Joint structure between beam and column and beam framework structure

Abstract

To provide: a beam-to-column joint structure that can expand the effective dimensions of a space under a beam and reduce costs by eliminating the risk of column collapse in beam-priority rigid frame structure and by eliminating the need to install a separate column that only receives the load of a reinforcing beam, in addition to the column that receives horizontal forces; and beam frame structure using the beam-to-column joint structure.SOLUTION: A beam-column joint structure 1a includes reinforcing beams 3 each having a horizontally long body part 30 and a reinforcing part 31 fixed along a lower surface of the body part 30, and rigid frame columns 4 each having an upper end to which an end of the reinforcing beams 3 is joined and supporting the end of the reinforcing beams 3. At the end of the reinforcing beam 3, a main body projection part 37 where the main body part 30 projects longer than the reinforcing part 31 in the longitudinal direction is formed, and the upper end of the rigid frame column 4 abuts on the lower surface of the main body projection part 37 and is rigidly joined.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a joint structure between a beam and a column and a beam framework structure using the joint structure between the beam and the column.

Background Art

[0002] In recent years, in order to form a wider column-free space, a reinforced beam has been proposed in which a steel reinforcing part is fixed to the lower side along the beam body to reinforce the beam body so that it can be used with a longer span. For example, the reinforced beams described in Patent Documents 1 and 2 are formed by fixing CT steel having an inverted T-shaped cross section to the lower flange of a beam body of an H-shaped steel provided with flanges up and down. According to this reinforced beam, since the strength is higher than that of a general H-shaped steel beam, the distance between the columns and beams that are the fulcrums of the reinforced beam can be increased, and a wider column-free space can be formed.

[0003] Further, Patent Document 3 describes a portal frame including a ladder-shaped beam in which an upper chord member and a lower chord member are connected by a plurality of vertical members, and a ladder-shaped column in which two columns are connected by a plurality of horizontal members. According to this, an opening with a large span can be formed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, when rigidly joining the reinforcing beam and the ramen column in the ramen structure, the reinforcing part and the ramen column interfere with each other, making it difficult to construct with the beam being stronger. Therefore, when it is desired to adopt the beam-stronger construction method, the ramen column is joined to another non-reinforced beam or the like, and the end of the reinforcing beam is joined to the said beam. In this case, in order to receive the load of the reinforcing beam, it becomes necessary to arrange a support column separately from the ramen column.

[0006] Also, in the ramen structure, if only the beam is reinforced, the strength of the ramen column becomes relatively weak, and there is a risk that a structurally disadvantageous column collapse is likely to occur.

[0007] Therefore, an object of the present invention is to provide a joint structure between a beam and a column that can prevent column collapse even in a beam-stronger ramen structure, eliminate the need to separately install a column that only receives the load of the reinforcing beam separately from the column that receives the horizontal force, expand the effective dimension of the space under the beam, and reduce costs, and a beam structure using the joint structure between the beam and the column.

Means for Solving the Problem

[0008] To solve the above problems, the first invention of the present application is a joint structure between a beam and a column, comprising a reinforcing beam having a main body portion that is long in the horizontal direction and a reinforcing portion fixed along the lower surface of the main body portion, and a ramen column having the end of the reinforcing beam joined to the upper end thereof to support the end of the reinforcing beam. The end of the reinforcing beam has a main body protruding portion where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, and the upper end of the ramen column is in contact with the lower surface of the main body protruding portion and is rigidly joined , the ramen column includes a column body made of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column body, and the upper end plate and the reinforcing portion are arranged with a gap therebetween. 。

[0009] The second invention of the present application is the joint structure between a beam and a column according to the first invention, wherein the main body portion is an H-shaped steel with flanges formed vertically, and the reinforcing portion is a CT-shaped steel with a web arranged upward and a flange formed on the lower side.

[0010] The third invention of the present application is the joint structure between a beam and a column according to the second invention, The upper end plate is fixed to the upper ends of the two flanges of the column body respectively and has two flat plate portions extending horizontally. Along the upper end of the web of the column body, the length in the flange width direction of the column body is formed to be narrower than that of the two flat plate portions, and a connecting portion connecting the two flat plate portions. The flat plate portion has a structural joining hole for inserting a bolt for joining to the lower flange of the main body portion of the reinforcing beam. When the upper end plate is joined to the lower flange of the main body portion, an exterior fixing hole for fixing an exterior member of the building is formed in the lower flange of the main body portion. At least one of the exterior fixing holes is exposed between the two upper end plates and at a position not covered by the connecting portion. 。

[0011] The fourth invention of the present application is a joint structure between a beam and a column of the third invention, and The reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protruding portion contacting the entire upper surface of the upper end plate. .

[0012] The fifth invention of the present application is A joint structure between a beam and a column includes a reinforcing beam having a horizontally long main body portion and a reinforcing portion fixed along the lower surface of the main body portion, and a ramen column having the end portion of the reinforcing beam joined to the upper end to support the end portion of the reinforcing beam. The end portion of the reinforcing beam has a main body protruding portion where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion. The upper end of the ramen column is in rigid contact with the lower surface of the main body protruding portion. The main body portion is an H-shaped steel with flanges formed vertically, the reinforcing portion is a CT-shaped steel with a web arranged upward and a flange formed on the lower side, and the ramen column includes a column body made of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column body. , The upper end plate has two flat plate portions that are respectively fixed to the upper ends of the two flanges of the column body and extend horizontally, and a connecting portion that is formed narrower in the flange width direction of the column body than the two flat plate portions along the upper end of the web of the column body and connects the two flat plate portions. The flat plate portion is formed with a structural joining hole for inserting a bolt that joins to the lower flange of the main body portion of the reinforcing beam. The reinforcing beam has the lower surface of the main body protruding portion in contact with one flat plate portion of the upper end plate and bolt-joined thereto, and a beam laid in a direction orthogonal to the reinforcing beam is bolt-joined to the other flat plate portion of the upper end plate. .

[0013] The sixth invention of the present application is Fifth Invention a joint structure between a beam and a column of, and When the upper end plate is joined to the lower flange of the main body portion, an exterior fixing hole for fixing an exterior member of a building is formed in the lower flange of the main body portion, and at least one of the exterior fixing holes is exposed between the two upper end plates and at a position not covered by the connecting portion. .

[0014] The seventh invention of the present application is Sixth Invention a joint structure between a beam and a column of, and The upper end plate and the reinforcing portion are arranged with a gap therebetween. .

[0015] The eighth invention of the present application is a beam frame structure. The reinforcing beam has both ends of the main body portion protruding longer in the longitudinal direction than the reinforcing portion to form the main body protruding portions. The ramen columns are respectively erected at both ends of the reinforcing beam. At both ends of the reinforcing beam, a joint structure between a beam and a column according to any one of the first to seventh above is provided, and the reinforcing beam is erected between the two ramen columns.

[0016] The ninth invention of the present application is a beam frame structure. At least one end of the main body portion protrudes longer in the longitudinal direction than the reinforcing portion to form the main body protruding portion. The ramen column is erected at at least one end of the reinforcing beam. At one end of the reinforcing beam, a joint structure between a beam and a column according to any one of the first to seventh above is provided. [Effect of the Invention]

[0017] According to the first invention of the present application, since the reinforcing beam has a main body protruding portion at its end where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, the main body protruding portion is not reinforced by the reinforcing portion, and the upper end of the ramen column abuts against the lower surface of the main body protruding portion which is an unreinforced part and is rigidly joined. Thus, it is possible to have a ramen structure with a beam that is stronger than the column while making the structure less likely to cause column collapse. Also, since the main body protruding portion is directly rigidly joined to the ramen column, the ramen column can receive the horizontal force and the vertical load of the reinforcing beam, and there is no need to separately install a column that only receives the load of the reinforcing beam. Therefore, compared with the case of providing a column separate from the ramen column, the effective dimension of the space under the beam can be enlarged and the cost can be reduced. According to the first invention, in addition to the effect of the second invention, the ramen column includes a column body of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column body. Thus, the upper end plate can be easily attached by contacting the lower surface of the lower flange of the main body portion of the reinforcing beam. According to the first invention, in addition to the effect of the third invention, since the upper end plate and the reinforcing portion are arranged with a gap therebetween, the bolt joining operation between the upper end plate and the main body portion of the reinforcing beam becomes easier to construct, and the operation of winding a fireproof coating material around the reinforcing beam is facilitated by the gap.

[0018] According to the second invention of the present application, in addition to the effects of the first invention, since the main body portion is an H-shaped steel and the reinforcing portion is a CT-shaped steel with the web facing upward and a flange formed on the lower side, the reinforcing portion is open toward the side. Since the main body portion is the same H-shaped steel as a general beam, for example, when attaching a desired member such as an exterior material to the beam, it can be attached with the same fit and the same joining members as in the case of attaching to a general beam, and there is no need to design new parts for attaching the member, etc., and the cost increase can be suppressed. In particular, when attaching a desired member to the lower flange of the main body portion, since the reinforcing portion is a CT steel, the flange of the reinforcing portion is not overlapped with the lower flange of the main body portion, and since the reinforcing portion is open toward the side, the desired member can be easily attached with the conventional fit without interference from the reinforcing portion.

[0019] According to the third invention of the present application, in addition to the effect of the second invention, the upper end plate of the ramen column has two flat plate portions that are respectively fixed to the upper ends of the two flanges of the column body and extend horizontally, and a connecting portion that is formed narrower than the two flat plate portions along the upper end of the web of the column body and connects the two flat plate portions. Structural joining holes for joining the reinforcing beam and the ramen column are formed in the flat plate portion, and since the connecting portion is narrow, the lower flange of the main body portion of the reinforcing beam is exposed on the side of the connecting portion, and the exterior fixing hole formed in the lower flange is exposed. Therefore, the exterior member can be attached to the main body portion of the reinforcing column without interfering with the upper end plate.

[0020] According to the fourth invention of the present application, in addition to the effects of the third invention, Since the lower surface of the main body protrusion of the reinforcing beam abuts against the entire upper surface of the upper end plate and is bolted to the two flat plate portions, the end of the reinforcing beam and the column head of the ramen column can be rigidly joined with sufficient strength, and the ramen column can sufficiently receive the vertical load and horizontal bearing capacity of the reinforcing beam.

[0021] According to the fifth invention of the present application, Since the reinforcing beam has a main body protrusion at its end where the main body part protrudes longer in the longitudinal direction than the reinforcing part, the main body protrusion is not reinforced by the reinforcing part, and the upper end of the ramen column abuts against and is rigidly joined to the lower surface of the main body protrusion which is an unreinforced part. Thus, it is possible to achieve a ramen structure with a beam that is stronger than the column while making the structure less prone to column collapse. Also, since the main body protrusion is directly rigidly joined to the ramen column, the ramen column can receive the horizontal force and the vertical load of the reinforcing beam together, eliminating the need to separately install a column that only receives the load of the reinforcing beam. Therefore, compared to the case of providing a column separate from the ramen column, the effective dimension of the space under the beam can be expanded and the cost can be reduced. Also, according to the fifth invention, since the main body part is an H-shaped steel and the reinforcing part is a CT-shaped steel with the web facing upward and a flange formed on the lower side, the reinforcing part is open toward the side. Since the main body part is the same H-shaped steel as a general beam, for example, when attaching a desired member such as an exterior material to the beam, it can be attached with the same fit and the same joining members as in the case of attaching to a general beam, eliminating the need to design new parts for attaching the member and suppressing cost increases. In particular, when attaching a desired member to the lower flange of the main body part, since the reinforcing part is a CT steel, the flange of the reinforcing part is not arranged by overlapping it on the lower flange of the main body part, and since the reinforcing part is open toward the side, the desired member can be easily attached with the conventional fit without interference from the reinforcing part. Also, according to the fifth invention, since the ramen column includes a column main body of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column main body, the upper end plate can abut against the lower surface of the lower flange of the main body part of the reinforcing beam and can be easily attached. According to the fifth invention, the reinforcing beam is rigidly joined by the lower surface of the main body protrusion abutting against one flat plate portion of the upper end plate and being bolted, and the beam laid in the direction orthogonal to the reinforcing beam is bolted to the other flat plate portion of the upper end plate, so that the load of the orthogonal beam can also be received by the ramen column, and there is no need to provide a separate column, thus expanding the effective space under the beam. Further, since a beam orthogonal to the reinforcing beam can be arranged as required, for example, the degree of freedom in design can be increased when a cantilever eaves is projected in the direction orthogonal to the reinforcing beam.

[0022] According to the sixth invention of the present application, Fifth Invention in addition to the effects of The upper end plate of the ramen column has two flat plate portions fixed to the upper ends of the two flanges of the column main body and extending horizontally, and is formed narrower than the two flat plate portions along the upper end of the web of the column main body, and has a connecting portion connecting the two flat plate portions. Structural joining holes for joining the reinforcing beam and the ramen column are formed in the flat plate portions, and since the connecting portion is narrow, the lower flange of the main body portion of the reinforcing beam is exposed on the side of the connecting portion, and the exterior fixing holes formed in the lower flange are exposed, so that the exterior member can be attached to the main body portion of the reinforcing column without interfering with the upper end plate.

[0023] According to the seventh invention of the present application, Sixth Invention in addition to the effects of Since the upper end plate and the reinforcing portion are arranged with a gap therebetween, the bolt joining operation between the upper end plate and the main body portion of the reinforcing beam is easy to construct, and the operation of winding a fireproof coating material around the reinforcing beam is facilitated by the gap.

[0024] According to the eighth invention of the present application, the joint structure between any one of the first to seventh beams and columns is provided at both ends of the reinforcing beam, and the reinforcing beam is installed between two ramen columns. Therefore, while making both ends of the reinforcing beam a strong gable frame structure with beam superiority, it is possible to make a structure in which column collapse is unlikely to occur. By rigidly joining a reinforcing beam with beam superiority directly to the ramen column, there is no need to install a column separate from the ramen column, and the space under the beam between the two ramen columns can be maximally and effectively utilized.

[0025] According to the ninth invention of the present application, since the joint structure between any one of the first to seventh beams and columns is provided at one end of the reinforcing beam, while fixing one end of the reinforcing beam to the ramen column with beam superiority, it is possible to make a structure in which column collapse is unlikely to occur, and the structure for supporting the other end of the reinforcing beam can be freely designed, and the degree of freedom in designing the space adjacent to the beam frame structure can be increased.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 10

Mode for Carrying Out the Invention

[0027] 〔First Embodiment〕 Hereinafter, a first embodiment of the beam-column joint structures 1a and 1b of the present invention and the beam framework structures 2a, 2b, and 2c including the beam-column joint structures 1a and 1b will be described with reference to FIGS. 1 to 4. The beam framework structure 2a is a structure used for a part of the structural frame of a building having a ramen structure of a heavy steel frame, and forms a column-free large space under the beam of the beam framework structure 2a. Note that the building in which the beam framework structure 2a is used is not limited to a building having a ramen structure of a heavy steel frame, and may be, for example, a combination of a ramen structure of a heavy steel frame and another structure such as an RC structure.

[0028] As shown in FIG. 1, the beam framework structure 2a in the present embodiment is a portal ramen framework in which ramen columns 4 are erected at both ends of a reinforcing beam 3, and both ends of the reinforcing beam 3 and the respective ramen columns 4 are joined by the beam-column joint structure 1a of the present embodiment described later, so that the reinforcing beam 3 is installed between the two ramen columns 4. Further, the beam-column joint structure 1a of the present embodiment is a structure that joins a reinforcing beam 3 having a horizontally long main body portion 30 and a reinforcing portion 31 fixed along the lower surface of the main body portion 30, and a ramen column 4 having the end portion of the reinforcing beam 3 joined to the upper end and supporting the end portion of the reinforcing beam 3.

[0029] As shown in FIGS. 2 and 4, the main body portion 30 of the reinforcing beam 3 is an H-shaped steel in which upper and lower flanges 32 and 33 are horizontally and parallel to each other, and a vertical web 34 is formed to connect the upper and lower flanges 32 and 33. The main body portion 30 is formed, for example, with a width of 125 mm and a height of 250 mm, and is formed in a large span with a length exceeding 6 m. The H-shaped steel forming the main body portion 30 is preferably an H-shaped steel generally used as a beam in a building with a weight-bearing steel frame structure. By configuring the main body portion 30 with an H-shaped steel generally used as a beam, members such as exterior materials (not shown) attached to a general beam and structural materials such as other beams or columns can be fixed to the main body portion 30 of the reinforcing beam 3 without changing the shape and dimensions, and an increase in the number of members due to the use of the reinforcing beam 3 can be suppressed. A plurality of holes into which bolts can be inserted are arranged side by side in the longitudinal direction on each of the upper and lower flanges 32 and 33 of the main body portion 30, enabling the attachment of desired members such as exterior materials and the joining of the main body portion 30 to the column heads and column feet of each column.

[0030] The reinforcing portion 31 of the reinforcing beam 3 is a CT-shaped steel in which a web 35 is arranged upward and a flange 36 is horizontally arranged on the lower side, and the cross section is an inverted T shape. The reinforcing portion 31 has a flange width that is the same length as the flange width of the main body portion 30. For example, the flange width is formed to be 125 mm, and the height of the reinforcing portion 31 is formed to be 200 mm. The length of the reinforcing portion 31 is formed to be, for example, 800 mm or more shorter than the length of the main body portion 30, and both ends of the main body portion 30 protrude 400 mm or more longer than both ends of the reinforcing portion 31, respectively, forming a main body protruding portion 37. By welding the upper end of the web 35 of the reinforcing portion 31 to the center in the width direction of the lower surface of the main body portion 30, the flange 36 of the reinforcing portion 31 is arranged horizontally and parallel to the upper and lower flanges 32 and 33 of the main body portion 30, and the reinforcing portion 31 reinforces the main body portion 30 of the H-shaped steel.

[0031] Note that the dimensions of each part of the reinforcing beam 3 are not limited to those described above. As long as the required strength of the reinforcing beam 3 can be obtained and the upper end of the ramen column 4 can abut against the lower surface of the main body protruding portion 37 of the reinforcing portion 31, it is not particularly limited.

[0032] In the present embodiment, the reinforcing portion 31 is formed of a CT-shaped steel, but the reinforcing portion 31 in the present invention is not limited to this, and any cross-sectional shape may be used as long as it can reinforce the required strength of the main body portion 30 of the H-shaped steel. Although not shown, for example, the reinforcing portion may be formed of an H-shaped steel. In such a case, the lower flange of the main body portion 30 and the upper flange of the reinforcing portion formed of the H-shaped steel can be fixed with bolts and nuts to form the reinforcing beam 3. Although not shown, for example, the reinforcing portion may be formed of a channel steel or a lipped channel steel. In such a case, the reinforcing beam 3 can be formed by holding the reinforcing portion so that the upper side is open and welding both ends of the opening to the lower surface of the lower flange of the main body portion 30. The reinforcing portion is adopted with an appropriate cross-sectional shape in consideration of the strength required for the reinforcing beam 3 and the interference with the peripheral members of the reinforcing beam 3.

[0033] In addition, if the reinforcing portion 31 is formed of a CT-shaped steel, when attaching a desired member such as an exterior material to the lower flange 33 of the main body portion 30, the flange is not arranged by overlapping it with, for example, the flange of a reinforcing portion formed of an H-shaped steel on the lower flange 33 of the main body portion 30. Further, since the reinforcing portion 31 is open laterally, the desired member can be easily attached in the same fit as when attaching it to a general H-shaped steel beam without interference from the reinforcing portion 31.

[0034] The reinforcing beam 3 forms a main body protruding portion 37 at the end of the main body portion 30, where the end of the main body portion 30 protrudes longer in the longitudinal direction than the reinforcing portion 31. In the present embodiment, the main body protruding portions 37 are formed at both ends of the main body portion 30. By forming the main body protruding portions 37, the reinforcing portions 31 are not formed at both ends of the reinforcing beam 3, and the lower surface of the main body protruding portion 37 can abut against the upper end of the ramen column 4. A stiffener 38 is provided between the upper and lower flanges 32, 33 above the position where the stiffener 38 is joined to the ramen column 4 on the main body protruding portion 37 to reinforce the main body protruding portion 37. When a vertical load is applied to the reinforcing beam 3 provided with fulcrums at both ends, the displacement amount at the center in the longitudinal direction of the reinforcing beam 3 farthest from the fulcrum becomes the largest. However, the reinforcing portion 31 is arranged at the center of the reinforcing beam 3 to reinforce the lower surface of the main body portion 30. Even if the main body protruding portion 37 formed at the end of the reinforcing beam 3, which is a portion close to the fulcrum, is not reinforced by the reinforcing beam 3, it can be reinforced with sufficient strength.

[0035] The ramen column 4 includes a column main body 40 of H-shaped steel, a horizontal flat upper end plate 41 fixed to the upper end of the column main body 40, and a flat base plate 42 fixed to the lower end of the column main body 40. The base plate 42 is welded and fixed to the lower end of the column main body 40 and fixed to the anchor bolts protruding from the foundation 6 with double nuts to fix the lower end of the ramen column 4 to the foundation 6. The base plate 42 is formed in a rectangular flat plate shape with a size that can accommodate the entire H-shaped lower end surface of the column main body 40. In the present embodiment, the ramen column 4 is a column on the first floor of the building and is erected on the foundation 6. However, it is not limited to this. For example, although not shown in the figure, when the ramen column 4 is a column on the second floor or above, the base plate 42 of the ramen column 4 may be fixed to the upper flange of the beam installed in the ceiling cavity of the lower floor with bolts and nuts.

[0036] The upper end plate 41 is a horizontal flat plate and is welded to the upper end of the column body 40. As shown in FIGS. 3 and 4, the upper end plate 41 includes two flat plate portions 43 that are respectively fixed to the upper ends of the two flanges 46 of the column body 40 and extend horizontally, and a connection portion 44 that is formed with a width narrower than that of the two flat plate portions 43 along the width direction of the flange 46 of the column body 40 along the upper end of the web 47 of the column body 40 and connects the two flat plate portions 43. The upper end plate 41 is a steel plate with a thickness of, for example, 20 mm. The two flat plate portions 43 of the upper end plate 41 are substantially square with rounded corners, and the length of one side of the square constituting the flat plate portion 43 is, for example, 120 mm. Note that the shape of the flat plate portion 43 is not limited to a square, but it is preferably a shape that can be welded and horizontally fixed to the upper ends of one flange 46 and the web 47 of the column body 40, and a shape that can form two or more structural joining holes 45 described later. Four structural joining holes 45 are provided in each of the flat plate portions 43. The structural joining holes 45 are formed so as to be aligned with bolt insertion holes 39 formed in the lower flange 33 when the upper end plate 41 is brought into contact with the lower flange 33 of the main body portion 30 of the reinforcing beam 3. A joining bolt 7 is inserted into the structural joining holes 45 and the bolt insertion holes 39, and a joining nut 8 is fastened to rigidly join the reinforcing beam 3 to the ramen column 4. The connection portion 44 is formed, for example, with a length of 125 mm and a width of 25 mm, and connects between the two flat plate portions 43. The connection portion 44 is narrow enough to expose the exterior fixing hole 9 formed in the lower flange 33 without covering it when the upper end plate 41 is brought into contact with the lower surface of the lower flange 33 of the reinforcing beam 3.

[0037] Also, the total length from one flat plate portion 43 to the other flat plate portion 43 of the upper end plate 41 is, for example, 375 mm, and the length of the main body protruding portion 37 of the main body portion 30 of the reinforcing beam 3 is, for example, 402.5 mm. When the upper end plate 41 is fixed to the lower surface of the main body protruding portion 37, a horizontal gap 22 of 28.5 mm is formed between the upper end plate 41 and the reinforcing portion 31. If a gap 22 is formed between the upper end plate 41 and the reinforcing portion 31, it is easy to perform bolt connection between the upper end plate 41 and the main body portion 30 of the reinforcing beam 3, and it is also easy to wrap a fireproof coating material (not shown) around the reinforcing beam 3.

[0038] In the joint structure 1a between the beam and the column of the present embodiment, the entire upper surface of the upper end plate 41 of the ramen column 4 abuts against the lower surface of the main body protruding portion 37 of the reinforcing beam 3, and all the structural joint holes 45 formed in the two flat plate portions 43, four in each, are respectively aligned with the bolt insertion holes 39 formed in the lower flange 33 of the main body protruding portion 37 of the reinforcing beam 3. The upper end of the ramen column 4 and the reinforcing beam 3 are rigidly joined by the joining bolts 7 and the joining nuts 8 respectively. In this way, the entire upper end plate 41 abuts against the lower surface of the main body protruding portion 37 of the reinforcing beam 3, and the two flat plate portions 43 are fixed by the joining bolts 7 and the joining nuts 8, so that the end of the reinforcing beam 3 and the column head of the ramen column 4 can be rigidly joined with sufficient strength.

[0039] And in the joint structure 1a between the beam and the column of the present embodiment, since the main body portions 30 of both ends of the reinforcing beam 3 protrude more than the reinforcing portions 31 and the main body protruding portions 37 are formed, the main body protruding portions 37 at both ends of the reinforcing beam 3 are not reinforced by the reinforcing portions 31. And since the upper end plate 41 of the ramen column 4 is rigidly joined to the lower surface of the main body protruding portion 37 which is a portion not reinforced by the reinforcing portion 31 of the reinforcing beam 3, the balance between the strength of the reinforcing beam 3 and the strength of the ramen column 4 at the joint portion is good, and it is possible to prevent the occurrence of column collapse which is structurally disadvantageous.

[0040] In addition, in the joint structure 1a between the beam and the column in this embodiment, the upper ramen column 5 is also fixed to the upper flange 32 of the main body protruding portion 37 of the main body portion 30 of the reinforcing beam 3 and stands upright upward from the main body protruding portion 37. The joint structure 1a between the beam and the column is not limited to the configuration having such an upper ramen column 5.

[0041] In the beam frame structure 2a of this embodiment, the upper end plates 41 of the respective ramen columns 4 are brought into contact with and joined to the main body protruding portions 37 formed at both ends of the reinforcing beam 3, thereby forming a ramen frame in which both ends of the reinforcing beam 3 are rigidly joined to the ramen columns 4. By providing the joint structure 1a between the beam and the column of this embodiment at both ends of the reinforcing beam 3 in this way, and by installing the reinforcing beam 3 between the two ramen columns 4, while making both ends of the reinforcing beam 3 a strong portal ramen frame with beam overhang, the strength balance at the joint portion between the reinforcing beam 3 and the ramen column 4 is good, and a structure in which column collapse is less likely to occur can be achieved. Moreover, since the reinforcing beam 3 with beam overhang is directly rigidly joined to the ramen column 4, the beam frame structure 2a of this embodiment can bear both horizontal load resistance and vertical force, and there is no need to separately install a column member in the beam space between the two ramen columns 4, so the space can be utilized efficiently.

[0042] 〔Second Embodiment〕 Hereinafter, a second embodiment of the joint structures 1a and 1b between the beam and the column of the present invention and the beam frame structure 2b including the joint structures 1a and 1b between the beam and the column will be described with reference to FIGS. 5 to 8. Note that the same components as those in the joint structure 1a between the beam and the column and the beam frame structure 2a in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[0043] As shown in Fig. 5, the beam structure 2b in this embodiment is a portal ramen structure in which ramen columns 4 are erected at both ends of the reinforcing beam 3. One end of the reinforcing beam 3 and one ramen column 4 are joined with the same configuration as in the first embodiment, and the other end of the reinforcing beam 3 and the other ramen column 4 are joined by a beam-column joint structure 1b of a second embodiment different from that of the first embodiment. Therefore, the description of the beam-column joint structure 1a similar to that of the first embodiment is omitted, and the beam-column joint structure 1b of the second embodiment shown at the left end of the reinforcing beam 3 in Fig. 5 will be described.

[0044] The beam-column joint structure 1b of the second embodiment joins a reinforcing beam 3 having a horizontally long main body portion 30 and a reinforcing portion 31 fixed along the lower surface of the main body portion 30, and a ramen column 4 whose upper end is joined to the end of the reinforcing beam 3 to support the end of the reinforcing beam 3. The shape of the main body portion 30 of the reinforcing beam 3 is the same as that of the first embodiment. Also, the cross-sectional shape of the reinforcing portion 31 of the reinforcing beam 3 is the same as that of the first embodiment, which is a CT-shaped steel with an inverted T-shaped cross-section, and the cross-sectional dimensions are also the same as those of the first embodiment. The length of the reinforcing portion 31 is formed, for example, about 740 mm shorter than the length of the main body portion 30. In this embodiment, one end of the main body portion 30 protrudes about 400 mm longer than one end of the reinforcing portion 31 to form a main body protruding portion 37, and the other end of the main body portion 30 protrudes about 340 mm longer than the other end of the reinforcing portion 31 to form a main body protruding portion 37. Note that, similar to the first embodiment, the reinforcing portion 31 is not limited to CT-shaped steel.

[0045] Further, the ramen column 4 includes a column body 40 made of H-shaped steel, a horizontal flat upper end plate 41 fixed to the upper end of the column body 40, and a flat base plate 42 fixed to the lower end of the column body 40. The base plate 42 has the same configuration as that of the first embodiment. Also, the upper end plate 41 has the same configuration as that of the first embodiment and is formed with the same dimensions. The upper end plate 41 includes two flat plate portions 43 fixed to the upper ends of the two flanges 46 of the column body 40 and extending horizontally, and a connecting portion 44 formed narrower than the two flat plate portions 43 along the upper end of the web 47 of the column body 40 and connecting the two flat plate portions 43.

[0046] At one end of the reinforcing beam 3, since the main body protruding portion 37 is formed, similar to the first embodiment, the entire upper surface of the upper end plate 41 of the ramen column 4 abuts against the lower surface of the main body protruding portion 37 of the reinforcing beam 3. All the four structure joining holes 45 formed in each of the two flat plate portions 43 are respectively aligned with the bolt insertion holes 39 formed in the lower flange 33 of the main body protruding portion 37 of the reinforcing beam 3. The upper end of the ramen column 4 and the reinforcing beam 3 are rigidly joined by the joining bolts 7 and the joining nuts 8 respectively. Since this configuration is the same as that of the first embodiment, it is the configuration shown in FIGS. 2 to 4.

[0047] At the other end of the reinforcing beam 3, as shown in FIGS. 6 to 8, the lower surface of the main body protruding portion 37 of the reinforcing beam 3 abuts against one flat plate portion 43 of the upper end plate 41, and the four structure joining holes 45 formed in the one flat plate portion 43 are aligned with the bolt insertion holes 39 formed in the lower flange 33 of the main body protruding portion 37. The upper end of the ramen column 4 and the reinforcing beam 3 are rigidly joined by the joining bolts 7 and the joining nuts 8. And, on the other flat plate portion 43, an H-shaped steel beam 13 laid in a direction perpendicular to the reinforcing beam 3 is disposed on the other flat plate portion 43 of the upper end plate 41, and the lower flange of the beam 13 and the other flat plate portion 43 of the upper end plate 41 are bolted together.

[0048] A plurality of through holes 11 into which the beam connection bolts 10 can be inserted are provided in the web 35 of the main body protruding portion 37 at the other end of the reinforcing beam 3. Between the upper and lower flanges of the H-shaped steel beam 13 laid in a direction orthogonal to the reinforcing beam 3, and flush with the web 35 of the main body protruding portion 37, a stiffener 12 is provided, and through holes 11 are also formed in the stiffener 12. And a flat beam connection plate 14 is disposed across the web 35 of the main body protruding portion 37 and the stiffener 12 of the H-shaped steel beam 13. Connection holes 15 are formed in the beam connection plate 14 at positions corresponding to the through holes 11 formed in the web 35 and the stiffener 12, respectively. Then, by inserting the beam connection bolts 10 into the connection holes 15 and the through holes 11 and fastening nuts (not shown), the main body protruding portion 37 and the H-shaped steel beam 13 are connected to each other.

[0049] The reinforcing beam 3 is rigidly joined by the lower surface of the main body protruding portion 37 abutting against one flat plate portion 43 of the upper end plate 41 and being bolted. The H-shaped steel beam 13 laid in a direction orthogonal to the reinforcing beam 3 is bolted to the other flat plate portion 43 of the upper end plate 41, so that the load of the orthogonal beam 13 can also be received by the ramen column 4. Therefore, since there is no need to provide a separate column, the effective space under the beam can be expanded, and the beam 13 orthogonal to the reinforcing beam 3 can be arranged as needed. For example, when a cantilever eaves is projected in a direction orthogonal to the reinforcing beam 3, the orthogonal beam 13 can be used as a beam for supporting the eaves, and the degree of freedom in design can be increased. In FIG. 8, for the convenience of illustration, the beam 13 does not project in the lower right direction of the drawing, but the beam 13 may project from both sides of the position supported by the ramen column 4.

[0050] In addition, also in the joint structure 1b of the beam and the column of the second embodiment, at both ends of the reinforcing beam 3, the main body portion 30 protrudes more than the reinforcing portion 31 to form the main body protruding portion 37 and is not reinforced by the reinforcing portion 31. Since the upper end plate 41 of the ramen column 4 is rigidly joined to the lower surface of the main body protruding portion 37, the balance between the strength of the reinforcing beam 3 and the strength of the ramen column 4 is good at the joint portion, and it is possible to prevent the occurrence of column collapse, which is structurally disadvantageous.

[0051] Also, in the beam structure 2b of the second embodiment, since the upper end plates 41 of the respective ramen columns 4 are in contact with and joined to the main body protruding portions 37 formed at both ends of the reinforcing beam 3, while making both ends of the reinforcing beam 3 into a strong portal ramen structure with beam overhang, it is possible to form a structure in which column collapse is less likely to occur, and since there is no need to separately install column materials in the beam space below between the two ramen columns 4, the space can be utilized efficiently.

[0052] In the beam structure 2b of the present embodiment, one end of the reinforcing beam 3 and one ramen column 4 are joined with the same configuration as in the first embodiment, and the other end of the reinforcing beam 3 and the other ramen column 4 are joined by the beam-column joining structure 1b of the second embodiment different from the first embodiment. However, the configuration may be such that both ends of the reinforcing beam 3 are joined by the beam-column joining structure 1b of the second embodiment.

[0053] 〔Third Embodiment〕 Hereinafter, a third embodiment of the beam-column joining structures 1a and 1b of the present invention and the beam structures 2a, 2b, and 2c provided with the beam-column joining structures 1a and 1b will be described with reference to FIGS. 9 and 10. Note that the same reference numerals are given to the same configurations as the beam-column joining structures 1a and 1b and the beam structures 2a and 2b in the first embodiment or the second embodiment, and the description thereof is omitted.

[0054] As shown in FIG. 9, in the beam structure 2c in the third embodiment, a ramen column 4 is erected at one end of the reinforcing beam 3, the other end of the reinforcing beam 3 is cantilevered, and a support column 16 other than the ramen column 4 is erected between one end and the other end of the reinforcing beam 3 to support the vertical load of the reinforcing beam 3. Although not shown, a beam installed in a direction orthogonal to the reinforcing beam 3 may be fixed to the side surface of the reinforcing beam 3 to support the horizontal load applied to the reinforcing beam 3. Since the joining of one end of the reinforcing beam 3 and the ramen column 4 is joined with the same configuration as in the first embodiment, a specific description of the joining structure on one end side of the reinforcing beam 3 is omitted.

[0055] As shown in Fig. 10, the support column 16 is a steel square column 17. The lower end thereof is fixed to the anchor bolts of the foundation 6, and a cylindrical upper protruding portion 18 is formed at the upper end thereof. A rectangular flat beam connection plate 19 is formed at the upper end of the upper protruding portion 18. The beam connection plate 19 abuts against the flange 36 formed on the lower side of the reinforcing portion 31 of the reinforcing beam 3 and is connected by a fixing bolt 20 and a fixing nut 21.

[0056] According to the beam structure 2c in the third embodiment as described above, by joining one end of the reinforcing beam 3 with the joint structure 1a of the beam and the column similar to the first embodiment, while fixing one end of the reinforcing beam 3 to the ramen column 4 with the beam winning, by freely designing the structure for supporting the other end of the reinforcing beam 3, the degree of freedom in designing the space adjacent to the beam structure 2c can be increased.

[0057] Note that the configuration of the other end of the reinforcing beam 3 in the beam structure 2c is not limited to the above. Also, the joint structure of one end of the reinforcing beam 3 of the beam structure 2c is not limited to the joint structure 1a of the beam and the column similar to the first embodiment, and may be a joint structure similar to the joint structure 1b of the beam and the column of the second embodiment.

[0058] It goes without saying that the embodiments of the present invention are not limited to the above-described forms and can be appropriately changed without departing from the scope of the idea of the present invention.

[0059] <First Invention> The first invention of the present application is a joint structure of a beam and a column including a reinforcing beam having a horizontally long main body portion and a reinforcing portion fixed along the lower surface of the main body portion, and a ramen column having an end portion of the reinforcing beam joined to the upper end thereof and supporting the end portion of the reinforcing beam. The end portion of the reinforcing beam has a main body protruding portion formed such that the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, and the upper end of the ramen column abuts against the lower surface of the main body protruding portion and is rigidly joined.

[0060] According to this, since the reinforcing beam has a main body protruding portion at its end where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, the main body protruding portion is not reinforced by the reinforcing portion, and the upper end of the ramen column abuts against the lower surface of the main body protruding portion which is an unreinforced part and is rigidly joined. Thus, it is possible to have a ramen structure where the beam is reinforced and the beam is stronger than the column, while also making the structure less prone to column collapse. Also, since the main body protruding portion is directly and rigidly joined to the ramen column, the ramen column can receive the horizontal force and the vertical load of the reinforcing beam together, eliminating the need to separately install a column that only receives the load of the reinforcing beam. Therefore, compared to the case where a column separate from the ramen column is provided, the effective dimension of the space under the beam can be increased and cost reduction can be achieved.

[0061] <Second Invention> The second invention of the present application is the joint structure between the beam and the column of the first invention, wherein the main body portion is an H-shaped steel with flanges formed vertically, and the reinforcing portion is a CT-shaped steel with its web arranged upward and a flange formed on the lower side.

[0062] According to this, in addition to the effects of the first invention, since the main body portion is H-shaped steel and the reinforcing portion is CT-shaped steel with its web facing upward and a flange formed on the lower side, the reinforcing portion is open towards the side. Since the main body portion is the same H-shaped steel as a general beam, for example, when attaching a desired member such as an exterior material to the beam, it can be attached with the same fitting and the same joining members as in the case of attaching to a general beam, eliminating the need to design new parts for attaching the member and suppressing cost increases. In particular, when attaching a desired member to the lower flange of the main body portion, since the reinforcing portion is CT steel, the flange of the reinforcing portion is not arranged overlapping the lower flange of the main body portion, and since the reinforcing portion is open towards the side, the desired member can be easily attached with the conventional fitting without interference from the reinforcing portion.

[0063] <Third Invention> The third invention of the present application is the joint structure between the beam and the column of the first invention or the second invention, wherein the ramen column includes an H-shaped steel column body and a horizontal flat upper end plate fixed to the upper end of the column body.

[0064] According to this, in addition to the effects of the first invention or the second invention, since the ramen column includes a column body of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column body, the upper end plate can be easily attached by contacting the lower surface of the flange of the main body portion of the reinforcing beam.

[0065] <Fourth Invention> The fourth invention of the present application is a joint structure between a beam and a column according to any one of the first invention to the third invention, wherein the upper end plate is fixed to the upper ends of two flanges of the column body respectively and has two flat plate portions extending in the horizontal direction, and along the upper end of the web of the column body, a connecting portion is formed with a length narrower in the flange width direction of the column body than the two flat plate portions and connecting the two flat plate portions. The flat plate portion is formed with a structural joint hole for inserting a bolt for joining the flat plate portion to the lower flange of the main body portion of the reinforcing beam, and when the upper end plate is joined to the lower flange of the main body portion, an exterior fixing hole formed in the lower flange of the main body portion is exposed on the side of the connecting portion.

[0066] According to this, in addition to the effects of the first invention to the third invention, the upper end plate of the ramen column has two flat plate portions fixed to the upper ends of two flanges of the column body respectively and extending in the horizontal direction, and a connecting portion formed narrower than the two flat plate portions along the upper end of the web of the column body and connecting the two flat plate portions. A structural joint hole for joining the reinforcing beam and the ramen column is formed in the flat plate portion, and since the connecting portion is narrow, the lower flange of the main body portion of the reinforcing beam is exposed on the side of the connecting portion, and the exterior fixing hole formed in the lower flange is exposed. Therefore, the exterior member can be attached to the main body portion of the reinforcing column without interfering with the upper end plate.

[0067] <Fifth Invention> The fifth invention of the present application is a joint structure between a beam and a column according to any one of the first invention to the fourth invention, wherein the upper end plate and the reinforcing portion are arranged with a gap therebetween.

[0068] According to this, in addition to the effects of any one of the first to fourth inventions, since the upper end plate and the reinforcing portion are arranged with a gap therebetween, the bolt joining operation between the upper end plate and the main body portion of the reinforcing beam becomes easy to construct, and the operation of winding a fireproof coating material around the reinforcing beam is facilitated by the gap.

[0069] <Sixth Invention> The sixth invention of the present application is a joint structure between a beam and a column according to any one of the first to fifth inventions, wherein the lower surface of the main body protrusion of the reinforcing beam abuts against the entire upper surface of the upper end plate and is bolted to the two flat plate portions.

[0070] According to this, in addition to the effects of any one of the first to fifth inventions, since the lower surface of the main body protrusion of the reinforcing beam abuts against the entire upper surface of the upper end plate and is bolted to the two flat plate portions, the end of the reinforcing beam and the column head of the ramen column can be rigidly joined with sufficient strength, and the ramen column can sufficiently receive the vertical load and horizontal load resistance of the reinforcing beam.

[0071] <Seventh Invention> The seventh invention of the present application is a joint structure between a beam and a column according to any one of the first to fifth inventions, wherein the lower surface of the main body protrusion of the reinforcing beam abuts against one flat plate portion of the upper end plate and is bolted thereto, and a beam installed in a direction orthogonal to the reinforcing beam is bolted to the other flat plate portion of the upper end plate.

[0072] According to this, in addition to the effects of any one of the first to fifth inventions, the reinforcing beam is rigidly joined by the lower surface of the main body protrusion abutting against one flat plate portion of the upper end plate and being bolted thereto, and a beam installed in a direction orthogonal to the reinforcing beam is bolted to the other flat plate portion of the upper end plate, so that the load of the orthogonal beam can also be received by the ramen column, and there is no need to provide a separate column, so the effective space under the beam can be expanded. In addition, since a beam orthogonal to the reinforcing beam can be arranged as needed, for example, the degree of freedom in design can be increased when a cantilever eaves is projected in a direction orthogonal to the reinforcing beam.

[0073] <Eighth Invention> The eighth invention (first embodiment, second embodiment) of the present application is a beam frame structure, wherein both ends of the reinforcing beam protrude longer in the longitudinal direction than the reinforcing part at both ends thereof to form the main body protruding part, the ramen columns are erected at both ends of the reinforcing beam respectively, and at both ends of the reinforcing beam, the joint structure between the beam and the column according to any one of the first to seventh above is provided, and the reinforcing beam is erected between the two ramen columns.

[0074] According to this, since the joint structure between the beam and the column according to any one of the first to seventh above is provided at both ends of the reinforcing beam, and the reinforcing beam is erected between the two ramen columns, while making both ends of the reinforcing beam a strong gable frame structure with beam over column, a structure in which column collapse is unlikely to occur can be achieved. By rigidly joining the beam-over-column reinforcing beam directly to the ramen column, there is no need to install a column separate from the ramen column, and the beam space under the two ramen columns can be maximally and effectively utilized.

[0075] <Ninth Invention> The ninth invention (third embodiment) of the present application is a beam frame structure, wherein at least one end of the main body portion of the reinforcing beam protrudes longer in the longitudinal direction than the reinforcing part to form the main body protruding part, the ramen column is erected at at least one end of the reinforcing beam, and at one end of the reinforcing beam, the joint structure between the beam and the column according to any one of the first to seventh above is provided.

[0076] According to this, since the joint structure between the beam and the column according to any one of the first to seventh above is provided at one end of the reinforcing beam, while fixing one end of the reinforcing beam to the ramen column with beam over column, a structure in which column collapse is unlikely to occur can be achieved, and the structure for supporting the other end of the reinforcing beam can be freely designed, and the degree of freedom in designing the space adjacent to the beam frame structure can be increased.

Industrial Applicability

[0077] The joint structure between the beam and the column and the beam frame structure according to the present invention are suitable as the structural frame of a building with a heavy steel frame ramen structure.

Description of Symbols

[0078] 1a, 1b Joint structure of beam and column 2a, 2b, 2c Beam frame structure 3 Reinforcing beam 4 Ramen column 9 Exterior fixing hole 30 Body part 31 Reinforcing part 37 Body protruding part 40 Column body 41 Upper end plate 43 Flat plate part 44 Connection part 45 Structural joint hole

Claims

1. A reinforced beam having a horizontally long main body portion and a reinforcing portion fixed along the lower surface of the main body portion, and a ramen column having an end portion of the reinforced beam joined to an upper end thereof to support the end portion of the reinforced beam, wherein an end portion of the reinforced beam is formed with a main body protruding portion where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, an upper end of the ramen column abuts against a lower surface of the main body protruding portion and is rigidly joined, the ramen column includes a column main body of H-shaped steel and a horizontal flat upper end plate fixed to an upper end of the column main body, a joint structure between a beam and a column in which the upper end plate and the reinforcing portion are arranged with a gap therebetween.

2. The joint structure between a beam and a column according to claim 1, wherein the main body portion is H-shaped steel formed with flanges vertically, and the reinforcing portion is CT-shaped steel having a web arranged upward and a flange formed on a lower side.

3. The upper end plate has two flat plate portions fixed to upper ends of two flanges of the column main body and extending horizontally, and a connecting portion formed along an upper end of a web of the column main body and having a width narrower than a width of the flange of the column main body in a flange width direction of the column main body and connecting the two flat plate portions, the flat plate portion is formed with a structural joint hole for inserting a bolt for joining to a lower flange of the main body portion of the reinforced beam, and when the upper end plate is joined to the lower flange of the main body portion, an exterior fixing hole for fixing an exterior member of a building is formed in the lower flange of the main body portion, and at least one of the exterior fixing holes is exposed between the two upper end plates and at a position not covered by the connecting portion. The joint structure between a beam and a column according to claim 2.

4. The joint structure between a beam and a column according to claim 3, wherein the lower surface of the main body protruding portion of the reinforced beam abuts against an entire upper surface of the upper end plate and is bolted to the two flat plate portions.

5. A reinforced beam having a horizontally long main body portion and a reinforcing portion fixed along the lower surface of the main body portion, and a ramen column having an end portion of the reinforced beam joined to an upper end thereof to support the end portion of the reinforced beam, wherein an end portion of the reinforced beam is formed with a main body protruding portion where the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, an upper end of the ramen column abuts against a lower surface of the main body protruding portion and is rigidly joined, and the main body portion is H-shaped steel formed with flanges vertically. The reinforcing part is a CT-shaped steel with the web arranged upward and a flange formed on the lower side. The ramen column includes a column body of H-shaped steel and a horizontal flat upper-end plate fixed to the upper end of the column body. The upper-end plate has two flat plate portions respectively fixed to the upper ends of the two flanges of the column body and extending horizontally, and a connecting portion formed along the upper end of the web of the column body with a length in the flange width direction of the column body narrower than that of the two flat plate portions and connecting the two flat plate portions. The flat plate portion has a structural joining hole formed therein for inserting a bolt that joins to the lower flange of the main body portion of the reinforcing beam. The reinforcing beam has the lower surface of the main body protruding portion in contact with one flat plate portion of the upper-end plate and bolt-joined thereto. A joining structure of a beam and a column in which a beam laid in a direction orthogonal to the reinforcing beam is bolt-joined to the other flat plate portion of the upper-end plate.

6. When the upper-end plate is joined to the lower flange of the main body portion, an exterior fixing hole for fixing an exterior member of a building is formed in the lower flange of the main body portion, and at least one of the exterior fixing holes is exposed between the two upper-end plates and at a position not covered by the connecting portion. The beam-column joining structure according to claim 5.

7. The beam-column joining structure according to claim 6, wherein the upper-end plate and the reinforcing part are arranged with a gap therebetween.

8. The reinforcing beam has both ends of the main body portion protruding longer in the longitudinal direction than the reinforcing part to form the main body protruding portion. The ramen column is erected at both ends of the reinforcing beam respectively. At both ends of the reinforcing beam, the beam-column joining structure according to any one of claims 1 to 7 is provided. A beam structure in which the reinforcing beam is laid between two ramen columns.

9. The reinforcing beam has at least one end of the main body portion protruding longer in the longitudinal direction than the reinforcing part to form the main body protruding portion. The ramen column is erected at at least one end of the reinforcing beam. A beam structure in which the beam-column joining structure according to any one of claims 1 to 7 is provided at one end of the reinforcing beam.

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