JP2023058794A - Column-beam joint structure - Google Patents

Abstract

To provide a column-beam joint structure, which is provided with a column part, a column side beam part projected from the column part to a side direction, and a central side beam part jointed to the column side beam part through a joint part, allowing earthquake performance to be sufficiently reinforced as preventing interference with the joint part through employing a rational structure.SOLUTION: A column-beam structure is provided with: a panel zone expansion part 50 jointed to each of a column part 10 and a column side beam part 20 to expand a panel zone P along a direction inside of a structure plane; and a brace part 60 installed over the panel zone expansion part 50 and a central side beam part 30.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a column-to-beam joint structure for joining a column and a beam.

As a conventional column-to-beam joint structure, seismic performance is reinforced by providing a panel zone expansion part that is joined to each of the steel frame column and beam and expands the panel zone along the structure plane. is known (see Patent Document 1, for example). The panel zone refers to an area surrounded by the range up to the plastic hinge on the column side and the range up to the plastic hinge on the beam side at the column-to-beam joint.
As another column-to-beam joint structure, in the case where the center side beam is connected to the column side beam protruding sideways from the column through the joint, It is known to reinforce the seismic performance by constructing a brace part over the beam part (see Patent Document 2, for example).

JP 2018-104995 A JP 2008-088641 A

In the column-to-beam joint structure described in Patent Document 1, when the central side beam portion is connected to the column side beam portion protruding sideways from the column portion via the joint portion, in the panel zone expansion portion, It is necessary to remove the part that interferes with the joint. As a result, the joining length of the panel zone expansion portion to the beam portion is shortened, and the expansion range of the panel zone is reduced, resulting in a problem that a sufficient reinforcing effect cannot be obtained. In addition, when the panel zone extension part is attached in a form straddling the joint part, there arises a problem that construction becomes complicated.
On the other hand, as in the beam-to-column joint structure described in Patent Document 2, in the case where the brace portion is constructed across the column portion and the central side beam portion, the brace portion becomes relatively long. , it is necessary to significantly increase the strength of the brace.
In view of this situation, the main object of the present invention is to provide a pillar, a pillar-side beam projecting laterally from the pillar, and a center-side beam connected to the pillar-side beam through a joint. To provide a technique capable of sufficiently reinforcing seismic performance while suppressing interference with a joint part while adopting a rational structure in a column-to-beam joint structure having a part and a part.

A first characteristic configuration of the present invention includes a column portion, a column side beam portion projecting sideways from the column portion, a central side beam portion connected to the column side beam portion via a joint portion, A column-to-beam connection structure comprising
a panel zone extension part that is joined to each of the column part and the column side beam part and extends the panel zone along the structural plane direction;
It is characterized in that it includes a brace section that spans over the panel zone extension section and the central side beam section.

According to this configuration, since the panel zone extension part is joined to the column side beam part from the side surface of the column part to the joint part in the beam part, interference between the panel zone extension part and the joint part is avoided. The panel zone extension can be easily installed. By attaching the panel zone expansion part in this way, the panel zone between the column part and the beam part can be expanded to the vicinity of the joint part along the beam part. Furthermore, since the cross section is constructed in a form straddling the joint part over the panel zone extension part extending at least to the vicinity of the joint part along the beam part and the central side beam part connected to the joint part, the comparison The panel zone expanded by the panel zone expansion part can be evaluated more greatly while adopting a relatively short brace part.
Therefore, according to the present invention, there is provided a column portion, a column side beam portion projecting sideways from the column portion, and a center side beam portion connected to the column side beam portion via a joint portion. In the beam-to-column joint structure, it is possible to provide a technique that can sufficiently reinforce the seismic performance while suppressing interference with joints while adopting a rational structure.

A second characteristic configuration of the present invention is that a diaphragm is provided below a joint portion between the column portion and the column-side beam portion,
The panel zone extension is joined to each of the column, the column side beam and the diaphragm.

According to this configuration, the panel zone extension part joined to each of the column part and the column side beam part is also joined to the diaphragm provided on the lower side of the joint part of the column part with the column side beam part. become a thing. As a result, the joint portion of the panel zone extension portion to the column portion is reinforced by the diaphragm, and the panel zone extension portion is firmly integrated with the column portion and the column-side beam portion, thereby forming the panel zone. Expansion can be performed reliably.

A third characteristic configuration of the present invention resides in that a small beam is joined to the joint portion of the cane portion in the central side beam portion.

According to this configuration, the joint portion of the central side beam portion to which the axial force is transmitted from the cane portion can be reinforced by the small beam.

In the fourth characteristic configuration of the present invention, the panel zone extension part has a rectangular panel area having two sides of the joint part of the column part and the joint part of the column-side beam part, and from the panel area to the center of the beam. a laterally extending brace joint region;
It is in that the said brace part is joined to the said brace joint area|region.

According to this configuration, in the panel zone expansion part, the rectangular panel area having the joint part of the column part and the joint part of the column side beam part on two sides is the square joint area to which the square part is joined. secured separately. This avoids the occurrence of a cross-sectional defect due to the connection of the brace portion in the panel region, so that the panel zone can be reliably expanded by the panel region.

Elevation view of the beam-to-column joint structure of the present embodiment AA sectional view of FIG.

An embodiment of the present invention will be described based on the drawings.
As shown in FIGS. 1 and 2, the beam-to-column joint structure (hereinafter referred to as "main beam-to-column joint structure") 100 of the present embodiment has a beam-to-column joint 15 in a column portion 10 made of a steel pipe 11. It is configured to join beam portions 20 and 30 made of H-shaped steels 21 and 31 . The beams 20 and 30 have column side beams made of H-shaped steel 21 whose base ends are welded and fixed to the beam joining diaphragm 16 provided in the column 10 and protrude sideways from the column 10. A portion 20, a center side beam portion 30 made of H-shaped steel 31 located on the center side of the column side beam portion 20, and a joint portion 40 that connects these in a butted state are provided. The joint portion 40 fastens the upper and lower flanges 22, 23 and the web 25 of the column-side beam portion 20 and the upper and lower flanges 32, 33 and the web 35 of the center-side beam portion 30 with high-strength bolts 45, 46. It is configured to be connected by splice plates 41 and 42 which are connected to each other.
And, this column-to-beam joint structure 100 adopts a configuration for sufficiently reinforcing the earthquake resistance performance while suppressing interference with the joint part 40 while adopting a rational structure, details of which are described below. Add explanation.

The column-to-beam joint structure 100 is provided with a panel zone extension portion 50 joined to each of the column portion 10 and the column-side beam portion 20 up to the joint portion 40 . Such a panel zone extension part 50 has a range Pz to the plastic hinge on the side of the column part 10 and a range Pz to the plastic hinge on the side of the column side beam part 20 at the column-to-beam joint 15 between the column part 10 and the column side beam part 20. It functions as an extension of the panel zone P, which is an area surrounded by the range Px of . That is, by providing the panel zone extension part 50, the panel zone P is expanded to the pillar part 10 and It extends to the vicinity of the joint portion 40 along the in-plane direction of the column-to-beam frame composed of the beam portions 20 and 30 .

The panel zone expansion part 50 is made of a steel plate welded to the side surface of the steel pipe 11 forming the column part 10 and the lower surface of the lower flange 23 of the H-section steel 21 forming the column side beam part 20, respectively. .
Further, a diaphragm 18 different from the beam-joining diaphragm 16 is provided on the lower side of the column-to-beam joint portion 15 in the column portion 10 . Then, in addition to the side surface of the steel pipe 11 that constitutes the column portion 10 and the lower surface of the lower flange 23 of the H-shaped steel 21 that constitutes the column-side beam portion 20, the panel zone expansion portion 50 is provided on the upper surface of the diaphragm 18. Welded. As a result, the joining portion of the panel zone extension portion 50 to the steel pipe 11 forming the column portion 10 is reinforced by the diaphragm 18 . Then, the panel zone expansion part 50 is firmly integrated with the column part 10 and the column side beam part 20, and the expansion of the panel zone P is reliably performed.

The panel zone expansion part 50 includes a rectangular panel area 51 having two sides of the joint part of the column part 10 and the joint part of the column side beam part 20, and from the panel area 51 toward the center side of the beam parts 20 and 30 and a gusset region 52 extending inward. The gusset region 52 functions as a joint joint region to which a joint portion 60, which will be described later, is jointed.
That is, a rectangular panel region 51, two sides of which are joined to the column portion 10 and the column side beam portion 20, is secured separately from the gusset region 52 in which bolt holes for joining the cantilever portion 60 are formed. . As a result, the panel region 51 can avoid the occurrence of cross-sectional defects due to the formation of bolt holes and the like, and the effect of expanding the panel zone P by the panel region 51 can be exhibited more reliably.

In this column-to-beam joint structure 100, the panel zone extension part 50 extending at least to the vicinity of the joint part 40 along the column side beam part 20 and the central side beam part 30 connected to the joint part 40 are connected to the joint part. A brace part 60 is provided so as to straddle the bridge 40 . This bracket portion 60 is attached to the gusset region 52 of the panel zone extension portion 50 and the gusset plate 38 welded to the lower surface of the lower flange 33 of the H-section steel 31 that constitutes the central side beam portion 30. It is composed of a pair of channel steels 61 fastened by bolts 63 and 64 in a sandwiched state. With this configuration, the panel zone P expanded by the panel zone expansion part 50 is even larger while adopting the brace part 60 that is shorter than the case where it is constructed across the column part 10 and the central side beam part 30. Evaluation can be made, and a sufficient seismic performance reinforcement effect can be obtained.

A small beam 70 is joined to the central side beam portion 30 in the vicinity of the joint portion of the square portion 60 , that is, the gusset plate 38 . With this configuration, the small beam 70 reinforces the vicinity of the joint portion of the central side beam portion 30 to which the axial force is transmitted from the cane portion 60 .

[Another embodiment]
Another embodiment of the present invention will be described. It should be noted that the configuration of each embodiment described below is not limited to being applied alone, and can be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the diaphragm 18 is provided on the lower side of the column-to-beam joint 15 with the column side beam 20 in the column 10, and the panel zone extension 50 is joined to the diaphragm 18. However, such a diaphragm The form in which 18 is provided may be appropriately modified or omitted.

(2) In the above-described embodiment, the small beam 70 is joined to the joint portion of the square beam portion 60 in the central side beam portion 30, but the joint portion of the small beam 70 may be changed as appropriate. The small beam 70 may be omitted as appropriate.

(3) In the above-described embodiment, in the panel zone extension part 50, the rectangular panel area 51 whose two sides are joined to the column part 10 and the column-side beam part 20 is replaced by the square part to which the bracket part 60 is joined. Although the gusset area 52 that is the joint area is secured separately, the panel area 51 and the gusset area 52 may be partially or wholly overlapped.

10 Column portion 18 Diaphragm 20 Column side beam portion 30 Center side beam portion 40 Joint portion 50 Panel zone extension portion 51 Panel region 52 Gusset region (branch joint region)
60 Bracket part 70 Small beam 100 Column-beam joint structure P Panel zone

Claims (4)

A column-to-beam joint structure comprising a column, a column-side beam projecting laterally from the column, and a center-side beam connected to the column-side beam through a joint. hand,
a panel zone extension part that is joined to each of the column part and the column side beam part and extends the panel zone along the structural plane direction;
A column-to-beam joint structure, comprising: a brace portion constructed over the panel zone extension portion and the central side beam portion. A diaphragm is provided below a joint portion between the column portion and the column-side beam portion,
The beam-to-column joint structure according to claim 1, wherein the panel zone extension is joined to each of the column, the column-side beam, and the diaphragm. The column-to-beam joint structure according to claim 1 or 2, wherein a small beam is joined to the joint portion of the cane portion in the central side beam portion. The panel zone extension part has a rectangular panel area having two sides of the joint part of the column part and the joint part of the column-side beam part, and a bracket extending from the panel area toward the center side of the beam. a junction region;
The beam-to-column joint structure according to any one of claims 1 to 3, wherein the brace portion is joined to the brace joint region.

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