JPH07150628A - Joint structure of columns and beams - Google Patents

Abstract

(57) [Abstract] [Purpose] In the joint structure of columns and beams, it is to disperse the stress of the flange of the beam and transmit it to the surrounding shape of the reinforcing member and disperse it to the concrete of the column in a wide range. [Structure] A column-to-beam joint structure A is a joint structure between a reinforced concrete column 1 and a steel beam 2, and an upper reinforcing member 4 is attached to the upper flange 3a at the end of the steel beam 2 at these joints, and a lower portion. Lower reinforcing members 5 are joined to the flanges 3b, respectively. These upper flanges 3a
The lower flange 3b and the lower flange 3b are welded to the side surfaces of the upper reinforcing member 4 and the lower reinforcing member 5, respectively. Further, the upper reinforcing member and the upper flange, and the lower reinforcing member and the lower flange may be manufactured by casting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a reinforced concrete column or a steel tube concrete column and a steel beam.

[0002]

2. Description of the Related Art Various structures have been devised in order to transmit the stress of beams in the joint structure between reinforced concrete columns or steel pipe concrete columns and steel beams. Conventionally, the structure shown in FIG. There is one with a modified structure. In the figure, (1) shows a flat mouth-shaped reinforcing member 10 with a steel beam 20.
The upper flange 30 and the lower flange 30 are welded to each other, and (2) is the flat field-shaped reinforcing member 10 welded to the upper flange 30 and the lower flange 30 of the steel beam 20, respectively.

[0003]

However, in the above flat mouth-shaped reinforcing member, it is necessary to make the plate thickness extremely thick in order to secure rigidity. In addition, in the flat-plate-shaped reinforcing member, the stress from the beam concentrates on the cross plate in the frame body and breaks at the base portion, so that the stress may not be smoothly transmitted to the concrete in the joint. Further, the flat mouth-shaped and flat field-shaped reinforcing members have a problem that the force from the beam is difficult to be uniformly transmitted to the concrete of the pillar and the stress is concentrated on the concrete because the deformation tends to concentrate. That is, the resistance area of concrete has become small.

The present invention has been made in view of such a problem, and an object thereof is to disperse the stress of the flange of the beam to the reinforcing member in the joint structure of the column and the beam to transmit the resistance of the concrete of the column. It was an attempt to increase the cross-sectional area.

[0005]

[Means for Solving the Problems] A column-beam joint structure of the present invention for achieving the above-mentioned object is a steel beam end portion joined to a concrete column at a joint between a concrete column and a steel frame beam. The upper reinforcing member of the plane surrounding type is joined to the upper flange and the lower reinforcing member of the plane surrounding type is joined to the lower flange, respectively.

[0006]

[Operation] By connecting the upper reinforcing member of the plane enclosure to the upper flange of the steel beam end and the lower reinforcing member to the lower flange, the stress of the beam flange is dispersed to the surrounding plate of the reinforcing member. The force is transmitted to the wide area of the concrete of the column by the bearing pressure of the concrete in the enclosure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a column-beam joint structure according to the present invention will now be described in detail with reference to the drawings. 1 is a perspective view of a joint structure between a reinforced concrete column and a steel beam, FIG. 2 is a plan view thereof, and FIG. 3 is a side view of a joint structure between a precast reinforced concrete column and a steel beam.

A column-to-beam joint structure A is a joint structure between a reinforced concrete column 1 and a steel frame beam 2. An upper reinforcing member 4 is formed on the upper flange 3a at the end of the steel frame beam 2 at these joints, and a lower portion is formed on the upper flange 3a. Lower reinforcing members 5 are joined to the flanges 3b, respectively. These upper flanges 3
The a and the lower flange 3b are welded to the side surfaces of the upper reinforcing member 4 and the lower reinforcing member 5, respectively.

The upper reinforcing member 4 and the lower reinforcing member 5 are formed in a plane surrounding shape by welding the well-shaped plates 4b and 5b inside the flat mouth-shaped frames 4a and 5a to facilitate the placing of concrete. , The stress of the beam flange is dispersed to facilitate transmission.

The upper reinforcing member 4 and the upper flange 3a, the lower reinforcing member 5 and the lower flange 3b, the frames 4a and 5a, and the well-shaped plates 4b and 5b can be manufactured by casting, respectively.

Then, as shown in FIG. 3, the upper reinforcing member 4 and the lower reinforcing member 5 are installed on the head of the reinforced concrete column 1 on which the column main bars 6 are projected, and the upper reinforcing member 4 and the lower reinforcing member 4 are installed. 5 and between the reinforcing bars 4 on the upper side of the upper reinforcing member 4, the reinforcing bars 7 are arranged at appropriate intervals, and a frame is assembled around these joints and the column main bars 6 and concrete is poured.

By welding the upper reinforcing member 4 and the lower reinforcing member 5 to the upper flange 3a and the lower flange 3b at the joint end of the steel beam 2 in this manner, the joint of the stress of the beam flange can be dispersed and transmitted. It can be a structure.

FIG. 4 shows a precast reinforced concrete column up to the upper reinforcing member, and FIG. 5 shows a case where all the reinforced concrete columns are made of cast-in-place concrete, and these can be used as necessary. .

FIG. 6 shows another embodiment of the joint structure. (1) shows the end plate 8 between the upper reinforcing member 4 and the lower reinforcing member 5 on which the web 2a of the steel beam 2 is located.
Is provided, whereby the rigidity and proof stress of the joint structure can be improved.

Further, (2) in the figure shows the case where the pillar is made of steel pipe concrete, and the space between the upper reinforcing member 4 and the lower reinforcing member 5 is surrounded by the iron plate 9 to form an integral box body. This is also for the purpose of improving the composition and yield strength of the joint. Even in this case, the upper reinforcing member 4 and the lower reinforcing member 5 can be manufactured by an integral casting.

Further, FIG. 7 shows that the upper reinforcing member and the connecting plate and the lower reinforcing member and the connecting plate are integrally manufactured by casting, respectively, and these are bolted to the steel beam.

[0017]

[Effects of the Invention] At the joint between a concrete column and a steel beam, an upper reinforcing member of a plane enclosure type is provided at an upper flange of an end portion of a steel beam to be joined to a concrete column, and a lower reinforcing member of a plane enclosure is provided at a lower flange. The stress of the flange of the steel beam is dispersed and transmitted to the well-shaped plate of the upper reinforcing member and the lower reinforcing member by joining each of them, and the force is dispersed to the concrete of the pillar by the bearing pressure of the concrete in the well and is smooth. Can be transmitted to.

By forming the upper reinforcing member and the lower reinforcing member in the surrounding shape, the strength of the upper reinforcing member and the lower reinforcing member can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view of a joint structure of columns and beams.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a side view of a column-beam joint structure including precast reinforced concrete columns up to the upper reinforcing member.

FIG. 5 is a side view of a joint structure of columns and beams in which all reinforced concrete columns are made of cast-in-place concrete.

6 (1) and 6 (2) are perspective views of a column-beam joint structure showing another embodiment.

FIG. 7 is a perspective view of a column-beam joint structure according to another embodiment.

8 (1) and (2) are plan views of a conventional column-beam joint structure.

[Explanation of symbols]

 1 Reinforced concrete column 2 Steel beam 3a Upper flange 3b Lower flange 4 Upper reinforcing member 5 Lower reinforcing member 6 Column main bar 7 Rib bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigekazu Yamauchi Toda Construction Co., Ltd. 1-7-1 Kyobashi, Chuo-ku, Tokyo

Claims (1)

[Claims] 1. In a joint between a concrete column and a steel beam, an upper reinforcing member of a plane enclosure type is provided on an upper flange of an end portion of a steel beam to be joined to the concrete column, and a lower reinforcing member of a plane enclosure type is provided on a lower flange. A column-beam joint structure characterized in that the columns are joined together.