Column-beam joint construction

Abstract

To provide a column-beam joint structure which can improve shear rigidity.SOLUTION: A column-beam joint structure 1 is a column-beam joint structure of a joint part between an outer column 2 which is made of a concrete-filled steel pipe structure where inside of a steel pipe 21 is filled with concrete and is arranged along an outer periphery A of a building, and a beam 3 of H-shaped steel joined to an upper end of the outer column 2, and includes a reinforcement plate 4 provided on an end face 3a positioned on the outer periphery A side of the building in the beam 3, wherein the reinforcement plate 4 is joined to an end face 31a of an upper flange 31 of the beam 3, an end face 33a of a web 33 and an end face 32a of a lower flange 32.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a column-beam joint structure.

Background Art

[0002] Conventionally, an RCST (Reinforced Concrete Steel Tube) structure combining a column of CFT construction (Concrete Filled Steel Tube construction) and a beam of S construction (Steel Frame construction) has been known (see Patent Document 1 below). In the RCST structure, after arranging column main bars inside the column steel tubes without welding the upper and lower column steel tubes, concrete is placed to join the upper and lower floors. As a result, the column main bars are fixed to the concrete.

[0003] On the top floor, the column main bars are bent inside the column and fixed to the concrete, or the column main bars are mechanically fixed to the top of the column. Also, in the beam-through type joint, on the side where the beam does not join in the column-beam joint of the outer column, the beam may protrude about 50 mm from the column face (the outer surface of the column).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the column-beam joint of the outer column and on the top floor, the shear elastic rigidity of the column-beam joint is significantly smaller compared to other joint shapes. There is a problem that in the column-beam joint of the outer column and on the top floor, it may be about 0.2 times the design formula that gives the shear rigidity of the cross-shaped column-beam joint where the beam is orthogonal to the column.

[0006] Therefore, the present invention has been made in view of the above circumstances, and provides a column-beam joint structure capable of improving the shear rigidity. [Means for solving the problem]

[0007] To achieve the above objective, the present invention employs the following means. In other words, the column-beam joint structure according to the present invention is a concrete-filled steel pipe construction in which concrete is filled inside the steel pipe, and is a column-beam joint structure for the joint between an outer column arranged along the outer perimeter of a building and an H-shaped steel beam joined to the upper end of the outer column, wherein the beam is provided with a reinforcing plate on the end face located on the outer perimeter of the building, and the reinforcing plate is joined to the end face of the upper flange of the beam, the end face of the web, and the end face of the lower flange.

[0008] In this column-beam joint structure, a reinforcing plate is attached to the end face that is the free end of the beam. Therefore, the shear stiffness of the beam web is increased, and the shear stiffness of the joint can be improved.

[0009] Furthermore, in the column-beam joint structure according to the present invention, the reinforcing plate may be welded to the end face of the upper flange, the end face of the web, and the end face of the lower flange.

[0010] In this column-beam joint structure, the reinforcing plate is welded to the end face of the upper flange, the end face of the web, and the end face of the lower flange. Therefore, the reinforcing plate can be easily joined to the end face of the upper flange, the end face of the web, and the end face of the lower flange.

[0011] Furthermore, in the column-beam joint structure according to the present invention, the width of the reinforcing plate may be 1 / 2 or more of the width of the beam.

[0012] In this column-beam joint structure, the width of the reinforcing plate is at least half the width of the beam. Therefore, the rigidity of the reinforcing plate can be increased.

[0013] Furthermore, in the column-beam joint structure according to the present invention, the thickness of the reinforcing plate may be greater than or equal to the thickness of the web.

[0014] In this column-beam joint structure, the thickness of the reinforcing plate is greater than or equal to the thickness of the web. Therefore, the rigidity of the reinforcing plate can be increased. [Effects of the Invention]

[0015] According to the column-beam joint structure of the present invention, shear rigidity can be improved. [Brief explanation of the drawing]

[0016] [Figure 1] This is a top view showing a column-beam joint structure according to one embodiment of the present invention. [Figure 2] This is a vertical cross-sectional view showing a column-beam joint structure according to one embodiment of the present invention. [Modes for carrying out the invention]

[0017] A column-beam joint structure according to one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a top view showing a column-beam joint structure according to one embodiment of the present invention. Figure 2 is a vertical cross-sectional view showing a column-beam joint structure according to one embodiment of the present invention. In Figure 1, the outer column 2 is shown in a horizontal cross-section. As shown in Figure 1, the column-beam joint structure 1 of this embodiment is a structure of the joint 10 between the upper end (highest point) of the outer column 2, which is arranged along the outer perimeter A of the building, and the beam 3. The column-beam joint structure 1 is equipped with a reinforcing plate 4.

[0018] One direction along the horizontal is defined as the X direction. The other direction perpendicular to the horizontal direction is defined as the Y direction. At the joint 10, beams 3 are joined to the outer column 2 on both sides in the Y direction, and beam 3 is also joined to one side in the X direction (right side in Figure 1). The other side in the X direction (left side in Figure 1) is located on the outer perimeter A side of the building. The joint 10 is configured such that beam 3 penetrates the interior of the outer column 2.

[0019] The outer column 2 is a concrete-filled steel tube structure with concrete filled inside the steel tube 21. The outer column 2 has a steel tube 21, a plurality of main reinforcement bars 22, and a concrete part 23. The steel tube 21 is formed in a cylindrical shape with the vertical direction as the axial direction. As shown in FIG. 2, the steel tube 21 has a steel tube body 21b disposed below the beam 3 and a gusset plate 21c disposed at the same height as the beam 3.

[0020] As shown in FIG. 1, the main reinforcement bars 22 are arranged along the inner side of the steel tube 21. The main reinforcement bars 22 are arranged at intervals in the circumferential direction. The main reinforcement bars 22 extend in the vertical direction. The number of the main reinforcement bars 22 can be set as appropriate. The concrete part 23 is filled inside the steel tube 21. The main reinforcement bars 22 are fixed to the concrete part 23.

[0021] The beam 3 is composed of H-shaped steel. As shown in FIG. 2, the beam 3 has an upper flange 31, a lower flange 32, and a web 33.

[0022] The upper flange 31 and the lower flange 32 are arranged at a distance in the vertical direction. The upper flange 31 and the lower flange 32 are formed in a plate shape. The plate surfaces of the upper flange 31 and the lower flange 32 face in the vertical direction.

[0023] The web 33 connects the upper flange 31 and the lower flange 32. The web 33 is formed in a plate shape. The plate surface of the web 33 faces in the horizontal direction.

[0024] In this embodiment, for the beam 3 extending in the Y direction (referred to as "beam 3B"), beams 3 extending in the X direction (referred to as "beam 3A") are joined to both sides in the X direction. It should be noted that a configuration in which beam 3B is joined to both sides in the Y direction with respect to beam 3A may also be adopted.

[0025] At the joint 10, the slab 5 is installed above the beam 3. The upper ends of the main reinforcement bars 22 are anchored to the concrete of the slab 5 via mechanical connectors 25. Alternatively, the upper ends of the main reinforcement bars 22 may be bent and anchored to the concrete without using mechanical connectors 2, and the method of anchoring the upper ends of the main reinforcement bars 22 can be set as appropriate.

[0026] At the joint 10, the end face 3a of the beam 3A, located on the outer perimeter A side of the building and facing outer perimeter A, protrudes slightly toward outer perimeter A than the closing plate 21c of the outer column 2. The reinforcing plate 4 is joined to the end face 3a of the beam 3A. The reinforcing plate 4 is joined to the end face 31a of the upper flange 31, the end face 32a of the lower flange 32, and the end face 33a of the web 33 of the beam 3A by welding or the like. The reinforcing plate 4 may also be joined to the end face 31a of the upper flange 31, the end face 32a of the lower flange 32, and the end face 33a of the web 33 via a splice plate or the like.

[0027] The reinforcing plate 4 is made of steel plate. The reinforcing plate 4 is formed in a plate shape. The plate surface of the reinforcing plate 4 faces the X direction. The thickness B1 of the reinforcing plate 4 is greater than or equal to the thickness C1 of the web 33 of the beam 3. However, the thickness B1 of the reinforcing plate 4 may be less than the thickness C1 of the web 33 of the beam 3.

[0028] As shown in Figure 1, the width B2 of the reinforcing plate 4 is at least half the width C2 of the beam 3. However, the width B2 of the reinforcing plate 4 may be less than half the width C2 of the beam 3.

[0029] As shown in Figure 2, the vertical length B3 of the reinforcing plate 4 is slightly longer than the depth C3 of the beam 3. The upper end 4u of the reinforcing plate 4 is located higher than the upper flange 31. The lower end 4d of the reinforcing plate 4 is located lower than the lower flange 32.

[0030] In the column-beam joint structure 1 configured in this way, a reinforcing plate 4 is joined to the end face 3a, which is the free end side of the beam 3. Therefore, the shear stiffness of the web 33 of the beam 3 is increased, and the shear stiffness of the joint 10 can be improved. Consequently, it is possible to suppress increased structural deformation and stress concentration at a predetermined location.

[0031] Furthermore, the reinforcing plate 4 is welded to the end face 31a of the upper flange 31, the end face 32a of the lower flange 32, and the end face 33a of the web 33. Therefore, the reinforcing plate 4 can be easily joined to the end face 31a of the upper flange 31, the end face 32a of the lower flange 32, and the end face 33a of the web 33.

[0032] Furthermore, the width B2 of the reinforcing plate 4 is at least half the width C2 of the beam 3. Therefore, the rigidity of the reinforcing plate 4 can be increased.

[0033] Furthermore, the thickness B1 of the reinforcing plate 4 is greater than or equal to the thickness C1 of the web 33. Therefore, the rigidity of the reinforcing plate 4 can be increased.

[0034] It should be noted that the assembly procedure, or the various shapes and combinations of each component shown in the above-described embodiment, are merely examples and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0035] For example, in the embodiment shown above, the column-beam joint structure 1 has beams 3 joined to the outer column 2 on both sides in the Y direction, but the present invention is not limited to this. It is also applicable to joints where one side in the Y direction is located on the outer perimeter of the building, and beams 3 are joined to the outer column 2 only on one side in the Y direction. In this case, a reinforcing plate 4 can be joined to the other end face in the Y direction where beams 3 are not joined. [Explanation of Symbols]

[0036] 1 Column beam joint structure 2 Outer pillar 3,3A,3B beam 3a End face of the beam 4. Reinforcement plate 10 Joint 21 Steel pipe 31 Upper flange 31a End face of the upper flange 32 Lower flange 32a End face of the lower flange 33 Web 33a Web edge A Outer perimeter B1 Reinforcement plate thickness B2 Reinforcement plate width C1 Web Thickness C2 beam width

Claims

1. A concrete-filled steel pipe structure in which concrete is filled inside the steel pipe, a column-beam joint structure at the joint between the outer columns arranged along the outer perimeter of the building and the H-shaped steel beams joined to the upper ends of the outer columns, The beam is provided with a reinforcing plate on the end face located on the outer perimeter side of the building, The reinforcing plate is joined to the end face of the upper flange of the beam, the end face of the web, and the end face of the lower flange. The steel pipe comprises a steel pipe body positioned below the beam and a cover plate positioned at the same height as the beam. The reinforcing plate is located on the outer periphery side of the blocking plate and is joined to the end face of the beam located on the outer periphery side of the building in the beam, forming a column-beam joint structure.

2. The column-beam joint structure according to claim 1, wherein the reinforcing plate is welded to the end face of the upper flange, the end face of the web, and the end face of the lower flange.

3. The column-beam joint structure according to claim 1 or 2, wherein the width of the reinforcing plate is 1 / 2 or more of the width of the beam.

4. The column-beam joint structure according to claim 1 or 2, wherein the thickness of the reinforcing plate is equal to or greater than the thickness of the web.

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