JPH0921180A - Connecting structure of post and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakdown of a ring-shaped body by a shearing force by aligning an opposed part of the ring-shaped body into which a steel pipe post is fitted with a web line of a beam to be connected to the post. SOLUTION: A ring-shaped body 2 having opposed linear areas 2' is formed. A post 1 comprising a steel pipe post or the like if fitted into the ring-shaped body 2, thereby connecting the ring-shaped body 2 and the post 1 by fillet welding. Furthermore, the ends of the beams 4 and 5 are welded (b) with the liner areas 2' of the respective ring-shaped bodies so that the lines of webs 4b and 5b of beams 4 and 5 comprising flanges 4a and 5a and the webs 4b and 5b may be aligned with the line of an opposed area 3 of the ring-shaped body 2. Therefore, in the case when the post 1 is subjected to a shearing force by a lateral load from the beams 4 and 5, no tensile force acts on the opposed areas 3 of the ring-shaped body 2, which makes it possible to protect the ring- shaped body 2 form breaking down. Since the ring-shaped body 2 has two opposed areas 3, the ring-shaped body can be easily connected to the post 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-beam joint structure used in the fields of construction and civil engineering.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 2555972 is known as a beam-column joint structure using an annular body. The column-beam joint structure disclosed in this publication is a joint structure in which an annular body is welded to the outer periphery of a square or round steel pipe and the flange portion of the beam is welded to the annular body.

FIG. 8 is a vertical cross-sectional view of a conventional beam-column joint structure using the annular body disclosed in the above publication.

In FIG. 8, 1 is a column made of a steel pipe column, 20 is an annular body joined to the column by welding a and b, and is welded to the upper and lower two positions in the height direction of the outer peripheral side surface of the column 1. ing.

Upper and lower flange portions 4a and 5a of beams 4 and 5 are joined to the upper and lower annular bodies 20 and 20 by welding c and d, and a plate 6 is welded to a column 1 and the beam 4 is attached to the plate 6. The webs 4c and 5c of 5 are fastened with bolts 8 to form a beam-column joint structure.

Further, in the method of manufacturing the annular body 2 used in the above-mentioned conventional beam-column joint structure, the rod-shaped or plate-shaped steel material is formed into an annular shape by press working or the like, and the opposing portions are welded to each other. The method is generally used. Further, the method for attaching the annular body 20 to a column such as the steel pipe column 1 is as follows. The integral type annular body 20 manufactured by welding the facing portions is used as the column 1
And the annular body 20 is made into a plurality of pieces, the facing portions are arranged on the pillar 1 without welding, and after the plurality of pieces of the annular body 20 and the pillar 1 are welded, the facing portions are integrally welded. Ring 2
There is a method to make it 0.

[0007]

In the above-described conventional beam-column joint structure, the shearing force of the beams 4 and 5 is transmitted to the column 1 via the annular body 20, and the shearing force deforms the annular body 20. When a large shearing force such as a large earthquake acts on the annular body 20, the deformation of the annular body 20 to be absorbed becomes large.

However, the above-described annular body 20 in which the facing portions are welded cannot always absorb the deformation depending on the arrangement of the facing portions, and there is a problem in that the annular body and the column are broken.

That is, in FIG. 9, when the facing portion 20a of the annular body 20 is at the position shown, the shearing force a of the beams 4 and 5 causes the portion of the annular body 20 to move in a direction perpendicular to the surface of the facing portion 20a. The tensile force (b) and the shear force (c) along the welding line of the annular body 20 and the column 1 act.

When the facing portion 20a is welded, the tensile force (b) acts on the weld metal, but since the weld metal has a smaller deformability than the steel material forming the annular body 20, the weld metal portion Easy to destroy.

If the facing portion 20a is not welded, the tensile force (b) does not act, the shearing force (c) becomes large, and there is a problem in that it is also easily broken.

[0012]

The first means for solving the above-mentioned problems is to provide a beam-column joint structure in which a steel pipe column is fitted in an annular body having an opposed portion, and the opposed portion of the annular body is A second aspect of the present invention is a column-beam joint structure characterized by being configured so as to match the web line of the beam joined to the column, wherein the second means uses a split annular body having two opposing portions. It is the beam-column joint structure according to the first means. A third means is the column-beam joint structure according to the first means, which is formed by joining a beam from three directions using a split annular body having three opposing portions.

[0013]

According to the present invention, when the column is subjected to shearing force due to lateral load from the beam, the opposing portion of the annular body is arranged in the direction coinciding with the web line of the beam. Does not work and does not destroy the ring.

Further, by using an annular body having two opposing portions, the same effect as described above can be obtained, and the annular body can be easily joined to the column.

Furthermore, by using an annular body having three opposing portions, the same effect as described above can be obtained, and the annular body can be easily joined to the column, and the beams can be attached from three directions. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a result of studying the relationship between the facing portion of the annular body and the connection position of the beam, the present invention finds that when the facing portion line of the annular body and the web line of the beam are aligned, the above-mentioned annular body 2 is formed. It turned out that the deformation of can be greatly absorbed.

A column-beam joint structure according to the present invention will be described below with reference to an embodiment shown in the drawings.

1 to 4 are explanatory views of an embodiment in which a joint structure of various column beams is formed by using the above-mentioned annular body 2 in the present invention.

FIG. 1 is a plan sectional view showing a column-beam joint structure according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a column made of a steel pipe column or the like. 2 is an annular body, and fillet weld a
Is joined to the pillar 1. Reference numeral 3 denotes an opposed portion of the annular body 2, which may or may not be welded.
Beams 4 and 5 are welded at their ends to the linear portion 2'of the annular body 2. The beams 4, 5 are composed of flanges 4a, 5a and webs 4b, 5b.

According to the present invention, the lines of the webs 4b and 5b of the beams 4 and 5 and the lines of the facing portion 3 are attached so as to coincide with each other as shown in the drawing, and when a tensile force acts on the beams 4 and 5, they face each other. Since the portion 3 is arranged in line with the beam direction, no tensile force acts and it is absorbed only by the deformation of the annular body 2.

FIG. 2 is a side view of the present invention according to FIG.
As described above, the beams 4 and 5 have the flanges 4a and 5a formed of the annular body 2.
To the lower flange 4 of the beams 4, 5 joined by welding b to
c and 5c are also joined to the lower annular body 2 by welding b.

The webs 4b and 5b of the beams 4 and 5 are formed by the pillar 1
May be welded to the plates 6,6 welded to the sides of the web, or the ends of the webs 4b, 5b may be welded directly to the post 1.

FIG. 3 is a plan cross-sectional view showing a column-beam joint structure according to the second embodiment of the present invention. In FIG. 3, an annular body 2 is a split type divided body composed of a facing portion 3 on the beam 4 side and a facing portion 3 on the beam 5 side, and the facing portions 3 and 3 are welded in the same manner as in the first embodiment. Or may not be welded. Since the welding of the pillar 1 and the annular body 2 and the welding of the annular body 2 and the beams 4, 5 are the same as those in the first embodiment (FIGS. 1 and 2) described above, the illustration thereof is omitted.

Also in the case of the present invention, the facing portions 3, 3 of the annular body 2 are
Are arranged in a direction corresponding to the web lines of the beams 4 and 5.

FIG. 4 is a plan sectional view showing a column-beam joint structure according to the third embodiment of the present invention. In FIG. 4, the annular body 2 is a three-divided annular body, and the facing portion 3 on the beam 41 side is used.
And the facing portion 3 on the side of the beam 51 and the facing portion 3 on the side of the beam 61. The facing portions 3 at the three places are welded in the same manner as in the first and second embodiments, or are not welded. May be. In addition, the welding of the pillar 1 and the annular body 2 and the annular body 2 and the beam 4
Welding with Nos. 1, 51 and 61 is the same as in the first embodiment (FIGS. 2 and 3) described above, and therefore illustration thereof is omitted.

Also in the case of the present invention, the facing portions 3 of the annular body 2 at the three positions are the beams 41, 51 and the webs 41b, 51 of the beams 61.
It is arranged in a direction coinciding with lines b and 61b.

FIGS. 5A, 5B and 5C are perspective views of an annular body used in the above-described beam-column joining structure of the present invention.

In FIG. 5A, the facing portion 3 is the annular body 2 at one location, and the linear portions 2'for beam mounting are formed at two locations on the left and right sides. , FIG. 2).

In FIG. 5B, the opposing portion 3 is the annular body 2 at two locations, and the beam attachment straight portions 2'are formed on the left and right sides in the same manner as in FIG. 5A. It is used in the second embodiment (FIG. 3) described above, and has a feature that it is light in weight to be attached to the column. Workability is improved.

In FIG. 5C, the facing portion 3 is the annular body 2 at three locations, and the linear portions 2'for beam attachment are formed at three locations to form a three-divided body. It is used in the embodiment (FIG. 4) and has a feature that it can be attached to a pillar in a light weight and can be attached to beams from three directions.

Next, FIG. 6 (plan view) and FIG. 7 (A-A cross-sectional view of FIG. 6; hatching for displaying cross sections of the webs 51 and 61 are omitted) are used for confirming the effect of the present invention. It is a test piece of the joint structure of pillars and beams.

The structure is such that the annular body 2 is welded to the column 1 and the webs 42 and 52 of the beam are welded to the annular body 2.

In the experiment, a tensile test in the direction of arrow B in FIG. 7 was carried out using the following four types of test bodies at the four facing portions a, b, c and d of the annular body 2 in FIG. .

Forming the facing part of the annular body 2 only: with welding Forming the facing part of the annular body 2 only: not welding Forming facing part of the annular body 2 b and c: welding Only facing the annular body 2 b and d Part formation: With welding Specimen size (mm): Steel pipe column: 150φ × 8, annular body: Outer diameter 180φ × thickness 12 was attached at 50 intervals above and below the steel pipe column.

The results show that in the specimens shown in the above items 1 to 3, tensile force does not act on the facing portion,
The tensile force acted and it broke.

[0036]

As described above, according to the present invention, when the facing portion line of the annular body is aligned with the web line direction of the beam to form the column beam, the shearing force acting on the annular body via the beam is reduced. It is absorbed by the annular body, and the facing part does not break.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a first embodiment according to the present invention.

2A and 2B are side views of the first embodiment according to the present invention.

FIG. 3 is a plan sectional view of a second embodiment according to the present invention.

FIG. 4 is a plan sectional view of a third embodiment according to the present invention.

5A to 5C are perspective views of an annular body according to the present invention.

FIG. 6 is a plan sectional view of a test body used in a tensile test for comparison between the present invention and a conventional technique.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a prior art beam-column joint structure.

FIG. 9 is a plan view illustrating a shearing force that acts on a connection structure of a column and a beam of a conventional technique.

[Explanation of symbols]

 1 pillar 2 annular body 3 facing portion of annular body 4 beam 5 beam 6 plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masataka Oshima 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (3)

[Claims] 1. In a beam-column joining structure configured by fitting a steel pipe column into an annular body having an opposed portion, the opposed portion of the annular body is configured so as to coincide with a web line of a beam joined to the column. The column-beam joint structure is characterized in that 2. The column-beam joint structure according to claim 1, wherein the divided annular body has two opposing portions. 3. The column-beam joint structure according to claim 1, wherein the columnar beam is joined to the beam from three directions by using a split annular body having three facing portions.