Column-beam joint structure and method for manufacturing the column-beam joint structure

Abstract

To further improve workability and effectively resist slip-out of a beam in a beam-to-column connection structure specialized for vertical load.SOLUTION: A beam-to-column connection structure includes a concrete column, at least one pair of H-shaped steel beams whose ends are butted against each other inside the concrete column and are connected to each other only at upper flanges, and at least one pair of bearing plates connected to the respective at least one pair of H-shaped steel beams and located inside the concrete column or in contact with the side surface of the concrete column.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] In recent years, architectural structures are often designed to bear earthquake loads using seismic isolation mechanisms such as seismic isolation devices and seismic braces installed in addition to structural members. In such architectural structures, structural members do not need to bear earthquake loads, so there is no need to design joint structures assuming that structural members will bear earthquake loads as in the past. In this case, a design specialized for supporting vertical loads can omit bolt joints and metal fittings for rigid joints, improving workability. However, there are still few proposals for such joint structure designs, and only technologies such as those in Patent Document 1 and Patent Document 2 have been proposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-196637 A [Patent Document 2] International Publication No. WO2017 / 170732 Summary of the Invention [Problem to be solved by the invention]

[0004] Although the technologies described above can improve workability, there is still room for improvement in areas such as further improving workability by reducing the number of parts, and resistance to beam slippage in areas with high loads.

[0005] Therefore, an object of the present invention is to provide a column-beam joint structure and a manufacturing method thereof that further improves workability in a column-beam joint structure specialized for vertical loads and can effectively resist beam slippage. [Means for solving the problem]

[0006] [1] A column-beam joint structure comprising: a concrete column; at least one pair of H-shaped steel beams whose ends are butted together inside the concrete column and joined to each other only by their upper flanges; and at least one pair of support plates joined to each of the at least one pair of H-shaped steel beams and located inside the concrete column or in contact with the sides of the concrete column. [2] A column-beam joint structure as described in [1], wherein the at least one pair of support plates are joined to the upper flanges, webs and lower flanges of the at least one pair of H-shaped steel beams. [3] A column-beam connection structure described in [1] or [2], in which at least one pair of H-shaped steel beams are bolted to each other at their upper flanges via splice plates. [4] The at least one pair of H-shaped steel beams includes first and second H-shaped steel beams and third and fourth H-shaped steel beams, the first and second H-shaped steel beams having ends directly butted together, the third and fourth H-shaped steel beams extending in a direction intersecting the first and second H-shaped steel beams and having ends indirectly butted together via the first and second H-shaped steel beams, the upper flanges of the first and second H-shaped steel beams being joined to each other, and the upper flanges of the third and fourth H-shaped steel beams being joined to each other. A column-beam connection structure as described in any one of [1] to [3]. [5] A column-beam joint structure described in any one of [1] to [3], further comprising an additional H-shaped steel beam whose ends are butted against the butt portions of the pair of H-shaped steel beams and whose upper flange alone is joined to the upper flanges of the pair of H-shaped steel beams, and an additional support plate joined to the additional H-shaped steel beam and located inside the concrete column or in contact with the side of the concrete column. [6] A manufacturing method for a column-beam joint structure, comprising: a step of butting the ends of at least one pair of H-shaped steel beams above an upper surface of the poured concrete of a concrete column and joining the at least one pair of H-shaped steel beams to each other only with the upper flanges; and a step of embedding the butt portions of the at least one pair of H-shaped steel beams in the concrete column by pouring the concrete column above the upper surface of the poured concrete, and embedding at least one pair of support plates joined to each of the at least one pair of H-shaped steel beams in the concrete column or contacting the at least one pair of support plates with the sides of the concrete column. Effect of the Invention

[0007] According to the above-mentioned structure, by arranging a bearing plate that receives the bearing pressure from the concrete column, a pair of H-shaped steel beams can stably resist vertical loads with a simple structure in which only the upper flanges are joined. Since the tensile force due to bending moment acts most strongly on the upper flanges, joining the upper flanges is more effective at resisting beam slippage than joining the webs, for example. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a beam-column joint structure according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram showing the state during construction of the column-beam joint structure shown in FIG. [Diagram 3] 2 is a diagram showing an external force acting on the column-beam joint structure shown in FIG. 1. [Figure 4] FIG. 4 is a diagram showing a force resisting the external force shown in FIG. 3. [Diagram 5] FIG. 6 is a perspective view of a beam-column joint structure according to a second embodiment of the present invention. [Figure 6] FIG. 11 is a perspective view of a beam-column joint structure according to a third embodiment of the present invention. [Figure 7] 7 is a diagram showing an external force acting on the beam joint structure shown in FIG. 6. [Figure 8] FIG. 8 is a diagram showing a force resisting the external force shown in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and duplicated explanations will be omitted.

[0010] (First embodiment) FIG. 1 is a perspective view of a column-beam joint structure according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a state during construction of the column-beam joint structure shown in FIG. 1. In the illustrated example, the column-beam joint structure 1 includes a reinforced concrete column 2 and H-shaped steel beams 3, 4. The H-shaped steel beams 3, 4 have upper flanges 31, 41, webs 32, 42, and lower flanges 33, 43, respectively. The ends of the H-shaped steel beams 3, 4 are butted together inside the reinforced concrete column 2. That is, the material axis directions of the H-shaped steel beams 3, 4 are the same, and the end faces in the material axis direction face each other. However, the end faces in the material axis direction of the H-shaped steel beams 3, 4 do not necessarily have to be in contact with each other. In this specification, the "end" and "end face" of the H-shaped steel beam mean the end and end face in the material axis direction of each H-shaped steel beam, unless otherwise specified. The part where the ends of the H-shaped steel beams 3, 4 are butted together is located inside the reinforced concrete column 2. Moreover, the H-shaped steel beams 3, 4 are joined to each other only by the upper flanges 31, 41. Specifically, the upper flanges 31, 41 are joined to the splice plate 5A arranged on the upper surface of each of them and the splice plate 5B arranged on the lower surface of each of them using bolts 51, 52. The splice plate 5B on the lower surface side may be omitted, and the upper flanges 31, 41 may be joined to each other only through the splice plate 5A arranged on the upper surface of each of them. The webs 32, 42 and the lower flanges 33, 43 of the H-shaped steel beams 3, 4 are not joined to each other. Furthermore, the support plates 34, 44 are joined to each of the H-shaped steel beams 3, 4. Specifically, the support plate 34 is welded to the upper flange 31, the web 32, and the lower flange 33 of the H-shaped steel beam 3, and the support plate 44 is welded to the upper flange 41, the web 42, and the lower flange 43 of the H-shaped steel beam 4. The bearing plates 34 , 44 are joined to positions near the ends of the H-shaped steel beams 3 , 4 and are located inside the reinforced concrete column 2 .

[0011] As shown in FIG. 2, the above-mentioned beam-column joint structure 1 is constructed by butting the ends of the H-shaped steel beams 3, 4 above the concrete pouring top surface 21, joining the upper flanges 31, 41 using splice plates 5A, 5B and bolts 51, 52, and then pouring concrete above the concrete pouring top surface 21, as shown in FIG. 2. At this time, by placing the ends of the H-shaped steel beams 3, 4 on a jig 22 installed on the concrete pouring top surface 21, the positioning of the H-shaped steel beams 3, 4 and the joining of the upper flanges 31, 41 are facilitated. The jig 22 may be, for example, a block formed of mortar, or may be a metal fitting embedded in the concrete pouring top surface 21. The jig 22 is embedded inside the reinforced concrete column 2 together with the ends of the H-shaped steel beams 3, 4 when pouring concrete above the concrete pouring top surface 21. In addition, for example, in cases where the upper surface 21 of the concrete pouring is located close to the lower surfaces of the lower flanges 33, 43, the jig 22 does not necessarily have to be used.

[0012] FIG. 3 is a diagram showing an external force acting on the beam-column joint structure shown in FIG. 1, and FIG. 4 is a diagram showing a force resisting the external force shown in FIG. 3. The beam-column joint structure 1 is designed specifically to support a vertical load P acting on the H-shaped steel beams 3, 4 as shown in FIG. 3, since the earthquake load is borne by a seismic isolation mechanism provided separately or the structure is in an environment where it is not necessary to assume the earthquake load. Specifically, the vertical load P is, for example, the self-weight or live load of the structure. In this case, as shown in FIG. 4, the beam-column joint structure 1 resists a shear force Q and a bending moment M. Specifically, concrete bearing pressures B1, B2 act vertically on the upper flanges 31, 41 and the lower flanges 33, 43, respectively. Since the bending moment M acts as a tensile force on the upper flanges 31, 41 and as a compressive force on the lower flanges 33, 43, a force acts on the bearing plates 34, 44 to rotate the H-shaped steel beams 3, 4 around their neutral axes, and this force is resisted by the horizontal bearing pressure B3 of the concrete. The upper flanges 31, 41 can resist the tensile force by being joined to each other via the splice plates 5A, 5B. The upper flanges 31, 41 may be joined by welding, but by using the splice plates 5A, 5B and the bolts 51, 52, the bolts 51, 52 embedded in the concrete act as shear keys (slip-stops), and the tensile force can be resisted more effectively.

[0013] In the first embodiment of the present invention described above, by arranging the bearing plates 34, 44 that receive the bearing pressure from the reinforced concrete column 2, the H-shaped steel beams 3, 4 can stably resist the vertical load with a simple structure in which only the upper flanges 31, 41 are joined. Since the tensile force due to the bending moment M acts strongest on the upper flanges 31, 41, for example, joining the upper flanges 31, 41 rather than the webs 32, 42 can effectively resist the beam slipping out. For example, when the H-shaped steel beams 3, 4 have a relatively large cross section, both sides of the upper flanges 31, 41 are easier to reach than the webs 32, 42, and workability is high whether using the bolts 51, 52 or welding, for example.

[0014] In the above example, the bearing plates 34, 44 are described as being located inside the reinforced concrete column 2, but the bearing plates 34, 44 may be arranged so as to contact the side of the reinforced concrete column 2. Since the bearing pressure acting mainly on the bearing plates 34, 44 resists the compressive force acting on the H-shaped steel beams 3, 4 by the bending moment M, the outside of the bearing plates 34, 44 does not necessarily need to be covered with concrete. In the above case, for example, the bearing plates 34, 44 may be incorporated into a part of the formwork when pouring concrete. Also, the bearing plates 34, 44 do not necessarily need to be joined to all of the upper flanges 31, 41, the webs 32, 42, and the lower flanges 33, 43, and for example, they do not need to be joined to the webs 32, 42.

[0015] Second Embodiment FIG. 5 is a perspective view of a column-beam joint structure according to a second embodiment of the present invention. In the illustrated example, the column-beam joint structure 11 includes H-shaped steel beams 6, 7 in addition to the reinforced concrete column 2 and H-shaped steel beams 3, 4 similar to those in the first embodiment. In FIG. 5, a part of the reinforced concrete column 2 is seen through for the purpose of explanation. The H-shaped steel beams 6, 7 have upper flanges 61, 71, webs 62, 72, and lower flanges 63, 73, respectively. The H-shaped steel beams 6, 7 extend in a direction intersecting with the H-shaped steel beams 3, 4, and the ends of the H-shaped steel beams 6, 7 are indirectly butted together through the H-shaped steel beams 3, 4 inside the reinforced concrete column 2. In other words, the material axis direction of the H-shaped steel beams 6, 7 coincides with the material axis direction of the H-shaped steel beams 3, 4 in a direction intersecting with the material axis direction of the H-shaped steel beams 3, 4, and the end faces of the material axis direction of the H-shaped steel beams 6, 7 face each other across the H-shaped steel beams 3, 4. The end faces of the H-shaped steel beams 6, 7 in the material axis direction do not necessarily have to be in contact with the H-shaped steel beams 3, 4. The part where the ends of the H-shaped steel beams 6, 7 are butted together is also located inside the reinforced concrete column 2. The H-shaped steel beams 6, 7 are joined to each other only by the upper flanges 61, 71. Specifically, the upper flanges 61, 71 are joined to the splice plates 8 arranged on the upper surfaces of the H-shaped steel beams 6, 7 by using bolts 81, 82. The webs 62, 72 and the lower flanges 63, 73 of the H-shaped steel beams 6, 7 are not joined to each other. Furthermore, like the bearing plates 34, 44 of the H-shaped steel beams 3, 4, bearing plates 64, 74 are joined to the H-shaped steel beams 6, 7, respectively, and the bearing plates 64, 74 are also located inside the reinforced concrete column 2.

[0016] In the construction of the beam-column joint structure 11 as described above, the ends of the H-shaped steel beams 3, 4 are butted together above the upper surface of the concrete being poured during the pouring of the reinforced concrete column 2, and the ends of the H-shaped steel beams 6, 7 are butted together with the H-shaped steel beams 3, 4 sandwiched between them. In the illustrated example, the upper flanges 61, 71 of the H-shaped steel beams 6, 7 are first joined using splice plates 8 and bolts 81, 82, and then the upper flanges 31, 41 of the H-shaped steel beams 3, 4 are joined using splice plates 5A, 5B and bolts 51, 52. In this case, the splice plate 8 is placed across the part where the ends of the H-shaped steel beams 3, 4 are butted together, and the splice plate 5A is placed across the splice plate 8. Since the splice plate 5A is raised from the upper flanges 31, 41 by the amount of the splice plate 8, spacers 53, 54 are inserted between the splice plate 5A and the upper flanges 31, 41.

[0017] As in the first embodiment, the splice plate 5B on the underside of the upper flanges 31, 41 may be omitted. For the H-shaped steel beams 6, 7, a splice plate may be arranged on the underside in addition to the splice plate 8 on the upper side. In this case, however, since the splice plate on the underside is arranged penetrating the webs 32, 42 of the H-shaped steel beams 3, 4, it is preferable to omit the splice plate on the underside from the viewpoint of facilitating the processing and construction of the H-shaped steel beams 3, 4.

[0018] Moreover, the construction of the beam-column joint structure 11 as described above may be performed in the reverse order. Specifically, first, the upper flanges 31, 41 of the H-shaped steel beams 3, 4 may be joined using the splice plates 5A, 5B and the bolts 51, 52, and then the upper flanges 61, 71 of the H-shaped steel beams 6, 7 may be joined using the splice plate 8 and the bolts 81, 82. In this case, the splice plate 8 is disposed across the splice plate 5A, and a spacer is inserted between the splice plate 8, which is raised from the upper flanges 61, 71 by the amount of the splice plate 5A, and the upper flanges 61, 71.

[0019] As another example, a cross-shaped splice plate in which the splice plate 5A and the splice plate 8 shown in FIG. 5 are integrated may be used. The cross-shaped splice plate is joined to all of the upper flanges 31, 41 and the upper flanges 61, 71 using bolts 51, 52 and bolts 81, 82. Alternatively, the upper flanges 31, 41 of the H-shaped steel beams 3, 4 may be joined by welding, and the upper flanges 61, 71 of the H-shaped steel beams 6, 7 may be joined using the splice plate 8 and bolts 81, 82. In these examples, it is not necessary to insert a spacer between the splice plate and the upper flange. Also, when constructing the column-beam joint structure 11 according to the second embodiment, a jig may be installed on the upper surface of the concrete pouring, and the ends of the H-shaped steel beams 3, 4 and the H-shaped steel beams 6, 7 may be placed on the jig, as in the case of the first embodiment.

[0020] In the second embodiment of the present invention as described above, in addition to being able to resist vertical loads by a simple structure in which only the upper flanges 31, 41 are joined between the H-shaped steel beams 3, 4, vertical loads can also be resisted by a simple structure in which only the upper flanges 61, 71 are joined between the H-shaped steel beams 6, 7 arranged in intersecting directions. The advantages of joining H-shaped steel beams together at their upper flanges are as described in the first embodiment.

[0021] Similarly to the support plates 34, 44 of the first embodiment, the support plates 64, 74 may be located inside the reinforced concrete column 2, or may be disposed so as to contact the side surface of the reinforced concrete column 2. The support plates 64, 74 do not necessarily have to be joined to all of the upper flanges 61, 71, the webs 62, 72, and the lower flanges 63, 73, and for example, they do not have to be joined to the webs 62, 72.

[0022] (Third embodiment) FIG. 6 is a perspective view of a column-beam joint structure according to a third embodiment of the present invention. In the illustrated example, the column-beam joint structure 21 includes an H-shaped steel beam 6 in addition to the reinforced concrete column 2 and H-shaped steel beams 3 and 4 similar to those in the first embodiment. Note that, for the purpose of explanation, FIG. 6 shows a part of the reinforced concrete beam 2 in perspective. The H-shaped steel beam 6 itself is a member having an upper flange 61, a web 62, and a lower flange 63 similar to the second embodiment described above, but since there is no pair of H-shaped steel beams (H-shaped steel beam 7 in the second embodiment), in this embodiment, it constitutes an "additional H-shaped steel beam" different from "at least one pair of H-shaped steel beams". The H-shaped steel beam 6 extends in a direction intersecting the H-shaped steel beams 3 and 4, and the end of the H-shaped steel beam 6 is butted against the butt portion of the H-shaped steel beams 3 and 4 inside the reinforced concrete column 2. Note that the end face in the material axis direction of the H-shaped steel beam 6 does not necessarily have to be in contact with the H-shaped steel beams 3 and 4. The H-shaped steel beam 6 is joined to the H-shaped steel beams 3 and 4 only by the upper flange 61. Specifically, the upper flanges 31, 41 of the H-shaped steel beams 3, 4 and the upper flange 61 of the H-shaped steel beam 6 are joined to the T-shaped splice plate 9A using bolts 51, 52 and bolt 91, respectively. The web 62 and the lower flange 63 of the H-shaped steel beam 6 are not joined to the H-shaped steel beams 3, 4. Furthermore, a bearing plate 64 is joined to the H-shaped steel beam 6, and the bearing plate 64 is also located inside the reinforced concrete column 2. Note that, like the bearing plates 34, 44, the bearing plate 64 may be arranged so as to contact the side surface of the reinforced concrete column 2.

[0023] In constructing the above-mentioned beam-column joint structure 21, while the reinforced concrete column 2 is being poured, the ends of the H-shaped steel beams 3, 4 are butted together above the top surface of the poured concrete, and further the end of the H-shaped steel beam 6 is butted against the butted parts of the H-shaped steel beams 3, 4. In this state, the splice plate 9A is joined to the upper flanges 31, 41 and the upper flange 61 using bolts 51, 52 and bolt 91, respectively.

[0024] In the illustrated example, in addition to the splice plate 9A, a splice plate 9B is disposed on the lower surface side of each upper flange. The splice plate 9B may be attached only to the upper flanges 31, 41 in a shape similar to that of the splice plate 5B in the first and second embodiments. Alternatively, the splice plate 9B may include an L-shaped or Π-shaped portion and be attached to each of the upper flanges 31, 41 and the upper flange 61. As in the first and second embodiments, the splice plate 9B on the lower surface side may be omitted.

[0025] In addition, in the above example, the T-shaped splice plate 9A is used, but in other examples, the upper flanges 31, 41 may be joined using the splice plate 5A (and the splice plate 5B) similar to the first embodiment, and then the splice plate 5A and the upper flange 61 may be joined using an additional splice plate. In this case, since the additional splice plate is raised from the upper flange 61 by the amount of the splice plate 5A, a spacer is inserted between the additional splice plate and the upper flange 61. Alternatively, the upper flanges 31, 41 of the H-shaped steel beams 3, 4 may be joined by welding, and the upper flange 61 of the H-shaped steel beam 6 may be joined to the upper flanges 31, 41 using a splice plate and a bolt. The upper flanges 31, 41 and the upper flange 61 may also be joined by welding. In addition, when constructing the column-beam joint structure 21 according to the third embodiment, a jig may be installed on the upper surface of the concrete pouring, and the ends of the H-shaped steel beams 3, 4 and the H-shaped steel beam 6 may be placed on the jig, as in the first embodiment.

[0026] FIG. 7 is a diagram showing an external force acting on the beam joint structure shown in FIG. 6, and FIG. 8 is a diagram showing a force resisting the external force shown in FIG. 7. As in the first embodiment, the column-beam joint structure 21 is designed specifically to support vertical loads acting on the H-shaped steel beams 3, 4 and the H-shaped steel beam 6. The support of vertical loads acting on the H-shaped steel beams 3, 4 has already been described with reference to FIG. 3 and FIG. 4. FIG. 7 shows a vertical load P acting on the H-shaped steel beam 6. As shown in FIG. 8, the column-beam joint structure 21 resists a shear force Q and a bending moment M generated in the H-shaped steel beam 6 by the vertical load P. Specifically, concrete bearing pressures B1 and B2 act vertically on the upper flange 61 and the lower flange 63, respectively. Because the bending moment M acts as a tensile force on the upper flange 61 side and a compressive force on the lower flange 63 side, a force acts on the support plate 64 trying to rotate the H-shaped steel beam 6 around the neutral axis, and this force is resisted by the horizontal support pressure B3 of the concrete. Furthermore, the horizontal support pressure B4 of the concrete acting on the webs 32, 42 of the H-shaped steel beams 3, 4 (torsional resistance of the H-shaped steel beams 3, 4) also resists the force trying to rotate the H-shaped steel beam 6 via the joined upper flanges.

[0027] The upper flange 61 is able to resist tensile forces by being joined to the upper flanges 31, 41 of the H-shaped steel beams 3, 4 via splice plates 9A, 9B. The upper flange 61 may be joined by welding, but by using the splice plates 9A, 9B and the bolts 91, the bolts 91 embedded in the concrete act as shear keys (slip-stops), enabling more effective resistance to tensile forces.

[0028] In the second and third embodiments described above, the H-shaped steel beams 6, 7 (or only the H-shaped steel beam 6; hereinafter, also referred to as the H-shaped steel beam on the crossing side) are arranged to extend in a direction crossing the H-shaped steel beams 3, 4. In the example shown in FIG. 5 and FIG. 6, the H-shaped steel beam on the crossing side crosses the H-shaped steel beams 3, 4 at a right angle, but in another example, the H-shaped steel beam on the crossing side may cross the H-shaped steel beams 3, 4 diagonally. In this case, the end face of the H-shaped steel beam on the crossing side may be cut off diagonally and butted against the H-shaped steel beams 3, 4. Alternatively, a gap may be present between the end face of the H-shaped steel beam on the crossing side and the H-shaped steel beams 3, 4 (more specifically, between the upper flanges 31, 41 and the upper flanges of the H-shaped steel beam on the crossing side) due to the angle of crossing, and a splice plate may be spanned across this gap. As already described, regardless of the angle of crossing, the end face of the H-shaped steel beam on the crossing side does not necessarily have to be in contact with the H-shaped steel beams 3, 4.

[0029] Although the preferred embodiment of the present invention has been described in detail above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various modified or amended examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0030] 1,11,21...beam-column joint structure, 2...reinforced concrete column, 21...top surface of concrete pouring, 22...jig, 3,4,6,7...H-shaped steel beam, 31,41,61,71...upper flange, 32,42,62,72...web, 33,43,63,73...lower flange, 34,44,64,74...support plate, 5A,5B,8,9A,9B...splice plate, 51,52,81,82,91...bolt, 53,54...spacer, P...vertical load, Q...shear force, M...bending moment, B1,B2,B3,B4...support pressure.

Claims

1. Concrete pillars and At least one pair of H-shaped steel beams whose ends are butted together inside the concrete column and joined to each other only by upper flanges; At least one pair of bearing plates are connected to each of the at least one pair of H-shaped steel beams and are located inside the concrete column or in contact with the side surfaces of the concrete column; A column-beam joint structure.

2. The column-beam joint structure according to claim 1 , wherein the at least one pair of support plates are joined to the upper flanges, webs and lower flanges of the at least one pair of H-shaped steel beams.

3. 3. The column-beam joint structure according to claim 1, wherein the at least one pair of H-shaped steel beams are bolted together at their upper flanges via splice plates.

4. The at least one pair of H-shaped steel beams includes first and second H-shaped steel beams and third and fourth H-shaped steel beams; The first and second H-shaped steel beams have ends directly butted against each other, The third and fourth H-shaped steel beams extend in a direction intersecting the first and second H-shaped steel beams, and end portions of the third and fourth H-shaped steel beams are indirectly butted against each other via the first and second H-shaped steel beams, The upper flanges of the first and second H-shaped steel beams are joined to each other; The column-beam joint structure according to claim 1 , wherein the upper flanges of the third and fourth H-shaped steel beams are joined to each other.

5. An additional H-shaped steel beam, the end of which is butted against the butt portions of the pair of H-shaped steel beams and only the top flange is joined to the top flange of the pair of H-shaped steel beams; an additional bearing plate connected to the additional H-shaped steel beam and located inside the concrete column or in contact with the side of the concrete column; The column-beam joint structure according to claim 1 , further comprising:

6. A process of butting ends of at least one pair of H-shaped steel beams above a top surface of a concrete column and joining the at least one pair of H-shaped steel beams to each other only with their upper flanges; A step of embedding the butt portions of the at least one pair of H-shaped steel beams in the concrete column by casting the concrete column above the upper surface of the concrete casting, and embedding at least one pair of bearing plates joined to the at least one pair of H-shaped steel beams in the concrete column or contacting the at least one pair of bearing plates with the side surfaces of the concrete column; A manufacturing method of a column-beam joint structure comprising:

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