Column joint structure

Abstract

This provides a column joint structure that makes it difficult for bending moments to be transmitted to the column. [Solution] The column joint structure comprises a column-beam frame 10 comprising a column 20 whose base is supported by a structural body (foundation 12), and a beam 30 supported at the top of the column 20, and a plate 50 provided between the structural body and the base of the column, or between the top of the column and the beam 30, forming a gap around it.

Description

Technical Field

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[0001] The present invention relates to a joint structure of columns.

Background Art

[0002] The following Patent Document 1 describes a joint member for fixing a steel beam to a steel column. This joint member is provided for the purpose of accurately fixing the steel beam to the steel column and strengthening the integration of both, thereby enhancing the strength of the building itself.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the joint between the column and the beam is firmly formed as in Patent Document 1 above, when a horizontal force or bending force acts on the beam, a bending moment acts on the column. The column requires the shear strength to resist this bending moment. However, when it is desired to make the column thinner, it is not preferable for such a bending moment to act.

[0005] In consideration of the above facts, an object of the present invention is to provide a joint structure of columns in which it is difficult for a bending moment to be transmitted to the columns.

Means for Solving the Problems

[0006] The column joint structure according to claim 1 includes a column-beam framework including a column whose column base is supported by a structure and a beam supported by the column head of the column, and a plate provided between the structure and the column base or between the column head and the beam, and forming a gap around it.

[0007] In the column joint structure of claim 1, a gap is formed between the structure and the column base, or between the column head and the beam, by the plate.

[0008] By creating a gap around the plate in this way, when horizontal or bending forces act on the beam, the bending moment is less likely to be transmitted from the beam to the column head until the gap closes, and also less likely to be transmitted from the structure to the column base. In other words, the bending moment is less likely to be transmitted to the column.

[0009] Furthermore, since vertical loads are transmitted via plates between the column head and the beam, or between the structure and the column base, load-bearing capacity can be ensured.

[0010] The column joint structure of claim 2 is the column joint structure of claim 1, wherein the plate has chamfered edges.

[0011] In the column joint structure of claim 2, compared to a configuration without chamfering, the contact area between the plate and the column base, structure, column head, or beam is reduced, making it even more difficult for bending moments to be transmitted to the column.

[0012] The column joint structure of claim 3 is the column joint structure of claim 1 or 2, wherein a column head plate is joined to the column head, the plate is provided between the column head plate and the beam, and the column head plate and the beam are bolted together on both sides in a direction perpendicular to the axial direction of the beam with respect to the column, with the plate sandwiched between them.

[0013] In the column joint structure of claim 3, the column and bolts are arranged to overlap when viewed from a direction perpendicular to the axial direction of the beam, and no bolts are arranged on either side of the column in the axial direction of the beam. As a result, it is difficult for moments to be transmitted from the beam to the column via the bolts. [Effects of the Invention]

[0014] According to the present invention, bending moments are less likely to be transmitted to the column. [Brief explanation of the drawing]

[0015] [Figure 1] (A) is a side view showing a column joint structure according to an embodiment of the present invention, (B) is a view taken along the line BB in (A), and (C) is a view taken along the line CC in (A). [Figure 2] (A) is a partially enlarged view showing a plate in a column joint structure according to an embodiment of the present invention, (B) is a diagram showing a column joint structure according to a comparative example, and (C) is a diagram showing a column joint structure according to another comparative example. [Figure 3] (A) is a partially enlarged view showing a modified example of the plate in the column joint structure according to an embodiment of the present invention, (B) is a partially enlarged view showing yet another modified example, (C) is a partially enlarged view showing yet yet another modified example, and (D) is a partially enlarged view showing yet yet another modified example. [Figure 4] (A) is a side view showing a modified example of the plate arrangement in a column joint structure according to an embodiment of the present invention, and (B) is a view taken along the line BB in (A). [Figure 5] This is a side view showing an example of a column joint structure according to an embodiment of the present invention, in which a beam is inclined. [Modes for carrying out the invention]

[0016] The column joint structure according to an embodiment of the present invention will be described below with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same component. However, unless otherwise specified in the specification, each component is not limited to one, and there may be multiple such components.

[0017] Furthermore, explanations of redundant components and reference numerals in each drawing may be omitted. This disclosure is not limited to the following embodiments, and modifications can be made as appropriate within the scope of the purpose of this disclosure, such as omitting components, substituting them with different components, or combining one embodiment with various modifications.

[0018] In each drawing, the directions indicated by the arrows X and Y are along the horizontal plane and are perpendicular to each other. Also, the direction indicated by the arrow Z is along the vertical direction (up and down direction). In each figure, the directions indicated by the arrows X, Y, and Z shall be the same as each other.

[0019] <Column joint structure> In FIGS. 1(A) to (C), a column joint structure according to an embodiment of the present invention is shown. This column joint structure is a structure applied to a column-beam framework 10 that forms a plane (a plane along the X direction) shown in FIG. 1(A). The column-beam framework 10 is composed of a column 20, a beam 30, a joint member 40, and a plate 50. The column-beam frameworks 10 are arranged at a predetermined interval in the Y direction shown in FIG. 1(B), and each column-beam framework 10 is connected by a beam 32 described later.

[0020] (Column) The column 20 is a solid steel column. A column base plate 22 and a column head plate 24 are fixed to the column 20. The column base plate 22 is a steel plate welded to the lower end of the column 20. Similarly, the column head plate 24 is a steel plate welded to the upper end of the column 20.

[0021] The column base plate 22 is fixed to the foundation 12 as a structure by anchor bolts. Thereby, the column 20 (column foot part) is supported by the foundation 12. Note that the fixing structure of the lower end of the column 20 may be in a root-wrapping form or an embedding form in addition to the exposed form shown in this figure.

[0022] The column base plate 22 and the column head plate 24 are formed wider than the column 20 in the Y direction and protrude to both sides of the column 20. And the column base plate 22 is fixed to the foundation 12 by anchor bolts on both sides of the column 20 in the Y direction. On the other hand, the column head plate 24 is fixed to the joint member 40 on both sides of the column 20 in the Y direction as described later.

[0023] (Beam, joint member) The beam 30 is made of H-shaped steel and spans two columns 20. The ends of the beam 30 are fixed to joint members 40. The joint members 40 are also made of H-shaped steel. The joint members 40 are fixed to the columns 20 as will be described later. As a result, the beam 30 is supported at the tops of the columns 20.

[0024] The flange of beam 30 and the flange of joint member 40 are positioned on the same plane, and the web of beam 30 and the web of joint member 40 are also positioned on the same plane. The flange of beam 30 and the flange of joint member 40 are welded to each other, and the web of beam 30 and the web of joint member 40 are welded to each other.

[0025] As shown in Figure 1(B), the beam 32 is fixed to the joint member 40. The beam 32 is positioned so that its axial direction (Y direction) is perpendicular to the axial direction (X direction) of the beam 30.

[0026] The connecting steel plate 42 is welded to the web of the joint member 40 at the same height as the lower flange of the beam 32. The upper flange of the beam 32 is welded to the upper flange of the joint member 40, and the lower flange of the beam 32 is welded to the connecting steel plate 42.

[0027] Furthermore, a steel gusset plate 44 is welded to the upper flange, web, and connecting steel plate 42 of the joint member 40. The web of the beam 32 is bolted to this gusset plate 44.

[0028] Furthermore, steel stiffening plates 46 are welded to the lower flange, web, and joining steel plate 42 of the joint member 40. As shown in Figure 1(A), the stiffening plates 46 are positioned directly above the plate 50. Specifically, two stiffening plates 46 are positioned directly above both ends of the plate 50 in the X direction.

[0029] (plate) The plate 50 is a steel plate positioned between the column head of the column 20 and the joint member 40. Specifically, the plate 50 is positioned between the column head plate 24, which is arranged parallel to each other, and the lower flange of the joint member 40, forming a gap around the plate 50 and between the column head plate 24 and the lower flange of the joint member 40.

[0030] Furthermore, the plate 50 is formed to be narrower than the width of the column 20 in the X direction and is positioned directly above the column 20.

[0031] On the other hand, as shown in Figure 1(B), the plate 50 is formed to be approximately the same width as the lower flange of the column head plate 24 and the joint member 40 in the Y direction. The lower flanges of the column head plate 24 and the joint member 40 are fixed to the column 20 on both sides in the Y direction by bolts B, with the plate 50 sandwiched between them.

[0032] In Figure 1(B), the lower flanges of the plate 50, the column head plate 24, and the joint member 40 are formed to the same width, but the embodiments of the present invention are not limited to this. The widths of the plate 50, the column head plate 24, and the joint member 40 are not particularly limited as long as they can be fixed to each other.

[0033] In other words, the plate 50 only needs to form a gap between the column head plate 24 and the lower flange of the joint member 40 in the X direction, and the presence or absence of this gap in the Y direction is irrelevant.

[0034] In this embodiment, the beam 30 is supported on the column head of the column 20 via a joint member 40, but the term "beam supported on the column head of a column" in this invention also includes such configurations.

[0035] Similarly, in this embodiment, a plate 50 is provided between the column head of the column 20 and the joint member 40, but the "plate provided between the column head and the beam" in this invention also includes such configurations. That is, the joint member 40 is considered to be part of the beam 30 in this invention.

[0036] Furthermore, in this invention, the joint member 40 may be omitted, and the connecting steel plate 42, gusset plate 44, and stiffening plate 46 may be welded to the end of the beam 30. In this case, the beam 30 is supported by the column head of the column 20 via the plate 50. Also, the plate 50 is positioned between the lower flange of the beam 30 and the column head plate 24.

[0037] <Mechanism and Effects> In the column joint structure according to the embodiment of the present invention, a gap is formed between the column head of the column 20 and the joint member 40 by the plate 50.

[0038] In this way, by forming a gap around the plate 50, when horizontal or bending forces act on the beam 30 and the joint member 40, the bending moment is less likely to be transmitted from the beam 30 to the column head until the gap closes.

[0039] For example, as shown in Figure 2(A), the moment M about point O on the central axis CL in the X direction of the lower flange of the joint member 40 acts on the column 20 via the plate 50. The plate 50 is narrower in the X direction than the column 20. Note that the bolts B are not shown in the figures of Figure 2 and Figure 3.

[0040] Therefore, compared to the comparative example shown in Figure 2(B), which does not have a plate 50, for example, the bending moment is less likely to be transmitted to the column 20. In the comparative example, the bending moment acts from the joint member 40 to almost the entire surface of the column head plate 24.

[0041] Furthermore, the vertical load acting on the beam 30 and the joint member 40 is transmitted between the column head of the column 20 and the joint member 40 via the plate 50, thus ensuring load-bearing capacity.

[0042] Furthermore, in the above embodiment, the column 20 is a solid steel column (a column with steel beams filling its entire cross-section, rather than being hollow). Therefore, if the plate 50 is located at any point directly above the column 20, it can transmit vertical forces. In other words, the positional relationship between the column 20 and the plate 50 in the X direction may be misaligned.

[0043] Furthermore, in this column joint structure, the plate 50 makes it difficult to transmit bending moments between the beam 30 and the column 20, resulting in a pin joint or semi-rigid joint configuration.

[0044] This allows for a reduction in the height of the joint compared to a pin joint type using vertical plates arranged along the vertical direction, such as the comparative example shown in Figure 2(C). In this comparative example, it is necessary to use vertical plates and a pin joint core that have sufficient load-bearing capacity to resist vertical loads. Furthermore, since vertical plates tend to tilt in the Y direction, the load-bearing capacity in the Y direction is also weaker in the comparative example than in the present invention.

[0045] Furthermore, by reducing the height of the joint, the height of the column-beam frame 10 can be reduced. Alternatively, the space below the beam 30 can be increased. By increasing the space below the beam 30, the joint can be concealed by installing a tall finishing material, such as louvers, on the ceiling surface.

[0046] Furthermore, in this column joint structure, as shown in Figure 1(B), the column head plate 24 and the joint member 40 are joined by bolts B on both sides of the column 20 in the direction perpendicular to the axial direction of the beam 30 (Y direction), with the plate 50 in between.

[0047] As a result, as shown in Figure 1(A), when viewed from a direction perpendicular to the axial direction of the beam 30, the column 20 and the bolts B that fix the column head plate 24 and joint member 40 are positioned in overlapping positions, and no bolts B are positioned on either side of the beam 30 in the axial direction relative to the column 20. Therefore, it is difficult for moments to be input to the column 20 via the bolts B.

[0048] <Variation> In the above embodiment, the entire upper surface of the plate 50 is in contact with the joint member 40, and the entire lower surface of the plate 50 is in contact with the column head plate 24, but the embodiments of the present invention are not limited thereto.

[0049] For example, chamfers may be formed on plate 50. As shown in Figure 3(A), chamfers can be formed on both ends and the upper end of plate 50 in the X direction. Also, as shown in Figure 3(B), chamfers can be formed on both ends and the lower end of plate 50 in the X direction. Also, as shown in Figure 3(C), chamfers can be formed on both ends and the upper and lower ends of plate 50 in the X direction.

[0050] Furthermore, in each of the embodiments shown in Figures 3(A) to (C), the chamfer may be formed only on one end of the plate 50 in the X direction. Also, although the chamfer is shown as an arc shape in side view in each of the embodiments shown in Figures 3(A) to (C), it may also be a straight chamfer.

[0051] By forming such a chamfer, at least one of the contact area between the plate 50 and the column head plate 24, and the contact area between the plate 50 and the joint member 40 is reduced, making it even more difficult for bending moments to be transmitted to the column 20.

[0052] Furthermore, in the above embodiment, as shown in Figure 1(B), the lower flanges of the column head plate 24 and the joint member 40 are fixed by bolts B with the plate 50 in between, but the embodiments of the present invention are not limited to this.

[0053] For example, by using a plate 52 as shown in Figure 3(D), the column head plate 24 and the joint member 40 can be fixed without using bolts B. The plate 52 forms a gap between the column head plate 24 and the joint member 40, and the gap width H1 is set to allow the insertion of a welding tool. In this case, the column head plate 24 and the plate 52 are welded together, and the joint member 40 and the plate 52 are welded together.

[0054] In this embodiment, the width of the plate 52 in the Y direction, and the width of the column head plate 24 and the joint member 40 in the Y direction, are not particularly limited, as bolt fixing does not need to be considered. Also, since bolt fixing does not need to be considered, the column head plate 24 can be omitted, for example.

[0055] Furthermore, the columns 20 may not be made of solid steel, but rather, for example, square steel pipes or annular steel pipes. In this case, the column head plates 24 shall not be omitted. In addition, the columns 20 may be made of wood or reinforced concrete. Similarly, the beams 30 may be made of wood or reinforced concrete.

[0056] Furthermore, in the above embodiment, the plate 50 is placed between the column head plate 24 and the joint member 40, but the embodiments of the present invention are not limited to this. For example, as shown in Figures 4(A) and (B), the plate 50 may be placed between the column base plate 22 and the foundation 12.

[0057] The fixing structure at the lower end of the column 20 is preferably of an exposed type (i.e., other than a root-wrapping type or an embedded type), and it is also preferable that no mortar is interposed between the column base plate 22 and the foundation 12.

[0058] Furthermore, although the beam 30 is installed along the horizontal direction in the above embodiment, the embodiments of the present invention are not limited to this. For example, as shown in Figure 5, the beam 30 and the joint member 40 may be inclined in the X direction. In this case, the column head plate 24 can be inclined along the inclination of the beam 30.

[0059] Furthermore, in the above embodiment, the structure to which the lower end of the column 20 is joined is the foundation 12, but the embodiments of the present invention are not limited to this. For example, the structure may be a building or an equipment frame.

[0060] In these various embodiments, the present invention can achieve the effect of reducing the transmission of bending moment to the column 20, compared to the comparative example shown in Figure 2(B), for example. Thus, the present invention can be implemented in a variety of ways. [Explanation of Symbols]

[0061] 10 Column beam frame 12 Foundation (Structure) 20 pillars 24 Capital Plate 30 Beam 40 Joint members (beams) 50 plates 52 plates B bolt

Claims

1. A column-beam frame comprising a column whose base is supported by a structure, and a beam supported at the top of the column, A plate provided between the structure and the column base, or between the column head and the beam, forming a gap around it, A column joint structure equipped with [a specific feature].

2. The aforementioned plate has chamfered edges. The column joint structure according to claim 1.

3. A column head plate is attached to the column head. The aforementioned plate is provided between the column head plate and the beam, On both sides of the column in a direction perpendicular to the axial direction of the beam, the column head plate and the beam are bolted together with the plate in between. The column joint structure according to claim 1 or 2.

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