JP2022143779A - Joint structure - Google Patents

Abstract

To reduce complexity in design and in construction when mounting a brace on a column-beam joint part.SOLUTION: A joint structure is formed between a steel pipe column, an H-shaped steel beam and a brace. The joint structure includes a first joint part for joining the H-shaped steel beam to the steel pipe column, and a second joint part for joining the brace to the H-shaped steel beam, and does not include a joint part for joining the brace to the steel pipe column.SELECTED DRAWING: Figure 1

Description

The present invention relates to a joint structure.

Since the beam-to-column joint between the steel pipe column and the H-shaped steel beam is a Rahmen structure, there have been few examples of attaching braces in the past. As you can see, the number of cases where braces are used even in rigid-frame structures is increasing.

Japanese Patent Application Laid-Open No. 2020-76208

In a joint structure including braces as described above, for example, as shown in FIG. Join. In this case, as shown in FIG. 6, when an axial force P acts on the brace 4, a shear force S1 and a tensile force T1 act on the joint portion between the square steel pipe column 1 and the gusset plate 3. Since this tensile force T1 acts in a direction that deforms the wall of the rectangular steel pipe column 1 out of plane, it is necessary to keep the tensile force T1 within an allowable range for the strength of the rectangular steel pipe column 1 at the time of design. complicates consideration.

In addition, in the joining structure described above, the lower end of the gusset plate 3 is joined to the diaphragm 5C attached to the square steel pipe column 1 . In order to attach the diaphragm 5C, it is necessary to cut the square steel pipe column 1, insert the diaphragm 5C, and weld the cut square steel pipe column 1 to both sides of the diaphragm 5C. Added to the beam-to-column joint process. In this way, the joint structure for attaching the brace to the column-to-beam joint is complicated in terms of design and construction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a joint structure capable of reducing complexity in design and construction when attaching braces to beam-to-column joints.

[1] A joint structure formed between a steel pipe column, an H-beam and a brace, wherein the first joint joins the H-beam to the steel pipe column and the brace is joined to the H-beam A joined structure including a second joint and not including a joint joining a brace to a tubular steel column.
[2] The joint structure according to [1], wherein the second joint includes a gusset plate that is joined to the H-shaped steel beam and not joined to the steel pipe column, and a brace is joined to the gusset plate.
[3] The joining structure according to [1] or [2], wherein the first joining portion includes a diaphragm attached to the steel pipe column, and the H-shaped steel beam is joined to the diaphragm.
[4] The joint structure according to [1] or [2], wherein the first joint includes a thick steel pipe joined to the end of the steel pipe column, and the H-shaped steel beam is joined to the thick steel pipe. .

According to the above configuration, the axial force acting on the brace is indirectly transmitted to the steel pipe column via the H-shaped steel beam. At the joint between the H-shaped steel beam and the steel pipe column, for example, a diaphragm or a thick steel pipe is joined to the flange of the H-shaped steel beam, so the force transmitted by the axial force acting on the brace causes deformation of the steel pipe column. never let you. Moreover, according to the above configuration, members such as diaphragms for joining the brace to the steel pipe column and processing thereof are not required except for the joining portion between the H-shaped steel beam and the steel pipe column. Therefore, according to the above configuration, it is possible to reduce complexity in design and construction when attaching the brace to the column-to-beam joint.

It is a figure which shows the joining structure which concerns on the 1st Embodiment of this invention. FIG. 2 is a diagram showing the state of stress in the example of FIG. 1; It is a figure which shows the modification of the 1st Embodiment of this invention. It is a figure which shows the junction structure which concerns on the 2nd Embodiment of this invention. It is a figure which shows the joining structure which concerns on a prior art example. FIG. 6 is a diagram showing the state of stress in the example of FIG. 5;

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

(First embodiment)
FIG. 1 is a diagram showing a joint structure according to a first embodiment of the present invention, and FIG. 2 is a diagram showing the state of stress in the example of FIG. A joint structure according to this embodiment is formed between a square steel pipe column 1 , an H-shaped steel beam 2 and a brace 4 . The rectangular steel pipe column 1 is formed of a steel pipe having a rectangular cross section as a whole, specifically, for example, a cold roll-formed rectangular steel pipe. The H-beam 2 is formed of rolled H-beam or welded assembled H-beam and includes an upper flange 2A, a lower flange 2B and a web 2C. The brace 4 is a reinforcing member installed in the diagonal direction of the column and beam structure including the square steel pipe column 1 and the H-shaped steel beam 2 to prevent deformation of the column and beam structure by transmitting tensile force. The brace 4 is made of, for example, various shaped steel materials, steel pipes, or the like.

The joint structure according to the present embodiment includes a first joint that joins the H-shaped steel beam 2 to the square steel pipe column 1 and a second joint that joins the brace 4 to the H-shaped steel beam 2 . The first joint includes diaphragms 5A, 5B attached to square steel pipe column 1, to which upper flange 2A and lower flange 2B of H-beam 2 are welded, respectively. The diaphragm 5A is welded to the end of the square steel pipe column 1. As shown in FIG. The diaphragm 5B is inserted between the cut square steel pipe columns 1, and the square steel pipe columns 1 are welded on both sides. The web 2C of the H-shaped steel beam 2 may also be joined to the square steel pipe column 1 via, for example, a shear plate (not shown).

The second joint includes a gusset plate 3 welded to the lower flange 2B of the H-beam 2 . The brace 4 is joined to the gusset plate 3, for example by welding or bolting. The second joint may further include ribs 61 and stiffeners 62 that are joined to the H-beam 2 . The ribs 61 are welded to the lower flange 2B and the side edges of the gusset plate 3, respectively. The stiffener 62 is welded to the lower flange 2B, web 2C and upper flange 2A at positions corresponding to the ribs 61 . Ribs 61 and stiffeners 62 are placed as needed to stiffen the gusset plate 3 and H-beam 2 .

On the other hand, the joint structure according to the present embodiment does not include the joint portion that joins the brace 4 to the square steel pipe column 1 . Specifically, the gusset plate 3 is not joined to the rectangular steel pipe column 1 at the above-mentioned second joint portion, and other joint members are not arranged between the brace 4 and the rectangular steel pipe column 1. . Therefore, in this embodiment, the force acting on the brace 4 is not directly transmitted to the square steel pipe column 1, and the gusset plate 3, the H-shaped steel beam 2, and the H-shaped steel beam 2 and the square steel pipe column 1 indirectly through a first junction between

According to the above configuration, as shown in FIG. 2, the axial force P acting on the brace 4 acts on the joint portion between the H-shaped steel beam 2 and the gusset plate 3 as shear force S2 and tensile force T2. It is transmitted to the steel beam 2. The force transmitted to the H-shaped steel beam 2 is also transmitted to the square steel pipe column 1 via the first joint, but at the first joint the upper flange 2A and the lower flange 2B of the H-shaped steel beam 2 are Since they are joined to the diaphragms 5A and 5B, respectively, the transmitted force does not cause out-of-plane deformation in the wall of the square steel pipe column 1. Therefore, in the present embodiment, it is possible to reduce complexity in design when attaching the brace to the column-to-beam joint.

Further, according to the above configuration, since the gusset plate 3 is not attached to the square steel pipe column 1, a diaphragm for joining the lower end of the gusset plate 3 to the square steel pipe column 1 (diaphragm 5C shown in the example of FIG. 1 ) need not be installed. In order to attach the diaphragm to the square steel pipe column 1, it is necessary to cut the square steel pipe column 1 and weld the diaphragm. In addition to 5B, no members or processing steps are required for the diaphragm. Therefore, in this embodiment, it is possible to reduce the complexity of construction when attaching braces to the beam-column joints.

In the above example, the brace 4 is joined to the H-shaped steel beam 2 via the gusset plate 3, but the attachment is formed by machining the end of the brace 4 as in the example shown in FIG. The portion 4A may be joined to the H-shaped steel beam 2. Similar to the gusset plate, the attachment portion 4A is joined to the square steel pipe column 1 in terms of complexity in design and construction. It is possible to reduce the complexity of design and construction by not joining to. Also, the members joined by welding in the above example can be joined by other methods such as bolt joining.

(Second embodiment)
FIG. 4 is a diagram showing a joint structure according to a second embodiment of the invention. In this embodiment, the second joint portion that joins the brace 4 to the H-shaped steel beam 2 is constructed in the same manner as in the first embodiment. On the other hand, the first joint for joining the H-shaped steel beam 2 to the rectangular steel pipe column 1 includes a thick steel pipe 8 welded to the end of the rectangular steel pipe column 1 . The thick steel pipe 8 is used for a so-called non-diaphragm type column-to-beam joint, and the upper flange 2A and the lower flange 2B of the H-shaped steel beam 2 are welded to the thick steel pipe 8, respectively. The web 2C of the H-beam 2 may also be joined to the thick steel pipe 8 via, for example, a shear plate (not shown). In addition, since the configuration of the present embodiment is the same as that of the above-described first embodiment except for the points described above, redundant detailed description will be omitted.

In this embodiment as well, by not forming a joint where the brace 4 is joined to the square steel pipe column 1, the design and construction are complicated when attaching the brace to the column-to-beam joint as in the first embodiment. can be reduced. In the case of non-diaphragm type beam-to-column joints using thick steel pipes 8, the relationship between stresses tends to be complicated.

In the above embodiment, an example of a joint structure formed between a square steel pipe column, an H-shaped steel beam, and a brace has been described. of steel pipe columns may be used. Even in that case, deformation of the steel pipe column (diametrical deformation in the case of a circular steel pipe column) can be prevented by indirectly transmitting the axial force acting on the brace to the steel pipe column via the H-shaped steel beam. .

Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is obvious that a person skilled in the art of the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. Naturally, it is understood that it belongs to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1... Square steel pipe column, 2... H-shaped steel beam, 2A... Upper flange, 2B... Lower flange, 2C... Web, 3... Gusset plate, 4... Brace, 4A... Mounting part, 5A, 5B, 5C... Diaphragm, 61 ... Rib 62 ... Stiffener 8 ... Thick steel pipe P ... Axial force S1, S2 ... Shear force T1, T2 ... Tensile force.

Claims (4)

A joint structure formed between a steel pipe column, an H-shaped steel beam and a brace,
a first joint joining the H-beam to the tubular steel column and a second joint joining the brace to the H-beam;
A joint structure that does not include a joint that joins the brace to the steel pipe column. 2. The joint structure according to claim 1, wherein the second joint includes a gusset plate that is joined to the H-beam and not joined to the steel pipe column, and the brace is joined to the gusset plate. The joining structure according to claim 1 or 2, wherein the first joining portion includes a diaphragm attached to the steel pipe column, and the H-shaped steel beam is joined to the diaphragm. 3. The joint according to claim 1 or 2, wherein the first joint includes a thick steel pipe joined to an end of the steel pipe column, and the H-beam is joined to the thick steel pipe. structure.

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