JPH09273250A - Joint structure of brace in steel house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a bearing force and deformation performance of a brace without deforming a horizontal frame or a vertical frame by transmitting a tensile force acting on the brace directly to an anchor bolt and a beam. SOLUTION: A rectangular frame body is formed by joining an upper horizontal frame material 4, a lower horizontal frame material 1 and a vertical frame material 2 made of a sheet steel, and a brace 4 is provided at the rectangular frame body. In this structure, a lower connection fitting 20 is fixed to the lower end of the brace 4, and the lower connection fitting 20 is joined to an anchor bolt 8 embedded in a base integrally with the lower horizontal frame material 1. Also, an upper connection fitting 23 is fixed to the upper end of the brace 4, and the upper connection fitting 23 is fixed to a beam 17 together with the upper horizontal frame material 3. Therefore, a tensile force acting on the brace 4 is directly transmitted to the anchor bolt 8 and the beam 17, and a bearing force and deformation performance of the brace 4 can be exerted without deforming the vertical frame material 2 or the horizontal frame materials 1 and 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stiff joint structure in a steel house.

[0002]

2. Description of the Related Art Conventionally, in a structure such as a steel house using a bent thin steel plate as a frame material, the joint structure at the upper and lower ends of the streaks is shown in FIGS.
What is shown in 4 is general.

FIG. 23 shows a lower end corner portion of a rectangular frame body in which a lower horizontal frame member 1 and a lower end portion of a vertical frame member 2 are joined, and FIG. 24 similarly shows an upper end portion of the vertical frame member 2. And upper horizontal frame material 3
The upper end corner part of the rectangular frame fixed to FIG. In FIG. 23, the lower end portion of the band-shaped streaks 4 extends toward the lower end corner portion of the rectangular frame body and is joined to the frame material, and in FIG. 24, the streak portion 4 moves toward the upper end corner portion of the rectangular frame body. The upper end extends and is joined to the frame material.

In FIG. 23, each of the lower horizontal frame member 1, the upper horizontal frame member 3, and the vertical frame member 2 has a thickness of 0.6 mm to 1. mm.
It is formed by bending one thin steel plate in the range of 6 mm into a U-shape by roll forming to enhance its strength, and has a web 5 and flanges 6 at both ends of the web 5. There is.

In FIG. 23, the bolt holes formed in the web 5 of the lower horizontal frame member 1 are fitted into the anchor bolts 8 which are planted in the foundation 7 and which stand upright, and the upper surface of the web 5 will be described later. The lower horizontal frame member 1 is fixed to the foundation 7 by screwing the nut 10 onto the threaded portion of the anchor bolt 8 protruding through the hole-down hardware 11.

Both side flanges 6 at the lower end of the vertical frame member 2 are put inside the flange 6 which rises above the lower horizontal frame member 1, and a hole-down hardware 11 is provided inside the joint portion of both frame members 1 and 2. One of the contact portions 12 of the hole-down hardware 11 extending in the direction perpendicular to each other is applied to the inner surface of the web of the vertical frame member 2, and a drilling tapping screw 13 is screwed into the overlapping portion to form the hole-down hardware 11. The vertical frame members 2 are joined together.

Further, the other contact portion 14 of the hole-down hardware 11 is superposed on the upper surface of the web 5 of the lower horizontal frame member 1, and the anchor bolt 8 is passed through the hole formed in each member to contact the contact portion 14. Nut 1 from the upper side of the
The hole down hardware 11 and the lower horizontal frame member 1 are joined by screwing 0, and the lower horizontal frame member 1 and the vertical frame member 2 are thus coupled via the hole down hardware 11.

Further, as shown in FIGS. 23 and 24, upper and lower gusset plates 15 and 16 having a substantially rectangular plate shape are fixed to the lower end portion and the upper end portion of the braces 4 by drilling tapping screws 13. The gusset plate 15 at the lower end of the horizontal streak has the drilling tapping screw 13 on each of the flanges 6 and 6 of the lower horizontal frame member 1 and the vertical frame member 2.
It is fixed to the lower horizontal frame member 1 and the vertical frame member 2 at the same time by screwing into.

Further, the upper gusset plate 1 having a streak 4
6 is an upper horizontal frame member 3 fixed to the lower surface of a beam 17 made of C-shaped steel, and flanges 6 and 6 of a vertical frame member 2 having an upper end joined to the upper horizontal frame member 3, and a drilling tapping screw. 1
3 is fixed.

In the conventional structure, as shown in FIG. 23, when the tensile force of the bracing 4 of the steel house is transmitted to the anchor bolt 8 in the event of an earthquake, the tensile force is first transmitted through the lower gusset plate 15 to which the bracing 4 is attached. After being transmitted to the vertical frame member 2 and the lower horizontal frame member 1, it is transmitted to the anchor bolt 8 via the hole-down hardware 11.

Further, in the case of FIG. 24, the tensile force of the bracing 4 is transmitted to the upper horizontal frame member 3 via the upper gusset plate 16 at the upper end thereof, and then to the beam 17 via the upper horizontal frame member 3. Is transmitted.

[0012]

As described above, the conventional method is to transmit the tensile force of the braces 4 to the anchor bolts 8 and the beams 17 via the vertical frame member 2 and the upper and lower horizontal frame members 3 and 1, respectively. However, in this method, there is a problem in that the tensile force of the streaks deforms the vertical frame member 2 formed by bending the thin steel plate and the upper and lower horizontal frame members 3, 1. In particular, when the vertical frame member 2 is deformed, the proof stress for supporting the weight of the upper part of the building is sharply reduced, which leads to the collapse of the building. Further, there is a problem that the deformation of the rectangular frame of the vertical frame member 2 and the upper and lower horizontal frame members 3, 1 destroys the interior and exterior wall materials attached to these frame members.

It is an object of the present invention to provide a bracing structure for a steel house, which has the above-mentioned drawbacks improved.

[0014]

In order to achieve the above object, the present invention forms a rectangular frame body by joining upper and lower horizontal frame members and vertical frame members made of thin steel plates. In the structure in which the braces are provided, a lower connecting fitting is fixed to the lower end portion of the bracing, and the lower connecting fitting is joined to an anchor bolt that is integrally planted with the lower horizontal frame member in the foundation. Further, the present invention forms a rectangular frame body by joining the upper and lower horizontal frame members and vertical frame members made of thin steel plates, and in a structure in which the rectangular frame body is provided with braces, an upper connection is made at the upper end of the braces. The metal fitting is fixed, and the upper connecting metal fitting is fixed to the beam together with the upper horizontal frame member.

According to the present invention, the tensile force applied to the upper and lower portions of the striations is directly transmitted to the beam and the anchor bolt and is not transmitted to the upper and lower horizontal frame members and the vertical frame members. The frame material will not be broken or deformed by the tensile force of the striation.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the joint structure of the upper and lower streaks of the braces according to the first example of the present invention. In each drawing, the cross-sectional structures of the upper and lower horizontal frame members 3 and 1, the vertical frame member 2 and the braces 4 are the same as those shown in FIGS. 23 and 24. In other words, these are formed of thin steel plates with a thickness of 0.6 mm to 1.6 mm.
It is configured by cutting the thin steel plate into a strip having a predetermined size. The upper and lower horizontal frame members 3, 1 are formed by bending the thin steel plate having a predetermined width into a U shape by roll forming.

Further, in the present invention, the conventional hole-down hardware 11 is not used, but the flange 6 at the lower end of the vertical frame member 2 is inserted inside the flange 6 of the lower horizontal frame member 1, and the respective flanges 6, 6. Drilling tapping screw 13 on the overlapping part of 6
The vertical frame member 2 and the lower horizontal frame member 1 are fixed to each other by screwing. The upper end of the vertical frame member 2 shown in FIGS. 3 and 4 and the upper horizontal frame member 3 are fixed to each other by the same structure as the lower connecting structure. The one side bolt 18 shown in FIG. 9 is used as a means for joining the upper horizontal frame member 3 to the lower surface of the beam 17.

Further, at the lower end of the braces 4, the vertical portion 2 of the lower connecting fitting 20 formed by bending a steel plate into a substantially L-shaped cross section.
1 are connected by a drilling tapping screw 13. Further, the horizontal portion 22 of the lower connecting fitting 20 is applied to the upper surface of the web 5 of the lower horizontal frame member 1, and the protruding portion of the anchor bolt 8 planted in the foundation 7 is connected to the web 5 and the horizontal portion 22.
The lower connecting fitting 20 is fixed to the foundation 7 by the anchor bolt 8 by inserting the nut 10 into the threaded portion of the anchor bolt 8 on the upper surface of the horizontal portion 22 by inserting the nut 10 into the bolt hole formed in.

Further, a side surface of an upper connecting fitting 23 formed by cutting a steel plate into a rectangular shape is connected to an upper end portion of the streak 4 by a drilling tapping screw 13. Further, the upper connecting fitting 23 is provided with a plurality of drilling tapping screws 1
3 is directly fixed to the vertical surface 24 of the beam 17 made of C-shaped steel.

Therefore, in the structure of the first example, in an earthquake or the like, the tensile force at the lower end of the striation 4 is directly transmitted to the anchor bolt 8 via the lower connecting metal fitting 20, and the lower horizontal frame member 1 and the vertical It is not transmitted to the frame material 2. Also,
The tensile force at the upper portion of the streak 4 is directly transmitted to the beam 17 via the upper connecting fitting 23, and the upper horizontal frame member 3 and the vertical frame member 2
Therefore, these frame materials do not break or deform.

FIGS. 5 to 7 show the joint structure of the lower end portion of the braces according to the second example in the first floor portion of the steel house. In this second example, the connecting structure between the lower end of the braces 4 and the anchor bolts 8 and the connecting structure between the upper ends of the braces 4 and the beams 17 are slightly different from the first example.

In the second example, the lower end portion of the bracing 4 is joined to the gusset plate 25 with the drilling tapping screw 13, and the gusset plate 25 has the vertical portion 21 of the lower connecting fitting 20 having the same L-shaped cross section as in the first example. Is joined to the side surface of the with a drilling tapping screw 13.

Further, the upper surface of the horizontal portion 22 of the lower connecting fitting 20 is reinforced to more reliably prevent deformation due to a tensile force between the lower connecting fitting 20 and the lower horizontal frame member 1 through the braces 4. A thick plate pressing metal fitting 26 is placed, and a washer 27 is further placed thereon, and the rising portion of the anchor bolt 8 is inserted through the bolt holes formed in each of these members. On the upper side, the nut 10 is fastened to the threaded portion of the anchor bolt 8. Other configurations are the same as those in the first example.

8 to 10 show, as a third example of the present invention, the lower end of the streak 4 and the beam 7 in the second floor portion of the steel house.
The joint structure with is shown. In this third example, the lower horizontal frame member 1 having the same structure as that of the second example is placed on the upper surface 28 of the beam 17 made of C-shaped steel, and the lower connecting fitting 2 is placed on the upper surface of the web 5.
The upper surface of the horizontal portion 22 of 0 is placed, the pressing metal fitting 26 and the washer 27 are sequentially placed on the horizontal portion 22, and the one side bolt 18 is passed through these bolt holes. The respective members are integrally fixed.

Then, as in the case of the second example, the lower end of the bracing 4 is joined to the gusset plate 25 by the drilling tapping screw 13, and the gusset plate 25 is fixed to the side surface of the vertical portion 21 of the lower connecting fitting 20. . As a result, the tensile force of the lower portion of the bracing 4 in the second floor portion of the steel house is transmitted to the beam 17 via the gusset plate 25, the lower connecting fitting 20, and the one side bolt 18, and the lower horizontal frame member 1 and the vertical frame member. It does not reach 2.

The one-side bolt 18 used in the third example is known, and as shown in the figure, the one-side bolt 18 is inserted into the bolt hole of each member, and the hexagonal bolt 30 is rotated by a special driver. By doing so, the expansion sleeve 31 expands, and the above-mentioned overlapped members can be fastened with one-sided work and with a large and uniform force.

11 to 18 show a bracing joint structure in a steel house embodying the present invention. In particular,
FIGS. 11 to 14 show the joint structure of the bracing lower end portion on the first floor of the steel house, and FIG. 15 to FIG.
The joint structure at the bottom end of the braces in the floor is shown.

In these specific examples, since the basic structure is common to the first to third examples, common elements are given common reference numerals, duplicate description is omitted, and only different points are described. To do.

In the example shown in FIGS. 11 to 18, the cross section L is used.
Two positioning plates 32 are provided upright on the upper surface of the pressing metal fitting 26 placed on the horizontal portion 22 of the lower connecting metal fitting 20 in a vertical shape, and the washer 27 is easily positioned by the positioning plate 32, and the pressing metal fitting is held. It is configured to be placed on the upper surface of 26. Further, the insertion hole 33 of the anchor bolt 8 provided in the holding metal fitting 26 is a long hole, and the holding metal fitting 26 is provided so that its position can be adjusted within the range of the long hole.

The tensile force of the lower end portion of the bracing 4 in FIGS. 11 to 14 is transmitted to the anchor bolt 8 via the lower connecting fitting 20.

In the example shown in FIGS. 15 to 18, the web 5 of the lower horizontal frame member 1 is fixed to the upper surface of the beam 17 made of C-shaped steel which constitutes the joist of the second floor of the steel house. The horizontal portion 22 of the lower connecting metal fitting 20 having an L-shaped cross section is placed on the upper surface of the holding metal fitting 2, and the pressing metal fitting 2 is placed on the horizontal portion 22.
6 and washer 27 are placed and formed on these 2
One side bolt (not shown) in one bolt insertion hole 34
, And they are integrally connected by the same fastening structure as shown in FIG.

The in-plane shear strength test of the wall with streaks of the present invention was carried out and the resistance to seismic force and wind force was investigated, which will be described below.

As shown in the test diagram of FIG. 19, between the lower horizontal frame member 1 fixed to the foundation 7 and the upper horizontal frame member 3 fixed to the beam 17, using the bracing structure of the present invention. In the structure in which the two vertical frame members 2 are joined to each other to form the rectangular frame body 35, and the band-shaped streaks 4 are provided between the four corners of the rectangular frame body 35, horizontal shear due to seismic force or wind force is applied. Load A
20 acts, the rectangular frame 35 and the braces 4 are displaced from the solid line in the drawing to the dotted line, and the load-deformation curve when the beam 17 horizontally moves by the deformation amount L is as shown in FIG. FIG. 20 also shows a load-deformation curve at the same time when the rectangular frame body is displaced in the conventional bracing joint structure as described above.

The horizontal shear force ratio in the conventional structure and the structure of the present invention in this case is as shown in FIG.
From this figure, it was found that the horizontal shear strength of the wall of the present invention is about twice that of the conventional structure. Further, the ratio of the deformation amount at the maximum proof stress between the conventional structure and the present invention structure is as shown in FIG. 22, and from this figure, the deformation amount of the wall of the present invention structure at the maximum proof stress is about 6 times that of the conventional structure. I found out.

From the above, it was confirmed that the wall constituted by the rectangular frame body 35 using the braces of the structure of the present invention has a high tenacity structure with high resistance against seismic force and wind force.

[0036]

As described above, according to the present invention, the tensile force acting in a straight line is directly transmitted to the anchor bolt or the floor beam without using the vertical frame members or the upper and lower horizontal frame members. It is possible to exert the proof strength and the deformation performance without straining the vertical frame member and the horizontal frame member. Thus, according to the present invention, it is possible to improve the safety of the building and prevent the interior and exterior materials from being destroyed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a joint structure of a bracing lower end portion according to a first example of the present invention.

FIG. 2 is a central vertical sectional view of FIG.

FIG. 3 is a perspective view showing a joint structure of a bracing upper end portion corresponding to FIG. 1;

FIG. 4 is a vertical sectional view of FIG.

FIG. 5 is a perspective view showing a joint structure of a bracing lower end portion according to a second example of the present invention.

6 is a vertical cross-sectional view of the central portion of FIG.

FIG. 7 is an exploded perspective view of the fixing member of FIG.

FIG. 8 is a perspective view showing a joint structure of the lower end portion of the brace at the second floor portion of the steel house as a third example of the present invention.

9 is a vertical cross-sectional view of the central portion of FIG.

FIG. 10 is an exploded perspective view of the fixing member of FIG.

FIG. 11 is a perspective view of a part of the bracing joint portion of the first floor portion of the steel house shown as the first example of the present invention.

FIG. 12 is a side view showing a bracing joint structure assembled using the joining member shown in FIG. 11.

13 is a cross-sectional view of the lower portion of FIG.

14 is a vertical sectional side view of the central portion of FIG.

FIG. 15 is a perspective view of a part of the bracing joint member on the second floor of the steel house shown as the second specific example of the present invention.

16 is an explanatory side view of a bracing joint structure assembled using the joining member of FIG.

17 is a cross-sectional plan view of the lower portion of FIG.

18 is a vertical cross-sectional view of the central portion of FIG.

FIG. 19 is an illustration for testing a bracing wall according to the present invention.

FIG. 20 is a load-deformation curve diagram of the wall with braces of the conventional structure and the structure of the present invention.

FIG. 21 is a graph showing the horizontal shear strength ratios of the wall with streaks of the conventional structure and the structure of the present invention.

FIG. 22 is a graph showing the ratio of the amount of deformation of the conventional structure and the structure of the present invention at the maximum yield strength of the wall with braces.

FIG. 23 is a perspective view of a conventional joint structure between a lower portion of a bracing and a rectangular frame body.

FIG. 24 is a perspective view of a conventional joint structure between a stiff upper portion and a rectangular frame body.

[Explanation of symbols]

 1 Lower horizontal frame member 2 Vertical frame member 3 Upper horizontal frame member 4 Striation 5 Web 6 Flange 7 Foundation 8 Anchor bolt 10 Nut 11 Hole down hardware 12 Contact part 13 Drilling tapping screw 14 Contact part 15 Gusset plate 16 Gusset plate 17 Beam 18 One-sided bolt 20 Lower connection fitting 21 Vertical part 22 Horizontal part 23 Upper connection fitting 24 Vertical surface 25 Gusset plate 26 Holding fitting 27 Washer 28 Upper surface 30 Hexagon bolt 31 Expansion sleeve 32 Positioning plate 33 Insertion hole 34 Bolt insertion hole 35 Rectangular Frame

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location E04B 1/38 E04B 1/60 511A 2/56 611B 605F 632D 632J 632B

Claims (2)

[Claims] 1. In a structure in which a horizontal frame member and a vertical frame member in upper and lower portions made of thin steel plates are joined to each other to form a rectangular frame body, and the rectangular frame body is provided with braces, a lower portion is provided at a lower end portion of the braces. A bracing joint structure in a steel house, characterized in that a connecting metal fitting is fixed and the lower connecting metal fitting is joined to an anchor bolt that is planted in the foundation integrally with the lower horizontal frame member. 2. In a structure in which a horizontal frame member and a vertical frame member in upper and lower parts made of thin steel plates are joined to each other to form a rectangular frame body, and the rectangular frame body is provided with braces, an upper connection is made to an upper end portion of the braces. A bracing structure for a steel house, in which a metal fitting is fixed and the upper connecting metal fitting is fixed to a beam together with the upper horizontal frame member.