Column-beam joint structure

Abstract

To provide a column-beam joint structure capable of eliminating the need for labor such as placing diaphragms in a column-beam joint and welding beams to the diaphragms when joining beams having different plate thicknesses or ends of beams made of different materials and extending in the same direction.SOLUTION: A column-beam joint 13 of a building is a point where a column 11 intersects with a point where steel beams 12 intersect with each other. The column-beam joint 13 is surrounded by a blocking plate 15 placed at a portion where it is sandwiched between the intersecting beams 12. Inside a portion surrounded by the blocking plate 15 at the column-beam joint 13, a welding part 17 is present, in which ends of the beams 12 extending in the same direction and having different plate thicknesses are welded together. The welding part 17 is filled with concrete poured inside a portion surrounded by the blocking plate 15 at the column-beam joint 13.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] When a building is constructed using the RC column and S beam construction method (RCS construction method), etc., a column-beam joint is provided in the building where the steel beams intersect with the columns. In the column-beam joint, the ends of beams extending in the same direction may be joined together. In this case, if the plate thicknesses of the beams are different or the materials are different, it becomes difficult to properly join the ends of the beams by directly welding them together. In more detail, when a bending force is applied to the beam with the ends joined together, the bending stress acting on the welded part where the ends are welded together becomes large, and the welding between the ends of the beams at the welded part is adversely affected by the large bending stress. This makes it difficult to properly join the ends of the beams at the welded part.

[0003] In order to deal with this, as shown in Patent Document 1, the ends of beams are joined together via a diaphragm. More specifically, a diaphragm is disposed between the ends of beams. Then, the ends of the beams to be joined are welded to the diaphragm, respectively, so that the ends of the beams are joined together via the diaphragm. In this case, the ends of beams extending in the same direction are not directly welded together. Therefore, since there is no weld where the ends of beams with different plate thicknesses or material types are directly welded together, the above-mentioned problems related to the weld do not occur. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-172268 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, as shown in Patent Document 1, when the ends of beams extending in the same direction are joined via a diaphragm, it is time-consuming to place the diaphragm at the column-beam joint and to weld each of the beams to be joined to the diaphragm. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below. The beam-column joint structure that solves the above problem is applied to a beam-column joint where a column also intersects with the beams of a steel frame structure. The beam-column joint is surrounded by a closing plate arranged in the portion sandwiched between the intersecting beams. Inside the portion of the beam-column joint surrounded by the closing plate, there is a welded portion where the ends of beams that extend in the same direction but have different plate thicknesses are welded together. The welded portion is filled with concrete poured inside the portion of the beam-column joint surrounded by the closing plate.

[0007] According to the above configuration, if a building is constructed using the RC column / S beam construction method (RCS construction method), concrete is poured inside the portion surrounded by the blocking plate at the column beam joint. As a result, inside the portion surrounded by the blocking plate at the column beam joint, the welded portion where the ends of the beams that extend in the same direction and have different plate thicknesses are welded together is filled with the above concrete. This makes it possible to reduce the bending stress acting on the welded portion when a bending force is applied to the beam. When the plate thicknesses of the beams welded at the welded portion are different, the large bending stress acting on the welded portion adversely affects the welding of the ends of the beams. However, by reducing the bending stress acting on the welded portion as described above, it is possible to prevent the bending stress from adversely affecting the welding of the ends of the beams. Therefore, even if a diaphragm is not used to join the ends of beams that extend in the same direction and have different plate thicknesses, the joining can be performed appropriately, and therefore it is possible to save the trouble of arranging a diaphragm at the column beam joint and welding the beam to the diaphragm.

[0008] The beam-column joint structure that solves the above problem is applied to a beam-column joint where a column also intersects with the beams of a steel frame structure. The beam-column joint is surrounded by a closing plate arranged in the portion sandwiched between the intersecting beams. Inside the portion of the beam-column joint surrounded by the closing plate, there is a welded portion where the ends of beams that extend in the same direction but have different plate thicknesses are welded together. The welded portion is filled with concrete poured inside the portion of the beam-column joint surrounded by the closing plate.

[0009] According to the above configuration, if a building is constructed using the RC column / S beam construction method (RCS construction method), concrete is poured inside the portion surrounded by the blocking plate at the column-beam joint. As a result, inside the portion surrounded by the blocking plate at the column-beam joint, the welded portion where the ends of beams that extend in the same direction and are made of different materials are welded together is filled with the above concrete. This makes it possible to reduce the bending stress acting on the welded portion when a bending force is applied to the beam. When the beams welded at the welded portion are made of different materials, the large bending stress acting on the welded portion adversely affects the welding between the ends of the beams. However, by reducing the bending stress acting on the welded portion as described above, it is possible to prevent the bending stress from adversely affecting the welding between the ends of the beams. Therefore, even if a diaphragm is not used to join the ends of beams that extend in the same direction and are made of different materials, the joining can be performed appropriately, and therefore it is possible to save the trouble of arranging a diaphragm at the column-beam joint and welding the beam to the diaphragm.

[0010] The column-beam joint structure that solves the above problem is applied to a column-beam joint where a column also intersects with the beams of a steel frame structure. The column-beam joint is surrounded by a closing plate arranged in the part sandwiched between the intersecting beams. Inside the part of the column-beam joint surrounded by the closing plate, there is a weld where the ends of beams that extend in the same direction and have different plate thicknesses and material types are welded together. The weld is filled with concrete poured inside the part of the column-beam joint surrounded by the closing plate.

[0011] According to the above configuration, if a building is constructed using the RC column / S beam construction method (RCS construction method), concrete is poured inside the portion surrounded by the blocking plate at the column beam joint. As a result, inside the portion surrounded by the blocking plate at the column beam joint, the welded portion where the ends of beams that extend in the same direction and have different plate thicknesses and materials are welded together is filled with the above concrete. This makes it possible to reduce the bending stress acting on the welded portion when a bending force is applied to the beam. When the plate thicknesses and materials of the beams welded at the welded portion are different, the large bending stress acting on the welded portion adversely affects the welding between the ends of the beams. However, by reducing the bending stress acting on the welded portion as described above, it is possible to prevent the bending stress from adversely affecting the welding between the ends of the beams. Therefore, even if a diaphragm is not used to join beams with different plate thicknesses and materials, the joining can be performed appropriately, and therefore it is possible to save the trouble of arranging a diaphragm at the column beam joint and welding the beam to the diaphragm. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view showing a column-beam joint in a building. [Diagram 2] FIG. 2 is a plan view showing the column-beam joint of FIG. [Diagram 3] 3(a) is a graph showing the bending stress acting at each position in the longitudinal direction of a beam, and FIG. 3(b) is a cross-sectional view showing the state of the beam-column joint through which the beam passes, as viewed from the direction of arrows III-III in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, one embodiment of a beam-column joint structure will be described with reference to Figs. As shown in Figure 1, a building constructed using the RC column and S beam construction method (RCS construction method) has reinforced concrete columns 11 and steel beams 12. The steel frame that forms the beam 12 has plate-shaped webs 12a that stand upright in the vertical direction, and flanges 12b that protrude horizontally from both the top and bottom ends of the webs 12a. The flanges 12b extend in the longitudinal direction of the steel frame.

[0014] Such a building has a column-beam joint 13. At the column-beam joint 13, a column 11 also intersects at the point where the beams 12 intersect. Between the intersecting beams 12 at the column-beam joint 13, closing plates 15 bent into an L shape are arranged at positions corresponding to the outer surfaces of the columns 11. The closing plates 15 are welded to the webs 12a and flanges 12b of the beams 12. The column-beam joint 13 is surrounded by the closing plates 15 arranged in the portion sandwiched between the intersecting beams 12.

[0015] The beams 12 are joined together inside the portion surrounded by the closing plate 15 in the beam-column joint 13. In detail, the beams 12 are welded together while extending in the same direction, or while extending in directions perpendicular to each other. The welding of the beams 12 together is performed by welding the webs 12a of the beams 12 together and welding the flanges 12b together.

[0016] Among the beams 12 welded in this manner, the plate thicknesses of the beams 12 that extend in the same direction and have their ends welded to each other are different. That is, the plate thicknesses of the welded webs 12a are different from each other, and the plate thicknesses of the welded flanges 12b are different from each other. As shown in FIG. 2, inside the portion surrounded by the closing plate 15 in the beam-column joint 13, there are welded parts 17 where the beams 12 are welded to each other. Among these welded parts 17, there are welded parts where the ends of the beams 12 that extend in the same direction and have different plate thicknesses are welded to each other.

[0017] <Formation of column 11 and beam 12 in RC column / S beam construction> In the RC column / S beam construction method for buildings, after a reinforced concrete column 11 is formed, an intersection of beams 12 is placed at the top end of the column 11 as shown in Fig. 1. Furthermore, inside the portion surrounded by a closing plate 15 at the intersection of the beams 12 (column-beam joint 13), reinforcing bars 16 for forming a column 11 above the column-beam joint 13 are passed through, and concrete 18 is poured as shown in Fig. 2. This allows the steel frame that forms the beam 12 to pass through the poured concrete 18. After that, a column 11 above the column-beam joint 13 is formed above the column-beam joint 13.

[0018] In the RC-column / S-beam construction method for buildings, the columns 11 and beams 12 are formed in stages toward the upper section in this manner. In the column-beam joint 13 of a building built using the RC-column / S-beam construction method, the closing plate 15 provides shear resistance and also restrains the concrete 18 in the column-beam joint 13. Inside the portion surrounded by the closing plate 15 in the column-beam joint 13, the welded portion 17, where the ends of the beams 12 that extend in the same direction but have different plate thicknesses are welded together, is filled with the concrete 18.

[0019] Next, a bending stress acting on the beam 12 when a bending force is applied to the beam 12 passing through the portion surrounded by the closing plate 15 in the column-beam joint 13 will be described with reference to FIG.

[0020] The horizontal axis of Fig. 3(a) indicates each position in the longitudinal direction of the beam 12 passing through the portion surrounded by the closing plate 15 in the beam-column joint 13. The horizontal axis of Fig. 3(a) includes positions corresponding to the welded portion 17 at which the ends of the beams 12 extending in the same direction and having different plate thicknesses are welded together as shown in Fig. 3(b). The vertical axis of Fig. 3(a) indicates the bending stress acting on the position indicated by the horizontal axis in the longitudinal direction of the beam 12, i.e., the bending stress when a force in the bending direction is applied to the beam 12.

[0021] This bending stress is greatest at position X1 on the beam 12, which corresponds to the closing plate 15, and decreases toward position X2, which corresponds to the center of the beam-column joint 13. This is because concrete 18 is poured inside the portion surrounded by the closing plate 15 in the beam-column joint 13. Therefore, if the position of the welded portion 17 in Fig. 3(b) is position X in Fig. 3(a), which is inside the portion surrounded by the closing plate 15 in the beam-column joint 13, the bending stress A at position X is smaller than the bending stress at position X1.

[0022] Next, the effects of the column-beam joint structure of this embodiment will be described. Inside the portion surrounded by the closing plate 15 in the column-beam joint 13, there is a welded portion 17 where the ends of the beams 12 that extend in the same direction and have different plate thicknesses are welded together. This welded portion 17 is filled with concrete 18 poured inside the portion surrounded by the closing plate 15 in the column-beam joint 13. This makes it possible to reduce the bending stress A acting on the welded portion 17 when a bending force is applied to the beam 12. When the plate thicknesses of the beams 12 welded at the welded portion 17 are different, a large bending stress acts on the welded portion 17, adversely affecting the welding between the ends of the beams 12. However, by reducing the bending stress acting on the welded portion 17 as described above, it is possible to prevent the bending stress from adversely affecting the welding between the ends of the beams 12. Therefore, the joining of the ends of beams 12 with different plate thicknesses can be performed properly without using a diaphragm, thereby eliminating the need to place a diaphragm at the column-beam joint 13 and weld the beam 12 to the diaphragm.

[0023] The above embodiment can be modified, for example, as follows. The welded portion 17 may be formed by welding together beams 12 that extend in the same direction and are made of different materials, instead of welding together ends of beams 12 that extend in the same direction and have different plate thicknesses. The material type of the beams 12 referred to here refers to the standard or grade of the iron-based material in the steel frame that forms the beams 12. Beams 12 made of different materials have different yield points and different strengths.

[0024] When the beams 12 welded at the welded portion 17 are made of different materials, a large bending stress acts on the welded portion 17 due to the application of a bending force to the beams 12, adversely affecting the welding between the ends of the beams 12. However, since the welded portion 17 is filled with concrete 18 poured inside the portion surrounded by the closing plate 15 at the column-beam joint 13, the bending stress acting on the welded portion 17 is suppressed to be small. As a result, the bending stress acting on the welded portion 17 can be suppressed from adversely affecting the welding between the ends of the beams 12. Therefore, even if a diaphragm is not used to join the ends of the beams 12 that extend in the same direction and are made of different materials, the joining can be performed appropriately, and therefore the time and effort of arranging a diaphragm at the column-beam joint 13 and welding the beams 12 to the diaphragm can be saved.

[0025] The welded portion 17 may be formed by welding the ends of beams 12 that extend in the same direction and have different plate thicknesses and materials. When the beams 12 welded at the welded portion 17 have different plate thicknesses and materials, a large bending stress acts on the welded portion 17 due to the application of a bending force to the beam 12, adversely affecting the welding of the ends of the beams 12. However, since the welded portion 17 is filled with concrete 18 poured inside the portion surrounded by the closing plate 15 in the column-beam joint 13, the bending stress acting on the welded portion 17 is suppressed to be small. As a result, it is possible to suppress the bending stress acting on the welded portion 17 from adversely affecting the welding of the ends of the beams 12. Therefore, even if a diaphragm is not used to join the ends of beams 12 that extend in the same direction and have different plate thicknesses and materials, the joining can be performed appropriately, and therefore the time and effort of arranging a diaphragm in the column-beam joint 13 and welding the beam 12 to the diaphragm can be saved. [Explanation of symbols]

[0026] 11. Pillar 12...beam 12a…Web 12b...Flange 13…Column beam joint 15…Blocking plate 16…Reinforced concrete 17…Welded section 18…Concrete

Claims

1. In a column-beam joint structure applied to a column-beam joint where columns also intersect at the points where beams of a steel frame intersect, The column-beam joint is surrounded by a closing plate disposed in a portion sandwiched between the intersecting beams, Inside the portion surrounded by the closing plate in the column-beam joint, there is a welded portion in which the ends of the beams extending in the same direction and having different plate thicknesses are welded to each other, A column-beam joint structure in which the welded portion is filled with concrete poured inside the portion of the column-beam joint surrounded by the closing plate.

2. In a column-beam joint structure applied to a column-beam joint where columns also intersect at the points where beams of a steel frame intersect, The column-beam joint is surrounded by a closing plate disposed in a portion sandwiched between the intersecting beams, Inside the portion surrounded by the closing plate in the column-beam joint, there is a welded portion in which the ends of the beams extending in the same direction and made of different materials are welded together, A column-beam joint structure in which the welded portion is filled with concrete poured inside the portion of the column-beam joint surrounded by the closing plate.

3. In a column-beam joint structure applied to a column-beam joint where columns also intersect at the points where beams of a steel frame intersect, The column-beam joint is surrounded by a closing plate disposed in a portion sandwiched between the intersecting beams, Inside the portion surrounded by the closing plate in the column-beam joint, there is a welded portion in which the ends of the beams extending in the same direction and having different plate thicknesses and material types are welded together, A column-beam joint structure in which the welded portion is filled with concrete poured inside the portion of the column-beam joint surrounded by the closing plate.

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