JPH11124907A - Square steel pipe having column-beam joining part excellent in joint efficiency - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve joint efficiency by welding vertical stiffeners to inner diaphragms installed in the upper and lower parts of a column-beam joining part of a square steel pipe so as to cross at right angles to the pipe axis and the inside surface of the square steel pipe. SOLUTION: When a square steel pipe is manufactured, first of all, upper and lower inner diaphragms 2 and 2 are welded to U-steel. Next, vertical stiffeners 4 are fixed by welding its three sides to the upper and lower inner diaphragms and the web of the U-steel. Next, vertical stiffeners 3 are fixed to left and right surfaces being a column surface having a welding line of the square steel pipe and the upper and lower inner diaphragms 2 and 2 by welding its four sides. In this way, since the three sides or the four sides of the vertical stiffeners are completely fixed, a fixing degree of the vertical stiffeners 3 and 4 increases, and as a result, out-of-plane flexural rigidity of a column flange increases more than a stiffener case. Therefore, joint efficiency of a joining part can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square steel pipe having a beam-column joint having excellent joint efficiency.

[0002]

2. Description of the Related Art Square steel pipes are widely used for steel structures because of their high rigidity in section and easy on-site construction. However, when a square steel pipe is used as a column and a beam is joined to the flange surface, which is the side surface, there is a problem that the rigidity of the flange surface is low and the joint efficiency is reduced. To solve this problem, a proposal has been made to improve the bending rigidity of the column flange surface by welding a section steel as a vertical stiffener to the inner surface of the column flange (Japanese Patent Application Laid-Open No. H03-39534).

[0003] This method has an advantage that the vertical stiffener can be easily attached to the inner surface of the column because it is welded. However, since the degree of fixation of the vertical stiffener is low, the bending rigidity of the vertical stiffener itself is required to be high,
If a normal steel plate is used for the vertical stiffener, the joint efficiency will not be sufficiently improved. In addition, since it is not integrated with the diaphragm, there is a disadvantage in that the transmission of force from the beam web is not reliably performed.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rectangular steel pipe having a column-beam joint having excellent joint efficiency by increasing the degree of fixing of a vertical stiffener when assembling the rectangular steel pipe.

[0005]

SUMMARY OF THE INVENTION The present invention is to improve the joint efficiency by increasing the degree of fixation of the vertical stiffener and smoothing the stress transmission from the beam web. It is in square steel pipe.

(1) A square steel pipe having a vertical stiffener parallel to a pipe axis on an inner surface, in which two channel steels are welded and assembled, and pipes are provided at an upper part and a lower part of a beam-column joint of the square steel pipe. A square steel pipe having a column-beam joint with excellent joint efficiency, in which a vertical stiffener is welded to an inner diaphragm mounted perpendicular to the axis and an inner surface of the square steel pipe.

(2) The rectangular steel pipe according to (1), wherein at least two of the vertical stiffeners are further welded to each other.

[0008] Here, the "inner surface of the square steel pipe" refers to the inner surface of the square steel pipe, both the surface having the welding line and the surface without the welding line, where two channel steels are welded. “Pipe axis” refers to an axis (virtual axis) parallel to the longitudinal direction of the rectangular steel pipe passing through the center of the rectangular cross section of the rectangular steel pipe.

The invention described above is characterized in that the efficiency of the joint is increased by increasing the degree of fixation of the vertical stiffener attached to the beam-column joint of the rectangular steel pipe. The reason why the degree of fixing of the vertical stiffener can be increased without a large increase in cost in actual operation is that the square steel pipe is a welded and assembled square steel pipe. That is, at the stage of the channel steel, the vertical stiffeners are welded and attached, and then the channel steels with the vertical stiffeners attached are welded to each other,
The degree of fixation of the vertical stiffener can be easily increased. However, in the case of an integrated inner diaphragm, as shown in FIG. 5 described later, after the channel steel is welded to form a square steel pipe, a hole is made in the welded portion and the inner diaphragm is integrally welded. You. "Inner diaphragm" of the above invention
Also includes such an integrally welded inner diaphragm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

1. Material The material of the channel steel, the inner diaphragm, and the vertical stiffener may be a steel material, and the material does not matter. The strength level may be an ordinary steel level having a tensile strength (TS) of 400 MPa or a high-tensile steel level. The welding material in the welding process described later is made to correspond to the material to be welded such as a channel steel. In general, since the channel steel is generally TS400 MPa class ordinary steel, the diaphragm and the vertical stiffener are also made of mild steel, and the welding material is mainly a material for ordinary steel.

2. Vertical stiffener The vertical stiffener 3 to be welded to the inner surface of the square steel pipe may not be a single piece, but may be divided into two pieces, and the two pieces may be used to hold the vertical stiffener 4 and weld it at the location. Good. The above invention (2) is a square steel pipe provided with a column-beam joint having such a vertical stiffener. That is, the mutual welding of the vertical stiffeners is performed by two stiffeners welded to the opposite inner surfaces of the square steel pipe, two stiffeners mutually orthogonally welded to the inner surface of the square steel pipe, or three or three of these stiffeners. The four stiffeners may be integrally welded.

3. Inner Diaphragm The inner diaphragm is usually structured such that the inner diaphragm is separated into two pieces (in the case of FIGS. 1 and 2 described later), but the inner diaphragm separated into two pieces is joined by welding or the like. You may. From the viewpoint of increasing the degree of fixation, it is preferable that they are connected. The inner diaphragm to be connected may be both upper and lower, or either one. As described above, it goes without saying that the present invention includes both the case where the inner diaphragm is divided into two pieces and the case where the inner diaphragm is integrated by welding.

[0013]

Next, embodiments of the present invention will be described.

FIG. 1 is a view exemplifying a rectangular steel pipe provided with a beam-column joint according to the present invention when the inner diaphragm is divided into two pieces. FIG. 1A is a longitudinal sectional view of a beam-column joint, and FIG.
FIG. 1B is a cross-sectional view taken along the line II in FIG.
(C) is a longitudinal sectional view showing the position of the inner diaphragm, FIG.
(D) is a cross-sectional view of the inner diaphragm taken along the line II-II in (c). A vertical stiffener as shown in FIG. 1 is welded to the inner surface of a rectangular steel pipe so that there is no practical problem because the rectangular steel pipe is formed by welding and assembling two channel steels as shown in FIG. It is closely tied to things.

FIG. 2 is a diagram showing a procedure for manufacturing a rectangular steel pipe having the column-to-column joint shown in FIG. First, channel steel 6
The upper and lower inner diaphragms 2 and 2 are welded to each other (see FIG. 2).
(a)). Then, as shown in FIG. 2B, the vertical stiffener 4 is fixed to the upper and lower inner diaphragms and the web of the channel steel by welding three sides thereof. Next, as shown in FIG. 2 (c), the vertical stiffener 3 is fixed to the right and left surfaces and the upper and lower inner diaphragms 2 and 2 having the welding line of the rectangular steel pipe by welding the four sides thereof. FIG. 2 (c) shows a case where the vertical stiffener 3 fits between the upper and lower inner stiffeners. However, the vertical stiffener 3 does not fit between the upper and lower inner diaphragms 2 and 2, and FIGS. As shown in c), the upper and lower inner diaphragms 2 and 2 may be mounted on each other, and the four sides of the vertical stiffener 3 can be easily welded. Similarly, vertical stiffeners 3, 4
The other channel steel 6 to which is fixed is manufactured, and FIG.
When both are welded as shown in Fig. 7, a square steel pipe having a vertical stiffener is completed.

A manufacturing procedure in which the vertical stiffener 3 is divided into two and the vertical stiffener 4 is sandwiched and welded will be described with reference to FIG.

FIG. 3 is a view showing a procedure for manufacturing a square steel pipe when the above-described vertical stiffener 3 is divided into two pieces. In FIG. 3 (c), two vertical stiffeners 3 sandwich one vertical stiffener 4, and the three vertical stiffeners are welded to each other at a sandwiched portion. 3A, 3B, and 3D are the same as FIG. The vertical stiffener 4 to be sandwiched and welded by the two divided vertical stiffeners 3 and, therefore, the vertical stiffener 3 is also eventually welded and fixed on its four sides. It is much better than that. In this case, the portion to be welded may not necessarily be the edge portion of the vertical stiffener, but may be a portion that is somewhat inside from the edge.

Further, the vertical stiffener may be composed of only the vertical stiffener welded only to the column surface having no welding line.

FIG. 4 is a view showing a structure in which the inner diaphragm is not divided but is integrated by welding. FIG.
4A is a longitudinal sectional view of a beam-column joint, and FIG. 4B is a sectional view taken along the line II shown in FIG. FIG. 4C is a longitudinal sectional view showing the position of the inner diaphragm, and FIG. 4D is a sectional view taken along the line II-II. The arrangement of the vertical stiffeners 3 and 4 is the same as in FIG. As shown in FIG. 4D, the integrated inner diaphragm 2 is welded at the center.

FIG. 5 is a diagram showing a manufacturing procedure for joining the inner diaphragm shown in FIG. FIG. 5A shows a state in which the inner diaphragm is divided into two pieces as in FIG. FIGS. 5 (b) and 5 (c) schematically show how a drill 8 is formed at a right angle to the column flange surface at the welding line at the inner diaphragm position. FIG. 5D schematically shows a state in which a welding material is inserted into the hole to weld the two inner diaphragms.
The welding is performed by SES welding.

[0021]

The present invention has the following effects and can provide a general-purpose member useful for the construction-related industry.

1. Since three or four sides of the vertical stiffener are completely fixed, the degree of fixing of the vertical stiffener is increased, and as a result, the out-of-plane bending stiffness of the column flange is dramatically increased as compared with the case of the stiffener, and the joint of the joint is joined. High efficiency can be achieved.

2. Since the diaphragm is reinforced by a vertical stiffener, the strength of the joint increases in all directions.

[Brief description of the drawings]

FIG. 1 is a view showing a rectangular steel pipe provided with a column-beam joint according to the present invention when an inner diaphragm is separated into two pieces. (A)
Is a longitudinal sectional view of a beam-column joint, (b) is a transverse sectional view of a central portion of a beam-column, (c) is a longitudinal sectional view showing a position of an inner diaphragm,
(D) is a cross-sectional view of the inner diaphragm.

FIG. 2 is a view showing a procedure for manufacturing a rectangular steel pipe having a column-beam joint according to the present invention when the inner diaphragm is separated into two pieces. (A) shows upper and lower inner diaphragms 2 and 2 on a channel steel 6.
Indicates the stage of welding. (B) shows the stage in which the vertical stiffener 4 is welded on its three sides to the upper and lower diaphragms and the channel steel web. (C) shows the stage where the four sides of the vertical stiffener 3 are welded to the inner surfaces of the left and right flanges having welding lines and the upper and lower diaphragms 2 and 2. (D) shows the stage in which the two channel steels are joined and welded.

FIG. 3 is a view showing a procedure for manufacturing a square steel pipe according to [Invention 4]. (C) shows the stage in which the vertical stiffener 3 separated into two pieces sandwiches the vertical stiffener 4 and the three vertical stiffeners are welded to each other. (A), (b) and (d) are the same as FIG.

FIG. 4 is a diagram showing a beam-column joint having a joined inner diaphragm. (A), (b), (c), and (d) are the same as those in FIG.

FIG. 5 is a diagram showing a procedure for joining an inner diaphragm separated into two pieces. (A) shows a state where the inner diaphragm is separated into two pieces. (B), (c) schematically shows a state where a hole is formed in the welding line at a position perpendicular to the column flange surface at the inner diaphragm position. (D) schematically shows how the two inner diaphragms are welded from the holes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rectangular steel pipe 2 ... Diaphragm 3 ... Vertical stiffener 4 ... Vertical stiffener 5 ... Column welding line 6 ... Channel steel 7 ... Diaphragm welding line 8 ... Drill 9 ... Welding material of SES welding

Claims (2)

[Claims] 1. The two channel steels are welded and assembled.
A square steel pipe having a vertical stiffener parallel to the pipe axis on the inner surface, wherein the inner diaphragm and the inner face of the square steel pipe are attached perpendicularly to the pipe axis at the upper and lower portions of the beam-column joint of the square steel pipe. A square steel pipe having a beam-to-column joint having excellent joint efficiency, wherein a stiffener is welded. 2. The rectangular steel pipe according to claim 1, wherein at least two of the vertical stiffeners are further welded to each other.