JPH11117392A - Joint between steel pipe structure column or filling type steel pipe concrete structure column and src structure beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely transmit a stress between a beam and a column and to clearly analyze a stress at a joint by a method wherein a column.beam joint between a CFT structure column and SRC structure beam is formed such that a joining metal fitting is securely arranged at a joint between a column and a beam, and a joining hardware is securely arranged between the beam steel of the beam and a beam main reinforcing bar and at the steel pipe of a column. SOLUTION: A beam 2 is joined with the beam joint of a column 1, the column 1 is formed in CFT structure and the beam 2 in SRC structure. The column 1 is formed with a steel pipe 3 formed of a square steel pipe filled with concrete 4, a joint is reinforced at the joint of the beam 2, and a diaphragm 5 and a web plate 6 for joining the beam 2 are protruded. The beam 2 is formed such that a plurality of main reinforcing bar 8 are arranged on the upper side and the lower side of a beam formed of a beam frame steel 7 formed of an H-steel, a plurality of shear reinforcing bar 9 is wound around the periphery thereof several times, and filling with concrete 10 is effected in a rectangular shape in cross section. A joining hardware 11 is protruded against the so formed beam 2 and the column 1 and the beam 2 are joined together. This constitution ensures transmission of a stress and clearly analyses the stress of the joint part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art For example, FIG. 3 shows a column / beam joint between a column 20 having a CFT structure and a beam 21 having an SRC structure having an H-shaped steel beam, and a steel pipe 22 of the column 20 and a beam steel frame of the beam 21. 23 is directly joined by welding or the like. The ends of the main beams 24 of the beam 21 penetrate through one side of the steel pipe 22, are bent upward or downward in the steel pipe 22, and are then fixed in the concrete 25 filled in the steel pipe 22.

[0003]

Heretofore, at the column / beam joint between the CFT column and the SRC beam, the steel pipe 22 and the beam steel frame 23 have been directly joined in the structural design of the joint. Therefore, although the stress analysis of the steel frame part can be clarified, the end of the beam main reinforcement 24 is simply embedded and fixed in the concrete 25 of the column 20, and the concrete 25 of the column 20 is fixed.
Since the concrete portion 26 of the beam 21 is separated by the steel pipe 22, the stress analysis of the RC portion cannot be performed clearly. For this reason, the design has to be neglected in ignoring the strength of the beam main reinforcement 24, and there is a problem that the design becomes extremely uneconomical.

[0004] In addition, at the joint as shown in FIG.
Since the processing of the main beam 24 becomes complicated, for example, FIG.
As shown in the figure, there is a method in which the end of the beam main reinforcement 24 is stopped at the end of the beam 21 and only the beam steel frame 23 is joined to the steel pipe 22.However, there is a problem that the strength of the main reinforcement cannot be effectively used. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, the transmission of stress (bending moment and shear force) between a beam and a column is surely performed not only for a steel frame portion but also for an RC portion. It is an object of the present invention to provide a column-beam joint between a steel pipe structure or a column having a CFT structure and a beam having an SRC structure, which enables the stress analysis of the joint to be clarified.

[0006]

In order to solve the above-mentioned problems, in order to solve the above-mentioned problems, a column-to-beam joint between a steel pipe structure or a column having a CFT structure and a beam having an SRC structure is a joint between a column and a beam. A metal joint for joining the column and the beam is fixedly attached to the beam steel beam, the beam main reinforcement, and the steel pipe of the column.

[0007] The metal joint is fixed to an end plate fixed to the end of the beam steel frame and the main beam of the beam, and protrudes from the upper and lower ends and the center of the end plate, and is fixed to the steel pipe of the column. It has upper and lower flange plates and a web plate, and a plurality of horizontal stiffeners fixed to a corner formed by the end plate and the web plate. In this case, the horizontal stiffeners particularly correspond to upper and lower flanges of a beam steel frame. Respectively.

Further, a diaphragm and a web plate are respectively protruded from a beam joint portion of the column, and the upper and lower flanges of a metal joint and the web plate are respectively joined to the diaphragm and the web plate.

[0009]

1 and 2 show an embodiment of the present invention. In the drawings, a beam 2 is connected 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 made of a square steel pipe, and the concrete 4 is filled only in the entire length of the steel pipe 3 or only at a joint portion 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 diaphragms 5 are respectively provided so as to protrude horizontally through the portions corresponding to the upper and lower edges of the beam 2 of the steel pipe 3,
The web plate 6 projects vertically between the upper and lower diaphragms 5,5. 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 on the upper and lower sides of a beam steel frame 7 made of H-shaped steel along the axial direction of the beam, and a plurality of shear reinforcing bars 9 are wound therearound at predetermined intervals. A concrete 10 is filled around the beam steel beam 7, the beam main reinforcing bar 8, and the shear reinforcing bar 9 to form a substantially rectangular section. At both ends of the beam 2 formed in this way, metal joints 11 are projected, respectively, and the ends of the beam 2 are joined to the beam joints of the columns 1 via the metal joints 11.

The metal joint 11 has a rectangular plate-like end plate 11a having substantially the same cross-sectional shape as the beam 2, and has a flange plate 11b and a web plate 11c at both upper and lower ends and a center.
Are formed so as to form a substantially H-shaped cross section, and a plurality of horizontal stiffeners 11d are respectively formed at the corners on both sides of the web plate 11c formed by the end plate 11a and the web plate 11c.

The upper and lower flange plates 11b are formed so as to project from the diaphragm 5, and the web plate 11c and the horizontal stiffener 11d are formed so as to correspond to the web 7a and the upper and lower flanges 7b of the beam steel frame 7, respectively. The end plate 11a and the upper and lower flange plates 11b, the end plate 11a and the upper and lower flange plates 11b and the web plate 11c, and the end plate 11a and the horizontal stiffener 11d are all
They are integrally fixed by welding.

The metal joint 11 is connected to an end plate 11a.
The upper and lower flange plates 11b, the web plate 11c, and the horizontal stiffener 11d may be integrally formed by casting.

The metal joint 11 thus formed is welded or bolted to the end of the web 7a and the upper and lower flanges 7b of the beam 7 and to the end of the main bar 8, respectively, by attaching the end plate 11a to both ends of the beam 2. It is protruded from each part. In order to bolt the end of the main bar 8 to the end plate 11a, the end of the main bar 8 penetrates a hole formed in the end plate 11a and is fixed to the end as shown in FIG. The nut 12 is screwed doubly, and the end plate 11a is sandwiched between the two fixing nuts 12 from both sides.

Further, the upper and lower flange plates 11b are welded to the upper and lower diaphragms 5 respectively, and the web plate 11c is bolted to the web plate 6 with joining bolts 13 or
Or, it is fixed to the beam joint of the steel pipe 3 by welding. Thus, the end of the beam 2 is joined to the beam joint of the column 1 via the joint hardware 11.

Since the column 1 and the beam 2 are joined in this way, in particular, the stress transmission from the beam 2 to the column 1 ensures not only the bending moment and the shear force of the RC portion but also the steel frame portion. Therefore, the rebar can be made to work more effectively than the conventional method.

[0017]

The present invention has the above-described structure,
In particular, since the beam side of the metal joint that joins the column and the beam is fixed to both the beam steel and the beam main reinforcement, the stress transmission from the beam to the column is not only the bending moment and shear force of the RC part but also the steel part. It is made surely, and it is more economical because the rebar is used compared to the conventional steel frame-only joint.

[0018] Further, the metal joint is composed of an end plate fixed to the ends of the beam steel frame and the main beam of the beam, and upper and lower flanges protruding from the upper and lower ends and the center of the end plate and fixed to the steel pipe, respectively. Since it is formed having a plate and a web plate, and a plurality of horizontal stiffeners fixed to a corner formed by the end plate and the web plate, the beam of the SRC structure is formed in the same manner as the conventional steel structure. It has the effect of being able to be joined to pillars and to achieve significant labor savings in on-site construction.

Further, since the horizontal stiffeners are respectively fixed so as to correspond to the upper and lower flanges of the beam steel, deformation of the end plate and the like can be prevented. Further, the diaphragm and the web plate are projected from the beam joint of the column, respectively.
Since the upper and lower flanges of the metal joint and the web plate are respectively joined to the diaphragm and the web plate, there is an effect that the joining can be surely made to the pillar.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing a joint between a column having a CFT structure and a beam having an SRC structure, and FIG. 1B is a sectional view taken along line AA of FIG.

2 (a) and 2 (b) are BB in FIG. 1 (a), respectively.
2C is a sectional view taken along line CC, and FIG. 2C is a sectional view taken along line DD in FIG.

FIG. 3 is a longitudinal sectional view 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.

FIG. 4 is a longitudinal sectional view 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 8 Beam main reinforcement 9 Shear reinforcement 10 Concrete 11 Joint metal 11a End plate 11b Flange plate 11c Web plate 11d Horizontal stiffener 12 Fixing nut 13 Joint bolt

Continuing from the front page (72) Inventor Shigeru Hirita Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Nobuaki Yoshioka 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Tokyo Branch Office

Claims (4)

[Claims] At a column-to-beam joint between a column having a steel pipe structure or a concrete-filled steel tube concrete structure and a beam having an SRC structure, a joint metal for joining a column and a beam to a joint between the column and the beam is provided. A steel pipe structure or a column of a filled steel pipe concrete structure characterized by being fixedly installed on a beam steel beam, a beam main reinforcement and a steel pipe of the column, respectively;
Column-beam joints with C-structure beams. 2. An end plate fixed to an end of a beam steel frame and a main beam of a beam, and upper and lower flanges protruding from upper and lower ends and a center of the end plate and fixed to a steel pipe, respectively. The steel pipe structure or filling according to claim 1, wherein the steel pipe structure or filling is formed having a plate and a web plate, and a plurality of horizontal stiffeners fixed to a corner portion formed by the end plate and the web plate. Column-beam joint between a column of steel-tube concrete structure and a beam of SRC structure. 3. The steel pipe structure or the filled steel pipe concrete structure column and the SRC structure according to claim 2, wherein the horizontal stiffeners are respectively fixed so as to correspond to upper and lower flanges of the beam steel frame. Column and beam joints with beams. 4. The method according to claim 1, wherein a diaphragm and a web plate are respectively protruded from a beam joint of the column, and the upper and lower flanges of the metal joint and the web plate are respectively joined to the diaphragm and the web plate. Terms,
Item 4. A column / beam joint between a column having a steel pipe structure or a filled-type steel pipe concrete structure according to claim 2 and a beam having an SRC structure.