JP5487735B2 - Beam-column joint - Google Patents

Description

  The present invention relates to a beam-to-column connection portion made of a thin and light steel structure, and more particularly to a beam having an H-shaped or C-shaped cross section and a column-beam connection portion suitable for a column.

  In the case of a beam-column joint made of a lightweight steel structure, it is generally performed to secure predetermined rigidity and proof strength by reinforcing columns and beams around the joint with stiffeners, ribs, and the like.

  FIG. 2 shows an example of a beam-column joint made of a lightweight steel structure. A beam 1 having an H-shaped or C-shaped cross section is bolted to the column 1 by a mounting bracket 4 and a stiffener 7. 8 is extended between the upper and lower flanges 22 of the beam 2 so as to be along the column axis direction of the column 1, and is reinforced by the mounting bracket 4. The rib 8 is fastened with bolts to the pedestal 41 of the mounting bracket 4 at the upper and lower ends, and the mounting bracket 4 also serves as a mounting bracket for connecting the brace 3 to the joining auxiliary plate 42 forming a part thereof.

  As another method of reinforcing the beam-column joint, a method has been proposed in which troublesome welding is omitted and a long bolt is inserted between the upper and lower flanges of the beam to fix a stiffener, a rib, or the like to the beam. .

  Patent Document 1 relates to a long-tightening high-strength bolt joint structure of a steel pipe column and a joint metal, etc. In a structure composed of a square steel pipe column and an H-shaped steel beam, T-shaped hardware is fastened with a long-tightening high-strength bolt on both left and right sides of the column It has been proposed to reduce the construction burden by joining the beams to the hardware and to secure the strength of the joints.

  Patent Document 2 relates to a column beam joint having excellent workability, and has a bolt hole so as to face the beam end on the column side across the column in a structure composed of a square steel pipe column and an H-shaped steel beam. It has been proposed to reduce the construction burden by welding end plates and fastening the end plates with long bolts.

  Patent Document 3 relates to a joining method of a reinforced concrete column (RC column) and a steel beam (S beam), and joins end plates having bolt holes to beam flanges at both ends of the column, and between the end plates. We have proposed an easy-to-install joint that is fixed with a long bolt that penetrates through.

  Patent Document 4 relates to a column-beam rigid joint structure in which H-shaped steel is used as a column and a beam. A stiffener having pipe sleeps with both ends inscribed in the upper and lower flanges is fixed between both flanges of the column. By connecting the upper and lower flanges with long bolts that pass through the pipe sleeper, the rigidity of the beam-column joint is improved, and a highly rigid joint that does not require welding is realized.

JP 2004-107992 A JP 2001-152551 A Japanese Patent Laid-Open No. 10-219831 JP-A-2-229339

  In the case of the beam-column joint structure shown in FIG. 2, the rigidity of these regions is locally improved at the portion where the mounting bracket is in contact with the flange of the column or beam. Therefore, when it is pulled from the brace, the beam flange around the mounting bracket causes local buckling at an early stage, and the yield strength decreases.

  In addition, Patent Documents 1 to 4 all deal with heavy steel frames. When applied to thin and light steel structures, Patent Documents 1 and 2 indicate that when a load is generated on a beam or a column, local seats are quickly introduced. Bending occurs and sufficient rigidity is difficult to obtain.

  In Patent Document 3, concrete filling is indispensable and the welding process of ribs and stiffeners is eased, but the construction period is longer than that in the case where a column beam joint is constructed only by hardware and bolt joining. In Patent Document 4, in order to bear the load from the beams at both ends of the column, a stiffener is inserted which is fastened with a long bolt across the column flange. It is difficult to obtain sufficient rigidity.

  Therefore, an object of the present invention is to propose a thin and light steel-framed H-shaped or C-shaped cross-section beam and a column beam joint using columns, which are highly rigid and easy to construct.

The object of the present invention can be achieved by the following means. The present invention is directed to a beam having an H-shaped or C-shaped cross section.
1. In a thin and light steel column beam structure with braces attached, a beam having an H-shaped or C-shaped cross section and a column beam connection portion of the column, the column being vertically connected to the upper and lower flanges of the beam It is fixed with hardware such that the column axes coincide, and the hardware is bolted to the side surface and the outer surface of the upper and lower flanges at each of the opposing side surfaces of the column, and among the hardware, the hardware that also serves as a brace fixing jig is A long fastening bolt having male screw portions at both ends is inserted between the upper and lower flanges, and a fastening nut is screwed onto the male screw of the long fastening bolt protruding from the hardware contacting the outer surface of the upper and lower flanges. is bolted to the outer surface of the flange, at least one web region web of the beam is interposed between the hardware so as not buckled on at least one of the inner and outer surfaces of the beam web Column Joints, characterized in that the cover, reinforcing plate is bolted with a height and width of approximately the hardware serving as the inner dimension of the substantially vertical flanges.
2. The metal fitting also used as the brace fixing jig is fastened between a fastening nut screwed to the male screw of the long fastening bolt and an internal nut screwed to the shaft portion which becomes the inner surface side of the flange of the beam by the long fastening bolt. 2. The beam-column joint according to 1, wherein

  According to the present invention, when a brace is arranged as a damping or seismic element in a column beam structure, the force from the brace is distributed to the upper and lower flanges of the beam. Will improve. In addition, local buckling due to the vertical load generated on the beam web is prevented, and it is easy to construct a thin and light steel beam with high rigidity and strength without using welding, and column beam connection with columns. Part is obtained and is very useful in industry.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the state seen from the cross section of a beam, (b) is a figure which shows the state seen from the side, (c) is a figure which shows the state seen from the side, The figure which shows the state seen from the cross section. Conventional example (structure in which ribs are welded to the web of the beam to reinforce the column beam joint).

  The present invention relates to a thin and light steel-framed beam-to-column joint using a beam and a column, in which a metal fitting for fixing the column to each of the upper and lower flanges of the beam is fastened with a long fastening bolt, and a steel plate is attached to the web of the beam The purpose is to realize a column beam joint with high rigidity and strength without welding ribs and stiffeners by buckling and stiffening. Hereinafter, the present invention will be described in detail with reference to the drawings.

  1A and 1B are views showing a column beam joint according to an embodiment of the present invention. FIG. 1A is a diagram showing a state seen from a cross section of the beam, FIG. 1B is a diagram showing a state seen from a side, ) Is a diagram showing a state viewed from the cross section of the column. In these figures, 1 is a column, 2 is a beam, 3 is a brace, 4 is a hardware that also serves as a fixing jig of the brace 3, 4a is a hardware for a stiffener, 5 Is a fastening bolt, 6 is a reinforcing plate, 9 is a fastening nut, 10 is an internal nut, 21 is a web, 22 is a beam flange, 41 is a flange of a metal piece 4 and a contact portion with the beam flange 22, and 42 is in the metal piece 4 A joint portion 43 of the brace 3 is a flange of the hardware 4 and indicates a contact portion to the column 1.

  In the illustrated beam-to-column joint, the column 1 is fixed by the hardware 4 and the hardware 4a so that the column axes of the upper and lower columns coincide with the upper and lower beam flanges 22 of the beam 2, respectively.

  The hardware 4 and the hardware 4 a are bolted to both the side surface and the outer surface of the beam flange 22 on each of the opposing side surfaces of the column 1. The hardware 4 that also serves as a brace fixing jig for fixing the brace 3 to the beam-to-column joint via the auxiliary joining plate 42 is in contact with the side surface of the column 1 and is externally attached to the flange 43 and the beam flange 22 that are bolted together. And a flange 41 to be bolted.

  The metal piece 4a is fixed between the other side surface of the column 1 and the beam flange 22, and has a flange 43 to be bolted and a flange 41 to be bolted to the outer surface of the beam flange 22 and abutted against the side surface. Then, the flange 43 and the flange 41 are connected by an oblique material and act as the stiffener 7.

  In the column beam joint according to the present invention, the flange 41 of the hardware 4 is fastened to the upper and lower beam flanges 22 of the beam by the long bolts 5. The long fastening bolt 5 is inserted between the upper and lower beam flanges 22 so that the male screw portions provided on both end sides of the shaft portion protrude from the flange 41 of the hardware 4 that contacts the upper and lower beam flanges 22.

The flange 41 of the hardware 4 is fixed to the outer surface of the beam flange 22 above (below) the beam by screwing the fastening nut 9 into the male thread portion of the long bolt 5. Assuming that the male threaded portion of the long fastening bolt 5 has such a length that the inner nut 10 can be attached on the inner surface side of the beam flange 22, the upper (lower) beam flange 22 is connected to the fastening nut 9 at the end of the long fastening bolt 5. Since it is fastened between the nuts 10, the rigidity is further improved, which is preferable.

When the upper and lower beam flanges 22 are fastened between the fastening nuts 9 and the inner nuts 10 at both ends of the long fastening bolt 5, a reinforcing plate is provided on at least one of the inner and outer surfaces of the web 21 so that the web 21 of the beam 2 does not buckle. 6 is attached. It is preferable that the inner dimension of the substantially beam 2 and the width length of the flange 41 of the substantially metal object 4 are set. The reinforcing plate 6 is fixed to the web 21 with bolts.

  In the present invention, the number of long fastening bolts 5 is not particularly limited, but the greater the number, the more the rigidity is improved. In the case of the beam 2 having an H-shaped cross section, it is desirable to attach a plurality of bolts with the web 21 interposed therebetween. In the present invention, as in the case of the hardware 4, it is possible to fasten the bolts with the long fastening bolts 5 between the flanges of the hardware 4 a contacting the upper and lower flanges 22 of the beam 2.

  In the present invention, the column 1 has a square steel pipe of □ 75 × 75 × 3.2 (mm), the beam 2 has an H-shaped steel of H250 × 100 × 4.5 × 4.5 (mm), and the flange 41 of the metal piece 4 has a plate thickness of 12 mm. It is applicable to.

1 Pillar 2 Beam 3 Brace 4, 4a Hardware 5 Long fastening bolt 6 Reinforcement plate 9 Fastening nut 10 Internal nut 21 Web 22 Beam flange 41, 43 Flange 42 Joining auxiliary plate

Claims (2)

In a thin and light steel column beam structure with braces attached, a beam having an H-shaped or C-shaped cross section and a column beam connection portion of the column, the column being vertically connected to the upper and lower flanges of the beam It is fixed with hardware such that the column axes coincide, and the hardware is bolted to the side surface and the outer surface of the upper and lower flanges at each of the opposing side surfaces of the column, and among the hardware, the hardware that also serves as a brace fixing jig is A long fastening bolt having male screw portions at both ends is inserted between the upper and lower flanges, and a fastening nut is screwed onto the male screw of the long fastening bolt protruding from the hardware contacting the outer surface of the upper and lower flanges. is bolted to the outer surface of the flange, at least one web region web of the beam is interposed between the hardware so as not buckled on at least one of the inner and outer surfaces of the beam web Column Joints, characterized in that the cover, reinforcing plate is bolted with a height and width of approximately the hardware serving as the inner dimension of the substantially vertical flanges. The metal fitting also used as the brace fixing jig is fastened between a fastening nut screwed to the male screw of the long fastening bolt and an internal nut screwed to the shaft portion which becomes the inner surface side of the flange of the beam by the long fastening bolt. The beam-column joint according to claim 1, wherein:

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