JP2001065064A - Joint structure between steel pipe column and brace member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide joint structure easily executable in a short time at a low cost and having sufficient strength and rigidity in the case of jointing the end part of a brace member to a steel pipe column of closed cross section. SOLUTION: A joint plate 13 projected vertically to a frame surface of a rectangular steel pipe column 2 is welded to a one-side half peripheral part of the steel pipe column 2 including two side faces 11, 11 parallel with the frame surface and a one-side side face 12 vertical to the frame surface, at the same angle as the fitting angle of a brace member 1. An end part 1a of the brace member 1 is on the same plane as an end part 13a of the joint plate 13 and mechanically jointed by a bolt 16 through a splice plate 15. Stress of the brace member 1 is transmitted to the side faces 11, 12 of the steel pipe column 2 from the in-plane of the joint plate 13 through the splice plate 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a steel pipe column and a brace member in a steel structure.

[0002]

2. Description of the Related Art In a steel structure, in order to resist a horizontal force due to an earthquake, a brace structure in which a brace material (brace, brace, etc.) is arranged on a frame including columns and beams is used. Commonly used.

FIG. 5 shows an example of a structural frame in which a brace member 1 is disposed on a frame including a steel pipe column 2 and an H-shaped steel beam 3. In this structure, by joining both ends of the brace member 1 at an intermediate portion between the column 2 and the beam 3, respectively, the space below the beam can be effectively utilized.

When this structure receives a horizontal force due to an external force such as an earthquake, an axial stress is generated in the brace member 1 due to the shear deformation of the frame, and the resistance causes the displacement and the column displacement of the brace member 1 as compared with a frame without the brace member. The reduction of the stress of the beam frame can be realized.

In addition, such a structure is required when reinforcing a so-called nonconforming building which does not conform to the conditions of the seismic design standard defined based on new knowledge with a brace member having a function of a vibration control reinforcing member. It is particularly effective for such applications.

Here, the seismic control reinforcing member has a characteristic of absorbing energy by generating a finite deformation by receiving a stress in the axial direction of the member. As a specific example, an elastic-plastic characteristic of steel or the like is used. Elasto-plastic dampers, viscous dampers using a viscous body, friction dampers using a frictional force between materials, and the like.

[0007]

In order to realize the above-mentioned steel structure, a joint structure capable of sufficiently transmitting the stress outside the cross section transmitted from the brace member to the existing column member and beam member is indispensable. is there.

When the column and beam members of the frame to which the brace members are to be joined are made of H-shaped steel, FIG.
As shown in FIG. 7, a structure in which a rib plate 22 for reinforcement is inserted between two flanges 21 of the H-shaped steel column 4 from outside and joined by welding is considered. In this case, since the stress transmitted from the brace member 1 is transmitted to the existing column 4 via the rib plate 22, a joint structure having sufficient rigidity and proof stress for transmitting the stress can be realized relatively easily. .

On the other hand, pillars of buildings are often made of circular or square steel pipes. As a method of transmitting the stress from the outside to the member having such a closed cross section, application of a joining structure conventionally used for joining a steel pipe column to an H-shaped steel beam or the like can be considered.

[0010] One of them is, as shown in FIG.
Is a through-diaphragm type in which a plate material 23 for joining the end portion 1a of the brace member is inserted in the middle of the plate member. However, in the case of the through-diaphragm type, it is necessary to cut the steel pipe column 2 in order to penetrate the plate member 23, so that it takes time to process the steel frame and the cost is high.

In particular, when attaching a brace member to an existing building, it is extremely difficult to realize such a joint while using the building. The other is Figure 8
As shown in FIG. 2, an outer diaphragm type in which a plate material 24 for joining the ends 1a of the brace members is joined to the entire outer periphery of the steel pipe column 2 by welding.

The outer diaphragm type can be constructed without cutting the steel pipe column 2 as in the through-diaphragm type, and sufficient stress transmission can be expected. However, in order to weld the plate 24 to the entire outer periphery of the steel pipe column 2, , Plate material amount and welding length increased,
After all, time is required for steel frame processing, and the cost is high.

Further, when the brace members are attached to the frame surfaces on both sides of the steel pipe column 2, the plate members 24 of the respective obliquely joined surfaces interfere with each other, and the brace members are attached at the same height. Can not do.

[0014] In addition, Japanese Patent Application Laid-Open No. 11-44002 discloses that a plate material for joining is welded to a side surface parallel to a frame surface of a rectangular steel pipe column so that the plate surface abuts, and the plate material is welded to these plate materials. A structure for joining the ends of the brace members is disclosed.

However, the structure is such that the plate material is joined only by fillet welding at the outer peripheral portion of the plate surface with which the plate material is in contact, and the stress from the brace member is transmitted from the welded portion on the side surface of the square steel pipe column. For this reason, it is difficult to obtain sufficient strength for a large amount of sheet material and a long welding length. Further, it cannot be applied to a steel pipe column having a circular cross section.

Further, as in the other joining types described above, when the brace members are mounted on the frame surfaces on both sides of the steel pipe column, the plate members interfere with each other, so that the brace members cannot be mounted at the same height.

The present invention has been made to solve the above-mentioned problems in the prior art, and when joining the ends of a brace member to a steel pipe column having a closed cross section, the construction can be easily performed in a short time and at low cost. It is an object of the present invention to provide a bonding structure that can be formed and has sufficient strength and rigidity.

[0018]

The invention according to claim 1 of the present application is a joint between a steel pipe column constituting a steel structure and a brace member disposed in a frame surrounded by the steel pipe column and the beam. A joining plate orthogonal to the frame surface is welded to approximately half of the outer surface of the steel pipe column to which the brace member is joined, and an end of the brace member is joined to the joining plate. It is characterized by becoming. In this case, welding of the joining plate to the steel pipe column may be either butt welding or fillet welding.

In the above structure, the joint portion with the brace member can be formed without cutting the steel tube column, which is the column member, in the middle, and the transmission of the stress from the brace member to the steel tube column becomes smooth.

Further, it is not necessary to weld the joint plate projecting to the outer surface of the steel pipe column to the steel pipe column over the entire circumference of the column section, so that the time required for the steel frame can be reduced, and the cost can be reduced. .

According to a second aspect of the present invention, in the joint structure of the steel pipe column and the brace member according to the first aspect, the joint plates are provided at substantially the same height of the steel pipe column with respect to the frame surfaces on both sides of the steel pipe column. This is the case where welding is performed separately and the brace members arranged in the respective frame surfaces are joined.

In the case of the conventional outer diaphragm type at the beam-to-column joint or in the structure described in Japanese Patent Application Laid-Open No. 11-44002, the plate members for joining interfere with each other. Although it is not possible to join at the same height, in the case of the present invention, since the joining plate is a structure that is welded only to substantially half the circumference on the side where each brace member of the steel pipe column is joined, there is no interference between the joining plates. And joining at the same height is possible.

In the case where the welded portion is less than half a circumference, there is no particular problem in making the brace members have the same height, and no special processing or the like is required. In some cases, it is necessary to perform some processing such as bending the interference position between the joining plates, or to deviate the height of the brace members slightly.

According to a third aspect of the present invention, in the joint structure of the steel tube column and the brace member according to the first or second embodiment, the steel tube column is a column of an existing steel structure, and the joint plate is welded later to newly install the joint plate. This is the case where the brace members are joined.

In the case of the conventional through-diaphragm type joint at the beam-column joint, it is almost impossible to attach the diaphragm and join the brace members later in the structure in use, but in the case of the present invention. Is suitable for construction while using existing structures, because the joint plate is welded to the outer periphery of the steel pipe column.

According to a fourth aspect of the present invention, in the joint structure of the steel pipe column and the brace member according to the first, second or third aspect, the brace member is a brace member having a function of a vibration damping reinforcing member.

Examples of the vibration damping reinforcing members include the above-described elasto-plastic dampers, viscous dampers, friction dampers, and the like. Not only when these members are incorporated in the middle of the brace member members, but also when the entire brace members are the vibration damping reinforcing members. Is also included.

According to a fifth aspect of the present invention, in the joint structure of the steel pipe column and the brace member according to the first, second, third or fourth aspect, the joining plate and the brace member are attached to each other by a splicing plate.
This is the case where the bolts are connected through the holes.

When the bolts are joined via the attachment plate, not only the joining work at the time of attachment is easy, but also the replacement of a member damaged by an earthquake or the like is easy.

[0030]

FIG. 1 shows a joint structure between a steel pipe column and a brace member according to a first embodiment of the present invention.

In this embodiment, two side surfaces 11 parallel to the frame surface of the square steel tubular column 2 and one side surface 12 perpendicular to the frame surface are provided.
The joining plate 13 that projects perpendicular to the frame surface at the same angle as the mounting angle of the brace member 1 is joined to the one-sided half-circumferential portion including the welding portion 5.

The end 1a of the brace member 1 is on the same plane as the end 13a of the joining plate 13, and a plurality of bolt holes are formed in the end 13a of the joining plate 13 and the end 1a of the brace member 1. And is mechanically joined by bolts 16 via an attachment plate 15 also having a plurality of bolt holes.

With such a structure, the stress of the brace member 1 is transmitted from the plane of the joining plate 13 to the side surfaces 11 and 12 of the steel pipe column 2 via the attachment plate 15. FIG. 2 shows an experimental result of a load-deformation relationship for verifying a stress transmission when the joining plate is welded to only one half of the cross section of the steel pipe column 2 as described above. In the drawing, the solid line indicates the case where the joining plate is welded on only one half of the joining plate according to the present invention, and the alternate long and short dash line indicates the case where the entire periphery of the section is welded in the form of an outer diaphragm.

As is clear from the figure, the rigidity between the two,
There was no difference in proof stress, and it was confirmed that stress could be sufficiently transmitted by only one half circumference. Therefore, since the joining can be performed with a small amount of welding, the joining portion can be constructed more economically and in a short time.

The end 1a of the brace member 1 and the end 13a of the joining plate 13 can be joined by welding. However, as in the present embodiment, the joining is performed by bolt joining via the attachment plate 15. For example, joining work when attaching the brace member 2,
In addition, replacement of the brace member 2 is facilitated.

The joining plate 13 and the side surface 1 of the square steel tubular column 2
The joining by the welding portions 5 of 1 and 12 may be any of butt welding and fillet welding as long as the joint has sufficient strength so as not to cause breakage at the welded portion.

FIG. 3 shows a joint structure between a steel pipe column and a brace member according to a second embodiment of the present invention. In the present embodiment, the two side surfaces 11 parallel to the frame surface of the rectangular steel tube column 2 and the one-sided half circumferential portion including the one side surface 12 perpendicular to the frame surface are formed on a plane perpendicular to the axial direction of the steel tube column 2. A certain joining plate 17 is joined by the welding portion 5.

A plate 17a having the same angle as the mounting angle of the brace member 1 and projecting on a plane perpendicular to the frame surface is joined to the joining plate 17 by butt welding. Further, a plate member 18 located on the same plane as the frame surface is provided on the side surface 12 of the square steel pipe column 2 so as to be orthogonal to the plate member 17a.

The end 1a of the brace member 1 is connected to a plate 17a joined to the joint plate 17 and a plate 18 perpendicular to the plate 17a.
The plate members 17a and 18 and the end 1a of the brace member 1 are formed with a plurality of bolt holes, respectively, and an attachment plate having a plurality of bolt holes as well. It is mechanically joined by a bolt 16 via 15.

With such a configuration, the stress of the brace member 1 is transmitted from the in-plane of the plate member 17a to the two side surfaces 11 parallel to the frame surface of the steel pipe column 1 through the joining plate 17 via the attachment plate 15. And the force transmitted to the side surface 12 orthogonal to the frame surface through the plate member 18,
It is transmitted to the steel pipe column 1.

By dividing the stress in two directions, the stress generated in the thickness direction of the steel pipe column 1 can be reduced, and the local deformation generated at the joint can be reduced.
FIG. 4 shows a joint structure between a steel pipe column and a brace member according to a third embodiment of the present invention.

In the present embodiment, the brace member 1 is joined to the steel pipe column 2 from both frame surfaces sandwiching the square steel pipe column 2, and has a shape symmetrical with respect to the center line of the steel pipe column 2. . The other components are the same as those of the first embodiment.

With such a structure, even when the brace member 1 is mounted from both sides of the steel pipe column 2, since the two mounting plates 13 can be joined at the same mounting height without intersecting, the construction is easy. Become.

In each of the above embodiments, the case where the column is a square steel pipe is shown.
For example, the present invention can be similarly applied to a circular steel pipe column.

[0045]

According to the present invention, the joining plate orthogonal to the frame surface is welded to almost only a half of the outer peripheral surface of the steel pipe column, and the brace member is joined to this portion, so that the column member is not cut. In addition, it is possible to obtain a joint structure in which stress is smoothly transmitted between the brace member and the steel pipe column, and it is possible to reduce the time required for construction and the cost.

According to the second aspect of the present invention, when the brace members are joined from both sides of the steel pipe column, the joining plates are welded from the frame surfaces on both sides of the steel pipe column,
The brace members on both sides can be easily joined at the same mounting height without intersecting these joining plates.

Further, since it is not necessary to cut the column members, the construction using the existing structure as defined in claim 3 is performed. In particular, the existing structure is reinforced by the vibration control reinforcing member as described in claim 4. It is suitable for such cases.

According to the fifth aspect of the present invention, since the joining plate joined to the pillar and the brace member are joined by bolts via the attachment plate, joining work at the time of attachment and replacement of the damaged brace member are easy. It is.

[Brief description of the drawings]

1A and 1B show a joint structure between a steel pipe column and a brace member according to a first embodiment of the present invention, wherein FIG. 1A is a side view and FIG.

FIG. 2 is a graph showing an experimental result of a load-deformation relationship between a joint according to the present invention and a joint of an outer diaphragm type.

3A and 3B show a joint structure between a steel pipe column and a brace member according to a second embodiment of the present invention, wherein FIG. 3A is a side view, and FIG. 3B is a BB cross-sectional view thereof.

FIGS. 4A and 4B show a joint structure between a steel pipe column and a brace member according to a third embodiment of the present invention, wherein FIG. 4A is a side view and FIG.

FIG. 5 is a side view showing an example of a structural frame in which a brace member is joined to a frame composed of a steel pipe column and an H-shaped steel beam.

6A and 6B show an example of a joining structure when an H-shaped steel column and a brace member are joined according to a conventional technique, wherein FIG. 6A is a side view, and FIG.

FIG. 7 shows an example of a joint structure in a case where a steel pipe column and a brace member are joined through a diaphragm type.
(a) is a side view, (b) is the EE sectional view.

FIG. 8 shows an example of a joint structure when a steel pipe column and a brace member are joined in the form of an outer diaphragm.
Is a side view, and (b) is an FF sectional view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Brace member, 1a ... Brace member end part, 2 ... Steel pipe column, 3 ... H-shaped steel beam, 4 ... H-shaped steel column, 5 ... welded part, 11,
12 ... side surface of square steel tubular column, 13, 14, 17 ... joining plate,
Reference numeral 15: attachment plate, 16: bolt, 18: plate, 21: H-shaped steel column flange, 22: rib plate, 23, 24: plate (diaphragm)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Keiichi Takada, Inventor, 4-5-133 Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metal Industries, Ltd. (72) Inventor Yasuo Ichinohe 4-5-Kitahama, Chuo-ku, Osaka, Osaka No. 33 Sumitomo Metal Industries Co., Ltd. (72) Inventor Koji Fukuda 4-33 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries Co., Ltd. (72) Inventor Tsuneo Hasuda 2-chome Hikaricho, Kokubunji, Tokyo No. 8 38 Inside the Railway Technical Research Institute (72) Inventor Yasushi Yasushi 2-chome Mitsumachi, Kokubunji-shi, Tokyo F-term (reference) 2E125 AA04 AA33 AB16 AC16 AG12 AG57 BB02 BB04 BB22 BC05 BD01 BE08 BF04 BF08 CA05 CA14

Claims (5)

[Claims] 1. A joining structure of a steel pipe column constituting a steel structure and a brace member disposed in a frame surface surrounded by the steel pipe column and a beam, wherein the brace on an outer surface of the steel pipe column is provided. A joining plate orthogonal to the frame surface is welded to a substantially half circumference on a side where members are joined, and an end of the brace member is joined to the joining plate. Construction. 2. The joint plates are separately welded to substantially the same height of the steel column as to the frame surfaces on both sides sandwiching the steel column, and the brace members arranged in the respective frame surfaces are joined. The joint structure between a steel pipe column and a brace member according to claim 1 which is formed. 3. The steel pipe column and the brace member according to claim 1, wherein the steel column is a column of an existing steel structure, and the joining plate is later welded to join a new brace member. Joint structure. 4. The joint structure between a steel pipe column and a brace member according to claim 1, wherein the brace member is a brace member having a function of a vibration control reinforcing member. 5. The joint structure between a steel pipe column and a brace member according to claim 1, wherein the joint plate and the brace member are bolted via an attachment plate.