JP2003328450A - Brazing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a brazing material improving a total buckling resistance capacity by increasing the strength of a reinforcing pipe without widening the width of the brazing material as much as possible (without changing the width), which can be used for a frame structure having a high story height. <P>SOLUTION: The brazing material is provided with an axial tension member 1, a square inside reinforcing pipe 3 in which an axial tension member 1 is diagonally inserted, and an outside reinforcing pipe 5 in which the inside reinforcing pipe 3 is inserted. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a brace material for steel structures such as buildings.

[0002]

2. Description of the Related Art Brace materials have been conventionally used in many steel structures such as buildings. As a technique for preventing buckling, for example, a steel pipe disclosed in Japanese Unexamined Patent Publication No. 7-324377 is used for stiffening. There is an invention of unbonded steel braces.

FIG. 13 is a front view of the unbonded steel frame brace shown in the publication, FIG. 14 is a sectional view of FIG. 13, and FIG. 15 is an example in which the brace shown in FIG. Shows. This unbonded steel brace uses an H-shaped steel 51 as an axial force material, and a circular steel pipe 52 as a buckling stiffening material is loosely covered on its outer periphery in a state of being substantially circumscribed, and the circular steel pipe 52 is substantially lengthwise. The central portion is fixed to the H-shaped steel pipe 51 by a shift-preventing bolt 53 which passes through the web of the H-shaped steel pipe 51 at a right angle.

The unbonded steel frame brace stiffened by the steel pipe as described above has a steel column 54 and a steel beam 5 as shown in FIG.
Arrangement in the direction (strong axis) where the flange of the H-section steel 51 bears bending in the plane of the frame formed by 5 (beam steel web and H
As the direction parallel to the web of shaped steel), both ends of the H-shaped steel 51 are joined by connecting the joining member 56 at the center of the beam and the joining member 57 at the corners of the frame with the web by bolt joining and the flange by welding joining. Has been done.

16 and 17 show examples of other braces disclosed in the publication. FIG. 16 shows that a cross-shaped member 61 is used as an axial force member and a circular steel pipe 52 is used as a stiffening steel pipe.
17 is an example in which a cross-shaped member 61 is used as an axial force member and a square steel pipe 62 is used as a stiffening steel pipe.

[0006]

However, in the conventional example, since the stiffening steel pipe in which the axial force member is almost circumscribed is used, the diameter of the stiffening steel pipe becomes small and the second moment of area of the stiffening steel pipe decreases. The overall buckling resistance of the brace material has deteriorated. For this reason, the limit length of the brace material becomes short, and there is a problem that it cannot be used for a frame with a high floor height and a frame with a long beam span.

The present invention has been made in order to solve the above problems, and increases the strength of the stiffening tube without widening the width of the brace material (without changing the width) as much as possible to improve the overall buckling resistance. The purpose is to obtain a brace material that can be used for frames with high floors.

[0008]

A brace material according to the present invention comprises an axial force member made of flat steel, a rectangular inner stiffening tube into which the axial force member is inserted in a diagonal arrangement, and an inner stiffening member. An outer stiffening tube into which the tube is inserted.

Further, the inner stiffening tube is formed in a rectangular shape in cross section, the outer stiffening tube is formed in a similar shape to the inner stiffening tube, and the inner stiffening tube and the outer stiffening tube are further formed. Are arranged so as to be shifted by 45 ° in the rotation direction.

Further, an axial force member made of flat steel, a rectangular stiffening tube into which the axial force member is inserted in a diagonal arrangement, and a corner portion other than the corner portion in which the axial force member is arranged are straddled. And a channel material joined to the side surface of the stiffening tube.

Further, the present invention comprises an axial member made of flat steel, a rectangular stiffening tube into which the axial member is inserted in a diagonal arrangement, and an angle member joined to a side surface of the stiffening tube. Is.

Further, the side of the angle member on the side orthogonal to the flat steel is set to be long.

Further, instead of the flat steel, an axial force member having a cross-shaped cross section is used.

Further, it is provided with an axial force member having a cruciform cross section, a circular inner stiffening pipe into which the axial force member is inserted, and a rectangular outer stiffening pipe into which the inner stiffening pipe is inserted. Is.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a cross-sectional view perpendicular to the axial direction of a brace material according to a first embodiment of the present invention. In the figure, 1 is an axial force member made of flat steel, 3 is an inner stiffening tube having the axial force member 1 inserted therein, and 5 is an outer stiffening tube having an inner stiffening tube 3 inserted therein. The axial member 1 is a flat plate having a rectangular cross section. The inner stiffening tube 3 has a substantially square cross section, and the axial force members 1 are diagonally arranged inside the inner stiffening tube 3. A small gap is provided between the axial force member 1 and the inner stiffening pipe 3, so that the side portion of the axial force member 1 is not constrained by the inner stiffening pipe 3.

The outer stiffening tube 5 has a substantially square cross section similar to the inner stiffening tube 3, and is arranged in a state of being rotated by 45 degrees with respect to the inner stiffening tube 3. Therefore, the vertices of the four corners of the inner stiffening tube 3 are located in the middle of each side of the outer stiffening tube 5.

FIG. 2 is a sectional view taken along line AA of FIG. Figure 2
As shown in FIG. 3, the axial force member 1 is formed to be longer than the inner and outer stiffening pipes 3 and 5, and bolt holes (not shown) for attaching to columns or beams (not shown) are provided at both ends. ing. At both ends of the brace material, the axial force material 1
Spot welding 7 is performed to prevent the inner stiffening tube 3 and the inner stiffening tube 3 and the outer stiffening tube 5 from being displaced from each other. However, the spot welding 7 may be replaced by other means, for example, a clip.

FIG. 3 is a perspective view showing a state in which the brace material of the present embodiment is attached to a frame portion composed of columns and beams. Note that the stiffening tube is omitted from the brace material on the right side of the drawing for ease of explanation. In the figure, 9,
11 is a pillar, and 13 and 15 are beams installed between the pillars 9 and 11. Numerals 17 and 19 are gusset plates installed in the corners of the frame, and numeral 21 is a gusset plate installed in the lower central portion of the upper beam. Reference numeral 25 is a cross-shaped connecting member installed at the end of the axial force member 1. The axial force member 1 is installed so that the width direction thereof is parallel to the surface of the frame (see the brace on the right side of the figure). By installing in such an orientation, the orientation of the axial force member, the gut plate and the web of the beam will match,
The force is transmitted smoothly. When the axial force member 1 is installed in the above-described direction, the side surface of the outer stiffening tube 5 coincides with the wall surface direction of the frame, so that the wall member fits well.

The brace material constructed as described above yields due to axial force during an earthquake. At this time, the axial force member 1 tries to buckle by bending in the out-of-plane direction of the frame, but the buckling is blocked by the inner stiffening tube 3 and the outer stiffening tube 5 to yield in the axial direction, so that energy is saved. Can be fully absorbed. Moreover, the outer diameter of the outer stiffening tube 5 is equal to that of the inner stiffening tube 3.
2 ^1/2 times (2 times the route) and the bending rigidity is increased to about 4 times, so the overall buckling resistance of the brace material is greatly improved. On the other hand, since the thickness in the wall direction is increased only by the thickness of the outer stiffening tube 5, the wall material can be accommodated very well.

In the above description, in order to prevent the positional deviation between the outer stiffening tube 5 and the inner stiffening tube 3, an example in which spot welding is performed at the ends is shown. However, as shown in FIG. A plate 3 for preventing rotation between the outer stiffening tube 5 and the inner stiffening tube 3
You may make it set 0.

In the first embodiment, various modes can be considered for the axial force member, the inner stiffening tube 3 and the outer stiffening tube 5. 5 to 8 are explanatory views of these other modes.
Hereinafter, another aspect will be described with reference to FIGS. Figure 5
What is shown in FIG. 3 is the outer stiffening tube 5 having a square cross section in the one shown in FIG.
Moreover, what was shown in FIG. 6 is what made the axial force material 1 of the flat steel in FIG. 1 into the cross shape.

Further, in FIG. 7, the outer stiffening tube 5 having a square cross section in FIG. 6 has a circular cross section. 8 shows the inner stiffening tube 3 having a square cross section in FIG. 6 with a circular cross section.

Embodiment 2. FIG. 9 is an explanatory diagram of the second embodiment of the present invention, and is a cross-sectional view perpendicular to the axis of the brace material. In the present embodiment, instead of the outer stiffening tube 5 in the first embodiment, a channel material is joined to the outer surface of the stiffening tube. In FIG. 9, 31 and 33 are stiffening tubes 3 (corresponding to the inner stiffening tubes in the first embodiment).
Is a channel material joined to the outer peripheral surface of the by welding.
The channel members 31 and 33 are installed so as to straddle the corners of the stiffening tube 3. The channel material is installed so as to face both sides of the axial force material. When the axial force member 1 bends, the stiffening tube 3 that tends to bend due to the stress of the axial force member 1
This is because it is necessary to provide such a position in order to stiffen.

According to the second embodiment, the first embodiment
In the case of 1, the accuracy control of the inner stiffening tube 3 and the outer stiffening tube 5 was required, but it is almost unnecessary, so that the manufacturing becomes simple.

FIG. 10 is an explanatory diagram of another aspect of the present embodiment. In this example, the channel materials 31 and 3 shown in FIG.
In place of 3, the angle members 35 to 38 are joined to the outer peripheral surface of the stiffening tube 3. In this case, further accuracy control is unnecessary.

In FIG. 10, the angle member 35 is used.
In the example of No. 38 to 38, both sides have the same length. However, as shown in FIG. 11, the angle member is increased so that the bending rigidity of the stiffening tube 3 in the bending direction of the axial member 1 is increased. The length of the side of may be changed. By doing so, efficient stiffening with material savings is possible.

FIG. 12 is an explanatory diagram of another embodiment.
In this example, a cross-shaped axial force member 1 is used instead of the flat steel axial force member 1 shown in FIG.

[0028]

According to the present invention, the following effects can be obtained.
Since the axial force member made of flat steel, the square inner stiffening tube into which the axial force member is inserted in a diagonal arrangement, and the outer stiffening tube into which the inner stiffening pipe is inserted are provided, the brace member is provided. It is possible to improve the overall buckling resistance by increasing the strength of the stiffening tube without expanding the width of the stiffener as much as possible (without changing the width), and to obtain a brace material that can be used for a frame with a high floor height.

Further, the inner stiffening tube is formed in a rectangular shape in cross section, the outer stiffening tube is formed in a similar shape to the inner stiffening tube, and the inner stiffening tube and the outer stiffening tube are arranged in the rotational direction 45. Since they are arranged so as to be offset from each other, the above-described effect that the overall buckling resistance can be improved without increasing the width of the brace member can be obtained more reliably.

Further, an axial force member made of flat steel, a rectangular stiffening tube into which the axial force member is inserted in a diagonal arrangement, and a corner portion other than the corner portion where the axial force member is arranged are straddled. By including the channel material joined to the side surface of the stiffening tube, in addition to the same effect as described above, there is an effect that the manufacturing is easy because accuracy is not required.

Further, there is provided an axial member made of flat steel, a rectangular stiffening tube into which the axial member is inserted in a diagonal arrangement, and an angle member joined to a side surface of the stiffening tube. As a result, it is possible to obtain the effect that further accuracy is not required and the manufacturing becomes easy.

Further, by setting the side of the angle member on the side orthogonal to the flat steel to be long, necessary stiffening can be realized with a material having a small amount.

Further, instead of the flat steel, an axial force material having a cross-shaped cross section can be used to obtain the same effect as above.

Further, there is provided an axial force member having a cruciform cross section, a circular inner stiffening pipe into which the axial force member is inserted, and an angular outer stiffening pipe into which the inner stiffening pipe is inserted. The strength of the stiffening tube can be increased without increasing the width of the brace member as much as possible (without changing the width) to improve the overall buckling resistance, and a brace material that can also be used for frames with high floors can be obtained. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view perpendicular to an axial direction of a brace material according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a state in which the brace material according to the first embodiment is attached to a frame portion composed of columns and beams.

FIG. 4 is an explanatory diagram of another aspect of the first embodiment.

FIG. 5 is an explanatory diagram of another aspect of the first embodiment.

FIG. 6 is an explanatory diagram of another aspect of the first embodiment.

FIG. 7 is an explanatory diagram of another aspect of the first embodiment.

FIG. 8 is an explanatory diagram of another aspect of the first embodiment.

FIG. 9 is a cross-sectional view perpendicular to the axial direction of the brace material according to the second embodiment of the present invention.

FIG. 10 is an explanatory diagram of another aspect of the second embodiment.

FIG. 11 is an explanatory diagram of another aspect of the second embodiment.

FIG. 12 is an explanatory diagram of another aspect of the second embodiment.

FIG. 13 is a front view of a conventional brace material.

FIG. 14 is a sectional view perpendicular to the axial direction of FIG.

FIG. 15 is an explanatory view of a conventional brace member attached state.

FIG. 16 is an explanatory diagram of another example of a conventional brace material.

FIG. 17 is an explanatory view of another example of the conventional brace material.

[Explanation of symbols]

1 axial force material 3 Inner stiffening tube 5 Outside stiffening tube

Continued front page    (72) Inventor Hiromi Shimokawa             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. F-term (reference) 2E125 AA33 AB02 AB05 AB08 AB16                       AB17 AC15 AC16 AG20 AG57                       CA90

Claims (7)

[Claims] 1. An axial stiffening member made of flat steel, a rectangular inner stiffening tube into which the axial stiffening member is inserted in a diagonal arrangement, and an outer stiffening tube into which the inner stiffening tube is inserted. Brace material characterized by 2. The inner stiffening tube is formed in a rectangular shape in cross section, the outer stiffening tube is formed in a shape similar to the inner stiffening tube, and the inner stiffening tube and the outer stiffening tube are formed. The brace material according to claim 1, wherein the brace members are arranged so as to be offset by 45 ° in the rotational direction. 3. An axial force member made of flat steel, a rectangular stiffening tube into which the axial force member is inserted in a diagonal arrangement, and a corner portion other than a corner portion in which the axial force member is arranged are straddled. And a channel material joined to the side surface of the stiffening tube. 4. An axial force member made of flat steel, a rectangular stiffening pipe into which the axial force member is inserted in a diagonal arrangement, and an angle member joined to a side surface of the stiffening pipe. Brace material characterized by. 5. The brace material according to claim 4, wherein a side of the angle material on a side orthogonal to the flat steel is set to be long. 6. The brace material according to claim 1, wherein an axial force member having a cross-shaped cross section is used instead of the flat steel. 7. An axial force member having a cruciform cross section, a circular inner stiffening tube into which the axial force member is inserted, and an angular outer stiffening tube into which the inner stiffening pipe is inserted. Brace material characterized by.