Column-beam joint structure

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]

[0001] The present invention relates to a column-beam joint structure for joining a column and a beam. [Background technology]

[0002] A conventional column-beam joint structure is known in which a panel zone extension section is provided that is joined to each of the column and beam sections of a steel frame structure and expands the panel zone along the in-plane direction of the structure, thereby reinforcing earthquake resistance (see, for example, Patent Document 1).The panel zone refers to the area enclosed by the range up to the plastic hinge on the column side and the range up to the plastic hinge on the beam side in the column-beam joint. Another known column-beam joint structure is one in which a central side beam is connected to a column side beam that protrudes laterally from the column via a joint, and seismic resistance is reinforced by installing a diagonal brace section across the column and central side beam, straddling the joint (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-104995 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-088641 Summary of the Invention [Problem to be solved by the invention]

[0004] In the column-beam joint structure described in Patent Document 1, when a central side beam is connected to a column side beam that protrudes laterally from a column via a joint, it is necessary to remove the interfering portion of the panel zone extension that is in contact with the joint. This results in a problem that the joint length of the panel zone extension to the beam is shortened, reducing the expansion range of the panel zone and making it difficult to achieve sufficient reinforcement. Furthermore, when installing the panel zone extension so that it straddles the joint, construction becomes complicated. On the other hand, when installing a knee brace section spanning the column section and the central side beam section, as in the column-beam joint structure described in Patent Document 2, the knee brace section becomes relatively long, so the strength of the knee brace section needs to be significantly increased. In view of this situation, the main objective of the present invention is to provide a technology that can sufficiently reinforce earthquake resistance performance in a column-beam joint structure that includes a column portion, a column side beam portion that protrudes laterally from the column portion, and a central side beam portion that is connected to the column side beam portion via a joint portion, while adopting a rational structure and suppressing interference with the joint portion. [Means for solving the problem]

[0005] A first characteristic configuration of the present invention is a column-beam joint structure including a column portion, a column side beam portion protruding laterally from the column portion, and a central side beam portion connected to the column side beam portion via a joint portion, A panel zone expansion portion joined to each of the column portion and the column side beam portion to expand the panel zone along the in-plane direction; a knee brace portion extending across the panel zone extension portion and the central side beam portion; 、 A small beam is joined to the joint of the knee brace portion in the central side beam portion. It's at the point.

[0006] According to this configuration, the panel zone extension section is joined to the column-side beam section of the beam section from the side surface of the column section to the joint section, so that the panel zone extension section can be easily attached while avoiding interference between the panel zone extension section and the joint section. By attaching the panel zone extension section in this manner, the panel zone between the column section and the beam section can be extended along the beam section to the vicinity of the joint section. Furthermore, since the diagonal brace sections are installed across the panel zone extension section that extends along the beam section at least to the vicinity of the joint section and the central beam section connected to the joint section, the panel zone extended by the panel zone extension section can be evaluated to a greater extent, even when relatively short diagonal brace sections are used. Therefore, the present invention can provide a technology that can sufficiently reinforce seismic performance in a column-beam joint structure that includes a column portion, a column side beam portion that protrudes laterally from the column portion, and a central side beam portion that is connected to the column side beam portion via a joint portion, while adopting a rational structure and suppressing interference with the joint portion. Furthermore, with this configuration, the joint of the central side beam portion to which the axial force is transmitted from the knee brace portion can be reinforced by the small beam.

[0007] In a second characteristic configuration of the present invention, a diaphragm is provided on a lower side of a joint portion between the column portion and the column side beam portion, The panel zone extension portion is connected to each of the pillar portion, the pillar side beam portion, and the diaphragm.

[0008] According to this configuration, the panel zone extension section joined to each of the column section and the column side beam section is also joined to the diaphragm provided below the joint of the column section with the column side beam section. As a result, the joint of the panel zone extension section with the column section is reinforced by the diaphragm, and the panel zone extension section is firmly integrated with the column section and the column side beam section, ensuring reliable expansion of the panel zone.

[0011] The present invention 3 The panel zone extension portion has a rectangular panel area having two sides, the joint portion of the column portion and the joint portion of the column side beam portion, and a knee brace joint area extending from the panel area toward the center of the beam, The knee brace portion is joined to the knee brace joining region.

[0012] According to this configuration, in the panel zone expansion section, a rectangular panel area having a column joint and a column side beam joint on two sides is secured separately from the knee brace joint area where the knee brace section is joined. This prevents the occurrence of cross-sectional defects in the panel area due to the connection of the knee brace section, and ensures that the panel zone can be expanded using this panel area. [Brief explanation of the drawings]

[0013] [Figure 1]Elevation view of the column-beam joint structure of this embodiment [Figure 2] Cross section AA of Figure 1 DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, a column-beam connection structure 100 of this embodiment (hereinafter referred to as "this column-beam connection structure") is configured to join beam sections 20, 30 made of H-shaped steels 21, 31 to a column-beam connection section 15 in a column section 10 made of a steel pipe 11. The beam sections 20, 30 are provided with: a column-side beam section 20 made of an H-shaped steel 21 that protrudes laterally from the column section 10 and has its base end welded to a beam connection diaphragm 16 provided in the column section 10; a central beam section 30 made of an H-shaped steel 31 located closer to the center than the column-side beam section 20; and a joint section 40 that connects these sections in a butt-to-butt state. The joint section 40 is configured to connect the upper and lower flanges 22, 23 and web 25 of the column-side beam section 20 to the upper and lower flanges 32, 33 and web 35 of the central beam section 30 using splice plates 41, 42 fastened to them with high-strength bolts 45, 46. Furthermore, this column-beam joint structure 100 employs a configuration that sufficiently reinforces earthquake resistance while employing a rational structure and suppressing interference with the joint portion 40, and the details of this configuration are explained below.

[0015] This beam-column joint structure 100 is provided with panel zone extension portions 50 joined to each of the column portion 10 and the column-side beam portion 20 up to the joint portion 40. Such panel zone extension portions 50 function to extend the panel zone P, which is the area surrounded by the range Pz up to the plastic hinge on the column portion 10 side and the range Px up to the plastic hinge on the column-side beam portion 20 side, at the column-beam joint 15 between the column portion 10 and the column-side beam portion 20. In other words, by providing the panel zone extension portion 50, the panel zone P is expanded to the vicinity of the joint portion 40 along the in-plane direction of the column-beam frame composed of the column portion 10 and the beam portions 20, 30, based on the area surrounded by the range of the width of the column portion 10 and the range of the height of the beam portion 20.

[0016] The panel zone extension portion 50 is composed of steel plates welded to the side of the steel pipe 11 that constitutes the column portion 10 and to the underside of the lower flange 23 of the H-shaped steel 21 that constitutes the column side beam portion 20. Furthermore, a diaphragm 18 separate from the beam-joint diaphragm 16 is provided below the column-to-beam joint 15 in the column section 10. The panel zone expansion section 50 is welded to the upper surface of the diaphragm 18 in addition to the side surface of the steel pipe 11 constituting the column section 10 and the underside of the bottom flange 23 of the H-shaped steel 21 constituting the column side beam section 20. In this way, the joint of the panel zone expansion section 50 to the steel pipe 11 constituting the column section 10 is reinforced by the diaphragm 18. Then, the panel zone expansion section 50 is firmly integrated with the column section 10 and the column side beam section 20, ensuring the expansion of the panel zone P.

[0017] The panel zone extension 50 has a rectangular panel area 51 having two sides that are the joint of the column 10 and the joint of the column-side beam 20, and a gusset area 52 that extends from the panel area 51 toward the center of the beams 20 and 30. This gusset area 52 functions as a knee brace joint area to which a knee brace section 60, which will be described later, is joined. That is, the 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 and the like for joining the knee brace portions 60 are formed. This prevents the occurrence of cross-sectional defects in the panel region 51 due to the formation of bolt holes and the like, and the expansion effect of the panel region 51 on the panel zone P is more reliably achieved.

[0018] This beam-column connection structure 100 includes a panel zone extension section 50 that extends along the column-side beam section 20 at least to the vicinity of the joint section 40, and a knee brace section 60 that is installed across the central beam section 30 connected to the joint section 40, straddling the joint section 40. The knee brace section 60 is composed of a pair of channel steels 61 that are fastened with bolts 63, 64 to a gusset region 52 of the panel zone extension section 50 and a gusset plate 38 welded to the underside of the bottom flange 33 of the H-shaped steel 31 that constitutes the central beam section 30, sandwiching them. With this configuration, even though a shorter knee brace section 60 is used than when installed across the column section 10 and the central beam section 30, the panel zone P expanded by the panel zone extension section 50 can be evaluated to a greater extent, thereby achieving a sufficient seismic reinforcement effect.

[0019] A small beam 70 is joined to the central side beam 30 at the joint of the knee brace section 60, i.e., near the gusset plate 38. With this configuration, the area near the joint of the central side beam 30, where axial force is transmitted from the knee brace section 60, is reinforced by the small beam 70.

[0020] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0021] (1) In the above embodiment, a diaphragm 18 is provided below the column-beam joint 15 between the column portion 10 and the column side beam portion 20, and the panel zone expansion portion 50 is joined to the diaphragm 18, but the form in which such a diaphragm 18 is provided may be modified or omitted as appropriate.

[0022] (2) In the above embodiment, a small beam 70 was joined to the joint of the knee brace portion 60 in the central side beam portion 30, but the joint location of this small beam 70 may be changed as appropriate, and such a small beam 70 may also be omitted as appropriate.

[0023] (3) In the above embodiment, in the panel zone expansion portion 50, 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, which serves as the diagonal brace joint region to which the diagonal brace portion 60 is joined. However, the panel region 51 and part or all of the gusset region 52 may be overlapped. [Explanation of symbols]

[0024] 10 Pillar section 18 diaphragm 20 Column side beam 30 Center side beam 40 Joint 50 Panel Zone Extension 51 Panel Area 52 Gusset area (cane joint area) 60 cane section 70 Small beam 100 Column beam joint structure P Panel Zone

Claims

1. A column-beam joint structure including a column portion, a column side beam portion protruding laterally from the column portion, and a central side beam portion connected to the column side beam portion via a joint portion, A panel zone expansion portion joined to each of the column portion and the column side beam portion to expand the panel zone along the in-plane direction; a knee brace portion extending across the panel zone extension portion and the central side beam portion; A column-beam joint structure in which a small beam is joined to the joint of the knee brace section in the central side beam section.

2. a diaphragm is provided below a joint between the column and the column side beam portion, 2. The column-beam joint structure according to claim 1, wherein the panel zone extension portion is joined to each of the column portion, the column side beam portion, and the diaphragm.

3. The panel zone extension portion includes a rectangular panel area having a joint portion of the column portion and a joint portion of the column side beam portion on two sides, and a knee brace joint area extending from the panel area toward the center of the beam, and The beam-column joint structure according to claim 1 or 2, wherein the knee brace portion is joined to the knee brace joint region.

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