Steel frame building structure

Abstract

To provide a steel-frame building structure that can improve the loading efficiency of steel beams onto the cargo bed of a vehicle. [Solution] The steel frame building structure 8 comprises a first H-shaped steel beam 1 in which gusset plates 12 are welded and fixed to the web 1W and upper and lower flanges 1H and 1L of the H-shaped steel in a manner that does not extend beyond the edges of the upper and lower flanges 1H and 1L of the H-shaped steel; a second H-shaped steel beam 2 in which end plates 21 fixed to the gusset plates 12 by bolts and nuts 4 are welded and fixed to the end of the H-shaped steel; and a pair of brace sheets 31 and 32 located on both sides of the web 2W of the second H-shaped steel beam 2, on the vertically central side of the web 1W of the first H-shaped steel beam 1, to which the ends of the horizontal braces 5 are connected.

Description

Technical Field

[0001] This invention relates to a steel building structure in which steel beams pre - joined by welding of members in a factory or the like are transported to a site and assembled.

Background Art

[0002] Patent Document 1 discloses a beam joining structure that can improve the conveyance efficiency to the site of H - shaped steel by welding each plate using an automatic welding line in a factory. In this beam joining structure, a first gusset plate is provided between the upper and lower flanges of a first beam (main beam) without protruding from the side edge of the flange, a second gusset plate is provided on the web of a second beam (sub - beam) so as to protrude to the side of the first gusset plate, and the first gusset plate and the second gusset plate are joined by a fastening member between the upper and lower flanges of the first beam (main beam).

[0003] Patent Document 2 discloses a construction method of a beam structure. In this construction method, a steel bracket is welded at a predetermined position on an H - shaped steel material in a factory or the like, and a steel brace receiving plate (brace sheet) is welded at a predetermined position on the H - shaped steel material to prepare a first beam. Also, in a factory or the like, a through - hole through which a bolt for fixing a second beam to the first beam can be inserted is formed at a predetermined position on the H - shaped steel material to prepare a second beam. Next, the first beam and the second beam are transported from a factory or the like to a construction site. Also, braces, cover members, etc. are transported from a factory or the like to a construction site.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above-mentioned conventional technology, if the H-shaped steel beams transported from a factory or the like to a construction site are equipped with brace support plates that protrude from the edges of the upper and lower flanges of the H-shaped steel beam, the efficiency of loading onto the vehicle's cargo bed decreases, resulting in higher transportation costs.

[0006] In view of the above circumstances, this invention aims to provide a steel-framed building structure that can improve the loading efficiency of steel beams onto the cargo bed of a vehicle. [Means for solving the problem]

[0007] The steel frame building structure according to this invention is characterized in that, in order to solve the above problems, it comprises: a first steel beam in which gusset plates are welded and fixed to the web and upper and lower flanges of the steel section in a manner that does not extend beyond the edges of the upper and lower flanges of the steel section; a second steel beam in which end plates fixed to the gusset plates by fastening members are welded and fixed to the ends of the steel section; and a pair of brace sheets in which the ends of horizontal braces are connected on both sides of the web of the second steel beam, located on the vertically central side of the web of the first steel beam.

[0008] With the above configuration, the first steel beam has the gusset plate welded to it in a way that it does not protrude from the edges of its upper and lower flanges, so it can be efficiently loaded onto a truck in this welded state. Also, although the second steel beam is lengthened by the end plate, there is no protrusion at any point along its length, so it can be efficiently loaded onto a truck in this welded state. Furthermore, a steel building structure with this configuration includes a pair of brace sheets located on the vertical center side of the web of the first steel beam, making it easy to avoid the horizontal brace interfering with the ceiling structure on the floor below.

[0009] One of the pair of brace sheets described above, the first steel beam side fixed brace sheet, is positioned so as not to protrude from the edges of the upper and lower flanges of the first steel beam and may be welded to the gusset plate and the web of the first steel beam. This allows the first steel beam to be efficiently loaded onto the cargo bed of a vehicle, even though it has a structure that includes the first steel beam side fixed brace sheet.

[0010] The end plate has an L-shaped configuration, comprising a flat fixed surface portion which is welded and fixed to the web of the second steel beam and also fixed by the fastening member, and a facing portion which faces the web of the first steel beam. The second steel beam side fixed brace sheet, which is the other of the pair of brace sheets, may be welded to the fixed surface portion and the facing portion of the end plate. This configuration allows the second steel beam to be efficiently loaded onto the cargo bed of a vehicle, even though it has a structure that includes the second steel beam side fixed brace sheet.

[0011] The second steel beam side fixing brace sheet extends to the point where it intersects with the web of the second steel beam on the fixing surface, and this extended portion may also be welded to the fixing surface.

[0012] The end plate has a U-shape comprising a fixing plate portion welded to the upper and lower flanges and the web of the second steel beam at the end of the second steel beam, a fastening plate portion fixed to the gusset plate by the fastening member, and a facing portion facing the web of the first steel beam. The second steel beam side fixing brace sheet, which is the other of the pair of brace sheets, may be welded to the fastening plate portion and the facing portion of the end plate. This allows the second steel beam to be efficiently loaded onto the cargo bed of a vehicle, even though it has a structure that includes the second steel beam side fixing brace sheet. Furthermore, since the end plate is U-shaped, it is possible to maintain a similar level of strength while making its plate thickness thinner than that of an L-shaped end plate.

[0013] A recess is formed on the central side in the height direction of the fixing plate portion, and the second steel beam side fixing brace sheet may pass through the recess and reach the web of the second steel beam and be welded to the web as well.

[0014] The end plate has an L-shaped fixed plate portion that is welded and fixed to the upper and lower flanges and the web of the second steel beam at the end side of the second steel beam, and a fastening plate portion that is fixed to the gusset plate by the fastening member. The pair of brace sheets may be welded and fixed to the second steel beam side, positioned outside the edges of the upper and lower flanges of the first steel beam and not extending beyond the edges of the upper and lower flanges of the second steel beam. In this configuration, the first steel beam does not have brace sheets and can be efficiently loaded onto the vehicle's cargo bed. On the other hand, the second steel beam has a structure with the pair of brace sheets and can be efficiently loaded onto the vehicle's cargo bed.

[0015] In the configuration in which the first steel beam does not have a brace sheet, a first beam side reinforcing plate is welded and fixed to the gusset plate and the web of the first steel beam in such a manner that it does not extend beyond the edges of the upper and lower flanges of the first steel beam and is located on the vertically central side of the web of the first steel beam, and one of the pair of brace sheets may be welded and fixed to the web of the second steel beam and positioned abutting against the edge of the first beam side reinforcing plate.

[0016] One of the pair of brace sheets described above may also be welded to the base side of the fastening plate portion.

[0017] The other of the pair of brace sheets may be welded to the fixing plate portion and the web of the second steel beam.

[0018] A second beam-side reinforcing plate may be provided, which is welded and fixed to the fixing plate portion and the fastening plate portion at the height where the other of the pair of brace sheets described above is located. [Effects of the Invention]

[0019] According to the present invention, it is possible to improve the loading efficiency on the vehicle bed in the steel beam constituting the steel frame building structure. Further, since a pair of brace sheets are provided on the central side in the vertical direction of the web of the steel beam, there is an effect that it becomes easy to avoid interference between the horizontal brace and the ceiling structure on the lower floor side.

Brief Description of Drawings

[0020] [Figure 1] It is a figure which shows the steel frame building structure of embodiment, FIG. (A) is a perspective view from the direction where the first H-shaped steel beam side fixed brace sheet is visually recognized, and FIG. (B) is a perspective view from the direction where the second H-shaped steel beam side fixed brace sheet is visually recognized. [Figure 2] FIG. (A) and FIG. (B) are perspective views showing the first H-shaped steel beam (main beam) in the embodiment. [Figure 3] It is a perspective view showing the second H-shaped steel beam (secondary beam) in the embodiment. [Figure 4] FIG. (A) and FIG. (B) are perspective views showing the joining of the first H-shaped steel beam and the second H-shaped steel beam in the embodiment. [Figure 5] FIG. (A) and FIG. (B) are perspective views showing the joining of the first H-shaped steel beam and the second H-shaped steel beam in another embodiment, decomposed. [Figure 6] FIG. (A) and FIG. (B) are perspective views showing the joining of the first H-shaped steel beam and the second H-shaped steel beam in another embodiment. [Figure 7] FIG. (A) and FIG. (B) are perspective views showing the second H-shaped steel beam (secondary beam) in another embodiment shown in FIG. 6.

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. As shown in FIG. 1, the steel frame building structure 8 includes a first H-shaped steel beam 1 (main beam), a second H-shaped steel beam 2 (secondary beam) arranged orthogonally to the first H-shaped steel beam 1 and having, for example, a smaller width but the same height as the first H-shaped steel beam 1, and a pair of brace sheets 31 and 32 to which the ends of the horizontal brace 5 are connected.

[0022] As shown in Figures 2(A) and 2(B), the first H-shaped steel beam 1 has a structure in which a rectangular steel plate gusset plate 12 is welded to the web 1W and the upper and lower flanges 1H and 1L by fillet welding or the same method (hereinafter the same), so as not to protrude from the edges of the upper flange 1H and lower flange 1L. The gusset plate 12 has two or more through holes through which bolts of bolts and nuts 4 (fastening members) are inserted. In configurations with three or more of the above-mentioned through holes, it is desirable that the through holes on the side closer to the brace sheets 31 and 32 be as close to the brace sheets 31 and 32 as possible. In this case, the position of the above-mentioned through holes should be set so that the tightening tools for the bolts and nuts that fix the brace sheets 31 and 32 do not interfere with the bolts and nuts 4.

[0023] As shown in Figure 3, the second H-shaped steel beam 2 has a structure in which the end plate 21 is welded and fixed to the end of the web 2W. The end plate 21 is made of steel plate and is fixed to the gusset plate 12 by bolts and nuts 4.

[0024] Furthermore, as shown in Figures 4(A) and 4(B), the end plate 21 has an L-shaped configuration, comprising a flat fixing surface portion 21a that is welded and fixed to the web 2W of the second H-shaped steel beam 2, and a facing portion 21b that faces the web 1W of the first H-shaped steel beam 1, and which protrudes from the end of the H-shaped steel in the second H-shaped steel beam 2 and is fixed to the gusset plate 12 by bolts and nuts 4.

[0025] Furthermore, the end plate 21 has a roughly T-shape because the width of the portion fixed by the bolts and nuts 4 is wider than the width of the portion welded to the web 2W of the second H-shaped steel beam 2. The protruding width of the portion fixed by the bolts and nuts 4 is approximately half the width of the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1, and two or more holes for inserting the bolts of the bolts and nuts 4 are formed in this portion, corresponding to the positions of the insertion holes on the gusset plate 12 side. In addition, the width of the opposite portion 21b is approximately half the width of the upper and lower flanges 2H and 2L of the second H-shaped steel beam 2.

[0026] A pair of brace sheets 31 and 32 are positioned on both sides of the web 2W of the second H-shaped steel beam 2, on the vertically central side of the web 1W of the first H-shaped steel beam 1. Through holes are formed in the brace sheets 31 and 32, and the horizontal brace 5 is connected by bolts and nuts passed through these through holes. The distance between the center position of the through holes in the brace sheets 31 and 32 and the web 1W of the first H-shaped steel beam 1 does not have to be the same.

[0027] One of the brace sheets 31, the first H-shaped steel beam side fixed brace sheet 31, is made of steel plate and is fitted so as not to protrude from the edges of the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1. Two orthogonal sides of the brace sheet 31 are welded to the gusset plate 12 and the web 1W of the first H-shaped steel beam 1. The first H-shaped steel beam 1 is manufactured by welding the gusset plate 12 and the first H-shaped steel beam side fixed brace sheet 31 to the H-shaped steel at a factory or the like, and this first H-shaped steel beam 1 is loaded onto the back of a vehicle and transported to the site.

[0028] The other brace sheet 32, the second H-shaped steel beam side fixed brace sheet 32, is made of steel plate and has the same width as the opposite portion 21b, and two orthogonal sides of the brace sheet 32 ​​are welded and fixed to the opposite portion 21b and the fixed surface portion 21a. The second H-shaped steel beam side fixed brace sheet 32 ​​does not have to extend to the point where it intersects (overlaps) with the web 2W of the second H-shaped steel beam 2 on the fixed surface portion 21a, but it is desirable to extend it and have the extended portion welded and fixed to the fixed surface portion 21a in order to improve the out-of-plane strength of the fixed surface portion 21a of the end plate 21 against the tension of the horizontal brace 5. The second H-shaped steel beam 2 is also manufactured in a factory or the like by welding the end plate 21 with the second H-shaped steel beam side fixed brace sheet 32 ​​attached to the H-shaped steel, and this second H-shaped steel beam 2 is loaded onto the back of a vehicle and transported to the site.

[0029] In the steel frame building structure 8 described above, the first H-shaped steel beam 1 has gusset plates 12 welded to it in a manner that does not extend beyond the edges of its upper and lower flanges 1H and 1L, allowing it to be efficiently loaded onto the vehicle's cargo bed in this welded and fixed state.

[0030] Although the overall length of the second H-shaped steel beam 2 is increased by the welded end plates 21, no protrusions are created at intermediate points along its length, allowing it to be efficiently loaded onto the vehicle's cargo bed in this welded and fixed state. Furthermore, the inclusion of L-shaped end plates 21 in the second H-shaped steel beam 2 makes it easier to determine the direction of connection to the first H-shaped steel beam 1, thus preventing construction errors.

[0031] Furthermore, in the steel frame building structure 8 with this configuration, the first H-shaped steel beam side fixed brace sheet 31 and the second H-shaped steel beam side fixed brace sheet 32 ​​are provided at the vertical center position of the web 1W of the first H-shaped steel beam 1. This allows the tensile force of the horizontal brace 5 to be received at the vertical center position of the web 1W, and also makes it easier to avoid the horizontal brace 5 interfering with the ceiling structure on the floor below.

[0032] If the first H-shaped steel beam side fixing brace sheet 31 is welded and fixed in such a manner that it does not protrude from the edges of the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1, then the first H-shaped steel beam 1 can be efficiently loaded onto the cargo bed of a vehicle, even though it has a structure that includes the first H-shaped steel beam side fixing brace sheet 31.

[0033] If the second H-shaped steel beam side fixing brace sheet 32 ​​is welded to the fixing surface portion 21a and the opposing portion 21b of the end plate 21, then the first H-shaped steel beam 1 will have a first H-shaped steel beam side fixing brace sheet 31, and the second H-shaped steel beam 2 will have a second H-shaped steel beam side fixing brace sheet 32.

[0034] Furthermore, if the opposite portion 21b of the L-shaped end plate 21 is spaced a certain distance from the web 1W of the first H-shaped steel beam 1, the attachment of the end plate 21 of the second H-shaped steel beam 2 to the web 1W of the first H-shaped steel beam 1 becomes easier. On the other hand, if the opposite portion 21b is brought close to and in close contact with the web 1W, the strength of the joint between the first H-shaped steel beam 1 and the second H-shaped steel beam 2 can be improved.

[0035] Figures 5(A) and 5(B) show a modified steel building structure 8A according to the above embodiment. Similar to steel building structure 8, this steel building structure 8A has a structure in which a rectangular steel plate gusset plate 12 is welded and fixed to the web 1W of the H-beam and the upper and lower flanges 1H and 1L of the first H-beam 1, so as not to protrude from the edges of the upper flange 1H and lower flange 1L. In this way, since the gusset plate 12 is welded and fixed to the first H-beam 1 so as not to protrude from the edges of the upper and lower flanges 1H and 1L, it can be efficiently loaded onto the cargo bed of a vehicle in this welded and fixed state.

[0036] On the other hand, an end plate 21A is joined to the end of the second H-shaped steel beam 2 so as to protrude from that end. This end plate 21A has a face portion 21b that faces the web 1W of the first H-shaped steel beam 1, a fixing plate portion 21c, and a fastening plate portion 21d, and is a U-shaped member with the face portion 21b and the fixing plate portion 21c facing each other. The fixing plate portion 21c is welded and fixed to the upper and lower flanges 2H, 2L and the web 1W of the second H-shaped steel beam 2 at the end side of the second H-shaped steel beam 2. The fastening plate portion 21d is fixed to the gusset plate 12 by bolts and nuts 4.

[0037] The second H-shaped steel beam side fixing brace sheet 32 ​​is welded to the fixing plate portion 21c and the opposite portion 21b of the end plate 21A. Furthermore, a recess is formed on the height-direction center side of the fixing plate portion 21c, and the second H-shaped steel beam side fixing brace sheet 32 ​​passes through this recess to the web 2W of the second H-shaped steel beam 2 (overlapping with it) and is welded to the web 2W as well. Although the overall length of the second H-shaped steel beam 2 is increased by the end plate 21A, there are no protrusions at intermediate positions in the length direction, so it can be efficiently loaded onto the cargo bed of a vehicle in this welded and fixed state.

[0038] Furthermore, since the end plate 21A is a U-shaped member, and the fixing plate portion 21c and the opposing portion 21b are positioned as ribs on both sides of the bolt and nut 4 attached to the fastening plate portion 21d, it is possible to maintain a similar level of strength even if the plate thickness is thinner than that of the aforementioned end plate 21. In addition, if the second H-shaped steel beam side fixing brace sheet 32 ​​is also welded and fixed to the web 2W of the second H-shaped steel beam 2, the joint strength of the end plate 21A against the tension of the horizontal brace 5 will be improved.

[0039] A modified example of the above embodiment, a steel frame building structure 8B, is shown in Figures 6(A) and 6(B). In this steel frame building structure 8B, an end plate 21B is joined to the end of the second H-shaped steel beam 2 so as to protrude from the end. This end plate 21B is provided with a fixing plate portion 21c and a fastening plate portion 21d in an L-shape.

[0040] As shown in Figures 7(A) and 7(B), the fixing plate portion 21c is welded and fixed to the upper and lower flanges 2H, 2L and web 2W of the second H-shaped steel beam 2 at the end of the second H-shaped steel beam 2. The width of the fixing plate portion 21c is approximately half the width of the upper and lower flanges 2H, 2L of the second H-shaped steel beam 2.

[0041] The fastening plate portion 21d is fixed to the gusset plate 12 by bolts and nuts 4. The width of the fastening plate portion 21d is approximately half the width of the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1.

[0042] The pair of brace sheets 33 and 34 are located outside the edges of the upper and lower flanges 1H and 1L of the first H-shaped steel beam 1 and are welded to the second H-shaped steel beam 2 at the same height.

[0043] Furthermore, the first H-shaped steel beam 1 has a first beam-side reinforcing plate 15. This first beam-side reinforcing plate 15 is positioned so as not to protrude from the edges of the upper and lower flanges 1H and 1L, and is located on the vertically central side of the web 1W of the first H-shaped steel beam 1. Two orthogonal sides of the first beam-side reinforcing plate 15 are welded and fixed to the gusset plate 12 and the web 1W of the first H-shaped steel beam 1. The first H-shaped steel beam 1 has the gusset plate 12 and the first beam-side reinforcing plate 15 welded and fixed so as not to protrude from the edges of its upper and lower flanges 1H and 1L, and in this welded and fixed state, it can be efficiently loaded onto the cargo bed of a vehicle.

[0044] One of the brace sheets 33 is welded to the web 2W of the second H-shaped steel beam 2 and is positioned abutting against the edge of the first beam-side reinforcing plate 15. The brace sheet 33 is also welded to the base side of the fastening plate portion 21d. The brace sheet 33 is a plate that does not protrude from the edges of the upper and lower flanges 2H and 2L of the second H-shaped steel beam 2.

[0045] The other brace sheet 34 is welded to the fixing plate portion 21c and the web 2W of the second H-shaped steel beam 2. The other brace sheet 34 is a plate with a width that does not extend beyond the edges of the upper and lower flanges 2H and 2L of the second H-shaped steel beam 2. The second H-shaped steel beam 2 also has a second beam side reinforcing plate 16. At the height where the other brace sheet 34 is located, two orthogonal sides of the second beam side reinforcing plate 16 are welded to the fixing plate portion 21c and the fastening plate portion 21d.

[0046] Although the overall length of the second H-shaped steel beam 2 is increased by the end plate 21B, no protrusions are created in the middle of its length, so it can be efficiently loaded onto the truck bed in this welded and fixed state. Furthermore, although the second H-shaped steel beam 2 has brace sheets 33 and 34, the end plate 21 and brace sheets 33 and 34 do not protrude from the edges of the upper and lower flanges 2H and 2L of the second H-shaped steel beam 2, so it can be efficiently loaded onto the truck bed of the vehicle in this welded and fixed state.

[0047] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the scope of equivalents. [Explanation of Symbols]

[0048] 1:First H-shaped steel beam 1H: Upper flange 1L: Lower flange 1W: Web 2:Second H-shaped steel beam 2H: Upper and lower flanges 2L: Upper and lower flanges 2W: Web 4: Nut 5: Horizontal brace 8: Steel frame building structure 8A: Steel frame building structure 8B: Steel frame building structure 12: Gusset Plate 15: First beam side reinforcement plate 16:Second beam side reinforcement plate 21: End plate 21A: End plate 21B: End plate 21a: Fixed surface part 21b: Face-to-face section 21c: Fixed plate part 21d: Fastening plate portion 31: First H-shaped steel beam side fixed brace sheet (one of the brace sheets) 32: Second H-shaped steel beam side fixed brace sheet (other brace sheet) 33: One of the brace sheets 34: The other brace sheet

Claims

1. A steel frame building structure characterized by comprising: a first steel beam in which gusset plates are welded and fixed to the web and upper and lower flanges of the structural steel in a manner that does not extend beyond the edges of the upper and lower flanges of the structural steel; a second steel beam in which end plates fixed to the gusset plates by fastening members are welded and fixed to the ends of the structural steel; and a pair of brace sheets located on both sides of the web of the second steel beam, on the vertically central side of the web of the first steel beam, to which the ends of horizontal braces are connected.

2. The steel frame building structure according to claim 1, wherein the first steel beam side fixed brace sheet, which is one of the pair of brace sheets, is positioned so as not to protrude from the edges of the upper and lower flanges of the first steel beam, and is welded and fixed to the gusset plate and the web of the first steel beam.

3. The steel frame building structure according to claim 1, wherein the end plate has an L-shaped portion which is a flat fixed surface portion which is welded and fixed to the web of the second steel beam and is fixed by the fastening member, and a facing portion which is facing the web of the first steel beam, and the second steel beam side fixed brace sheet which is the other of the pair of brace sheets is welded and fixed to the fixed surface portion and the facing portion of the end plate.

4. The steel frame building structure according to claim 3, characterized in that the second steel beam side fixing brace sheet extends on the fixing surface to a point where it intersects with the web of the second steel beam, and the extended portion is also welded and fixed to the fixing surface.

5. The steel frame building structure according to claim 1, wherein the end plate has in a U-shape a fixing plate portion welded and fixed to the upper and lower flanges and the web of the second steel beam at the end side of the second steel beam, a fastening plate portion fixed to the gusset plate by the fastening member, and a facing portion facing the web of the first steel beam, and the second steel beam side fixing brace sheet, which is the other of the pair of brace sheets, is welded and fixed to the fastening plate portion and the facing portion of the end plate.

6. The steel frame building structure according to claim 5, wherein a recess is formed on the height-direction center side of the fixing plate portion, and the second steel beam side fixing brace sheet passes through the recess and reaches the web of the second steel beam, and is welded and fixed to the web as well.

7. The steel frame building structure according to claim 1, wherein the end plate has in an L shape a fixing plate portion which is welded and fixed to the upper and lower flanges and the web of the second steel beam at the end side of the second steel beam, and a fastening plate portion which is fixed to the gusset plate by the fastening member, and the pair of brace sheets are welded and fixed to the second steel beam side, positioned outside the edges of the upper and lower flanges of the first steel beam and not extending beyond the edges of the upper and lower flanges of the second steel beam.

8. The steel frame building structure according to claim 7, wherein a first beam side reinforcing plate is welded and fixed to the gusset plate and the web of the first steel beam in such a manner that it does not extend beyond the edges of the upper and lower flanges of the first steel beam and is located on the vertically central side of the web of the first steel beam, and one of the pair of brace sheets is welded and fixed to the web of the second steel beam and is located abutting against the edge of the first beam side reinforcing plate.

9. The steel frame building structure according to claim 8, characterized in that one of the pair of brace sheets is also welded and fixed to the base side of the fastening plate portion.

10. The steel frame building structure according to claim 8, characterized in that the other of the pair of brace sheets is welded and fixed to the fixing plate portion and the web of the second steel beam.

11. A steel frame building structure according to claim 10, characterized in that it comprises a second beam-side reinforcing plate welded to the fixing plate portion and the fastening plate portion at the height where the other of the pair of brace sheets is located.

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