JPH11181881A - Connective structure of column with box section and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connective structure of a column with a box section and a beam that can transmit reliably stress acting on the beam to the box- section column in a connection between the box-section column and the beam having flanges at the upper and lower edges of a web of a steel structure. SOLUTION: A connective structure of a column 10 with a box section and a beam 11 having flanges 11a at the upper and lower edges of a web 11b. A diaphragm 12 is inserted into the box-section column 10, the end of the flange 11a of the beam 11 is connected to the diaphragm 12, the end of the web 11b is joined to the side wall of the box-section column 10, and an intermediate diaphragm 15 is provided in the box-section column 10 located between the flanges 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a box-shaped column such as a steel pipe column and a beam having flanges at upper and lower edges of a web such as an H-section steel.

[0002]

2. Description of the Related Art Generally, when a beam such as an H-section steel is connected to a box-shaped column (box column) such as a steel-framed steel tube column, the beam strength is transmitted to the box-shaped column at a joint portion. For this purpose, a diaphragm made of a steel plate is interposed, and a flange of a beam is joined to the diaphragm. FIGS. 7 to 10 show a conventional joint structure between a box-shaped column and a beam of this type. In the figures, reference numeral 1 denotes a box-shaped column (hereinafter abbreviated as a column), and reference numeral 2 denotes a column. Is a beam made of H-section steel. A rectangular plate-shaped diaphragm 3 is interposed on the pillar 1 at a position facing the upper and lower flanges 2a of the beam 2, and the upper and lower diaphragms 3 are respectively provided with the flanges 2 of the beam 2.
The ends of “a” are joined by butt welding 4. The end of the web 2 b of the beam 2 is joined to the side surface of the column 1 by fillet welding 5.

[0003]

By the way, in such a conventional joint structure between a column and a beam, a diaphragm 3 is used.
Aims at performing stress transfer at the junction of the pillar 1 and the beam 2 smoothly by, for now out of the bending moment M acting on the beam 2, for the bending moment M _F flange bear, butt welds 4 and can be transmitted to the column 1 via the diaphragm 3. However, the bending moment M _w borne by the web 2b is shown in FIG.
As shown in FIG. 0, since the skin plate 1a of this type of column 1 is easily deformed,
There was a problem that it could not be transmitted to.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the above-described conventional joint structure between a box-shaped column and a beam, and has a steel box-shaped column and a flange at upper and lower edges of a web. It is an object of the present invention to provide a joint structure between a box-shaped column and a beam that can surely transmit the stress acting on the beam to the box-shaped column at a connection portion with the beam.

[0005]

According to a first aspect of the present invention, there is provided a joint structure between a box-shaped section column and a beam according to the present invention, comprising a steel box-shaped section column and a beam having flanges at upper and lower edges of a web. The connection structure of the above, wherein a diaphragm is interposed in the box-shaped cross-section column, and the end of the flange of the beam is joined to this diaphragm, the end of the web is joined to the side wall of the box-shaped cross-section, and An intermediate diaphragm is provided inside a box-shaped column located between the flanges.

Here, the invention according to claim 2 is characterized in that the intermediate diaphragm is provided in the box-shaped cross-section column and at an intermediate position between flanges of the beam or below it. It is assumed that. Further, in the invention according to claim 3, the box-shaped section pillar according to claim 1 or 2 is a filled steel pipe concrete pillar, and a hole for concrete filling is formed in each of the diaphragm and the intermediate diaphragm. It is characterized by having been done.

In the joint structure of the box-shaped section column and the beam according to any one of claims 1 to 3, since the intermediate diaphragm is provided inside the box-shaped section column located between the flanges of the beam, The deformation of the skin plate of the column is restrained by the intermediate diaphragm, so that the stress borne by the web is reliably transmitted to the box-shaped column. Therefore, together with the stress transmitted from the flange to the box-shaped column through the diaphragm, the total stress acting on the beam can be reliably transmitted to the box-shaped column.

Here, since the floor slab is generally cast on the upper flange of the beam, the proof stress at the upper part of the beam is improved by the combined effect with the rigidity of the floor slab. In such a case, as in the invention described in claim 2, if the intermediate diaphragm is provided in the box-shaped cross-section column and provided at an intermediate position between the flanges of the beam or below this,
It is possible to more effectively transmit the stress that the web bears to the box-shaped column. The joint structure between the box-shaped column and the beam according to claim 1 or 2 is not limited to a box-shaped column such as a general steel pipe column, but may be a filling type as in the invention according to claim 3. The present invention can also be applied to steel pipe concrete columns. In this case, holes for concrete filling may be formed in the upper and lower diaphragms and the intermediate diaphragm.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a joint structure of a box-shaped column and a beam according to the present invention. 1 to 3 show a first embodiment of the present invention. In the drawings, reference numeral 10 denotes a box-shaped cross-section column made of a steel pipe (hereinafter, also abbreviated as a column), and reference numeral 11 denotes H. It is a beam made of shaped steel. The column 10 is provided with diaphragms 12 made of a rectangular steel plate somewhat larger than the cross section of the column 10 at the upper and lower flanges 11 a of the beam 11, and the upper and lower diaphragms 12 are respectively provided with the flanges of the beam 11. The ends of 11a are joined by butt welding 13. The end of the web 11 b of the beam 11 is joined to the side surface of the column 10 by fillet welding 14. further,
An intermediate diaphragm 15 made of a square steel plate is joined inside the column 10 and at an intermediate position between the upper and lower flanges 11a. Here, instead of the above-mentioned intermediate diaphragm 15, a slit-type intermediate diaphragm 16 constituted by two steel plates 16a arranged on the joint surface side of each web 11b is provided as in a modification shown in FIG. Is also good.

According to the joint structure of a column and a beam having the above-described structure, as shown in FIG. 3, the intermediate diaphragm 15 or the intermediate diaphragm 15 is provided inside the column 10 and at an intermediate position between the upper and lower flanges 11a of the beam 11. Since the 16 is provided, the deformation of the skin plate 10a of the column 10 is restrained by the intermediate diaphragm 15 or 16, so that the bending moment _Mw borne by the web 11b is reliably transmitted to the column 10. As a result, the bending moment M transmitted from the flange 11a to the column 10 via the diaphragm 12
Together with _F , all of the bending moment M acting on the beam 11 can be reliably transmitted to the column 10.

FIG. 5 shows a second embodiment of the present invention. The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and their description is omitted. In FIG. 5, reference numeral 20 denotes a floor slab constructed on the upper flange 11a of the beam 11. In this joint structure, an intermediate diaphragm 21 provided in the column 10 is provided in the column 10 below a middle position between the upper and lower flanges 11 a of the beam 11.

According to the joint structure of the column and the beam having such a configuration, the combined strength of the upper flange 11a and the rigidity of the floor slab 20 improves the proof stress at the upper portion of the beam 11 as compared with the lower flange 11a side. . Since the intermediate diaphragm 21 is provided in the column 10 and below the intermediate position between the upper and lower flanges 11a of the beam 11, the same operation and effect as those of the first embodiment can be obtained.
More effectively to prevent deformation of the skin plate 10a of the pillar 10, a bending moment M _F web 11b will bear can be transmitted to the pillar 10.

In the first and second embodiments, the case where the present invention is applied to a box-shaped column such as a steel pipe column has been described. However, the present invention is not limited to this. For example, FIG. As shown in the figure, the present invention can also be applied to a filled steel pipe concrete column 30 in which concrete is press-fitted and solidified in a steel pipe and integrated. In this case, concrete filling holes 31 may be formed in the upper and lower diaphragms (not shown) and the intermediate diaphragm 32 provided at a predetermined position inside the steel pipe 30a. Also, the shape of the column 10 is not limited to a rectangular shape using a steel tube as described above, and the present invention can be applied to various box-shaped cross-sectional columns such as a polygonal shape. is there.

[0014]

As described above, according to the joint structure between the box-shaped column and the beam according to any one of claims 1 to 3,
Since the intermediate diaphragm is provided inside the box-shaped cross section located between the flanges of the beam, the deformation of the skin plate of the column is restrained by this intermediate diaphragm, and as a result, the stress borne by the web is reliably reduced to the box cross section. Since the force is transmitted to the column, the total stress acting on the beam can be reliably transmitted to the box-shaped column together with the stress transmitted to the box-shaped column from the flange via the diaphragm.

Here, according to the invention described in claim 2,
Especially when the floor slab is cast on the upper flange of the beam, the web bears more effectively even when the proof stress at the upper part of the beam is greatly improved due to the combined effect with the rigidity of the floor slab. The effect that it becomes possible to transmit the stress to the box-shaped column is obtained.
As described in the invention described in (1), by forming a hole for concrete filling in each of the diaphragm and the intermediate diaphragm, the present invention can be applied to a filled steel pipe concrete column.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a joint structure between a box-shaped column and a beam according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 illustrates a modification of the first embodiment,
FIG. 3 is a cross-sectional view corresponding to line III.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a conventional joint structure between a box-shaped column and a beam.

8 is a sectional view taken along line VIII-VIII in FIG. 7;

9 is a sectional view taken along line IX-IX of FIG. 7;

FIG. 10 is a sectional view showing a modified state of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Column (box-shaped section pillar) 11 Beam 11a Flange 11b Web 12 Diaphragm 15, 16, 21, 32 Intermediate diaphragm 20 Floor slab 30 Filled steel pipe concrete column 31 Concrete filling hole

Claims (3)

[Claims] 1. A connection structure between a steel box-shaped section pillar and a beam having flanges at upper and lower edges of a web, wherein a diaphragm is interposed in the box-shaped section pillar, and the beam flange is attached to the diaphragm. The end of the web is joined to the side wall of the box-shaped section column, and an intermediate diaphragm is provided inside the box-shaped section located between the flanges. Joint structure of box-shaped section columns and beams. 2. The box according to claim 1, wherein the intermediate diaphragm is provided in the box-shaped cross-section column and at an intermediate position between flanges of the beam or below the beam. Joint structure between column and beam. 3. The concrete column according to claim 1, wherein the box-shaped section column is a filled steel pipe concrete column, and a hole for concrete filling is formed in each of the diaphragm and the intermediate diaphragm. The joint structure between the box-shaped section column and the beam described in (1).