joint stress analysis and makes the joint design rational and economical
It is an object of the present invention to provide a column-beam joint between a structural column and a beam having an SRC structure.

[0008]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided a column-to-beam joint, comprising a steel pipe structure or a filled steel pipe concrete structure, and an SRC structure beam. At the column / beam joint, a diaphragm is protruded from a steel pipe forming the column, and the end of the beam main bar forming the beam is fixed to the diaphragm via the beam main bar fixing metal.

According to a second aspect of the present invention, there is provided a column / beam joint according to the first aspect, wherein the beam main bar fixing metal is fixed to the diaphragm, and is protruded from a distal end portion of the fixed portion. The fixing portion has a fixing portion, and a plurality of reinforcing portions projecting at predetermined intervals in a corner portion formed by the fixing portion and the fixing portion.

[0010]

1 to 3 show one embodiment of the present invention. In the drawings, a beam 2 is attached to a beam joint of a column 1.
Are joined. Pillar 1 has CFT structure and beam 2 has SR
Each is formed in a C structure.

In particular, the column 1 is formed by filling concrete 4 in a steel pipe 3 such as a square steel pipe or a circular steel pipe, and the concrete 4 is filled only in the entire length of the steel pipe 3 or only at the joint of the beam 2. . Further, a diaphragm 5 and a web plate 6 are provided at a joint portion of the beam 2 to reinforce this portion and to join the beam 2, respectively.

The diaphragm 5 projects horizontally through portions of the steel pipe 3 that correspond to upper and lower flanges 7a of a beam steel 7 to be described later.
Are vertically projected between the upper and lower diaphragms 5 and 5. The upper and lower diaphragms 5 and the web plate 6 are integrally fixed to the steel pipe 3 by welding.

The beam 2 has a plurality of beam reinforcing bars 8 arranged along the axial direction of the beam on the upper and lower sides of a beam steel member 7 made of H-section steel, and a plurality of shear reinforcing bars 9 are wound therearound at predetermined intervals. The concrete beam 4 is filled around the beam beam 7, the beam main bar 8, and the shear reinforcing bar 9 to form a substantially rectangular section.

Also, the ends of the upper and lower flanges 7a of the beam steel frame 7 are respectively joined to the ends of the upper and lower diaphragms 5 by welding, and the ends of the webs 7b are joined to the web plate 6 by the joining plate 10a and the plurality of joining bolts 10b. Further, the ends of the beam main bar 8 are joined to the upper and lower diaphragms 5 via beam main bar fixing hardware (hereinafter referred to as “fixing hardware”) 11, respectively.

The concrete 4 is so formed that all the members are buried in the joint between the column 1 and the beam 2 thus formed.
Is filled. Thus, the end of the beam 2 is joined to the beam joint of the column 1.

When the beam 2 is factory-produced as a precast concrete member, the upper and lower flanges 7a and the web 7b of the beam steel frame 7 and the end of the beam main bar 8 are connected to the column 1
Each of the joints projects from the concrete surface by a predetermined length.

As shown in FIGS. 3 (a) and 3 (b), the fixing metal 11 has a fixing part 11b vertically protruding from the tip of the fixing part 11a, and has a corner formed by the fixing part 11a and the fixing part 11b. A plurality of reinforcing portions 11c are protruded at predetermined intervals in the portion, and a plurality of mounting holes 11d are formed in the fixing portion 11a and the fixing portion 11b.
And fixing holes 11e are provided at predetermined intervals.

Both the fixing portion 11a and the fixing portion 11b are formed in a rectangular plate shape elongated in the direction perpendicular to the axis of the beam 2, and the reinforcing portion 11c is formed in a triangular plate shape (or a rectangular plate shape). Further, the mounting hole 11d and the fixing hole 11e are
It is formed between 1c and 11c.

The fixing metal 11 is formed by welding a plurality of plates formed in a rectangular plate shape and a triangular plate shape (or a rectangular plate shape), or by casting the fixing portion 11a, the fixing portion 11b, and the reinforcing portion 11c. Or by integral molding.

The fixing hardware 11 thus formed is provided with bolt holes 11d of the fixing portion 11a above the upper diaphragm 5 and below the lower diaphragm 5, and bolt holes 5a formed in the diaphragm 5 corresponding to the bolt holes 11d. Are mounted by bolting with a plurality of mounting bolts 12 penetrating through.

The end of the main beam 8 is fixed to the fixing portion 11b.
The fixing hole 11e is connected to the fixing hardware 11 by screwing a plurality of fixing nuts 13 to the tip of the fixing hole 11e. At this time, the fixing nut 13 is screwed so as to strongly clamp the fixing portion 11b from the back and the front. Thus, the end of the main beam 8 is fixed to the column 1 via the fixing hardware 11.

Since the column 1 and the beam 2 are joined in this manner, stress transmission from the beam 2 to the column 1 is ensured not only for the steel frame portion but also for the RC portion. The beam main rebar can work more effectively than the joint.

In particular, according to the fixing hardware shown in FIG. 3B, the concrete restraining plate 11f is provided on the beam side of the fixing portion 11b so as to protrude along the peripheral edge of the fixing portion 11b. The binding force is extremely large, and the transmission of stress between the column 1 and the beam 2 can be ensured.

When the fixing metal 11 is mounted, the mounting position of the fixing metal 11 can be freely adjusted by making the mounting hole 11d of the fixing portion 11a a long hole or a loose hole.

Further, by interposing a filler between the diaphragm 5 and the fixing fitting 11 or making the fixing hole 11e a long hole, the level of the main beam 8 can be freely dealt with.

[0026]

The present invention has the above-described structure,
In particular, since the end of the main beam is also fixed to the steel frame of the column via the fixing metal, the transmission of stress from the beam to the column is made clear not only for the steel frame portion but also for the RC portion.

[0027] For this reason, the main beam reinforcement can also work more effectively than the conventional column / beam joint where only the steel part of the column and the beam is joined, so that a very economical and rational design is possible.

Further, the beam having the SRC structure is connected to a steel pipe structure or CF.
It becomes possible to join to a column of T structure in the same manner as a conventional steel frame structure, and there is an effect that a large labor saving of on-site construction can be achieved. Furthermore, the beam main bar fixing hardware is provided at a fixed portion fixed to the diaphragm and at a tip end of the fixed portion, and is fixed to a fixing portion where the end portion of the beam main bar is fixed, and a corner portion including the fixed portion and the fixing portion. Having a plurality of reinforcing portions projecting at intervals,
Since it is formed in a simple shape, it is easy to manufacture and cost reduction by mass production is possible.

[Brief description of the drawings]

1A and 1B show a joint portion between a column having a CFT structure and a beam having an SRC structure, wherein FIG. 1A is a cross-sectional view thereof, and FIG.

FIG. 2A is a sectional view taken along line AA in FIG. 1B;
FIG. 2B is a sectional view taken along line BB in FIG.

FIGS. 3A and 3B are perspective views showing an example of a fixing hardware.

FIGS. 4A and 4B are longitudinal sectional views showing an example of a conventional example of a joint portion between a column having a CFT structure and a beam having an SRC structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Steel pipe 4 Concrete 5 Diaphragm 6 Web plate 7 Beam steel 7a Upper and lower flanges 7b Web 8 Beam main reinforcement 9 Shear reinforcement 10a Joint plate 10b Joint bolt 11 Fixing metal (fixing metal for main beam) 12 Mounting bolt 13 Fixing nut

Claims (2)

[Claims] At a column / beam joint between a steel pipe structure or a column of a filled type steel pipe concrete structure and a beam of an SRC structure, a diaphragm is protruded from a steel pipe forming the column, and a beam main bar forming a beam on the diaphragm. A beam / column joint of a steel pipe structure or a filled steel pipe concrete structure column and an SRC structure beam, wherein an end of the beam is fixed via a beam fixing hardware. 2. The beam main bar fixing hardware includes a fixing portion fixed to the diaphragm, a fixing portion protruding from a distal end of the fixing portion, and fixing an end of the beam main bar, and a fixing portion and a fixing portion. 2. A column / beam joint section between a steel pipe structure or a filled steel pipe concrete structure column and an SRC structure beam according to claim 1, further comprising a plurality of reinforcing portions projecting at predetermined intervals at the corner portion. .