Earthquake-resistant M-shaped steel frame for first floor

Abstract

To provide an earthquake-proof frame formed in a compact size.SOLUTION: An earthquake-proof frame is formed by welding and connecting a first steel column 9 and a second steel column 10, which are formed of square steel tubes having the same shape and disposed in parallel, to both ends of four braces 24, 25, 26, 27 formed of square steel tubes into an M shape to a top end plate for fixing brace 19, a vertical center plate for fixing brace 20, and a bottom end plate for fixing brace 21, which are welded and connected to the first steel column 9, and to the upper plate for fixing brace 22 and the lower plate for fixing brace 23, which are welded and connected to the second steel column 10 located to face the first steel column.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] This invention relates to an earthquake-resistant frame for installation on the first floor of a steel frame structure. [Background technology]

[0002] The framework used in steel-frame construction is primarily made up of steel columns and beams, with braces and trusses added as needed to strengthen earthquake resistance.

[0003] Braces and trusses are used to reinforce steel structures, and reinforcing materials such as braces and trusses are widely used in buildings that require high earthquake resistance.

[0004] Conventionally, for braces installed in an area surrounded by the upper and lower beams of a steel frame structure and two steel columns, X-shaped earthquake-resistant frames have been used, in which both ends of the brace are connected to gusset plates welded to the opposing sides of the two columns (the top of one column and the bottom of the other) with high-strength bolts to secure them in an X shape, and K-shaped earthquake-resistant frames have been used, in which two braces within the frame are arranged in a K shape. Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of the X-shaped earthquake-resistant frame, braces (generally made from round bars or flat steel plates) are arranged in an X shape between two columns, so if you want to create an opening such as a window or entrance between the two columns, there are restrictions on the location and size of the window or entrance.

[0006] Furthermore, the diameter of the pilot holes for the high-strength bolts formed in the gusset plates and braces has traditionally required a high level of precision, approximately 1mm larger than the bolt diameter, to minimize play between the brace and gusset plate. As a result, the process of accurately welding the gusset plates to the side of the columns requires skilled techniques and time, which has led to problems such as increased time and costs.

[0007] Furthermore, in the case of the K-type earthquake-resistant frame, the fixing points of the two braces are limited to the upper and lower ends of one column and the center of the other column, which creates the problem that in order to increase earthquake resistance, the spacing between the left and right frames must be made wider or sturdy brace members must be used.

[0008] This invention was made in consideration of the above problems, and aims to manufacture high-precision earthquake-resistant frames by producing them in a factory using jigs, and to provide an earthquake-resistant frame that is narrow and compact in width so that openings such as windows and doorways in steel-framed structures can be made wide and large.

[0009] Furthermore, the objective of this invention is to provide a compact and strong earthquake-resistant frame by sandwiching braces made of square steel pipes between two plates welded to the opposing side surfaces of two left and right columns.

[0010] Furthermore, the objective is to provide an earthquake-resistant frame that is strong and has very little deformation by welding the flange surface of the lower beam frame formed from H-shaped steel to the lower ends of the two left and right columns. [Means for solving the problem]

[0011] In order to solve this problem, the invention described in claim 1 provides an earthquake-resistant frame for earthquake-reinforcement of a steel-frame building, which comprises a first steel column (9) and a second steel column (10) each made of two square steel pipes formed in the same shape, each 100 mm on a side, 4.5 mm thick, and 1926 mm long, and arranged parallel to each other at an interval of 700 mm; The aforementioneda lower beam frame (28) welded to both ends of the upper surface of a flange formed from an H-shaped steel beam having a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, a web thickness of 5.5 mm, and a length of 900 mm; and an upper end end plate (36) welded to the upper end (A) (68) of the steel column at the upper end of the first steel column (9), the upper end plate (36) being a square flat steel plate having a side dimension of 100 mm and a thickness of 9 mm, with four bolt holes (37) formed in a square shape, and four beam fixing nuts (70) welded to the steel column mounting surface (A) (67) on the underside of the four bolt holes (37); The beam fixing plate (31) is a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a thickness of 9 mm, and has four bolt holes (38) formed at the four corners. The plate is welded to the upper end of the steel column upper end (B) (75) at the top end of the second steel column (10). The upper end of the first brace (24) is sandwiched and welded to the upper end of the plate mounting surface (A) (33) of the first steel column (9). The brace fixing upper end plate (19) is made of a rectangular plate with a thickness of 6 mm, and has a side (A) (95) of 81 mm and a side (B) (96). The dimension of the upper end plate (19) for fixing the brace is 99 mm, the dimension of the side (C) (97) is 70 mm, the dimension of the steel column attachment part (98) is 140 mm, the angle (A) where the side (A) (95) and the side (B) (96) intersect is 240 degrees, the angle (B) where the side (B) (96) and the side (C) (97) intersect is 90 degrees, the angle (B) where the steel column attachment part (98) intersects with the side (A) (95) is 300 degrees, and the angle (B) where the steel column attachment part (98) intersects with the side (A) (95) is 300 degrees. The overlap width (A) (130) of the first brace 24 is 12 mm. Similarly, the overlap width (B) (131) of the side (CC) (182) of the first brace 24 is 58 mm. Furthermore, the ends of the second brace 25 and the third brace 26 are overlapped and welded together in a sandwich-like manner at the top and bottom central portions on the center line of the plate mounting surface (A) (33). The side (E) (99) of the upper and lower central plate (20) for fixing the braces, made of a 6 mm thick rectangular plate, is 70 mm.The side (F) (100) dimension is 230 mm, the side (G) (101) dimension is 70 mm, and the steel column attachment part (102) dimension is 230 mm. The side (FF) (185) of the second brace (25) is abutted so as to contact the tip where the side (E) (99) and the side (F) (100) of the two identically shaped upper and lower central plates (20) for fixing the brace intersect, and the side (FF) (185) of the second brace (25) is overlapped and welded so as to sandwich the two upper and lower central plates (20) for fixing the brace in a sandwich shape. The overlap width (C) (132 ) dimension is 61 mm, and similarly, the overlap width (D) (133) of the overlapping part of the edge (GG) (186) is formed to a dimension of 12 mm so that it will be sandwiched and welded together, and then the edge (KK) (190) of the third brace (26) is abutted so that it comes into contact with the tip where the edge (F) (100) and the edge (G) (101) of the two upper and lower central plates (20) for fixing the braces intersect, and the edge (KK) (190) of the third brace (26) is overlapped and welded together so that it is sandwiched between the two upper and lower central plates (20) for fixing the braces. The overlap width (F) (135) of the mating part is formed to a dimension of 61 mm, and similarly, the overlap width (E) (134) of the overlapping part side (JJ) (189) is formed to a dimension of 12 mm to sandwich and weld the end of the fourth brace (27) to the lower end on the center line of the plate mounting surface (A) (33) so that it is sandwiched and welded. Furthermore, the dimension of the side (I) (103) of the brace fixing lower end plate (21) formed from a rectangular plate with a thickness of 6 mm is 70 mm, and the dimension of the side (J) (104) is 12 mm. The side (NN) (193) of the fourth brace (27) is abutted against the tip where the sides (I) (103) and (J) (104) of the two identical brace fixing lower end plates (21) intersect, with the side (K) (105) measuring 70 mm and the steel column mounting portion (106) measuring 110 mm. The fourth brace (27) is sandwiched between the two brace fixing lower end plates (21) and welded together, so the overlap width (G) (136) of the overlapping portion of the side (NN) (193) is 62 mm. Similarly,The two brace fixing lower end plates (21) have an overlap width (H) (137) of 12 mm on the side (OO) (194) of the overlapping portion to sandwich and weld the ends of the first brace (24) and the second brace (25) together, and the upper brace fixing plate (22) is made of a rectangular plate with a thickness of 6 mm. The side (M) (107) of the upper brace fixing plate (22) is 70 mm and the side (P) of the upper brace fixing plate (22) is 6 mm thick and is welded to the center line of the plate mounting surface (B) (32) of the second steel column (10) at a position one-quarter of the way from the top end to sandwich and weld the ends of the first brace (24) and the second brace (25). The dimension of (110) is 230 mm, the dimension of the side (O) (109) is 70 mm, and the dimension of the steel column attachment part (108) is 230 mm. The side (BB) (181) of the first brace (24) is abutted so as to contact the tip where the side (M) (107) and the side (P) (110) of the two brace fixing upper plates (22) intersect, and the overlap width (I) (138) of the part where the side (BB) (181) of the first brace (24) is overlapped and welded so as to sandwich the two brace fixing upper plates (22) in a sandwich shape is formed with a dimension of 58 mm. The overlap width (J) (139) of the edge (CC) (182) of the first brace (24) is formed to a dimension of 12 mm, and the edge (GG) (186) of the second brace (25) is abutted so as to contact the tip where the edge (P) (110) and the edge (O) (109) of the two brace fixing upper plates (22) intersect, and the overlap width (L) (141) of the part where the edge (GG) (186) of the second brace (25) is overlapped and welded so as to sandwich the edge (GG) (186) of the second brace (25) between the two brace fixing upper plates (22) is formed to a dimension of 61 mm, and similarly The overlap width (K) (140) of the overlapping portion of the side (FF) (185) is formed to be 12 mm in order to sandwich and weld the ends of the third brace (26) and the fourth brace (27) together in a sandwich-like manner at a position one-quarter of the way from the bottom end on the center line of the plate mounting surface (B) (32). In order to weld the ends of the third brace (26) and the fourth brace (27) together in a sandwich-like manner, the brace fixing lower plate (23) is formed from a rectangular plate with a thickness of 6 mm and has a side (Q) (111) of 70 mm, a side (T) (114) of 230 mm, and a side (S) (113) of 70 mm.The steel column mounting part (112) is formed with a dimension of 230 mm. The edge (JJ) (189) of the third brace (26) is abutted against the tip where the edge (Q) (111) and edge (T) (114) of the two lower brace fixing plates (23) intersect. The edge (JJ) (189) of the third brace (26) is overlapped and welded to the two lower brace fixing plates (23) so that it is sandwiched between them. The overlap width (M) (142) of the part where it is welded is formed with a dimension of 61 mm. The overlap width (N) (143) of the edge (KK) (190) of the third brace (26), which is overlapped and welded in a sandwich-like manner, is formed to a dimension of 12 mm, and the edge (OO) (194) of the fourth brace (27) is abutted so as to contact the tip where the edge (T) (114) and the edge (S) (113) of the two brace fixing lower plates (23) intersect, and the edge (OO) (194) of the fourth brace (27) is sandwiched between the two brace fixing lower plates (23). The overlap width (P) (145) of the part to be welded and sandwiched in a sandwich shape is formed to be 62 mm, and similarly, the overlap width (O) (144) of the side (NN) (193) of the overlapped part to be sandwiched and welded is formed to be 12 mm. The upper end plate (19) for brace fixing and the upper and lower center plate (20) for brace fixing are welded to the plate mounting surface (A) (33) of the first steel column (9). ) and a lower end plate (21) for fixing the brace, and an upper plate (22) and a lower plate (23) for fixing the brace welded to the plate mounting surface (B) (32) of the second steel column (10) located opposite each other, and both ends of four first braces (24), second braces (25), third braces (26), and fourth braces (27) formed from square steel pipes with a side length of 80 mm and a thickness of 2.3 mm are welded in an M-shape. [Effects of the Invention]

[0015] According to the invention of claim 1, in an earthquake-resistant frame for earthquake-resistance reinforcement of a steel-frame building, there is provided a first steel column (9) and a second steel column (10), each of which is made of two square steel pipes formed in the same shape, each having a side of 100 mm, a thickness of 4.5 mm, and a length of 1926 mm, and which are arranged in parallel at an interval of 700 mm; The aforementioneda lower beam frame (28) welded to both ends of the upper surface of a flange formed from an H-shaped steel beam having a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, a web thickness of 5.5 mm, and a length of 900 mm; and an upper end end plate (36) welded to the upper end (A) (68) of the steel column at the upper end of the first steel column (9), the upper end plate (36) being a square flat steel plate having a side dimension of 100 mm and a thickness of 9 mm, with four bolt holes (37) formed in a square shape, and four beam fixing nuts (70) welded to the steel column mounting surface (A) (67) on the underside of the four bolt holes (37); The beam fixing plate (31) is a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a thickness of 9 mm, and has four bolt holes (38) formed at the four corners. The plate is welded to the upper end of the steel column upper end (B) (75) at the top end of the second steel column (10). The upper end of the first brace (24) is sandwiched and welded to the upper end of the plate mounting surface (A) (33) of the first steel column (9). The brace fixing upper end plate (19) is made of a rectangular plate with a thickness of 6 mm, and has a side (A) (95) of 81 mm and a side (B) (96). The dimension of the upper end plate (19) for fixing the brace is 99 mm, the dimension of the side (C) (97) is 70 mm, the dimension of the steel column attachment part (98) is 140 mm, the angle (A) where the side (A) (95) and the side (B) (96) intersect is 240 degrees, the angle (B) where the side (B) (96) and the side (C) (97) intersect is 90 degrees, the angle (B) where the steel column attachment part (98) intersects with the side (A) (95) is 300 degrees, and the angle (B) where the steel column attachment part (98) intersects with the side (A) (95) is 300 degrees. The overlap width (A) (130) of the first brace 24 is 12 mm. Similarly, the overlap width (B) (131) of the side (CC) (182) of the first brace 24 is 58 mm. Furthermore, the ends of the second brace 25 and the third brace 26 are overlapped and welded together in a sandwich-like manner at the top and bottom central portions on the center line of the plate mounting surface (A) (33). The side (E) (99) of the upper and lower central plate (20) for fixing the braces, made of a 6 mm thick rectangular plate, is 70 mm.The side (F) (100) dimension is 230 mm, the side (G) (101) dimension is 70 mm, and the steel column attachment part (102) dimension is 230 mm. The side (FF) (185) of the second brace (25) is abutted so as to contact the tip where the side (E) (99) and the side (F) (100) of the two identically shaped upper and lower central plates (20) for fixing the brace intersect, and the side (FF) (185) of the second brace (25) is overlapped and welded so as to sandwich the two upper and lower central plates (20) for fixing the brace in a sandwich shape. The overlap width (C) (132 ) dimension is 61 mm, and similarly, the overlap width (D) (133) of the overlapping part of the edge (GG) (186) is formed to a dimension of 12 mm so that it will be sandwiched and welded together, and then the edge (KK) (190) of the third brace (26) is abutted so that it comes into contact with the tip where the edge (F) (100) and the edge (G) (101) of the two upper and lower central plates (20) for fixing the braces intersect, and the edge (KK) (190) of the third brace (26) is overlapped and welded together so that it is sandwiched between the two upper and lower central plates (20) for fixing the braces. The overlap width (F) (135) of the mating part is formed to a dimension of 61 mm, and similarly, the overlap width (E) (134) of the overlapping part side (JJ) (189) is formed to a dimension of 12 mm to sandwich and weld the end of the fourth brace (27) to the lower end on the center line of the plate mounting surface (A) (33) so that it is sandwiched and welded. Furthermore, the dimension of the side (I) (103) of the brace fixing lower end plate (21) formed from a rectangular plate with a thickness of 6 mm is 70 mm, and the dimension of the side (J) (104) is 12 mm. The side (NN) (193) of the fourth brace (27) is abutted against the tip where the sides (I) (103) and (J) (104) of the two identical brace fixing lower end plates (21) intersect, with the side (K) (105) measuring 70 mm and the steel column mounting portion (106) measuring 110 mm. The fourth brace (27) is sandwiched between the two brace fixing lower end plates (21) and welded together, so the overlap width (G) (136) of the overlapping portion of the side (NN) (193) is 62 mm. Similarly,The two brace fixing lower end plates (21) have an overlap width (H) (137) of 12 mm on the side (OO) (194) of the overlapping portion to sandwich and weld the ends of the first brace (24) and the second brace (25) together, and the upper brace fixing plate (22) is made of a rectangular plate with a thickness of 6 mm. The side (M) (107) of the upper brace fixing plate (22) is 70 mm and the side (P) of the upper brace fixing plate (22) is 6 mm thick and is welded to the center line of the plate mounting surface (B) (32) of the second steel column (10) at a position one-quarter of the way from the top end to sandwich and weld the ends of the first brace (24) and the second brace (25). The dimension of (110) is 230 mm, the dimension of the side (O) (109) is 70 mm, and the dimension of the steel column attachment part (108) is 230 mm. The side (BB) (181) of the first brace (24) is abutted so as to contact the tip where the side (M) (107) and the side (P) (110) of the two brace fixing upper plates (22) intersect, and the overlap width (I) (138) of the part where the side (BB) (181) of the first brace (24) is overlapped and welded so as to sandwich the two brace fixing upper plates (22) in a sandwich shape is formed with a dimension of 58 mm. The overlap width (J) (139) of the edge (CC) (182) of the first brace (24) is formed to a dimension of 12 mm, and the edge (GG) (186) of the second brace (25) is abutted so as to contact the tip where the edge (P) (110) and the edge (O) (109) of the two brace fixing upper plates (22) intersect, and the overlap width (L) (141) of the part where the edge (GG) (186) of the second brace (25) is overlapped and welded so as to sandwich the edge (GG) (186) of the second brace (25) between the two brace fixing upper plates (22) is formed to a dimension of 61 mm, and similarly The overlap width (K) (140) of the overlapping portion of the side (FF) (185) is formed to be 12 mm in order to sandwich and weld the ends of the third brace (26) and the fourth brace (27) together in a sandwich-like manner at a position one-quarter of the way from the bottom end on the center line of the plate mounting surface (B) (32). In order to weld the ends of the third brace (26) and the fourth brace (27) together in a sandwich-like manner, the brace fixing lower plate (23) is formed from a rectangular plate with a thickness of 6 mm and has a side (Q) (111) of 70 mm, a side (T) (114) of 230 mm, and a side (S) (113) of 70 mm.The steel column mounting portion (112) is formed with a dimension of 230 mm. The edge (JJ) (189) of the third brace (26) is abutted against the tip where the edge (Q) (111) and edge (T) (114) of the two lower brace fixing plates (23) intersect. The edge (JJ) (189) of the third brace (26) is sandwiched between the two lower brace fixing plates (23) and welded to a width of 61 mm. The overlap width (N) (143) of the side (KK) (190) of the third brace (26) is formed to a dimension of 12 mm, and the side (OO) (194) of the fourth brace (27) is abutted so as to contact the tip where the side (T) (114) and the side (S) (113) of the two brace fixing lower plates (23) intersect, and the overlap width (P) (145) of the part where the side (OO) (194) of the fourth brace (27) is overlapped and welded to the two brace fixing lower plates (23) so as to sandwich the side (OO) (194) of the fourth brace (27) between them is formed to a dimension of 62 mm, and the overlap width (P) (145) of the part where the side (OO) (194) of the fourth brace (27) is overlapped and welded to the two brace fixing lower plates (23) is formed to a dimension of 62 mm. Similarly, two brace fixing lower plates (23) with an overlap width (O) (144) of 12 mm on the side (NN) (193) of the overlapping portion for sandwich welding connection, a brace fixing upper end plate (19), a brace fixing upper and lower center plate (20), and a brace fixing lower end plate (21) welded to the plate mounting surface (A) (33) of the first steel frame column (9), and a brace fixing upper end plate (19) welded to the plate mounting surface (B) (32) of the second steel frame column (10) located opposite to the brace fixing lower end plate (23). The upper plate (22) and the lower plate (23) for fixing the braces are made of four square steel pipes with a side length of 80 mm and a thickness of 2.3 mm. The first brace (24), the second brace (25), the third brace (26), and the fourth brace (27) are welded at both ends in an M shape to the upper plate (22) and the lower plate (23) for fixing the braces. This makes it possible to make the width of the earthquake-resistant frame narrower than the X-shaped and K-shaped earthquake-resistant frames that have been commonly used up until now, and therefore makes it possible to increase the width of openings such as windows and entrances in the building. [Example]

[0019] Hereinafter, an embodiment of the present invention will be described. DETAILED DESCRIPTION OF THE INVENTION

[0020] 1 to 8 show an embodiment of the present invention.

[0021] Figure 1 shows a steel frame structure 1 for constructing a steel-frame building. The plan view shows multiple anchor bolts 11 embedded in predetermined positions in foundation concrete 12, a first-floor steel frame structure with an M-shaped earthquake-resistant frame 5 for the first floor, a second-floor steel frame structure with an M-shaped earthquake-resistant frame 4 for the second floor, a third-floor steel frame structure with an M-shaped earthquake-resistant frame 3 for the third floor, a fourth-floor steel frame structure with an M-shaped earthquake-resistant frame 2 for the fourth floor, ALC wall panels 8 that make up the exterior walls, ALC panels 14 that make up the gable roof, and FRP waterproofing 15 that waterproofs the roof.

[0022] Furthermore, the earthquake-resistant M-shaped frame 13 for the first floor of a steel frame structure shown in Figure 1 is constructed with the same shape as the earthquake-resistant M-shaped frame 5 for the first floor of a steel frame structure, but flipped left and right, and is shown installed on opposite sides of the same floor to improve earthquake resistance performance.

[0023] Figure 2 is a perspective view of the earthquake-resistant M-shaped frame 5 for the first floor of a steel frame structure, foundation concrete 12, anchor bolts 11, main girder (A) 6, and main girder (B) 7 explained in Figure 1. The earthquake-resistant M-shaped frame 5 for the first floor of a steel frame structure is made up of two square steel pipes formed in the same shape, each 100 mm on a side, 4.5 mm thick, and approximately 1926 mm long, arranged in parallel at 700 mm intervals. The lower ends of the first steel column 9 and second steel column 10 are welded to both ends of the upper flange of a lower beam frame 28 formed from an H-shaped steel beam with a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, a web thickness of 5.5 mm, and a length of approximately 900 mm. Two brace fixing upper end plates 19 of the same shape are welded to the upper end on the center line of the plate mounting surface (A) 33 of the 9 so as to sandwich the end of the first brace 24, and two brace fixing upper and lower center plates 20 of the same shape are welded to the upper and lower center on the center line of the plate mounting surface (A) 33 so as to sandwich the end of the second brace 25 and the third brace 26, and Two brace fixing lower end plates 21 of the same shape are welded and joined so as to sandwich the ends of the first brace 24 and the second brace 25 in a sandwich shape, and two brace fixing upper plates 22 are welded and joined so as to sandwich the ends of the first brace 24 and the second brace 25 in a sandwich shape at a position one-quarter of the way from the upper end on the center line of the plate mounting surface (B) 32 of the second steel frame column 10, and further two brace fixing upper plates 22 are welded and joined so as to sandwich the ends of the third brace 26 and the fourth brace 27 in a position one-quarter of the way from the lower end on the center line of the plate mounting surface (B) 32 of the second steel frame column 10. The brace fixing upper end plate 19, brace fixing upper and lower center plates 20, and brace fixing lower end plate 21 are welded to the plate mounting surface (A) 33 of the first steel column 9, and the brace fixing upper plate 22 and brace fixing lower plate 23 are welded to the plate mounting surface (B) 32 of the second steel column 10 located opposite each other. Each side is 80 mm long and has a thickness of 2.The ends of the four braces, a first brace 24, a second brace 25, a third brace 26, and a fourth brace 27, formed from 3 mm square steel pipes, are welded together in an M shape, and an upper end plate 36 formed from a square flat steel plate about 100 mm long, about 100 mm wide, and 9 mm thick is welded together to the upper end of the first steel column 9, and a beam fixing plate 31 formed from a rectangular flat steel plate about 100 mm long, about 270 mm wide, and 9 mm thick is welded together to the upper end of the second steel column 10. The figure shows the state in which the lower flange (A) 55 of girder (A) 6 and the lower flange (B) 64 of girder (B) 7 of girder (A) 6, which are made of two identical H-shaped steel beams with a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, and a web thickness of 5.5 mm, fixed at right angles to each other in an L shape with gusset plates 16, bolts 17, and nuts (not shown), are placed on the upper surfaces of end plate 36 and beam fixing plate 31, and the L-shaped girder (A) 6 and girder (B) 7 are fixed to the first steel column 9 and the second steel column 10 with bolts 18 and 30.

[0024] Figure 3 is a perspective view showing the state when viewed from approximately the opposite direction to the perspective view explained in Figure 2. Figure 3 clearly shows in perspective the positions of the brace fixing upper end plate 19 welded to the upper end on the center line of the brace mounting surface (A) 33 of the first steel column 9, the brace fixing upper and lower center plates 20 welded to the upper and lower center parts, and the brace fixing lower end plate 21 welded to the lower end.

[0025] Figure 4 is a perspective view showing the state of the M-shaped earthquake-resistant frame 5 for first floor steel structures described in Figure 2, excluding the main girder (A) 6 and main girder (B) 7 attached to the top, as well as the anchor bolts 11 and foundation concrete 12 at the bottom. By assembling the M-shaped earthquake-resistant frame 5 for first floor steel structures configured in this way using an assembly jig in a factory, it has become possible to inexpensively manufacture the M-shaped earthquake-resistant frame 5 for first floor steel structures with improved assembly precision.

[0026] Fig. 5 shows an exploded view of the earthquake-resistant M-shaped frame 5 for the first floor of a steel frame structure explained in Fig. 2. The frame includes an upper end plate 36, which is a square flat steel plate with a side length of 100 mm and a thickness of 9 mm and has four bolt holes 37 formed in a roughly square shape, for welding to the steel column upper end (A) 68 at the top end of the first steel column 9 formed from a square steel pipe with a side length of 100 mm, a thickness of 4.5 mm, and a length of approximately 1926 mm, and four beam fixing nuts 70 for welding to the steel column mounting surface (A) 67 on the underside of the four bolt holes 37 formed in the upper end plate 36, and Furthermore, two brace fixing upper end plates 19 formed in the same shape are welded to the upper end of the plate mounting surface (A) 33 of the first steel frame column 9, two brace fixing upper and lower center plates 20 formed in the same shape are welded to the upper and lower centers of the plate mounting surface (A) 33 of the first steel frame column 9, two brace fixing lower end plates 21 formed in the same shape are welded to the lower end of the first steel frame column 9, and a steel frame column upper end plate 19 at the upper end of the second steel frame column 10. The beam fixing plate 31 is a rectangular flat steel plate with a length of approximately 100 mm, a width of approximately 270 mm, and a thickness of 9 mm, and has four bolt holes 38 formed at approximately the four corners thereof for welding to the end (B) 75. Two upper brace fixing plates 22 are formed in the same shape for welding to a quarter position from the upper end on the center line of the plate mounting surface (B) 32 of the second steel frame column 10. Furthermore, two upper brace fixing plates 22 are formed in the same shape for welding to a quarter position from the upper end on the center line of the plate mounting surface (B) 32 of the second steel frame column 10. The lower beam frame 28 is formed from an H-shaped steel beam with a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, a web thickness of 5.5 mm, and a length of approximately 900 mm.The ...

[0027] Furthermore, Figure 5 shows that in order to attach the upper end plate 36 and the beam fixing plate 31 welded to the top of the first steel column 9 and the second steel column 10 to the lower flange (A) 55 of the girder (A) 6 fixed at right angles in an L-shape and the lower flange (B) 64 of the girder 7, four bolt holes 57 are formed at positions corresponding to the four bolt holes 37 formed in the upper end plate 36 of the first steel column 9, and four bolts 18 are inserted into four beam fixing nuts 70 welded to the underside of the upper end plate 36 to fix the lower flange (A) 55 of the girder (A) 6 and the upper end plate 36. Similarly, four bolt holes 65 are formed at positions on the lower flange (B) 64 of the girder that correspond to the four bolt holes 38 formed in the beam fixing plate 31 of the second steel column 10, and the four bolts 30 and four nuts 73 for fixing the lower flange (B) 64 of the girder (A) 7 to the beam fixing plate 31 are shown in an exploded view.

[0028] Figure 6 shows a front view of the earthquake-resistant M-shaped frame 5 for the first floor of a steel frame structure explained in Figure 2, and also shows enlarged views of Figures 6a to 6e showing the upper end plate 19 for fixing the brace, the upper and lower central plates 20 for fixing the brace, and the lower end plate 21 for fixing the brace welded to the plate mounting surface (A) 33 of the first steel column 9, as well as the upper plate 22 for fixing the brace and the lower plate 23 for fixing the brace welded to the plate mounting surface (B) 32 of the second steel column 10.

[0029] 6a shows the first steel column 9 by a dotted line and the brace fixing upper end plate 19 welded to the plate mounting surface (A) 33 at the upper end of the first steel column 9 by a solid line. The brace fixing upper end plate 19 is two 6 mm thick rectangular plates formed in the same shape to sandwich and fix the end of the first brace 24 formed from a square steel pipe with one side of 80 mm and a thickness of 2.3 mm to the plate mounting surface (A) 33 of the first steel column 9. The dimensions of side (A) 95 are approximately 81 mm, side (B) 96 are approximately 99 mm, side (C) 97 are approximately 70 mm, and the dimension of the steel column mounting portion 98 is approximately 140 mm. Furthermore, the angle A at which side (A) 95 and side (B) 96 intersect is approximately 240 degrees, the angle at which side (B) 96 and side (C) 97 intersect is 90 degrees, the angle at which side (C) 97 intersects with steel column mounting portion 98 is 90 degrees, and the angle B at which steel column mounting portion 98 intersects with side (A) 95 is approximately 300 degrees.The state in which the tip at which side (A) 95 and steel column mounting portion 98 intersect is positioned so as to be located at the upper end of plate mounting surface (A) 33 and steel column mounting portion 98 is welded and joined to plate mounting surface (A) 33 is shown.

[0030] FIG. 6b shows the first steel column 9 in dotted lines, and the brace fixing central upper and lower plates 20 welded to the central upper and lower portions of the plate mounting surface (A) 33 of the first steel column 9 in solid lines. The upper and lower central plates 20 for fixing the braces are two 6 mm thick rectangular plates formed in the same shape to sandwich and fix the ends of the second brace 25 and the third brace 26, which are formed from square steel pipes with sides of 80 mm and a thickness of 2.3 mm, to the plate mounting surface (A) 33 of the first steel column 9.The plates are formed with side (E) 99 measuring approximately 70 mm, side (F) 100 measuring approximately 230 mm, side (G) 101 measuring approximately 70 mm, and the steel column mounting portion 102 measuring approximately 230 mm, and are shown welded together with the upper and lower central portions of the steel column mounting portion 102 abutting against the upper and lower central portions of the plate mounting surface (A) 33.

[0031] FIG. 6c shows the first steel column 9 in dotted lines and the brace fixing lower end plate 21 welded to the plate mounting surface (A) 33 at the lower end of the first steel column 9 in solid lines. The lower end plate 21 for fixing the brace is two 6 mm thick rectangular plates formed in the same shape to sandwich and fix the end of the fourth brace 27, which is formed from a square steel pipe with a side length of 80 mm and a thickness of 2.3 mm, to the plate mounting surface (A) 33 of the first steel column 9. The dimensions of side (I) 103 are approximately 70 mm, the dimension of side (J) 104 is approximately 110 mm, the dimension of side (K) 105 is approximately 70 mm, and the dimension of steel column mounting portion 106 is approximately 110 mm. The plate is positioned so that the tip where side (K) 105 and steel column mounting portion 106 intersect is in contact with the lower end of the plate mounting surface (A) 33, and the state in which the steel column mounting portion 106 is welded and joined to the plate mounting surface (A) 33 is shown.

[0032] FIG. 6d shows the second steel column 10 in dotted lines and the upper brace fixing plate 22 welded to the plate mounting surface (B) 32 at a position one-quarter of the way from the top end of the second steel column 10 in solid lines. The upper plate 22 for fixing the brace is two 6 mm thick rectangular plates formed in the same shape to sandwich and fix the ends of the first brace 24 and the second brace 25, which are formed from square steel pipes with sides of 80 mm and a thickness of 2.3 mm, to the plate mounting surface 32 of the second steel column 10. The dimensions of side (M) 107 are approximately 70 mm, the dimension of side (P) 110 is approximately 230 mm, the dimension of side (O) 109 is approximately 70 mm, and the dimension of the steel column mounting portion 108 is approximately 230 mm. The upper and lower centers of the steel column mounting portion 108 are shown abutting and welded to a position one-quarter of the way from the top of the plate mounting surface (B) 32.

[0033] 6e shows the second steel column 10 with a dotted line and the brace fixing lower plate 23 welded to the plate mounting surface (B) 32 located one-quarter of the way down from the bottom of the second steel column 10 with a solid line. The brace fixing lower plate 23 is two identical 6 mm thick rectangular plates formed to sandwich the ends of the third brace 26 and the fourth brace 27 formed from square steel pipes with sides of 80 mm and a thickness of 2.3 mm to fix them to the second steel column 10. The dimensions of the side (Q) 111 are approximately 70 mm, the side (T) 114 are approximately 230 mm, the side (S) 113 are approximately 70 mm, and the steel column mounting portion 112 is approximately 230 mm. The state shown is that the upper and lower centers of the steel column mounting portion 112 are abutted and welded to the plate mounting surface (B) 32 located one-quarter of the way down from the bottom.

[0034] 7 is a front view showing the state in which four braces, a first brace 24, a second brace 25, a third brace 26, and a fourth brace 27, are welded to the brace fixing upper end plate 19, the brace fixing upper and lower center plate 20, the brace mounting lower end plate 21, the brace fixing upper plate 22, and the brace fixing lower plate 23 of the earthquake-resistant M-shaped frame 5 for the first floor of the steel frame structure explained in FIG. 4, and also shows enlarged views of FIGS. 7a to 7e showing the braces attached to the plate mounting surface (A) 33 of the first steel column 9. The enlarged view shows the first brace 24, second brace 25, third brace 26, and fourth brace 27 welded to the upper end plate 19 for brace fixation, the upper and lower central plates 20 for brace fixation, and the lower end plate 21 for brace fixation, as well as the upper plate 22 for brace fixation attached to the plate mounting surface (B) 32 of the second steel column 10 and the first brace 24, second brace 25, third brace 26, and fourth brace 27 welded to the lower plate 23 for brace fixation.

[0035] Figure 7a shows, with dotted lines, the state in which the end of the first brace 24 is sandwiched and fixed between two identically shaped brace fixing upper end plates 19. Overlap width (A) 130 is the overlapping portion where side (BB) 181 (shown in Figure 8) of the first brace 24 abuts against side (A) 95 (shown in Figure 6a) of the brace fixing upper end plate 19 for welding, and overlap width (A) 130 is approximately 12 mm. Similarly, overlap width (B) 131 is the overlapping portion where the first brace 24 is sandwiched between the two brace fixing upper end plates 19 for welding, and the dimension of overlap width (B) 131 shown with dotted lines is approximately 58 mm.

[0036] Figure 7b shows with dotted lines the state in which the ends of the second brace 25 and the third brace 26 are sandwiched and fixed between two identically shaped upper and lower central plates 20 for fastening the braces. The overlap width (C) 132 is the overlapping portion where edge (FF) 185 (shown in Figure 8) of the second brace 25 is positioned so as to contact the tip where edge (E) 99 and edge (F) 100 described in Figure 6b intersect, and the two identically shaped upper and lower central plates 20 for fastening the braces are sandwiched and welded together, and the dimension of overlap width (C) 132 shown with dotted lines is approximately 61 mm. Similarly, overlap width (D) 133 is the overlapping portion where edge (GG) 186 (shown in Figure 8) of second brace 25 is sandwiched between two upper and lower brace fixing center plates 20 and welded together, and the dimension of overlap width (D) 133 shown by dotted lines is approximately 12 mm. Furthermore, overlap width (E) 134 is the overlapping portion where edge (JJ) 189 (shown in Figure 8) of third brace 26 is sandwiched between two upper and lower brace fixing center plates 20 and welded together, and the dimension of overlap width (E) 134 shown by dotted lines is approximately 12 mm. Similarly, overlap width (F) 135 is the overlapping portion where side (KK) 190 (shown in Figure 8) of third brace 26 is positioned so as to abut the tip where side (F) 100 and side (G) 101 explained in Figure 6b intersect, and is sandwiched and welded together between two identically shaped upper and lower central plates 20 for fixing the brace, and the dimension of overlap width (F) 135 shown by the dotted line is approximately 61 mm.

[0037] Figure 7c shows the state in which the end of the fourth brace 27 is sandwiched and fixed between two identically shaped lower end plates 21 for brace fixation. To sandwich and weld the end of the fourth brace 27 between the two lower end plates 21 for brace fixation, edge (NN) 193 (shown in Figure 8) of the fourth brace 27 is positioned so that it abuts the tip where edge (I) 103 and edge (J) 104 described in Figure 6c intersect. The overlap width (G) 136 between the lower end plate 21 for brace fixation and the fourth brace 27, shown by the dotted line, is approximately 62 mm. Similarly, the overlap width (H) 137 is the overlapping portion for sandwiching and welding the fourth brace 27 between the two lower end plates 21 for brace fixation. The overlap width (H) 137, shown by the dotted line, is approximately 12 mm.

[0038] Figure 7d shows, with dotted lines, the state in which the ends of the first brace 24 and the second brace 25 are sandwiched and fixed between two identically shaped upper brace fixing plates 22. The overlap width (I) 138 is the overlapping portion where the edge (BB) 181 (shown in Figure 8) of the first brace 24 is positioned so that it abuts the tip where the edge (M) 107 and the edge (P) 110 described in Figure 6d intersect, and the two identically shaped upper brace fixing plates 22 are sandwiched and welded together. The overlap width (I) 138 shown by the dotted line is approximately 58 mm. Similarly, the overlap width (J) 139 is the overlapping portion where the edge (CC) 182 (shown in Figure 8) of the first brace 24 is sandwiched and welded together between the two upper brace fixing plates 22. The overlap width (J) 139 shown by the dotted line is approximately 12 mm. Furthermore, overlap width (K) 140 is the overlapping portion where side (FF) 185 (shown in Figure 8) of second brace 25 is sandwiched between two brace fixing upper plates 22 and welded together, and the dimension of overlap width (K) 140 shown by dotted lines is approximately 12 mm. Similarly, overlap width (L) 141 is the overlapping portion where side (GG) 186 (shown in Figure 8) of second brace 25 is positioned so as to contact the tip where side (P) 110 and side (O) 109 described in Figure 6d intersect, and where two brace fixing upper plates 22 formed to the same shape are sandwiched together and welded together, and the dimension of overlap width (L) 141 is approximately 61 mm.

[0039] Figure 7e shows with dotted lines the state in which the ends of the third brace 26 and the fourth brace 27 are sandwiched and fixed between two identically shaped lower brace fixing plates 23. The overlap width (M) 142 is the overlapping portion where side (JJ) 189 (shown in Figure 8) of the third brace 26 is positioned so as to abut the tip where side (Q) 111 and side (T) 114 described in Figure 6e intersect, and the two identically shaped lower brace fixing plates 23 sandwich the ends together and weld them together, and the dimension of overlap width (M) 142 shown by the dotted line is approximately 61 mm. Similarly, overlap width (N) 143 is the overlapping portion where side (KK) 190 (shown in FIG. 8) of third brace 26 is sandwiched between two brace fixing lower plates 23 and welded together, and the dimension of overlap width (N) 143 shown by dotted lines is approximately 12 mm. Furthermore, overlap width (O) 144 is the overlapping portion where side (NN) 193 (shown in FIG. 8) of fourth brace 27 is sandwiched between two brace fixing lower plates 23 and welded together, and the dimension of overlap width (O) 144 shown by dotted lines is approximately 12 mm. Similarly, overlap width (P) 145 is the overlapping portion where side (OO) 194 (shown in Figure 8) of fourth brace 27 is positioned so as to abut the tip where side (T) 114 and side (S) 113 explained in Figure 6e intersect, and is sandwiched between two identically shaped lower brace fixing plates 23 and welded together, and the dimension of overlap width (P) 145 shown by the dotted line is approximately 62 mm.

[0040] Furthermore, welds (A) 146, (B) 148, (C) 156, (D) 150, (E) 152, (F) 158, (G) 160, and (H) 155 in Figure 7 indicate the positions where the first brace 24, the second brace 25, the third brace 26, and the fourth brace 27 are welded and fixed to the two brace fixing upper end plates 19, the two brace fixing upper and lower center plates 20, the brace fixing lower end plate 21, the brace fixing upper plate 22, and the brace fixing lower plate 23, respectively.

[0041] Figure 8 is a front view of the disassembled first-floor M-shaped steel frame 5 for earthquake-resistant steel structures, shown in Figure 7, including the first steel column 9, second steel column 10, upper brace fixing plate 19, upper and lower central brace fixing plates 20, lower brace fixing plate 21, upper brace fixing plate 22, lower brace fixing plate 23, first brace 24, second brace 25, third brace 26, fourth brace 27, and lower end frame 28. The first brace 24 is formed from a square steel pipe with a side length of approximately 80 mm, a thickness of 2.3 mm, and a length of approximately 718 mm, and both ends are welded to the upper brace fixing plate 19 and the upper brace fixing plate 22 at an angle of approximately 30.2 degrees relative to the horizontal, as shown by angle C. Similarly, the second brace 25 is formed from a square steel pipe with a side length of approximately 80 mm, a wall thickness of 2.3 mm, and a length of approximately 731 mm, and both ends are welded to the brace fixing upper plate 22 and the brace fixing upper and lower center plates 20 at an angle of approximately 31.7 degrees with respect to the horizontal, as shown by angle D. Similarly, the third brace 26 is formed from a square steel pipe with a side length of approximately 80 mm, a wall thickness of 2.3 mm, and a length of approximately 731 mm, and both ends are welded to the brace fixing upper and lower center plates 20 and the brace fixing lower plate 23 at an angle of approximately 31.7 degrees with respect to the horizontal, as shown by angle E. Similarly, the fourth brace 27 is formed from a square steel pipe with a side length of approximately 80 mm, a thickness of 2.3 mm, and a length of approximately 735 mm, and both ends are welded to the lower brace fixing plate 23 at an angle of approximately 32.1 degrees to the horizontal, as shown by angle F, relative to the lower end brace fixing plate 21.

[0042] The earthquake-resistant M-shaped frame for the first floor of a steel frame structure according to the present invention has been described in detail above based on the embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention without departing from the spirit of the invention. [Brief explanation of the drawings]

[0043] [Figure 1]1 is a front view of a steel frame structure for constructing a steel frame building according to an embodiment of the present invention; [Figure 2] 2 is a perspective view showing an earthquake-resistant M-shaped frame for the first floor of a steel frame structure according to the embodiment, which is installed on the first floor of the steel frame structure shown in FIG. 1. FIG. [Figure 3] 3 is a perspective view showing the earthquake-resistant M-shaped frame for the first floor of a steel frame structure shown in FIG. 2 according to the embodiment, viewed from the opposite direction. [Figure 4] 3 is a perspective view showing the earthquake-resistant M-shaped frame for the first floor of a steel frame structure shown in FIG. 2, with the main beams and foundation concrete removed, according to the embodiment. [Figure 5] 3 is an exploded view of the earthquake-resistant M-shaped frame for the first floor of a steel frame structure shown in FIG. 2 according to the embodiment. [Figure 6] 3 is a front view of the earthquake-resistant M-shaped frame for the first floor of a steel frame structure shown in FIG. 2 according to the embodiment. [Figure 7] 7 is a front view showing a state in which braces are welded to the plates of the earthquake-resistant M-shaped frame for the first floor of a steel frame structure shown in FIG. 6 according to the embodiment. [Figure 8] 8 is an exploded view showing the plate and the brace of the earthquake-resistant M-shaped frame for the first floor of the steel frame structure shown in FIG. 7 according to the embodiment. [Explanation of symbols]

[0044] A angle B angle C angle D angle E angle F angle 1. Steel structure 2. Steel structure, earthquake-resistant M-shaped frame for 4 floors 3. Steel structure, 3rd floor, earthquake-resistant M-shaped frame 4. Steel structure, earthquake-resistant M-shaped frame for 2nd floor 5. Steel structure, earthquake-resistant M-shaped frame for first floor 6 Beam (A) 7 Beam (B) 8 ALC wall panels 9 First Steel Column 10 Second steel column 11 Anchor bolt 12 Foundation concrete 13 Steel structure, earthquake-resistant M-shaped frame for first floor 14 ALC board 15 FRP waterproof 16 Gusset plate 17 volts 18 volts 19 Upper end plate for fixing brace 20 Upper and lower central plates for fixing braces 21 Lower end plate for fixing brace 22 Upper plate for fixing brace 23 Lower brace fixing plate 24 First Brace 25 Second Brace 26 Third Brace 27 Fourth Brace 28 Lower beam frame 29 Nut 30 volts 31 Beam fixing plate 32 Plate mounting surface (B) 33 Plate mounting surface (A) 36 Upper end plate 37 bolt holes 38 bolt holes 40 Stiffener (A) 41 Anchor bolt hole (A) 42 Anchor bolt hole (B) 43 Stiffener (B) 55 Lower flange of girder (A) 56 Web(A) 57 bolt holes 63 Web(B) 64 Lower flange of girder (B) 65 bolt holes 66 Beam mounting surface (A) 67 Steel column mounting surface (A) 68 Steel column upper end (A) 70 Beam fixing nut 71 Beam mounting surface (B) 73 Nut 74 Steel column mounting surface (B) 75 Steel column top end (B) 76 Steel column bottom end (A) 77 Steel column (A) mounting surface 80 Web(C) 81 Steel column (B) mounting surface 82 Steel column bottom end (B) 95 Side(A) 96 Sides(B) 97 Side(C) 98 Steel column attachment part 99 Sides(E) 100 sides (F) 101 Sides (G) 102 Steel column attachment part 103 Sides(I) 104 Sides(J) 105 sides (K) 106 Steel column attachment part 107 sides (M) 108 Steel column attachment part 109 Side(O) 110 sides(P) 111 Side(Q) 112 Steel column attachment part 113 Sides (S) 114 Sides(T) 130 overlap width (A) 131 overlap width (B) 132 overlap width (C) 133 overlap width (D) 134 overlap width (E) 135 overlap width (F) 136 overlap width (G) 137 overlap width (H) 138 Overlap width (I) 139 overlap width (J) 140 overlap width (K) 141 overlap width (L) 142 overlap width (m) 143 overlap width (N) 144 overlap width (O) 145 overlap width (P) 146 Welding Section (A) 147 Intersection (A) 148 Welded Section (B) 149 Intersection (B) 150 Welded section (D) 151 Intersection (D) 152 Welded Section (E) 153 Intersection (E) 154 Intersection (H) 155 Welded section (H) 156 Welded Section (C) 157 Intersection (C) 158 Welded Part (F) 159 Intersection (F) 160 Welded section (G) 161 Intersection (G) 180 sides (AA) 181 Sides (BB) 182 sides (CC) 183 sides (DD) 184 sides (EE) 185 sides (FF) 186 sides (GG) 187 sides (HH) 188 Sides (II) 189 Sides (JJ) 190 sides (KK) 191 sides (LL) 192 sides (MM) 193 sides (NN) 194 sides (OO) 195 sides (PP)

Claims

[Claim 1] In earthquake-resistant frames for strengthening the earthquake resistance of steel-framed buildings, A first steel column (9) and a second steel column (10) are made of two square steel pipes formed in the same shape with a side length of 100 mm, a wall thickness of 4.5 mm, and a length of 1926 mm, and are arranged parallel to each other at an interval of 700 mm; a lower beam frame (28) in which the lower ends of the first steel column (9) and the second steel column (10) are welded to both ends of the upper surface of a flange formed from an H-shaped steel having a height of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, a web thickness of 5.5 mm, and a length of 900 mm; an upper end end plate (36) which is a square flat steel plate 100 mm on a side and 9 mm thick and welded to the steel column upper end (A) (68) at the upper end of the first steel column (9), with four bolt holes (37) formed in a square shape, and four beam fixing nuts (70) welded to the steel column mounting surface (A) (67) on the underside of the four bolt holes (37); a beam fixing plate (31) welded to the upper end (B) (75) of the second steel column (10) and made of a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a thickness of 9 mm, and four bolt holes (38) formed at the four corners of the plate; The upper end plate (19) for fixing the brace is formed of a 6 mm thick rectangular plate in order to sandwich the end of the first brace (24) by welding it onto the upper end of the center line of the plate mounting surface (A) (33) of the first steel column (9). The dimensions of the side (A) (95) of the upper end plate (19) for fixing the brace are 81 mm, the dimension of the side (B) (96) is 99 mm, the dimension of the side (C) (97) is 70 mm, the dimension of the steel column mounting part (98) is 140 mm, and the angle (A) between the side (A) (95) and the side (B) (96) is 240 degrees, the angle (B) between the side (B) (96) and the side (C) (97) is 140 mm, and the angle (A) between the side (A) (95) and the side (B) (96) is 240 degrees. The angle at which the side (C) (97) and the steel column mounting portion (98) intersect is 90 degrees, the angle at which the side (C) (97) and the steel column mounting portion (98) intersect with the side (A) (95) is 90 degrees, and the angle (B) at which the steel column mounting portion (98) and the side (A) (95) intersect is 300 degrees. The overlap width (A) (130) of the side (BB) (181) of the first brace (24) at the overlapping portion is formed to be 12 mm, and similarly, the overlap width (A) (130) of the side (CC) (182) of the first brace 24 at the overlapping portion is formed to be 12 mm, and similarly, the overlap width ( The dimensions of the upper and lower central brace fixing plates (20) are 6 mm thick and are formed with a rectangular plate having a side (E) (99) dimension of 70 mm, a side (F) (100) dimension of 230 mm, a side (G) (101) dimension of 70 mm, and a steel column mounting portion (102) dimension of 230 mm. The edge (FF) (185) of the second brace (25) is abutted against the tip where the edge (E) (99) and the edge (F) (100) of the upper and lower central plate (20) for fixing the brace intersect, and the edge (FF) (185) of the second brace (25) is sandwiched between the two upper and lower central plates (20) for fixing the brace so that the overlap width (C) (132) of the part to be welded is formed to a dimension of 61 mm, and similarly, the overlap width (D) (133) of the edge (GG) (186) of the overlapping part to be sandwiched and welded is formed to a dimension of 12 mm,Furthermore, the edge (KK) (190) of the third brace (26) is abutted against the tip where the edges (F) (100) and (G) (101) of the two upper and lower central plates (20) for fixing the brace intersect, and the overlap width (F) (135) of the part where the edge (KK) (190) of the third brace (26) is overlapped and welded to sandwich the two upper and lower central plates (20) is formed to a dimension of 61 mm. Similarly, the overlap width (E) (134) of the edge (JJ) (189) of the overlapping part for sandwiching and welding is formed to a dimension of 12 mm. Furthermore, a brace fixing lower end plate formed from a rectangular plate with a thickness of 6 mm is used to overlap and weld the end of the fourth brace (27) to sandwich it in the lower end on the center line of the plate mounting surface (A) (33). The side (I) (103) of the fourth brace (27) has a dimension of 70 mm, the side (J) (104) has a dimension of 110 mm, and the side (K) (105) has a dimension of 70 mm. The side (NN) (193) of the fourth brace (27) is abutted against the tip where the side (I) (103) and the side (J) (104) of the two identically shaped brace fixing lower end plates (21) intersect, and the two braces are The fourth brace (27) is sandwiched between the lower end plate (21) for brace fixing and welded to the lower end plate (21), and the overlap width (G) (136) of the overlapping portion of the side (NN) (193) is 62 mm. Similarly, the overlap width (H) (137) of the overlapping portion of the side (OO) (194) is 12 mm. Furthermore, in order to sandwich the ends of the first brace (24) and the second brace (25) together by welding at a quarter position from the upper end on the center line of the plate mounting surface (B) (32) of the second steel column (10), two brace fixing upper plates (22) formed of rectangular plates with a thickness of 6 mm are formed with a side (M) (107) dimension of 70 mm, a side (P) (110) dimension of 230 mm, and a side (O) (109) dimension of 70 mm, and a steel column mounting portion (108) dimension of 230 mm. The edge (BB) (181) of the first brace (24) is abutted against the tip where the edge (M) (107) and edge (P) (110) of the brace fixing upper plate (22) intersect, and the edge (BB) (181) of the first brace (24) is overlapped and welded to sandwich the edge (BB) (181) of the first brace (24) between the two brace fixing upper plates (22) so that the overlap width (I) (138) is 58 mm. Similarly, the overlap width (I) (138) of the edge (CC) (182) of the first brace (24) is overlapped and welded to sandwich the edge (BB) (181) of the first brace (24) between the two brace fixing upper plates (22) so that the overlap width (I) (138) is 58 mm. The width (J) (139) is formed to a dimension of 12 mm, and the edge (GG) (186) of the second brace (25) is abutted so as to contact the tip where the edge (P) (110) and the edge (O) (109) of the two brace fixing upper plates (22) intersect, and the overlap width (L) (141) of the part where the edge (GG) (186) of the second brace (25) is overlapped and welded so as to sandwich the two brace fixing upper plates (22) in a sandwich shape is formed to a dimension of 61 mm, and similarly, The overlap width (K) (140) of the side (FF) (185) of the overlapping portion is formed to a dimension of 12 mm, and further, the ends of the third brace (26) and the fourth brace (27) are overlapped and welded together so as to sandwich them together at a position one-quarter of the way from the bottom end on the center line of the plate mounting surface (B) (32). In order to do this, the brace fixing lower plate (23) formed from a rectangular plate with a thickness of 6 mm has a dimension of a side (Q) (111) of 70 mm, a dimension of a side (T) (114) of 230 mm, and a dimension of a side (S) (113) of 70 mm.The steel column mounting portion (112) is formed to a dimension of 230 mm, and the edge (JJ) (189) of the third brace (26) is abutted against the tip where the edge (Q) (111) and edge (T) (114) of the two brace fixing lower plates (23) intersect. The edge (JJ) (189) of the third brace (26) is overlapped and welded to sandwich the edge (JJ) (189) of the third brace (26) between the two brace fixing lower plates (23) so that the overlap width (M) (142) is 61 mm. Similarly, the overlap width (N) (143) of the edge (KK) (190) of the third brace (26), which is overlapped and welded to sandwich the edge (JJ) (189) between the two brace fixing lower plates (23), is 12 mm. The edge (OO) (194) of the fourth brace (27) is abutted against the tip where the edge (T) (114) and edge (S) (113) of the two brace fixing lower plates (23) intersect, and the edge (OO) (194) of the fourth brace (27) is overlapped and welded to the two brace fixing lower plates (23) so that the overlap width (P) (145) is 62 mm. Similarly, the overlap width (O) (144) of the edge (NN) (193) of the overlapping portion to be sandwiched and welded to the two brace fixing lower plates (23) is 12 mm. An earthquake-resistant M-shaped frame for a first floor steel frame structure, characterized in that both ends of four first braces (24), second braces (25), third braces (26), and fourth braces (27) formed from square steel pipes with a side length of 80 mm and a thickness of 2.3 mm are welded in an M shape to the brace fixing upper end plate (19), brace fixing upper and lower central plates (20), and brace fixing lower end plate (21) welded to the plate mounting surface (A) (33) of the first steel column (9), and the brace fixing upper plate (22) and brace fixing lower plate (23) welded to the plate mounting surface (B) (32) of the second steel column (10) located opposite the first steel column (9).

Images