Seismic-resistant M-shaped frame for upper floors of steel frame structures

Abstract

To provide an earthquake-proof frame formed in a compact size.SOLUTION: An earthquake-proof M-shaped frame for an upper floor of a steel structure 4 is formed by welding connecting a first steel column 11 and a second steel column 12, which are formed of square steel tubes having the same shape and disposed in parallel, to roughly ends of four braces 33, 34, 35, 36 formed of square steel tubes into an M shape to the top end plate for fixing brace 28, the vertical center plate for fixing brace 29, and the bottom end plate for fixing brace 30, which are welded and connected to the first steel column 11, and to the upper plate for fixing brace 31 and the lower plate for fixing brace 32, which are welded and connected to the second steel column located to face the first steel column.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a seismic frame for installation on floors above the second floor in a steel frame structure.

Background Art

[0002] The framework used in a steel frame structure mainly consists of steel columns and beams, and braces or trusses are additionally provided as needed.

[0003] Braces and trusses reinforce the steel frame structure, and for buildings with high seismic resistance requirements, reinforcing materials such as braces and trusses are frequently used.

[0004] Conventionally, for braces installed in the area surrounded by the upper and lower beams of a steel frame structure and two steel columns, the ends of the braces are connected to gusset plates welded and attached to the opposing column sides (the upper part of one column and the lower part of the other column) with high-strength bolts and fixed in an X shape to form an X-shaped seismic frame, or a K-shaped seismic frame in which two braces in the frame are arranged in a K shape has been adopted.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the case of the X-shaped seismic frame, since braces (generally made of round bars or flat steel plates) are arranged in an X shape between two columns, when it is desired to provide an opening such as a window or a veranda between the two columns, there are restrictions on the position and size where the window or veranda can be installed.

[0006] Furthermore, the diameter of the undersize holes for high-strength bolts formed in the gusset plates and braces has conventionally required high precision of about 1 mm plus the bolt diameter in order to minimize the rattling of the gusset plates and braces. Therefore, the work of accurately welding and joining the gusset plates to the column sides requires skilled techniques and time, resulting in problems such as increased time and costs.

[0007] In the case of the K-shaped seismic-resistant frame, since the fixing parts of the two braces are limited to the upper and lower ends of one column and the central part of the other column, problems such as having to widen the frame spacing between the left and right or use a sturdy brace member in order to enhance the seismic resistance have occurred.

[0008] This invention has been made in view of the above problems, and by producing a seismic-resistant frame using jigs in a factory, a high-precision seismic-resistant frame is manufactured. Also, in order to form wide and large openings such as windows and entrances in a steel structure, it is an object of the present invention to provide a seismic-resistant frame that is formed to be narrow in width and compact.

[0009] Furthermore, it is an object of the present invention to provide a compact and strong seismic-resistant frame by welding a brace formed of a square steel pipe in a sandwich shape between two plates welded to the opposing column side surfaces of two columns on the left and right.

Means for Solving the Problem

[0010] In order to solve such problems, the invention according to claim 1 is a seismic-resistant frame for seismic reinforcement of a building having a steel structure, The first steel column (11) and the second steel column (12), which are two square steel pipes of the same shape with one side being 100 mm, a wall thickness of 4.5 mm, and a length of 2257 mm, are arranged in parallel at an interval of 700 mm. The a first steel column (11) of To be welded to the upper end part (A) (70) of the steel column, an upper end end plate (51) with a square shape of 100 mm on each side and a thickness of 9 mm, having four bolt holes (60) formed at the four corners, and further four beam fixing nuts (72) for welding and joining to the steel column mounting surface (A) (69) of the four bolt holes (60) formed on the upper end end plate (51). Further, to be welded to the lower end part (A) (84) of the first steel column (11), a lower end end plate (48) with a square shape of 100 mm on each side and a thickness of 9 mm, having four bolt holes (81) formed at the four corners, and further the four bolt holes (81) formed on the lower end end plate (48) of the four beam fixing nuts (79) for welding and joining to the steel column mounting surface (C) (80). The a second steel column (12) of To be welded to the upper end part (B) (78) of the steel column, a beam fixing plate (A) (38) with a rectangular shape of 100 mm in length, 270 mm in width, and a thickness of 9 mm, having four bolt holes (61) formed at the four corners, and further to be welded to the lower end part (B) (88) of the second steel column (12), a beam fixing plate (B) (42) with a rectangular shape of 100 mm in length, 270 mm in width, and a thickness of 9 mm, having four bolt holes (62) formed at the four corners. The the first steel column (11) of The dimension of side (A) (100) of the trapezoidal upper end plate (28) with a thickness of 6 mm for brace fixing, which is formed to sandwich and weld-join the end of the first brace (33) in a sandwich manner at the upper end on the center line of the plate mounting surface (A) (41), is 86 mm, the dimension of side (B) (101) is 90 mm, the angle (A) formed by the intersection of side (A) (100) and side (B) (101) is 239.8 degrees, the dimension of side (C) (102) is 70 mm, the angle formed by the intersection of side (B) (101) and side (C) (102) is 90 degrees, the dimension of the steel column mounting portion (103) is 140 mm, the angle formed by the intersection of the steel column mounting portion (103) and side (C) (102) is 90 degrees, and the angle (B) formed by the intersection of the steel column mounting portion (103) and side (A) (100) is 300.Form at 2 degrees, and form the overlapping width (A) (130) of the side (BB) (181) of the first brace (33) at 12 mm for butt-welding by sandwiching and abutting it against the side (A) (100) of two upper-end plates (28) for brace fixation of the same shape. Similarly, form the overlapping width (B) (131) of the side (CC) (182) of the first brace (33) at 55 mm for butt-welding by sandwiching. Further, form the dimensions of the side (E) (104) of the upper and lower central plate (29) for brace fixation, which is formed of a rectangular plate with a thickness of 6 mm, at 70 mm, the dimension of the side (F) (105) at 230 mm, the dimension of the side (G) (106) at 70 mm, and the dimension of the steel column mounting part (107) at 230 mm. Make the steel column mounting part (107) abut against the upper and lower central part of the plate mounting surface (A) (41) and perform butt-welding. Further, make the side (FF) (185) of the second brace (34) abut against the tip where the side (E) (104) and the side (F) (105) of the upper and lower central plate (29) for brace fixation intersect, and form the overlapping width (C) (132) at 74 mm for butt-welding by sandwiching and overlapping. Similarly, form the overlapping width (D) (133) of the side (GG) (186) at 13 mm for butt-welding by sandwiching. Further, make the side (KK) (190) of the third brace (35) abut against the tip where the side (F) (105) and the side (G) (106) of two upper and lower central plates (29) for brace fixation of the same shape intersect, and form the overlapping width (F) (135) at 75 mm for butt-welding by sandwiching and overlapping. Similarly, form the overlapping width (E) (134) of the side (JJ) (189) at 13 mm for butt-welding by sandwiching. Further, at the lower end of the center line of the plate mounting surface (A) (41), sandwich the end of the fourth brace (36) in a sandwich-like manner... For welding and joining by overlapping, the tip where the side (K) (110) and the steel column mounting portion (111) intersect is brought into contact with the lower end of the plate mounting surface (A) (41), and the steel column mounting portion (111) is welded and joined to the plate mounting surface (A) (41). The dimension of the side (I) (108) of the lower end plate (30) for brace fixing configured in this way is 70 mm, the dimension of the side (J) (109) is 90 mm, the angle at which the side (I) (108) and the side (J) (109) intersect is 90 degrees, the dimension of the side (K) (110) is 86 mm, the angle (C) at which the side (K) (110) and the side (J) (109) intersect is 234.5 degrees, the angle (D) at which the steel column mounting portion (111) and the side (K) (110) intersect is 305.5 degrees, the dimension of the steel column mounting portion (111) is formed to be 140 mm, and the overlapping width (G) (136) of the side (NN) (193) of the portion overlapped in a sandwich shape on two lower end plates (30) for brace fixing is formed to be 55 mm. Similarly, the overlapping width (H) (137) is a portion for butt-welding and joining by sandwiching the side (OO) (194) of the fourth brace (36) so as to overlap the side (K) (110) of the lower end plate (30) for brace fixing, and the lower side plate (30) for brace fixing with the overlapping width (H) (137) formed to be 12 mm, and further the above-mentioned the second steel column (12) of To sandwich and weld the ends of the first brace (33) and the second brace (34) in a sandwich-like manner at a position one-fourth from the upper end on the center line of the plate mounting surface (B) (40), the dimension of the side (M) (112) of the upper brace fixing plate (31) formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (P) (115) is 230 mm, the dimension of the side (O) (114) is 70 mm, the dimension of the steel column mounting portion (113) is formed to be 230 mm, the side (BB) (181) of the first brace (33) is abutted so as to contact the tip where the side (M) (112) and the side (P) (115) intersect, and the overlapping width (I) (138) of the overlapped side (BB) (181) is formed to be 69 mm for sandwiching and welding in an overlapping manner. Similarly, the overlapping width (J) (139) of the side (CC) (182) of the first brace (33) is formed to be 12 mm for sandwiching and welding in an overlapping manner. Further, the side (GG) (186) of the second brace (34) is abutted so as to contact the tip where the side (P) (115) and the side (O) (114) of the two upper brace fixing plates (31) formed in the same shape intersect, and the overlapping width (L) (141) of the overlapped side (GG) (186) is formed to be 75 mm for sandwiching and welding in an overlapping manner. Similarly, the overlapping width (K) (140) of the side (FF) (185) of the overlapped portion of the second brace (34) is formed to be 12 mm for sandwiching and welding. Further, to sandwich and weld the ends of the third brace (35) and the fourth brace (36) in a sandwich-like manner at a position one-fourth from the lower end on the center line of the plate mounting surface (B) (40) of the second steel column (12), the dimension of the side (Q) (116) of the lower brace fixing plate (32) formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (T) (119) is 230 mm, the dimension of the side (S) (118) is 70 mm, the dimension of the steel column mounting portion (117) is formed to be 230 mm, the side (JJ) (189) of the third brace (35) is abutted so as to contact the tip where the side (Q) (116) and the side (T) (119) intersect, and in a sandwich-like To perform butt welding by sandwiching and overlapping, the dimension of the overlapping width (M) (142) of the overlapping side (JJ) (189) is formed to be 75 mm. Similarly, to perform butt welding by sandwiching and overlapping in a sandwich shape, the dimension of the overlapping width (N) (143) of the side (KK) (190) of the third brace (35) is formed to be 13 mm. Further, the side (OO) (194) of the fourth brace (36) is brought into contact with the tip where the side (T) (119) and the side (S) (118) of the two lower side plates (32) for fixing the brace, which are formed in the same shape, intersect. To perform butt welding by sandwiching and overlapping in a sandwich shape, the dimension of the overlapping width (P) (145) of the overlapping side (OO) (194) is formed to be 69 mm. Similarly, to perform butt welding by sandwiching and overlapping in a sandwich shape, the dimension of the overlapping width (O) (144) of the side (NN) (193) of the overlapping part is formed to be 12 mm. The the first steel column (11) plate mounting surface (A) (41) a brace fixing upper end plate welded and joined to (28) and a brace fixing upper and lower central plate (29) and a brace fixing lower end plate (30) and, facing each other The the second steel column (12) plate mounting surface (B) (40) a brace fixing upper side plate welded and joined to (31) and a brace fixing lower side plate (32) to One side is 80 mm and the thickness is 2.3 mm Four formed of square rectangular steel pipes The first brace (33), the second brace (34), the third brace (35), the fourth brace (36) are characterized in that the ends are welded and joined in an M shape and .

Advantages of the Invention

[0013] According to the invention described in claim 1, in a seismic frame for seismic reinforcement of a building with a steel frame structure, Two square steel pipes of the same shape with one side being 100 mm, thickness being 4.5 mm, and length being 2257 mm are arranged in parallel at an interval of 700 mm. The first steel column (11) and the second steel column (12), and the the first steel column (11) of To perform butt welding to the upper end part (A) (70) of the steel column, an upper end end plate (51) with four bolt holes (60) formed at the four corners of a square flat steel plate with one side being 100 mm and thickness being 9 mm. Further, to the Four beam fixing nuts (72) for performing butt welding to the steel column mounting surface (A) (69) of the four bolt holes (60) formed on the upper end end plate (51). Further, to perform butt welding to the lower end part (A) (84) of the first steel column (11), a lower end end plate (48) with four bolt holes (81) formed at the four corners of a square flat steel plate with one side being 100 mm and thickness being 9 mm. Further, four beam fixing nuts (79) for performing butt welding to the steel column mounting surface (C) (80) of the four bolt holes (81) formed on the lower end end plate (48). The the second steel column (12) of In order to be welded and joined to the upper end portion (B) (78) of the steel column, a beam fixing plate (A) (38) having four bolt holes (61) formed at the four corners of a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a thickness of 9 mm, and further, in order to be welded and joined to the lower end portion (B) (88) of the steel column of the second steel column (12), a beam fixing plate (B) (42) having four bolt holes (62) formed at the four corners of a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a thickness of 9 mm, and the the first steel column (11) of The dimension of side (A) (100) of the trapezoidal upper end plate (28) with a thickness of 6 mm, which is formed for welding and joining by sandwiching and overlapping the end of the first brace (33) at the upper end on the center line of the plate mounting surface (A) (41), is 86 mm, the dimension of side (B) (101) is 90 mm, the angle (A) formed by the intersection of side (A) (100) and side (B) (101) is 239.8 degrees, the dimension of side (C) (102) is 70 mm, the angle formed by the intersection of side (B) (101) and side (C) (102) is 90 degrees, the dimension of the steel column mounting part (103) is 140 mm, the angle formed by the intersection of the steel column mounting part (103) and side (C) (102) is 90 degrees, and the angle (B) formed by the intersection of the steel column mounting part (103) and side (A) (100) is 300.Formed at 2 degrees, the overlapping width (A) (130) of the side (BB) (181) of the first brace (33) at the overlapping part for butt-welding in a sandwich-like manner against the side (A) (100) of two upper-end plates (28) for brace fixation with the same shape is formed to be 12 mm. Similarly, the overlapping width (B) (131) of the side (CC) (182) of the first brace (33) at the overlapping part for sandwich-like clamping and butt-welding is formed to be 55 mm. Further, for sandwich-like clamping and butt-welding the ends of the second brace (34) and the third brace (35) at the upper and lower central parts on the center line of the plate mounting surface (A) (41), the dimension of the side (E) (104) of the upper and lower central plate (29) for brace fixation formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (F) (105) is 230 mm, the dimension of the side (G) (106) is 70 mm. The dimension of the steel column mounting part (107) is formed to be 230 mm, and the steel column mounting part (107) is abutted against the upper and lower central parts of the plate mounting surface (A) (41) and butt-welded. Further, the side (FF) (185) of the second brace (34) is abutted against the tip where the side (E) (104) and the side (F) (105) of the upper and lower central plate (29) for brace fixation intersect, and the overlapping width (C) (132) for sandwich-like clamping and overlapping and butt-welding is formed to be 74 mm. Similarly, the overlapping width (D) (133) of the side (GG) (186) at the overlapping part for sandwich-like clamping and butt-welding is formed to be 13 mm. Further, the third brace is abutted against the tip where the side (F) (105) and the side (G) (106) of two upper and lower central plates (29) for brace fixation formed with the same shape intersect... (35) The side (KK) (190) is brought into contact, sandwiched in a sandwich shape and overlapped for welding, and the dimension of the overlapping width (F) (135) is formed to be 75 mm. Similarly, for sandwiching and welding, the dimension of the overlapping width (E) (134) of the side (JJ) (189) of the overlapped portion is formed to be 13 mm. Further, at the lower end portion on the center line of the plate mounting surface (A) (41), the end portion of the fourth brace (36) is overlapped and welded in a sandwich shape. Therefore, the lower end of the plate mounting surface (A) (41) is brought into contact with the tip where the side (K) (110) and the steel column mounting portion (111) intersect, and the steel column mounting portion (111) is welded to the plate mounting surface (A) (41). The dimension of the side (I) (108) of the lower end plate (30) for brace fixing thus configured is 70 mm, the dimension of the side (J) (109) is 90 mm, the angle at which the side (I) (108) and the side (J) (109) intersect is 90 degrees, the dimension of the side (K) (110) is 86 mm, the angle (C) at which the side (K) (110) and the side (J) (109) intersect is 234.5 degrees, the angle (D) at which the steel column mounting portion (111) and the side (K) (110) intersect is 305.5 degrees, the dimension of the steel column mounting portion (111) is formed to be 140 mm, the dimension of the overlapping width (G) (136) of the side (NN) (193) of the portion overlapped in a sandwich shape on two lower end plates (30) for brace fixing is formed to be 55 mm. Similarly, the overlapping width (H) (137) is a portion for abutting and welding the side (OO) (194) of the fourth brace (36) so as to overlap the side (K) (110) of the lower end plate (30) for brace fixing for sandwiching and welding. The lower side plate (30) for brace fixing with the dimension of the overlapping width (H) (137) formed to be 12 mm, and further the the second steel column (12) of To sandwich and weld the ends of the first brace (33) and the second brace (34) in a sandwich-like manner at a position one-fourth from the upper end on the center line of the plate mounting surface (B) (40), the dimension of the side (M) (112) of the upper plate (31) for brace fixing formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (P) (115) is 230 mm, the dimension of the side (O) (114) is 70 mm, the dimension of the steel column mounting portion (113) is formed to be 230 mm, the side (BB) (181) of the first brace (33) is abutted so as to contact the tip where the side (M) (112) and the side (P) (115) intersect, and the overlapping width (I) (138) of the overlapped side (BB) (181) is formed to be 69 mm for sandwiching and welding in an overlapping manner. Similarly, the overlapping width (J) (139) of the side (CC) (182) of the first brace (33) is formed to be 12 mm for sandwiching and welding in an overlapping manner. Further, the side (GG) (186) of the second brace (34) is abutted so as to contact the tip where the side (P) (115) and the side (O) (114) of the two upper plates (31) for brace fixing formed in the same shape intersect, and the overlapping width (L) (141) of the overlapped side (GG) (186) is formed to be 75 mm for sandwiching and welding in an overlapping manner. Similarly, the overlapping width (K) (140) of the side (FF) (185) of the overlapped portion of the second brace (34) is formed to be 12 mm for sandwiching and welding. Furthermore, to sandwich and weld the ends of the third brace (35) and the fourth brace (36) in a sandwich-like manner at a position one-fourth from the lower end on the center line of the plate mounting surface (B) (40) of the second steel column (12), The dimension of side (Q) (116) of the lower brace fixing plate (32) formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of side (T) (119) is 230 mm, the dimension of side (S) (118) is 70 mm. The dimension of the steel column mounting portion (117) is formed to be 230 mm. The side (JJ) (189) of the third brace (35) is abutted so as to be in contact with the tip where side (Q) (116) and side (T) (119) intersect, and the overlapping width (M) (142) of the overlapped side (JJ) (189) is formed to be 75 mm for sandwiching and overlapping and welding. Similarly, the overlapping width (N) (143) of side (KK) (190) of the third brace (35) is formed to be 13 mm for sandwiching and overlapping and welding. Further, the side (OO) (194) of the fourth brace (36) is abutted so as to be in contact with the tip where side (T) (119) and side (S) (118) of two lower brace fixing plates (32) formed in the same shape intersect, and the overlapping width (P) (145) of the overlapped side (OO) (194) is formed to be 69 mm for sandwiching and overlapping and welding. Similarly, the overlapping width (O) (144) of side (NN) (193) of the overlapped portion is formed to be 12 mm for sandwiching and welding. The the first steel column (11) plate mounting surface (A) (41) to the upper end plate for brace fixing welded and joined (28) and the upper and lower central plates for brace fixing (29) and the lower end plate for brace fixing (30) , and the The second steel column (12) plate mounting surface (B) (40) oppositely positioned (31) to the upper side plate for brace fixing welded and joined (32) and the lower side plate for brace fixing One side is 80 mm and the wall thickness is 2.3 mm Four formed of square rectangular steel pipes The first brace (33), the second brace (34), the third brace (35), the fourth brace (36) are welded and joined at their ends in an M shape, so that, compared with the conventionally generally used X-shaped seismic frames and K-shaped seismic frames, the lateral width of the seismic frame can be formed narrower, and therefore it becomes possible to increase the lateral width of the opening portions such as windows and entrances of the building.

Embodiment

[0016] Hereinafter, embodiments of the present invention will be described.

Modes for Carrying Out the Invention

[0017] Figs. 1 to 8 show embodiments of the present invention.

[0018] Figure 1 shows a steel structure 1 for constructing a building with a steel frame structure. It shows a plurality of anchor bolts 13 embedded and constructed at predetermined positions of the foundation concrete 14, a seismic-resistant M-shaped frame 5 for the first floor of the steel structure fixed to the anchor bolts 13, a seismic-resistant M-shaped frame 4 for the upper floors of the steel structure on the second floor, a seismic-resistant M-shaped frame 3 for the upper floors of the steel structure on the third floor, a seismic-resistant M-shaped frame 2 for the top floor of the steel structure on the fourth floor, an ALC wall panel 10 constituting the outer wall, a structural plywood 16 constituting the gable roof, an asphalt roofing 17 for waterproofing the roof, and a decorative slate 18 in a plan view.

[0019] Furthermore, the seismic-resistant M-shaped frame 15 for the upper floors of the steel structure on the second floor shown in Figure 1 is formed by horizontally inverting the seismic-resistant M-shaped frame 4 for the upper floors of the steel structure and has the same shape, and shows a state of being installed on the opposite side relative to the seismic-resistant M-shaped frame 4 for the upper floors of the steel structure on the second floor.

[0020] Figure 2 shows the seismic-resistant M-shaped frame 4 for the upper floors of the steel structure, the main beam (A) 6, the main beam (B) 7, the main beam (C) 8, and the main beam (D) 9 described in Figure 1 in a perspective view. The seismic-resistant M-shaped frame 4 for the upper floors of the steel structure includes two square steel pipes with a side length of 100 mm and a wall thickness of 4.5 mm arranged in parallel at an interval of 700 mm, namely, a first steel column 11 and a second steel column 12. Further, two brace fixing upper end plates 28 formed by flat steel plates in the shape of a trapezoid with the same shape and welded and joined to the upper end part on the center line of the plate mounting surface (A) 41 of the first steel column 11. Further, two Bra race fixing upper and lower center plates 29 formed by flat steel plates in the shape of a rectangle with the same shape and welded and joined to the upper and lower central parts on the center line of the plate mounting surface (A) 41. Further, two brace fixing lower end plates 30 formed by flat steel plates in the shape of a trapezoid with the same shape and welded and joined to the lower end part on the center line of the plate mounting surface (A) 41. Further, two brace fixing upper side plates 31 formed by flat steel plates in the shape of a rectangle with the same shape and welded and joined to the position one-fourth from the upper end on the center line of the plate mounting surface (B) 40 of the second steel column 12. Further, two brace fixing lower side plates 32 formed by flat steel plates in the shape of a rectangle with the same shape and welded and joined to the position one-fourth from the lower end on the center line of the plate mounting surface (B) 40. It is composed of these, and thus the firstofThe upper end plate 28 for brace fixing, the upper and lower central plates 29 for brace fixing, and the lower end plate 30 for brace fixing, which are welded and joined to the plate mounting surface (A) 41 of the steel column 11, and the upper plate 31 for brace fixing and the lower plate 32 for brace fixing, which are welded and joined to the plate mounting surface (B) 40 of the second steel column 12 located opposite, are welded and joined at the ends of four first braces 33, second braces 34, third braces 35, and fourth braces 36 formed of square steel pipes with a side of 80 mm and a wall thickness of 2.3 mm in an M shape. Further, an upper end plate 51 formed of a square flat steel plate with a vertical dimension of approximately 100 mm, a horizontal dimension of approximately 100 mm, and a thickness of 9 mm is welded and joined to the upper end of the first steel column 11. Further, a beam fixing plate (A) 38 formed of a rectangular flat steel plate with a vertical dimension of approximately 100 mm, a horizontal dimension of approximately 270 mm, and a thickness of 9 mm is welded and joined to the upper end of the second steel column 12. On the upper surfaces of the thus configured upper end plate 51 and the beam fixing plate (A) 38, the side surface of the end of the large beam (A) 6 formed of an H-shaped steel with a height dimension of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, and a web thickness of 5.5 mm, and the end of the large beam (B) 7 formed of an H-shaped steel having the same shape as the large beam (A) 6 are fixed at a right angle in an L shape with a gusset plate 25, bolts 26, and nuts (not shown). The lower flange (A) 46 of the large beam (A) 6 and the lower flange (B) 47 of the large beam (B) 7 are placed, and the large beam (A) 6, the large beam (B) 7, the first steel column 11, and the second steel column 12 are fixed with bolts 27 and 37. Further, a lower end plate 48 formed of a square flat steel plate with a vertical dimension of approximately 100 mm, a horizontal dimension of approximately 100 mm, and a thickness of 9 mm is welded and joined to the lower end of the first steel column 11. Further, a beam fixing plate (B) 42 formed of a rectangular flat steel plate with a vertical dimension of approximately 100 mm, a horizontal dimension of approximately 270 mm, and a thickness of 9 mm is welded and joined to the lower end of the second steel column 12. On the lower surfaces of the thus configured lower end plate 48 and the beam fixing plate (B) 42, the side surface of the end of the large beam (A) 6 formed of an H-shaped steel with a height dimension of 200 mm, a side dimension of 100 mm, a flange thickness of 8 mm, and a web thickness of 5.The state where the end side surface of the main beam (C) 8 formed of a 5 mm H-shaped steel and the end of the main beam (D) 9 formed of an H-shaped steel having the same shape as the main beam (C) 8 are fixed at a right angle in an L shape with a gusset plate 44, bolts 45, and nuts (not shown), and the upper flange (A) 49 of the main beam (C) 8 and the upper flange (B) 50 of the main beam (D) 9 are fixed with bolts 43 and bolts 83 (shown in Fig. 5) is shown.

[0021] Fig. 3 shows a perspective view of the perspective view described in Fig. 2 as seen generally from the opposite direction. A brace fixing upper end plate 28 formed of two trapezoidal flat steel plates having the same shape is welded and joined to the upper end portion on the center line of the plate mounting surface (A) 41 of the first steel column 11, and a brace fixing upper and lower center plate 29 formed of two rectangular flat steel plates is welded and joined to the upper and lower center portions on the center line of the plate mounting surface (A) 41. Further, a perspective view shows the state where a brace fixing lower end plate 30 formed of a trapezoidal flat steel plate having the same shape is welded and joined to the lower end portion on the center line of the plate mounting surface (A) 41.

[0022] Fig. 4 shows a perspective view of the state where the main beam (A) 6 and the main beam (B) 7 attached with bolts 27 and 37 to the upper part of the earthquake-resistant M-shaped frame 4 for the upper floor of the steel structure described in Fig. 2, and the main beam (C) 8 and the main beam (D) 9 attached with bolts 43 and 83 (shown in Fig. 5) to the lower part of the earthquake-resistant M-shaped frame 4 for the upper floor of the steel structure are excluded. By assembling the earthquake-resistant M-shaped frame 4 for the upper floor of the steel structure configured in this way using jigs at the factory, it has become possible to construct a steel structure with improved assembly accuracy.

[0023] FIG. 5 shows an exploded view of the seismic-resistant M-shaped frame 4 for the upper floor of the steel frame structure described in FIG. 2. To be welded to the upper end portion (A) 70 of the first steel column 11 formed of a square steel pipe with a side length of 100 mm, a wall thickness of 4.5 mm, and a length of 2257 mm, an upper end plate 51 formed of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm, and having four bolt holes 60 formed at approximately four corners; four beam fixing nuts 72 for welding and joining to the steel column mounting surface (A) 69 of the four bolt holes 60 formed in the upper end plate 51; two brace fixing upper end plates 28 formed of trapezoidal flat steel plates of the same shape and welded and joined to the upper ends on the center line of the plate mounting surface (A) 41 of the first steel column 11; two brace fixing upper and lower center plates 29 formed of rectangular flat steel plates of the same shape and welded and joined to the upper and lower central portions on the center line of the plate mounting surface (A) 41 of the first steel column 11; two brace fixing lower end plates 30 formed of trapezoidal flat steel plates of the same shape and welded and joined to the lower ends on the center line of the plate mounting surface (A) 41 of the first steel column 11; and a lower end plate 48 formed of a square flat steel plate with a side length of approximately 100 mm and a thickness of 9 mm, and having four bolt holes 81 formed at approximately four corners for welding and joining to the lower end portion (A) 84 of the first steel column 11, and four beam fixing for welding and joining to the steel column mounting surface (C) 80 of the four bolt holes 81 formed in the lower end plate 48 useA nut 79, and a beam fixing plate (A) 38 formed by a rectangular flat steel plate with a length of approximately 100 mm, a width of approximately 270 mm, and a thickness of 9 mm, having four bolt holes 61 formed at approximately four corners for welding and joining to the upper end portion (B) 78 of the second steel column 12 of the steel column; two upper braces fixing plates 31 formed by flat steel plates having the same rectangular shape for welding and joining at a position one-fourth from the upper end on the center line of the plate mounting surface (B) 40 of the second steel column 12; two lower braces fixing plates 32 formed by flat steel plates having the same rectangular shape for welding and joining at a position one-fourth from the lower end on the center line of the plate mounting surface (B) 40 of the second steel column 12; and a beam fixing plate (B) 42 formed by a rectangular flat steel plate with a length of approximately 100 mm, a width of approximately 270 mm, and a thickness of 9 mm, having four bolt holes 62 formed at approximately four corners for welding and joining to the lower end portion (B) 88 of the second steel column 12 of the steel column are shown.

[0024] Furthermore, in FIG. 5, in order to fix the first steel column 11 with the upper end plate 51 welded thereto to the lower flange (A) 46 of the girder (A) 6 formed of H-shaped steel, four bolt holes 66 are formed at positions on the lower flange (A) 46 of the girder (A) 6 corresponding to the four bolt holes 60 formed in the upper end plate 51. Bolts 66 and beam fixing nuts 72 for attaching the lower flange (A) 46 of the girder (A) 6 to the first steel column 11 are shown. Similarly, four bolt holes 75 are formed at positions on the lower flange (B) 47 of the girder (B) 7 corresponding to the four bolt holes 61 formed in the beam fixing plate (A) 38 of the second steel column 12. Bolts 37 and nuts 76 for attaching the girder (B) 7 to the second steel column 12 are shown. Furthermore, as described with reference to FIG. 2, in order to fix the first steel column 11 with the lower end plate 48 welded thereto and the second steel column 12 with the beam fixing plate (B) 42 welded thereto to the upper flange (A) 49 of the girder (C) 8 and the upper flange (B) 50 of the girder (D) 9 formed of H-shaped steel, four bolt holes 82 are formed at positions on the upper flange (A) 49 of the girder (C) 8 corresponding to the four bolt holes 81 formed in the lower end plate 48. Bolts 83 and beam fixing nuts 79 for fixing the girder (C) 8 to the lower end plate 48 welded to the lower end portion (A) 84 of the first steel column 11 are shown. Similarly, four bolt holes 87 are formed at positions on the upper flange (B) 50 of the girder (D) 9 corresponding to the four bolt holes 62 formed in the beam fixing plate (B) 42. Bolts 43 and nuts 91 for fixing the girder (D) 9 to the beam fixing plate (B) 42 welded to the lower end portion (B) 88 of the second steel column 12 are shown.

[0025] FIG. 6 shows a front view of the earthquake-resistant M-shaped frame 4 for the upper floor of the steel structure described in FIG. 2. FIGS. 6a to 6e show enlarged views of the upper end plate 28 for brace fixing, the upper and lower center plates 29 for brace fixing, the lower end plate 30 for brace fixing welded to the plate mounting surface (A) 41 of the first steel column 11, the upper plate 31 for brace fixing, and the lower plate 32 for brace fixing welded to the plate mounting surface (B) 40 of the second steel column 12.

[0026] Figure 6a shows the first steel column 11 in dotted lines and the upper end plate 28 for brace fixing welded to the plate mounting surface (A) 41 at the upper end of the first steel column 11 in solid lines. The upper end plate 28 for brace fixing is composed of two trapezoidal plates with a thickness of 6 mm and the same shape for sandwiching and fixing the ends of the first brace 33 formed of a square steel pipe with a side length of 80 mm and a wall thickness of 2.3 mm to the first steel column 11. It is arranged such that the tip where side (A) 100 intersects with the steel column mounting portion 103 touches the upper end of the plate mounting surface (A) 41, and the steel column mounting portion 103 is welded to the plate mounting surface (A) 41. The dimension of side (A) 100 of the upper end plate 28 for brace fixing is approximately 86 mm, the dimension of side (B) 101 is approximately 90 mm, and the angle A where side (A) 100 intersects with side (B) 101 is approximately 239.8 degrees. The dimension of side (C) 102 is approximately 70 mm, the angle where side (B) 101 intersects with side (C) 102 is 90 degrees, the dimension of the steel column mounting portion 103 is approximately 140 mm, the angle where the steel column mounting portion 103 intersects with side (C) 102 is 90 degrees, and the angle B where the steel column mounting portion 103 intersects with side (A) 100 is approximately 300.2 degrees.

[0027] Figure 6b shows the first steel column 11 in dotted lines and the upper and lower central plate 29 for brace fixing welded to the plate mounting surface (A) 41 at the upper and lower central part of the first steel column 11 in solid lines. The upper and lower central plate 29 for brace fixing is composed of two rectangular plates with a thickness of 6 mm and the same shape for sandwiching and fixing the ends of the second brace 34 and the third brace 35 formed of a square steel pipe with a side length of 80 mm and a wall thickness of 2.3 mm to the first steel column 11. The dimension of side (E) 104 is approximately 70 mm, the dimension of side (F) 105 is approximately 230 mm, the dimension of side (G) 106 is approximately 70 mm, and the dimension of the steel column mounting portion 107 is approximately 230 mm, showing a state where the upper and lower central parts of the steel column mounting portion 107 are abutted against the upper and lower central part of the plate mounting surface (A) 41 and welded.

[0028] Figure 6c shows the first steel column 11 in dotted lines, and shows the lower end brace fixing plate 30 welded and joined to the plate mounting surface (A) 41 at the lower end of the first steel column 11 in solid lines. The lower end brace fixing plate 30 is composed of two trapezoidal plates with the same shape and a thickness of 6 mm, which are used to sandwich and fix the ends of the fourth brace 36 formed of a square steel pipe with a side length of 80 mm and a wall thickness of 2.3 mm to fix to the first steel column 11. It is arranged such that the tip where the side (K) 110 intersects with the steel column mounting portion 111 contacts the lower end of the plate mounting surface (A) 41, and the steel column mounting portion 111 is welded and joined to the plate mounting surface (A) 41. The dimension of the side (I) 108 of the lower end brace fixing plate 30 is about 70 mm, the dimension of the side (J) 109 is about 90 mm, the angle where the side (I) 108 intersects with the side (J) 109 is 90 degrees, the dimension of the side (K) 110 is about 86 mm, the angle where the side (K) 110 intersects with the side (J) 109 is about 234.5 degrees, the angle D where the steel column mounting portion 111 intersects with the side (K) 110 is about 305.5 degrees, and the dimension of the steel column mounting portion 111 is about 140 mm.

[0029] Figure 6d shows the second steel column 12 in dotted lines, and shows the upper side brace fixing plate 31 welded and joined to the plate mounting surface (B) 40 at one-fourth from the upper end of the second steel column 12 in solid lines. The upper side brace fixing plate 31 is composed of two rectangular plates with the same shape and a thickness of 6 mm, which are used to sandwich and fix the ends of the first brace 33 and the second brace 34 formed of a square steel pipe with a side length of 80 mm and a wall thickness of 2.3 mm to fix to the second steel column 12. The dimension of the side (M) 112 is about 70 mm, the dimension of the side (P) 115 is about 230 mm, the dimension of the side (O) 114 is about 70 mm, the dimension of the steel column mounting portion 113 is about 230 mm, and it shows a state where the upper and lower central part of the steel column mounting portion 113 is brought into contact and welded and joined at a position one-fourth from the upper end of the plate mounting surface (B) 40.

[0030] FIG. 6e shows the second steel column 12 in a dotted line, and shows the lower brace fixing plate 32 welded and joined to the quarter plate mounting surface (B) 40 from the lower end of the second steel column 12 in a solid line. The lower brace fixing plate 32 is composed of two rectangular plates with the same shape and a thickness of 6 mm for sandwiching and fixing the ends of the third brace 35 and the fourth brace 36 formed of a square steel pipe with a side length of 80 mm and a wall thickness of 2.3 mm to the second steel column 12. The dimension of side (Q) 116 is about 70 mm, the dimension of side (T) 119 is about 230 mm, the dimension of side (S) 118 is about 70 mm, and the dimension of the steel column mounting portion 117 is about 230 mm. It shows a state where the upper and lower central portions of the steel column mounting portion 117 are brought into contact with and welded to the quarter position from the lower end of the plate mounting surface (B) 40.

[0031] FIG. 7 shows the seismic-resistant M-shaped frame 4 for the upper floor of the steel structure described in FIG. 4 in a front view, and FIGS. 7a to 7e show, in an enlarged view, the upper end brace fixing plate 28, the upper and lower central brace fixing plate 29, the lower end brace fixing plate 30 welded and joined to the plate mounting surface (A) 41 of the first steel column 11, the first brace 33, the second brace 34, the third brace 35, the fourth brace 36, and further the upper brace fixing plate 31, the lower brace fixing plate 32 welded and joined to the plate mounting surface (B) 40 of the second steel column 12, and the first brace 33, the second brace 34, the third brace 35, the fourth brace 36 welded and joined thereto.

[0032] FIG. 7a shows, in a dotted line, a state where the end of the first brace 33 is sandwiched between two upper end brace fixing plates 28 formed in the same shape. The overlapping width (A) 130 is the overlapping portion for abutting and welding the side (BB) 181 (shown in FIG. 8) of the first brace 33 against the side (A) 100 (shown in FIG. 6a) of the upper end brace fixing plate 28, and the dimension of the overlapping width (A) 130 is about 12 mm. Similarly, the overlapping width (B) 131 is the overlapping portion for sandwiching and welding the first brace 33 between two upper end brace fixing plates 28, and the dimension of the overlapping width (B) 131 shown in a dotted line is about 55 mm.

[0033] Figure 7b shows, in dotted lines, the state where the ends of the second brace 34 and the third brace 35 are sandwiched and fixed between two upper and lower central plates 29 for brace fixing formed in the same shape. The overlapping width (C) 132 is arranged so that the side (FF) 185 of the second brace 34 (shown in FIG. 8) contacts the tip where the side (E) 104 and the side (F) 105 described in FIG. 6b intersect, and is the overlapped portion for sandwiching and welding together with two upper and lower central plates 29 for brace fixing formed in the same shape. The dimension of the overlapping width (C) 132 shown by the dotted line is about 74 mm. Similarly, the overlapping width (D) 133 is the overlapped portion for sandwiching and welding the side (GG) 186 of the second brace 34 (shown in FIG. 8) with two upper and lower central plates 29 for brace fixing, and the dimension of the overlapping width (D) 133 shown by the dotted line is about 13 mm. Further, the overlapping width (E) 134 is the overlapped portion for sandwiching and welding the side (JJ) 189 of the third brace 35 (shown in FIG. 8) with two upper and lower central plates 29 for brace fixing, and the dimension of the overlapping width (E) 134 shown by the dotted line is about 13 mm. Similarly, the overlapping width (F) 135 is arranged so that the side (KK) 190 of the third brace 35 (shown in FIG. 8) contacts the tip where the side (F) 105 and the side (G) 106 described in FIG. 6b intersect, and is the overlapped portion for sandwiching and welding together with two upper and lower central plates 29 for brace fixing formed in the same shape. The dimension of the overlapping width (F) 135 shown by the dotted line is about 75 mm.

[0034] FIG. 7c shows in dotted lines the state in which the end portion of the fourth brace 36 is sandwiched between two lower end plates 30 for brace fixation formed in the same shape. The overlapping width (G) 136 is the portion where the end portion of the fourth brace 36 is overlapped and welded by being sandwiched between two lower end plates 30 for brace fixation. The overlapping width (G) 136 is the portion where the side (NN) 193 of the fourth brace 36 (shown in FIG. 8) is overlapped and welded by being sandwiched between two lower end plates 30 for brace fixation. The dimension of the overlapping width (G) 136 shown by the dotted line is about 55 mm. Similarly, the overlapping width (H) 137 is the portion where the side (OO) 194 of the fourth brace 36 (shown in FIG. 8) is abutted and welded so as to overlap with the side (K) 110 of the lower end plate 30 for brace fixation (shown in FIG. 6c). The dimension of the overlapping width (H) 137 is about 12 mm.

[0035] Figure 7d shows, in dotted lines, the state where the ends of the first brace 33 and the second brace 34 are sandwiched between two upper plates 31 for brace fixation formed in the same shape. The overlapping width (I) 138 is arranged so that the side (BB) 181 of the first brace 33 (shown in FIG. 8) contacts the tip where the side (M) 112 and the side (P) 115 described in FIG. 6d intersect. It is the overlapped part for sandwiching and welding together with two upper plates 31 for brace fixation formed in the same shape. The dimension of the overlapping width (I) 138 shown by the dotted line is about 69 mm. Similarly, the overlapping width (J) 139 is the overlapped part for sandwiching and welding the side (CC) 182 of the first brace 33 (shown in FIG. 8) with two upper plates 31 for brace fixation in a sandwich shape. The dimension of the overlapping width (J) 139 shown by the dotted line is about 12 mm. Further, the overlapping width (K) 140 is the overlapped part for sandwiching and welding the side (FF) 185 of the second brace 34 (shown in FIG. 8) with two upper plates 31 for brace fixation in a sandwich shape. The dimension of the overlapping width (K) 140 shown by the dotted line is about 13 mm. Similarly, the overlapping width (L) 141 is arranged so that the side (GG) 186 of the second brace 34 (shown in FIG. 8) contacts the tip where the side (P) 115 and the side (O) 114 described in FIG. 6d intersect. It is the overlapped part for sandwiching and welding together with two upper plates 31 for brace fixation formed in the same shape. The dimension of the overlapping width (L) 141 shown by the dotted line is about 75 mm.

[0036] Figure 7e shows, in dotted lines, the state where the ends of the third brace 35 and the fourth brace 36 are sandwiched between two lower plates 32 for brace fixation formed in the same shape. The overlap width (M) 142 is arranged to contact the tip where the side (JJ) 189 of the third brace 35 (shown in Figure 8) intersects with the sides (Q) 116 and (T) 119 described in Figure 6e. It is the overlapping part for sandwiching and welding together with two lower plates 32 for brace fixation formed in the same shape. The dimension of the overlap width (M) 142 shown in dotted lines is approximately 75 mm. Similarly, the overlap width (N) 143 is the overlapping part for sandwiching and welding the side (KK) 190 of the third brace 35 (shown in Figure 8) with two lower plates 32 for brace fixation. The dimension of the overlap width (N) 143 shown in dotted lines is approximately 13 mm. Furthermore, the overlap width (O) 144 is the overlapping part for sandwiching and welding the side (NN) 193 of the fourth brace 36 (shown in Figure 8) with two lower plates 32 for brace fixation. The dimension of the overlap width (O) 144 shown in dotted lines is approximately 12 mm. Similarly, the overlap width (P) 145 is arranged to contact the tip where the side (OO) 194 of the fourth brace 36 (shown in Figure 8) intersects with the sides (S) 118 and (T) 119 described in Figure 6e. It is the overlapping part for sandwiching and welding together with two lower plates 32 for brace fixation formed in the same shape. The dimension of the overlap width (P) 145 shown in dotted lines is approximately 69 mm.

[0037] Furthermore, the welding parts (A) 146, (B) 148, (C) 156, (D) 150, (E) 152, (F) 158, (G) 160, (H) 154 in Figure 7 indicate the positions for welding and fixing the first brace 33, the second brace 34, the third brace 35, and the fourth brace 36 to two upper end plates 28 for brace fixation, the upper and lower central plates 29 for brace fixation, the lower end plates 30 for brace fixation, the upper plates 31 for brace fixation, and the lower plates 32 for brace fixation, respectively.

[0038] FIG. 8 is a front view showing a disassembled state of a first steel column 11, a second steel column 12, an upper end plate 28 for brace fixing, an upper and lower center plate 29 for brace fixing, a lower end plate 30 for brace fixing, an upper side plate 31 for brace fixing, a lower side plate 32 for brace fixing, a first brace 33, a second brace 34, a third brace 35, and a fourth brace 36 of the seismic-resistant M-shaped frame 4 for the upper floor of the steel frame structure described in FIG. 7. The first brace 33 is formed of a square steel pipe with a side length of 80 mm, a wall thickness of 2.3 mm, and a length of about 769 mm, and both ends are welded and joined at an angle of about 35.5 degrees with respect to the horizontal direction as shown by an angle E to the upper end plate 28 for brace fixing and the upper side plate 31 for brace fixing. Similarly, the second brace 34 is formed of a square steel pipe with a side length of 80 mm, a wall thickness of 2.3 mm, and a length of about 797 mm, and both ends are welded and joined at an angle of about 37.9 degrees with respect to the horizontal direction as shown by an angle F to the upper side plate 31 for brace fixing and the upper and lower center plate 29 for brace fixing. Similarly, the third brace 35 is formed of a square steel pipe with a side length of 80 mm, a wall thickness of 2.3 mm, and a length of about 797 mm, and both ends are welded and joined at an angle of about 37.9 degrees with respect to the horizontal direction as shown by an angle G to the upper and lower center plate 29 for brace fixing and the lower side plate 32 for brace fixing. Similarly, the fourth brace 36 is formed of a square steel pipe with a side length of 80 mm, a wall thickness of 2.3 mm, and a length of about 769 mm, and both ends are welded and joined at an angle of about 35.5 degrees with respect to the horizontal direction as shown by an angle H to the lower side plate 32 for brace fixing and the lower end plate 30 for brace fixing.

[0039] As described above, based on the embodiments, the seismic-resistant M-shaped frame for the upper floor of the steel frame structure according to the present invention has been described in detail. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention, and of course, they belong to the technical scope of the present invention.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Explanation of Reference Numerals

[0041] A Angle B Angle C Angle D Angle E Angle F Angle G Angle H Angle 1 Steel Frame Structure 2 Earthquake-Resistant M-Shaped Frame for the Top Floor of the Steel Frame Structure 3 Earthquake-Resistant M-Shaped Frame for the Upper Floor of the Steel Frame Structure 4 Earthquake-Resistant M-Shaped Frame for the Upper Floor of the Steel Frame Structure 5 Earthquake-Resistant M-Shaped Frame for the First Floor of the Steel Frame Structure 6 Girder (A) 7 Girder (B) 8 Girder (C) 9 Girder (D) 10 ALC Wall Panel 11 First Steel Column 12 Second steel column 13 Anchor bolt 14 Foundation concrete 15 Seismic-resistant M-shaped frame for upper floor of steel structure 16 Structural plywood 17 Asphalt roofing 18 Decorative slate 19 First steel column 20 Second steel column 21 First steel column 22 Second steel column 23 First steel column 24 Second steel column 25 Gusset plate 26 Bolt 27 Bolt 28 Upper end plate for brace fixing 29 Upper and lower central plates for brace fixing 30 Lower end plate for brace fixing 31 Upper side plate for brace fixing 32 Lower side plate for brace fixing 33 First brace 34 Second brace 35 Third brace 36 Fourth brace 37 Bolt 38 Beam fixing plate (A) 40 Plate mounting surface (B) 41 Plate mounting surface (A) 42 Beam fixing plate (B) 43 Bolt 44 Gusset plate 45 Bolt 46 Lower flange of main beam (A) 47 Lower flange of main beam (B) 48 Lower end plate 49 Upper flange of main beam (A) 50 Upper flange of main beam (B) 51 Upper end plate 60 Bolt hole 61 Bolt hole 62 bolt holes 66 bolt holes 68 main girder mounting surface (A) 69 steel column mounting surface (A) 70 upper end of steel column (A) 72 nut for beam fixing 73 main girder mounting surface (B) 75 bolt holes 76 nut 77 steel column mounting surface (B) 78 upper end of steel column (B) 79 nut for beam fixing 80 steel column mounting surface (C) 81 bolt holes 82 bolt holes 83 bolt 84 lower end of steel column (A) 85 main girder mounting surface (A) 87 bolt holes 88 lower end of steel column (B) 89 steel column mounting surface (D) 90 main girder mounting surface (B) 91 nut 100 side (A) 101 side (B) 102 side (C) 103 steel column mounting part 104 side (E) 105 side (F) 106 side (G) 107 steel column mounting part 108 side (I) 109 side (J) 110 side (K) 111 steel column mounting part 112 side (M) 113 steel column mounting part 114 side (O) 115 side (P) 116 side (Q) 117 steel column mounting part 118 side (S) 119 side (T) 130 overlapping width (A) 131 overlapping 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 Weld part (A) 147 Intersection point (A) 148 Weld part (B) 149 Intersection point (B) 150 Weld part (D) 151 Intersection point (D) 152 Weld part (E) 153 Intersection point (E) 154 Weld part (H) 155 Intersection point (H) 156 Weld part (C) 157 Intersection point (C) 158 Weld part (F) 159 Intersection point (F) 160 Weld part (G) 161 Intersection point (G) 180 Side (AA) 181 Side (BB) 182 Side (CC) 183 Side (DD) 184 Side (EE) 185 Side (FF) 186 Side (GG) 187 Side (HH) 188 Side (II) 189 Side (JJ) 190 Side (KK) 191 Side (LL) 192 Side (MM) 193 Side (NN) 194 sides (OO) 195 sides (PP)

Claims

【Claim 1】 In a seismic frame for seismic strengthening of a building with a steel frame structure, a first steel column (11) and a second steel column (12), each being two square steel pipes of the same shape with a side length of 100 mm, a wall thickness of 4.5 mm, and a length of 2257 mm, arranged in parallel at an interval of 700 mm; an upper end plate (51) formed with four bolt holes (60) at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm for welding and joining to the upper end part (A) (70) of the steel column of the first steel column (11), and further four nut for beam fixing (72) for welding and joining to the steel column mounting surface (A) (69) of the four bolt holes (60) formed in the upper end plate (51), and further, for welding and joining to the lower end part (A) (84) of the steel column of the first steel column (11), a lower end plate (48) formed with four bolt holes (81) at the four corners of a square flat steel plate with a side length of 100 mm and a thickness of 9 mm, and further four nut for beam fixing (79) for welding and joining to the steel column mounting surface (C) (80) of the four bolt holes (81) formed in the lower end plate (48); a plate for beam fixing (A) (38) formed with four bolt holes (61) at the four corners of a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a wall thickness of 9 mm for welding and joining to the upper end part (B) (78) of the steel column of the second steel column (12), and further, a plate for beam fixing (B) (42) formed with four bolt holes (62) at the four corners of a rectangular flat steel plate with a length of 100 mm, a width of 270 mm, and a wall thickness of 9 mm for welding and joining to the lower end part (B) (88) of the steel column of the second steel column (12); The upper end portion plate (28) for brace fixing, which is trapezoidal with a thickness of 6 mm and is formed for sandwiching and welding the end portion of the first brace (33) so as to overlap on the center line of the plate mounting surface (A) (41) of the first steel column (11). The dimension of side (A) (100) is 86 mm, the dimension of side (B) (101) is 90 mm, the angle (A) where side (A) (100) and side (B) (101) intersect is formed at 239.8 degrees, the dimension of side (C) (102) is 70 mm, the angle where side (B) (101) and side (C) (102) intersect is 90 degrees, the dimension of the steel column mounting portion (103) is 140 mm, the angle where the steel column mounting portion (103) and side (C) (102) intersect is 90 degrees, and the angle (B) where the steel column mounting portion (103) and side (A) (100) intersect is formed at 300.2 degrees. The overlapping width (A) (130) of side (BB) (181) of the first brace (33) at the overlapping portion where two upper end portion plates (28) for brace fixing with the same shape are overlapped in a sandwich manner for welding is formed with a dimension of 12 mm. Similarly, the overlapping width (B) (131) of side (CC) (182) of the first brace (33) at the overlapping portion where it is overlapped for sandwiching and welding is formed with a dimension of 55 mm. Further, at the upper and lower central portions on the center line of the plate mounting surface (A) (41), in order to sandwich and weld the end portions of the second brace (34) and the third brace (35) in a sandwich manner, the brace fixing upper and lower central portion plate (29) formed of a rectangular plate with a thickness of 6 mm has the dimension of side (E) (104) as 70 mm, the dimension of side (F) (105) as 230 mm, the dimension of side (G) (106) as 70 mm, and the dimension of the steel column mounting portion (107) is formed at 230 mm and the steel column mounting portion (107) is abutted and welded to the upper and lower central portions of the plate mounting surface (A) (41). Further, side (FF) (185) of the second brace (34) is abutted so as to contact the tip portion where side (E) (104) and side (F) (105) of the brace fixing upper and lower central portion plate (29) intersect, and the overlapping width (C) (132) for sandwiching and overlapping for welding is formed with a dimension of 74 mm. Similarly, the overlapping width (D) (133) of side (GG) (186) at the overlapping portion for sandwiching and welding is formed with a dimension of 13 mm.Further, the side (KK) (190) of the third brace (35) is brought into contact with the tip where the sides (F) (105) and (G) (106) of the two upper and lower central plates (29) for brace fixing formed in the same shape intersect, and the dimension of the overlapping width (F) (135) for sandwiching and overlapping and welding and joining is formed to be 75 mm. Similarly, the dimension of the overlapping width (E) (134) of the side (JJ) (189) of the overlapped portion for sandwiching and welding and joining is formed to be 13 mm. Further, at the lower end portion on the center line of the plate mounting surface (A) (41), the end portion of the fourth brace (36) is overlapped and welded in a sandwiching manner. Therefore, the tip where the side (K) (110) and the steel column mounting portion (111) intersect is brought into contact with the lower end of the plate mounting surface (A) (41), and the steel column mounting portion (111) is welded and joined to the plate mounting surface (A) (41). The dimension of the side (I) (108) of the lower end plate (30) for brace fixing configured in this way is 70 mm, the dimension of the side (J) (109) is 90 mm, the angle at which the side (I) (108) and the side (J) (109) intersect is 90 degrees, the dimension of the side (K) (110) is 86 mm, the angle (C) at which the side (K) (110) and the side (J) (109) intersect is 234.5 degrees, the angle (D) at which the steel column mounting portion (111) and the side (K) (110) intersect is 305.5 degrees, the dimension of the steel column mounting portion (111) is formed to be 140 mm, the dimension of the overlapping width (G) (136) of the side (NN) (193) of the portion overlapped in a sandwiching manner on the two lower end plates (30) for brace fixing is formed to be 55 mm. Similarly, the overlapping width (H) (137) is a portion for bringing the side (OO) (194) of the fourth brace (36) into contact with and overlapping the side (K) (110) of the lower end plate (30) for brace fixing for sandwiching and welding and joining, and the dimension of the overlapping width (H) (137) is formed to be 12 mm. The lower side plate (30) for brace fixing, Furthermore, in order to sandwich and weld-join the ends of the first brace (33) and the second brace (34) in a sandwich-like manner at a position one-fourth from the upper end on the center line of the plate mounting surface (B)(40) of the second steel column (12), the dimension of the side (M)(112) of the upper plate (31) for brace fixing formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (P)(115) is 230 mm, the dimension of the side (O)(114) is 70 mm, the dimension of the steel column mounting portion (113) is formed to be 230 mm, the side (BB)(181) of the first brace (33) is brought into contact with the tip where the side (M)(112) and the side (P)(115) intersect, and the overlapping width (I)(138) of the overlapped side (BB)(181) is formed to be 69 mm for sandwiching and welding-joining in a sandwich-like manner. Similarly, the overlapping width (J)(139) of the side (CC)(182) of the first brace (33) is formed to be 12 mm for sandwiching and welding-joining in a sandwich-like manner. Furthermore, the side (GG)(186) of the second brace (34) is brought into contact with the tip where the side (P)(115) and the side (O)(114) of the two upper plates (31) for brace fixing formed in the same shape intersect, and the overlapping width (L)(141) of the overlapped side (GG)(186) is formed to be 75 mm for sandwiching and welding-joining in a sandwich-like manner. Similarly, the overlapping width (K)(140) of the side (FF)(185) of the overlapped portion of the second brace (34) is formed to be 12 mm for sandwiching and welding-joining in a sandwich-like manner. Furthermore, in order to sandwich and weld-join the ends of the third brace (35) and the fourth brace (36) in a sandwich-like manner at a position one-fourth from the lower end on the center line of the plate mounting surface (B)(40) of the second steel column (12), the dimension of the side (Q)(116) of the lower plate (32) for brace fixing formed of a rectangular plate with a thickness of 6 mm is 70 mm, the dimension of the side (T)(119) is 230 mm, the dimension of the side (S)(118) is 70 mm, the steel column mounting portion (1The dimension of (17) is formed to be 230 mm, and the side (JJ) (189) of the third brace (35) is brought into contact with the tip where the side (Q) (116) and the side (T) (119) intersect, and the overlapping width (M) (142) of the overlapped side (JJ) (189) is formed to be 75 mm for sandwiching and overlapping and welding. Similarly, the overlapping width (N) (143) of the side (KK) (190) of the third brace (35) is formed to be 13 mm for sandwiching and overlapping and welding. Further, the side (OO) (194) of the fourth brace (36) is brought into contact with the tip where the side (T) (119) and the side (S) (118) of the two lower plates (32) for fixing the brace, which are formed in the same shape, intersect, and the overlapping width (P) (145) of the overlapped side (OO) (194) is formed to be 69 mm for sandwiching and overlapping and welding. Similarly, the overlapping width (O) (144) of the side (NN) (193) of the overlapped part is formed to be 12 mm for sandwiching and welding. An upper end plate for brace fixing (28), an upper and lower central plate for brace fixing (29), and a lower end plate for brace fixing (30) welded and joined to the plate mounting surface (A) (41) of the first steel column (11), and an upper plate for brace fixing (31) and a lower plate for brace fixing (32) welded and joined to the plate mounting surface (B) (40) of the second steel column (12) facing each other, and the ends of four first braces (33), second braces (34), third braces (35), and fourth braces (36) formed of square steel pipes with a side length of 80 mm and a wall thickness of 2.3 mm are welded and joined in an M shape. A seismic M-shaped frame for the upper floor of a steel frame structure, characterized in that.

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