Column-beam joint structure

Abstract

To provide a column-beam joint structure capable of efficiently realizing a structure having high yield strength and high rigidity while enhancing the yield strength and the rigidity.SOLUTION: A column-beam joint structure according to one embodiment is a column-beam joint structure in which a steel-framed beam 3B crosses to be joined to the side surface of a reinforced concrete column 2. The steel-framed beam 3B has a web 3f extending vertically, a lower flange 3g extending horizontally at a lower end of the web 3f, and an upper flange 3f extending horizontally at an upper end of the web 3h. The column-beam joint structure 1 includes a reinforcing member 5 joined to the side surface part of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g inside the reinforced concrete column 2. The reinforcing member 5 has a through-hole 6 penetrating the reinforcing member 5 in an extending direction in which the steel-framed beam 3B extends.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a beam-column joint structure in which a steel beam is joined to a side portion of a reinforced concrete column. [Background technology]

[0002] Patent Document 1 describes a joint structure between a reinforced concrete member and a steel frame member. The steel frame member has a flange and a web. The end of the steel frame member is embedded in the reinforced concrete member, and holes are formed in the flange and web at the end. The hole formed in the web is provided within a range of 0.3 x the embedded length of the steel frame member from the end of the steel frame member. The hole formed in the flange is provided at a position spaced a predetermined distance from the concrete face position of the reinforced concrete member in which the steel frame member is embedded. The hole formed in the flange is provided so that the bending strength up to the steel frame member position is large against a bending moment assumed to be triangularly distributed at the end of the steel frame member.

[0003] Patent Document 2 describes an RCS beam-column joint structure. The RCS beam-column joint structure joins a reinforced concrete column to a steel beam with flanges on the top and bottom. The end or middle part of the steel beam is embedded in the column. The part of the steel beam embedded in the column is provided with a perforated steel plate located on the surface of the flange opposite the web.

[0004] Patent Document 3 describes a joint structure for a building. In the joint structure, a reinforced concrete column and a steel beam are joined at a column-beam joint of the building. The steel beam has a flange and a web, and penetrates the column. The column-beam joint is provided with a stiffener plate having the same width as the width of the flange of the steel beam. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-31011 A [Patent Document 2] JP 2011-106108 A [Patent Document 3] Japanese Patent Application Publication No. 7-207752 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in a column-beam joint structure, it is required to increase the strength and rigidity. Furthermore, it is required to be able to efficiently construct a column-beam joint structure having high strength and high rigidity. The present disclosure has an object to provide a column-beam joint structure that can increase the strength and rigidity and efficiently construct a structure having high strength and high rigidity. [Means for solving the problem]

[0007] The beam-column joint structure according to the present disclosure is a beam-column joint structure in which a steel beam intersects and is joined to a side portion of a reinforced concrete column. The steel beam has a web extending in the vertical direction, a lower flange extending in the horizontal direction at the lower end of the web, and an upper flange extending in the horizontal direction at the upper end of the web. The beam-column joint structure includes a reinforcing member joined to the side portion of the web, the lower surface of the upper flange, and the upper surface of the lower flange inside the reinforced concrete column. The reinforcing member has a through hole penetrating the reinforcing member in the extension direction, which is the direction in which the steel beam extends.

[0008] In this column-beam joint structure, a steel beam is joined to the side of a reinforced concrete column, and the steel beam has a web, a lower flange, and an upper flange. The column-beam joint structure includes a reinforcing member located inside the reinforced concrete column. The reinforcing member can reinforce the joint between the column and the beam located inside the column. The reinforcing member is joined to the side of the web, the lower surface of the upper flange, and the upper surface of the lower flange. Therefore, since the reinforcing member joined to the side of the web, the lower surface of the upper flange, and the upper surface of the lower flange is provided inside the column, the strength and rigidity of the joint between the column and the beam can be increased. The reinforcing member has a through hole penetrating the reinforcing member in the extension direction of the steel beam. Therefore, the reinforcing member can efficiently transmit stress, which contributes to further improving the strength. Furthermore, since it is only necessary to join the reinforcing member to the side of the web, the lower surface of the upper flange, and the upper surface of the lower flange, a structure with high strength and high rigidity can be efficiently constructed.

[0009] (2) In the above (1), in a cross section perpendicular to the extending direction, the reinforcing member may protrude outward from a region defined by the side portion of the web, the lower surface of the upper flange, and the upper surface of the lower flange. In this case, the reinforcing member is joined to the steel beam so as to protrude outward from the region, thereby making it possible to further improve the strength and rigidity.

[0010] (3) In (1) or (2) above, the through hole may be formed outside the area defined by the side portion of the web, the lower surface of the upper flange, and the upper surface of the lower flange in a cross section perpendicular to the extension direction.

[0011] (4) In (1) or (2) above, the through hole may be formed within an area defined by a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange in a cross section perpendicular to the extension direction.

[0012] (5) In the above (1) or (2), the through hole may be formed at a position that straddles the outer edge of the area defined by the side portion of the web, the lower surface of the upper flange, and the upper surface of the lower flange in a cross section perpendicular to the extension direction.

[0013] (6) In any of the above (1) to (5), a plurality of reinforcing members may be provided aligned along the extension direction. In this case, a plurality of reinforcing members are provided aligned along the extension direction of the steel beam inside the reinforced concrete column, so that the joint between the column and the beam can be further reinforced. Therefore, the strength and rigidity of the joint between the column and the beam can be further increased. Effect of the Invention

[0014] According to the present disclosure, it is possible to increase strength and rigidity, and to efficiently construct a structure having high strength and rigidity. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view showing the appearance of a beam-column joint structure according to a first embodiment. FIG. [Diagram 2] 2 is a side view showing a joint between a column and a beam in the column-beam joint structure of FIG. 1. FIG. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] 1A, 1B, 1C and 1D are diagrams illustrating a method for constructing a beam-column joint structure according to an embodiment. [Diagram 5] FIG. 11 is a side view showing a joint between a column and a beam in a column-beam joint structure according to a modified example. [Figure 6] 1A is a cross-sectional view showing a reinforcing member and a steel beam in a beam-column joint structure according to a modified example, and FIG. 1B is a cross-sectional view showing a reinforcing member and a steel beam in a beam-column joint structure according to a further modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of a beam-column joint structure according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions are omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

[0017] Fig. 1 is a perspective view showing the appearance of a beam-column joint structure 1 according to the first embodiment. As shown in Fig. 1, the beam-column joint structure 1 has a reinforced concrete column 2, a steel beam 3A extending from the reinforced concrete column 2 along a first direction D1, and a steel beam 3B extending from the reinforced concrete column 2 along a second direction D2 intersecting the first direction D1. For example, the steel beam 3A and the steel beam 3B are H-shaped steel.

[0018] The reinforced concrete column 2 extends along a third direction D3 that intersects both the first direction D1 and the second direction D2. For example, the first direction D1 is a horizontal direction, and the second direction D2 is a horizontal direction and perpendicular to the first direction D1. For example, the third direction D3 is a vertical direction. The reinforced concrete column 2 has a side portion 2b that extends in both the first direction D1 and the third direction D3, and a side portion 2c that extends in both the second direction D2 and the third direction D3. In this embodiment, the "side portion" refers to a surface that faces the horizontal direction.

[0019] The steel beam 3A is joined to the side surface portion 2c, and the steel beam 3B is joined to the side surface portion 2b. For example, the beam-column joint structure 1 has a pair of steel beams 3A aligned along the first direction D1. For example, in a plan view, the pair of steel beams 3A extending from the reinforced concrete column 2 and the pair of steel beams 3B extending from the reinforced concrete column 2 form a cross shape.

[0020] However, the number of steel beams 3A and the number of steel beams 3B do not have to be 2, and at least one of the number of steel beams 3A and the number of steel beams 3B may be 1. In this case, the steel beams 3A and 3B extending from the reinforced concrete column 2 are T-shaped or L-shaped in plan view.

[0021] For example, the reinforced concrete column 2 has a joint portion 2d where the steel beams 3A and 3B are joined, a downward extension portion 2f located below the joint portion 2d, and an upward extension portion 2g extending above the joint portion 2d. The steel beams 3A and 3B extend from the joint portion 2d along the first direction D1 and the second direction D2.

[0022] For example, the steel beam 3A has a web 3b extending vertically, a bottom flange 3c extending horizontally at the bottom end of the web 3b, and a top flange 3d extending horizontally at the top end of the web 3b. The web 3b extends along both the first direction D1 and the third direction D3 and has a thickness in the second direction D2. The bottom flange 3c and the top flange 3d extend in both the first direction D1 and the second direction D2 and have a thickness in the third direction D3.

[0023] For example, the steel beam 3B has a web 3f extending vertically, a bottom flange 3g extending horizontally at the bottom end of the web 3f, and a top flange 3h extending horizontally at the top end of the web 3f. The web 3f extends along both the second direction D2 and the third direction D3 and has a thickness in the first direction D1. The bottom flange 3g and the top flange 3h extend in both the first direction D1 and the second direction D2 and have a thickness in the third direction D3.

[0024] Fig. 2 is a side view showing a joint portion 2d between a steel beam 3B and a reinforced concrete column 2. As shown in Fig. 2, for example, at the joint portion 2d, the steel beam 3B is embedded in concrete C and penetrates the reinforced concrete column 2. In this case, the steel beam 3A is separated at the joint portion 2d, and a pair of steel beams 3A extend from the joint portion 2d.

[0025] The beam-column joint structure 1 includes a reinforcing member 5 located inside the reinforced concrete column 2. For example, the reinforcing member 5 is fixed to a side portion of the steel beam 3B. As an example, the reinforcing member 5 is fixed to the steel beam 3B in advance at a factory. For example, the beam-column joint structure 1 includes a plurality of reinforcing members 5, and the plurality of reinforcing members 5 are arranged along the second direction D2.

[0026] For example, the sizes (thickness or size in the direction perpendicular to the plate thickness) of the multiple reinforcing members 5 are the same. However, the sizes of the multiple reinforcing members 5 do not have to be the same. In this case, multiple reinforcing members 5 having different sizes may be placed inside the reinforced concrete column 2. In this way, the size of the reinforcing members 5 can be changed as appropriate.

[0027] For example, a pair of reinforcing members 5 are arranged at positions symmetrical to each other with respect to a reference line L that passes through the center of the reinforced concrete column 2 in the width direction and extends along the third direction D3. In this case, the distance from one of the pair of reinforcing members 5 to the reference line L is the same as the distance from the other of the pair of reinforcing members 5 to the reference line L. In this embodiment, "same" does not only mean the case where they are strictly same, but also includes the case where they are slightly different but provide the same effect as when they are same (for example, when they are approximately same).

[0028] Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. As shown in Figs. 2 and 3, the reinforcing member 5 has a flat plate shape. As an example, the reinforcing member 5 is a steel plate. Inside the reinforced concrete column 2, the reinforcing member 5 is joined to the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g. For example, the reinforcing member 5 is fixed to the web 3f, the lower flange 3g, and the upper flange 3h of the steel beam 3B by welding.

[0029] For example, the beam-column joint structure 1 has a pair of reinforcing members 5 aligned along the first direction D1 in a cross section perpendicular to the second direction D2. One of the pair of reinforcing members 5 is fixed to one side (e.g., the left side) of the web 3f of the steel beam 3B, and the other of the pair of reinforcing members 5 is fixed to the other side (e.g., the right side) of the web 3f of the steel beam 3B.

[0030] In a cross section perpendicular to the second direction D2, the reinforcing member 5 protrudes outward from an area A defined by the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g. That is, the end of the reinforcing member 5 in the first direction D1 protrudes from the end of the steel beam 3B in the first direction D1.

[0031] For example, the reinforcing member 5 has a first upper surface 5b, a second upper surface 5c, a side surface 5d, a first lower surface 5f, and a second lower surface 5e. The first upper surface 5b is fixed to the lower surface of the upper flange 3h and extends in the first direction D1. The second upper surface 5c, the side surface 5d, and the second lower surface 5e are portions that protrude from the region A. The second upper surface 5c is provided on an extension of the first upper surface 5b and extends along the first direction D1.

[0032] The first lower surface 5f is fixed to the upper surface of the lower flange 3g and extends in the first direction D1. The second lower surface 5e is provided on an extension of the first lower surface 5f and extends along the first direction D1. The side surface 5d extends from the second upper surface 5c to the second lower surface 5e and extends along the third direction D3.

[0033] The reinforcing member 5 has a through hole 6 penetrating the reinforcing member 5 in the second direction D2, which is the direction in which the steel beam 3B extends. For example, the shape of the through hole 6 when viewed along the second direction D2 is circular. However, the shape of the through hole 6 may be an oval or elliptical shape. Furthermore, the shape of the through hole 6 may be a polygonal shape such as a triangular shape or a rectangular shape. In this way, the shape of the through hole 6 can be changed as appropriate.

[0034] The through hole 6 penetrates the reinforcing member 5 in the plate thickness direction. The reinforcing member 5 is embedded in concrete C. For example, the reinforcing member 5 is a perforated steel plate dowel embedded in the concrete C inside the reinforced concrete column 2. For example, the reinforcing member 5, which is a perforated steel plate dowel, and the steel beam 3B are integrated by welding.

[0035] The through hole 6 is formed outside an area A defined by the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g in a cross section perpendicular to the second direction D2. For example, the reinforcing member 5 has a plurality of through holes 6. The plurality of through holes 6 are aligned along the third direction D3.

[0036] For example, the sizes of the multiple through holes 6 are the same. However, the sizes of the multiple through holes 6 may be different from each other. As an example, through holes 6 with large diameters and through holes 6 with small diameters may be arranged alternately. In this way, the size and arrangement of the through holes 6 can be changed as appropriate.

[0037] Unlike the example of FIG. 3, a plurality of through holes 6 may be arranged along the first direction D1. As an example, the number of through holes 6 arranged along the third direction D3 is greater than the number of through holes 6 arranged along the first direction D1. For example, the number of through holes 6 arranged along the third direction D3 is four, and the number of through holes 6 arranged along the first direction D1 is one. In this case, the reinforcing member 5 has four through holes 6.

[0038] Next, a method for constructing the column-beam joint structure 1 will be described with reference to Figs. 4(a) to 4(d). An example of a method for constructing the column-beam joint structure 1 by cast-in-place construction will be described below. First, the downward extension 2f of the reinforced concrete column 2 is constructed. In addition, a reinforcing member 5 is fixed to the steel beam 3B. For example, the reinforcing member 5 is inserted into the area A defined by the web 3f, bottom flange 3g, and top flange 3h of the steel beam 3B, and the reinforcing member 5 is fixed to the web 3f, bottom flange 3g, and top flange 3h by welding.

[0039] For example, two reinforcing members 5 arranged along the extension direction of the steel beam 3B are fixed to the steel beam 3B by welding. Then, as shown in FIG. 4(b), the steel beam 3B is placed on the top surface of the downward extension portion 2f. For example, the steel beam 3A and the steel beam 3B are joined to each other in advance, and the joined steel beam 3A and the steel beam 3B are placed on the top surface of the downward extension portion 2f. A single or multiple reinforcing members 5 may be fixed to the portion of the steel beam 3A that is placed on the top surface. Note that the steel beam 3A is not shown in FIG. 4(b) to FIG. 4(d) for simplification.

[0040] Thereafter, as shown in Fig. 4(c), a formwork is installed so as to surround the portion of the top surface of the downward extension 2f on which the steel beams 3A, 3B are placed, and concrete C is poured into the formwork to construct the joint portion 2d of the reinforced concrete column 2. After the concrete C in the joint portion 2d has hardened, the formwork is removed. Then, as shown in Fig. 4(d), an upward extension portion 2g is constructed on top of the joint portion 2d. Through the above steps, the construction of the column-beam joint structure 1 is completed.

[0041] Next, the effects obtained from the beam-column joint structure 1 according to this embodiment will be described. In the beam-column joint structure 1, a steel beam 3B is joined to a side portion 2c of a reinforced concrete column 2, and the steel beam 3B has a web 3f, a lower flange 3g, and an upper flange 3h. The beam-column joint structure 1 includes a reinforcing member 5 located inside the reinforced concrete column 2. The reinforcing member 5 can reinforce a joint portion 2d located inside the reinforced concrete column 2 between the reinforced concrete column 2 and the steel beam 3B.

[0042] The reinforcing member 5 is joined to the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g. Therefore, the reinforcing member 5 joined to the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g is provided inside the reinforced concrete column 2, so that it is possible to increase the strength and rigidity of the joint portion 2d between the reinforced concrete column 2 and the steel beam 3B. In other words, by providing the reinforcing member 5, it is possible to improve the strength and rigidity of the joint portion 2d by transmitting the shear stress with the concrete C of the joint portion 2d.

[0043] 3, in this embodiment, the reinforcing member 5 has a through hole 6 that penetrates the reinforcing member 5 in the extension direction of the steel beam 3B. Therefore, stress can be efficiently transmitted in the reinforcing member 5, which contributes to further improving the strength. Furthermore, since the reinforcing member 5 can be joined to the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g, a structure with high strength and high rigidity can be efficiently constructed.

[0044] In this embodiment, in a cross section perpendicular to the extending direction, the reinforcing member 5 protrudes outward from an area A defined by the side portion of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g. In this case, by joining the reinforcing member 5 to the steel beam 3B so as to protrude outward from the area A, it is possible to further improve the strength and rigidity.

[0045] 2, in this embodiment, the beam-column joint structure 1 includes a plurality of reinforcing members 5 arranged along the extension direction. In this case, since a plurality of reinforcing members 5 arranged along the extension direction (second direction D2) of the steel beam 3B are provided inside the reinforced concrete column 2, the joint portion 2d between the reinforced concrete column 2 and the steel beam 3B can be further reinforced. Therefore, the strength and rigidity of the joint portion 2d between the reinforced concrete column 2 and the steel beam 3B can be further increased.

[0046] In this embodiment, the beam-column joint structure 1 includes a pair of reinforcing members 5 arranged along the extension direction of the steel beam 3B inside the concrete C of the joint portion 2d. For example, when a bending moment occurs in the steel beam 3B, an upward shear force acts on one of the pair of reinforcing members 5, and a downward shear force acts on the other of the pair of reinforcing members 5. Furthermore, in the beam-column joint structure 1 according to this embodiment, stress can be efficiently transmitted by the reinforcing members 5, which are perforated steel plate dowels with high rigidity.

[0047] Next, a modified column-beam joint structure 11 will be described with reference to Fig. 5. A portion of the configuration of the column-beam joint structure 11 is the same as a portion of the configuration of the above-described column-beam joint structure 1. Therefore, in the following description, the same reference numerals will be used to denote portions that overlap with the configuration of the column-beam joint structure 1, and descriptions thereof will be omitted as appropriate.

[0048] The beam-column joint structure 11 has a steel beam 13 extending out to one side (second direction D2) from the reinforced concrete column 2, instead of the steel beam 3B penetrating the reinforced concrete column 2. The steel beam 13 has an end held by the reinforced concrete column 2. A reinforcing member 5 is fixed to a side portion of the steel beam 13. For example, the reinforcing member 5 functions as a reinforcing rib plate (FBP: Face Bearing Plate) of the joint portion 2d.

[0049] The position at which the reinforcing member 5 is fixed in the column-beam joint structure 11 is, for example, the same as the position at which the reinforcing member 5 is fixed in the column-beam joint structure 1. The column-beam joint structure 11 provides the same effects as the column-beam joint structure 1.

[0050] Next, a reinforcing member 15 according to a modified example will be described with reference to FIG. 6(a). The reinforcing member 15 is joined to the side surface of the steel beam 3B instead of or together with the reinforcing member 5. The reinforcing member 15 differs from the reinforcing member 5 in the position of the through hole 6. The through hole 6 is formed in a position that straddles the outer edge A1 of the area A defined by the side surface of the web 3f, the lower surface of the upper flange 3h, and the upper surface of the lower flange 3g in a cross section perpendicular to the extension direction of the steel beam 3B. As an example, the through hole 6 is arranged so that its center is located at the outer edge A1. However, the through hole 6 may be arranged so that its center is shifted from the outer edge A1.

[0051] A further modified reinforcing member 25 will be described with reference to Fig. 6(b). Reinforcing member 25 is fixed to the side surface of steel beam 3B instead of reinforcing member 5 or together with reinforcing member 5 (or reinforcing member 15). Through hole 6 is formed inside area A defined by the side surface of web 3f, the lower surface of upper flange 3h, and the upper surface of lower flange 3g in a cross section perpendicular to the extension direction of steel beam 3B.

[0052] 6(b) shows an example in which all the through holes 6 are disposed inside the region A. However, any of the multiple through holes 6 may be formed outside the region A, or any of the multiple through holes 6 may be formed in a position straddling the outer edge A1 of the region A. As described above, the position of the through holes 6 in the reinforcing member can be changed as appropriate.

[0053] The embodiment and various modified examples of the column-beam joint structure according to the present disclosure have been described above. However, the column-beam joint structure according to the present disclosure may be further modified within the scope of the gist described in the claims. In other words, the shape, size, material, number, and arrangement of each part of the column-beam joint structure according to the present disclosure can be appropriately modified within the scope of the above gist.

[0054] For example, in the above-mentioned embodiment, the method for constructing the beam-column joint structure 1 in which the downward extension 2f, the steel beams 3A and 3B, the joint portion 2d, and the upward extension 2g are constructed by on-site casting has been described. However, in the method for constructing the beam-column joint structure 1 according to the present disclosure, at least one of the downward extension 2f, the steel beams 3A and 3B, the joint portion 2d, and the upward extension 2g may be constructed by precasting. In this case, the downward extension 2f may be manufactured in advance in a factory. Also, a structure in which the downward extension 2f, the steel beams 3A and 3B, and the joint portion 2d are integrated may be manufactured in a factory. In this case, the upward extension 2g only needs to be constructed on the joint portion 2d at the site, which contributes to the efficiency of the work.

[0055] In the above embodiment, an example has been described in which both the steel beam 3A and the steel beam 3B are H-shaped steel. However, at least one of the steel beam 3A and the steel beam 3B may be an I-shaped steel. Furthermore, in the column-beam joint structure, either the steel beam 3A or the steel beam 3B may be an RC beam.

[0056] In the above-described embodiment, the column-beam joint structure 1 including a pair of reinforcing members 5 has been described. However, the number of reinforcing members 5 in the column-beam joint structure may be one, or may be three or more, and is not particularly limited. In the above-described embodiment, an example in which the number of through holes 6 formed in the reinforcing member 5 is four has been described. However, the number of through holes 6 may be one or more and three or less, or may be five or more. [Explanation of symbols]

[0057] 1...beam-column joint structure, 2...reinforced concrete column, 2b...side portion, 2c...side portion, 2d...joint portion, 2f...downward extension portion, 2g...upward extension portion, 3A, 3B...steel beam, 3b...web, 3c...bottom flange, 3d...top flange, 3f...web, 3g...bottom flange, 3h...top flange, 5...reinforcing member, 6...through hole, 11...beam-column joint structure, 13...steel beam, 15, 25...reinforcing member, A...area, A1...outer edge, C...concrete, D1...first direction, D2...second direction, D3...third direction, L...reference line.

Claims

1. A column-beam joint structure in which a steel beam is cross-joined to the side of a reinforced concrete column, The steel beam has a web extending in a vertical direction, a lower flange extending in a horizontal direction at a lower end of the web, and an upper flange extending in a horizontal direction at an upper end of the web, A reinforcing member is provided inside the reinforced concrete column and joined to a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange; The reinforcing member has a through hole penetrating the reinforcing member in an extension direction, which is a direction in which the steel beam extends. Column beam joint structure.

2. In a cross section perpendicular to the extension direction, the reinforcing member protrudes outward from a region defined by a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange. The column-beam joint structure according to claim 1 .

3. The through hole is formed outside an area defined by a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange in a cross section perpendicular to the extension direction. The column-beam joint structure according to claim 1 or 2.

4. The through hole is formed within an area defined by a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange in a cross section perpendicular to the extension direction. The column-beam joint structure according to claim 1 or 2.

5. The through hole is formed at a position straddling an outer edge of an area defined by a side portion of the web, a lower surface of the upper flange, and an upper surface of the lower flange in a cross section perpendicular to the extension direction. The column-beam joint structure according to claim 1 or 2.

6. The reinforcing member includes a plurality of reinforcing members arranged along the extending direction. The column-beam joint structure according to claim 1 or 2.

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