JP6441011B2 - Steel structure - Google Patents

Description

  The present invention relates to a joining structure of steel frames in which one end is joined to a fixed structure such as a column or a beam in a building such as a distribution warehouse or a factory.

  As shown in FIGS. 8 and 9, a building 20 such as a distribution warehouse or a factory is often provided with a long bowl 22 above an opening 21 for carrying in / out goods and raw materials. . In this type of eaves 22, for example, a plurality of large beams 1 fixed to a pillar 23 are provided so as to protrude to the outdoor side, and a plurality of small beams 2 are provided between the large beams 1. A brazing material 24 made of a folded plate or the like is attached. The brazing member 24 is attached to the lower side of the large beam 1 and the small beam 2 in consideration of water stoppage of the brazing member 24 and the like. It is for providing.

  Such a long rod 22 joins the large beam 1 and the small beam 2 because the continuously arranged small beam 2 extends due to a temperature rise due to solar radiation and a great force is applied to the joint portion with the large beam 1. Deformation, damage, etc. may occur in the steel frame, bolts, gusset plates, etc. In particular, when the brazing material 24 is attached to the lower side of the large beam 1 and the small beam 2, since the small beam 2 is directly subjected to solar radiation, the temperature rise is remarkable, and the above deformation and damage become more remarkable.

JP 7-062762 A Japanese Patent Laid-Open No. 7-062763 Japanese Patent Laid-Open No. 7-071079

  Generally, in buildings 20 such as distribution warehouses and factories, high strength bolts (HTB) are used for joining steel frames such as columns and beams. The same applies to the joint between the large beam 1 and the small beam 2 in the flange 22. The joint with high strength bolts has a strong joint strength, so even if the small beam 2 expands due to temperature rise due to solar radiation, no slip occurs between the large beam 1 and the small beam 2 along the bolt hole consisting of a long hole, and it is movable. May not function as a joint. In this case, the same row of small beams 2 between the large beams 1 in the entire rod 22 behaves as if it were one continuous beam, and the overall elongation is large. For example, in fine weather, it extends about 30 mm with a 100-meter ridge 22. For this reason, deformation and damage of the steel frame, the bolt, the gusset plate, etc. at the portion where the large beam 1 and the small beam 2 are joined are unavoidable.

  In addition, if a medium bolt is used instead of a high-strength bolt for joining the large beam 1 and the small beam 2 in the rod 22, it can always function as a movable joint. Proper use of bolts is not realistic because it causes confusion at the site. Further, if the rod 22 is divided into a plurality of portions in the longitudinal direction, the extension of the small beam 2 is dispersed to reduce the influence on the steel frame, bolt, gusset plate, etc. at the portion where the large beam 1 and the small beam 2 are joined. In this case, however, two large beams 1 are required in each divided portion, and the number of members of the flange 22 increases, resulting in an increase in cost.

  In Patent Documents 1 and 2, in order to prevent the frame from being greatly deformed due to the thermal expansion of the beam due to a fire or the like, a gap is provided in the adjacent frame section, and both frame sections are connected by an extendable joint plate. Thus, a fireproof structure for a building that absorbs the thermal elongation of the beams in both housing sections is disclosed. However, although this structure absorbs thermal elongation between two adjacent housing sections, rigidity in a direction perpendicular to the direction of thermal elongation, for example, vertical direction is not ensured. In addition, the same problem as described above also occurs in the joint between the large beam and the column.

  An object of the present invention is to provide a steel structure that can absorb the expansion and contraction even when the steel frame expands and contracts due to a temperature change, and can secure rigidity and bonding strength in a direction perpendicular to the longitudinal direction of the steel frame. Is to provide.

The basic structure of the steel joint structure of the present invention is a joint structure in which one end of a steel frame is joined to a fixed structure, and a steel joint is provided on the fixed structure, and the metal joint is fixed to the fixed structure. A pair of vertical plates arranged at intervals in the structure in a predetermined direction, and a deformation-permissible plate provided between the steel plate side end edges of both vertical plates and not directly joined to the fixed structure; And one end of the steel frame is joined to the deformation allowing plate.
For example, the member to which the steel frame of the fixed structure is joined is a steel beam or column, and the steel frame is a beam. In this case, the predetermined direction is a longitudinal direction of a beam or a column which is a constituent member of the fixed structure.

  According to this configuration, since one end of the steel frame is joined to the deformation allowance plate, when the steel frame expands and contracts in the longitudinal direction due to temperature change, the deformation allowance plate of the joint hardware bends and deforms in the longitudinal direction of the steel frame to expand and contract the steel frame. To absorb. The shearing force in the direction perpendicular to the longitudinal direction of the steel frame acting on the steel frame due to its own weight or wind is transmitted to the fixed structure through the deformation-allowing plate and the pair of vertical plates of the joint metal. Further, since the shear force is evenly transmitted to the pair of vertical plates, a large shear strength can be obtained.

In the basic configuration , the deformation-permitting plate of the metal joint has a central joint plate in a standing posture projecting in the longitudinal direction of the steel frame from an intermediate position in the width direction that is the predetermined direction, and the steel frame is the central joint It is good that it is joined to the board.
In this case, one end of the steel frame can be reasonably joined to the intermediate position in the predetermined direction on the deformation allowing plate.

This invention, in the basic configuration, the deformable plate of the joining hardware, the deformable plate of the joining hardware is that has a cut-out hole for reduced rigidity on both sides of the steel.
If the deformation-permitting plate has a cutout hole for reducing rigidity, the deformation-permitting plate is easily bent and deformed in the longitudinal direction of the steel frame with respect to the expansion and contraction of the steel frame. Further, if the cutout holes for lowering rigidity are located on both sides of the steel frame, the rigidity in the out-of-plane direction (direction perpendicular to the front and back surfaces of the deformation-permitting plate), that is, the deformation-permitting plate can be easily bent and deformed. It is the same level on both sides of the steel frame.

Junction structure of the first steel of the invention, in the basic configuration, the deformable the cut-out hole set only to plate, which is the portion excluding the cut-out hole of the deformable plate of the joining hardware, portion between adjacent said cut-out hole, and a portion between the outer peripheral edge of the deformable plate and the cut-out holes you to form a truss structure.
By making the truss structure the part of the permissible plate excluding the cutout hole, adjusting the out-of-plane rigidity, while maintaining a large shear strength, the in-plane direction (parallel to the front and back surfaces of the permissible plate) Direction).

Bonding structure of the second steel of this invention, in the basic configuration, the deformable plate to the cut-out hole set only the one end of the steel is joined to a center of the predetermined direction of the deformable plate, the steel The longitudinal direction is perpendicular to the deformation-permitting plate, and the cutout holes located on both sides of the steel frame are two right-angled triangles formed so that the hypotenuses face each other, and sandwich the steel frame in that is formed symmetrically.
Since one end of the steel frame is joined to the center in the predetermined direction of the deformation allowance plate and the longitudinal direction of the steel frame is perpendicular to the deformation allowance plate, bending deformation of the deformation allowance plate occurs symmetrically across the steel frame. For this reason, a large amount of bending deformation can be obtained as compared with the case where one end of the steel frame is joined to a portion where the deformation permissible plate is biased. Further, when the cutout hole has the shape and arrangement of the right triangle, it is possible to realize a truss structure that secures a large shear strength in the in-plane direction while effectively reducing the rigidity in the out-of-plane direction.

  The structure for joining steel frames according to the present invention is a joining structure for joining one end of a steel frame to a fixed structure, and a metal fitting for joining steel frames is provided on the fixed structure, and the metal fitting is attached to the fixed structure. A pair of vertical plates arranged at intervals in a predetermined direction, and a deformation-permissible plate that is provided between the tip edges on the steel frame side of both vertical plates and is not directly joined to the fixed structure, Since one end of the steel frame is joined to the deformation allowing plate, even if the steel frame expands and contracts due to temperature change, the expansion and contraction can be absorbed, and the rigidity and joint strength in the direction perpendicular to the longitudinal direction of the steel frame Can be secured

(A) is a partially omitted front view of a steel joint structure according to an embodiment of the present invention, (B) is a partially broken plan view thereof, and (C) is a side view thereof. It is a disassembled perspective view of the joining structure of the same steel frame. It is a top view of two examples of the metal fitting used for the joining structure of the same steel frame. It is explanatory drawing of the force which acts on each part of the joining structure of the same steel frame. It is the figure which represented typically the structure of the deformation | transformation tolerance board of the joining metal fitting. It is the figure which represented typically the structure of a different deformation | transformation permission board. Furthermore, it is a front view of a different deformation | transformation permission board. It is a perspective view of the building provided with the eaves. It is a fracture side view of the building.

An embodiment of the present invention will be described with reference to FIGS.
This steel-framed joint structure is applied, for example, to a joint between the large beam 1 and the small beam 2 that support the brazing material 24 in a cage 22 of a building 20 such as a distribution warehouse or a factory as shown in FIGS. The The girder 1 is fixed to the column 23 and is provided so as to protrude to the outdoor side. The small beam 2 is provided by joining both ends between a pair of large beams 1. The large beam 1 is a constituent member that is a part of the “fixed structure” in the claims, and the small beam 2 is the “steel frame” in the claims.

  FIG. 1 is a partially omitted front view, a partially broken plan view, and a side view of a steel joint structure according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the joint structure. The large beam 1 which is a constituent member of the fixed structure is made of H-section steel or the like, and is installed with the web portion 1a facing in the vertical direction. The small beam 2, which is a steel frame, is made of, for example, an H-shaped steel having a size smaller than that of the large beam 1, is installed with the web portion 2 a directed in the vertical direction, and one end is abutted against the large beam 1. In FIG. 1 (A), the illustration of the small beam 2 is omitted, and in FIG. 1 (B), a part of the large beam 1 is shown broken away.

  A joining hardware 3 is used for joining the large beam 1 and the small beam 2. The metal joint 3 is provided with a deformation allowance provided between a pair of vertical plates 4 arranged at intervals in a predetermined direction and perpendicular to the predetermined direction, and the distal edges of both vertical plates 4 on the small beam 2 side. A plate 5 and a central joining plate 6 projecting from an intermediate position of the deformation allowing plate 5 in a predetermined direction to the side opposite to the side where the vertical plate 4 is located. The deformation allowing plate 5 is not directly joined to the large beam 1. The vertical plate 4, the deformation allowing plate 5 and the central joining plate 6 are all made of steel plates. Here, the “predetermined direction” is a longitudinal direction of the large beam 1 in a state where the large beam 1 and the small beam 2 are joined. In the joined state of the large beam 1 and the small beam 2, the deformation allowing plate 5 is in a posture perpendicular to the longitudinal direction of the small beam 2.

  The pair of vertical plates 4 and the deformation allowing plate 5 may be fixed to each other by welding as shown in FIG. 3 (A), or may be fixed to each other via the angle member 7 as shown in FIG. 3 (B). . In the illustrated example, the angle member 7 is fixed to the vertical plate 4 by welding in advance, and the angle member 7 and the deformation-permitting plate 5 are fixed to each other with a high-strength bolt 8 at the construction site. 3A and 3B, the deformation allowing plate 5 and the central joining plate 6 are fixed by welding. The configuration of FIG. 3 (A) has the advantage that less work on site is required, and the configuration of FIG. 3 (B) has the advantage of being convenient for transportation without being bulky.

  The deformation allowing plate 5 is provided with a plurality of rigidity-reducing cutout holes 10A to 10D. Two cutout holes 10 </ b> A to 10 </ b> D are provided on each side of the portion where the central joining plate 6 is joined. That is, in a state where one end of the small beam 2 is fixed to the central joint plate 6 as described later, the cutout holes 10A and 10B are located on the left side of the small beam 2 and the cutout holes 10C and 10D are located on the right side. Each of the cutout holes 10A to 10D is a right triangle, the left cutout holes 10A and 10B are formed so that the oblique sides inclined downward to the right face each other, and the right cutout holes 10C and 10D are opposed to the oblique sides inclined downward to the left. It is formed to do. Further, the cutout holes 10A and 10B on one side and the cutout holes 10C and 10D on the other side are formed symmetrically with the small beam 2 in between.

  The deformation permissible plate 5 provided with the cutout holes 10A to 10D is a portion between the cutout holes 10A to 10D and the outer peripheral edge of the deformation permissible plate 5, in other words, portions 5a, 5b, 5c, 5d along the outer peripheral edge, And it is comprised by the part 5e, 5f, 5g between adjacent cutout hole 10A-10D. The portion 5e between the cut-out holes 10A and 10B and the portion 5g between the cut-out holes 10C and 10D face oblique directions having different inclination directions, and the portion 5f between the cut-out holes 10A and 10C is a direction perpendicular to the longitudinal direction (specifically In the vertical direction).

  When this configuration is schematically shown, a truss structure as shown in FIG. 5 is formed. Although this truss structure is provided with the cutout holes 10A to 10D (FIG. 1), it has low rigidity with respect to bending in the out-of-plane direction (direction orthogonal to the front and back surfaces of the deformation-permitting plate 5). The structure has a large rigidity against a shearing force (in a direction parallel to the front and back surfaces of the deformation-permitting plate 5). In particular, by forming the cutout holes 10A to 10D as right triangles and forming the portion 5f facing the vertical direction as in this example, a large shear strength (specifically, while reducing the out-of-plane rigidity effectively) A truss structure that ensures vertical rigidity) can be realized. The rigidity in the out-of-plane direction can be adjusted by changing the size and arrangement of the cutout holes 10A to 10D.

  The metal joint 3 fixes the base end edges of the pair of vertical plates 4 to the web portion 1a of the large beam 1 by welding, and the upper and lower end edges of the pair of vertical plates 4 to the upper and lower flange portions 1b of the large beam 1, respectively. It is fixed to the large beam 1 by being fixed by welding. In this state, the deformation allowing plate 5 is located outside the outer end of the flange portion 1 b of the large beam 1. Then, the web portion 2 a of the small beam 2 is fixed to the central joining plate 6 with a high-strength bolt 11.

  A reinforcing vertical plate 12 is fixed to the opposite side of the pair of vertical plates 4 of the metal joint 3 with the web portion 1a of the large beam 1 interposed therebetween. As with the vertical plate 4, the reinforcing vertical plate 12 has a base edge fixed to the web portion 1 a of the large beam 1 by welding, and upper and lower ends are fixed to the upper and lower flange portions 1 b of the large beam 1 by welding. , Fixed to the girder 1.

The effect | action of the joining structure of this steel frame is demonstrated with FIG.
When the beam 2 rises in temperature due to solar radiation or the like and extends in the longitudinal direction, the pushing force F <b> 1 acts on the deformable plate 5 of the metal joint 3. As a result, the deformation allowing plate 5 is bent and deformed in the longitudinal direction of the small beam 2 (the out-of-plane direction of the deformation allowing plate 5) as indicated by an imaginary line, thereby absorbing the elongation deformation of the small beam 2. Since the cutout holes 10A to 10D are provided in the deformation allowance plate 5 to reduce the bending rigidity, the deformation allowance plate 5 is easily bent and deformed. Since the deformation permission plate 5 is positioned outside the outer end of the flange portion 1b of the large beam 1, even if the deformation permission plate 5 is bent and deformed, it does not interfere with the flange portion 1b. In addition, when the small beam 2 contracts during cold weather or the like, the deformation allowing plate 5 is bent and deformed in the direction opposite to the imaginary line.

  A vertical shearing force F <b> 2 acting on the small beam 2 by its own weight or wind is transmitted to the large beam 1 via the deformation-permitting plate 5 and the pair of vertical plates 4 of the metal joint 3. Regarding the deformation-permitting plate 5, a reaction force P3 against the shearing force F2 mainly acts on the oblique portions 5e and 5g. One end of the small beam 2 is joined to the middle of the longitudinal direction of the large beam 1 in the deformation-permitting plate 5, and bending deformation of the deformation-permitting plate 5 occurs symmetrically across the small beam 2, so that one end of the small beam 2 is deformed. A large amount of bending deformation can be obtained as compared with the case where the plate is joined to the biased portion of the allowable plate 5. Further, since the shearing force is evenly transmitted to the pair of vertical plates 4, a large shear strength can be obtained.

  As described above, this steel frame joining structure can absorb the expansion and contraction even if the beam 2 expands and contracts due to a temperature change or the like, and is perpendicular to the longitudinal direction of the beam 2, for example, in the vertical direction. Since rigidity can be secured, deformation of the steel frame at the part where the large beam 1 and the small beam 2 are joined by applying to a long warehouse 22 such as a distribution warehouse or a factory that is easily affected by temperature changes due to solar radiation, Bolt breakage, gusset plate breakage, and the like can be prevented.

  In this embodiment, the member to which the steel frame of the fixed structure is joined is the large beam 1 and the steel frame is the small beam 2. However, the member to which the steel frame of the fixed structure is joined is a steel column. The steel frame may be a beam such as a large beam. The member to which the steel frame of the fixed structure is connected may be, for example, a foundation or a wall, and the steel frame may be a steel frame other than a beam as long as one end is joined to the fixed structure. . The deformation allowing plate 5 may have a truss structure shown in FIG.

  Moreover, although the cutout holes 10A-10D provided in the deformation | transformation permission board 5 are right-angled triangles, the joining metal fitting 3 of this embodiment may be shapes other than that. For example, the cutout holes 10A to 10D may be circular as shown in FIG. Also in this case, the deformation allowing plate 5 has a truss structure.

1 ... Large beam (part of fixed structure)
2 ... Small beam (steel frame)
3 ... Connection hardware 4 ... Vertical plate 5 ... Deformation allowance plate 6 ... Central joining plate 10A-10D ... Cut-out hole

Claims (4)

A joining structure for joining one end of a steel frame to a fixed structure,
A metal fitting for joining steel frames is provided on the fixed structure,
The metal fitting is provided between a pair of vertical plates arranged on the fixed structure with a gap in a predetermined direction and between the vertical edges of the vertical plates of the two vertical plates, and is not directly connected to the fixed structure. It consists of a deformable plate that is a joint,
One end of the steel frame is joined to the deformation allowing plate ,
The deformation allowance plate of the metal joint has adjacently lowering cutout holes for reducing rigidity on both sides of the steel frame, and is a portion excluding the cutout hole of the deformation allowance plate of the metal joint. A steel frame joining structure in which a portion between the cutout holes and a portion between the cutout holes and the outer peripheral edge of the deformation-permitting plate form a truss structure. A joining structure for joining one end of a steel frame to a fixed structure,
A metal fitting for joining steel frames is provided on the fixed structure,
The metal fitting is provided between a pair of vertical plates arranged on the fixed structure with a gap in a predetermined direction and between the vertical edges of the vertical plates of the two vertical plates, and is not directly connected to the fixed structure. It consists of a deformable plate that is a joint,
One end of the steel frame is joined to the deformation allowing plate,
The deformation allowance plate of the joint metal has cutout holes for lowering rigidity on both sides of the steel frame, and one end of the steel frame is joined to the center of the deformation allowance plate in the predetermined direction. The direction is perpendicular to the deformation-permitting plate, and the cutout holes located on both sides of the steel frame are two right-angled triangles formed so that the hypotenuses face each other, and symmetrical with respect to the steel frame Steel structure that is formed into a shape. The steel structure according to claim 1 or 2 , wherein a member to which the steel frame of the fixed structure is joined is a steel beam or column, and the steel frame is a beam. 4. The steel-frame joining structure according to claim 1 , wherein the deformation-accepting plate of the joint hardware projects in a longitudinal direction of the steel frame from an intermediate position in a width direction that is the predetermined direction. 5. A steel structure having a central joint plate in a standing posture, wherein the steel frame is joined to the central joint plate.

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