JP2000110236A - Hardware for beam flange joint, column-beam joint structure using the same, and beam-column joint construction method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To sufficiently satisfy the condition of rigid connection of stress transmission between a column and a beam, and it is not necessary to cut a square steel tube column, and it is easy to cut and weld members. , Structural safety,
To provide a beam-to-column joint structure with excellent economic efficiency. SOLUTION: A beam flange joining hardware 12 is arranged on four sides of a rectangular steel pipe column 1, and adjacent beam flange joining hardware 12 are arranged.
Are connected to each other with bolts 11 and temporarily attached to the square steel tubular column 1. In this state, the H-shaped steel bracket beam 2 is tack-welded to the beam flange joining hardware 12,
Thereafter, the bolts 11 are removed, and the integral beam flange joining hardware 12 and the H-shaped steel bracket beam 12 are removed from the square steel tube column 1. Next, the beam flange joining hardware 12 and the flange portion 2a of the H-shaped steel bracket beam 2 are fully welded,
This is temporarily attached again to a predetermined position of the square steel tubular column 1.
Next, the beam flange joining hardware 12 and the tube wall of the square steel tubular column 1 are welded and joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel structure using a square steel pipe for a column and an H-beam for a beam, and a column-beam used for rigidly connecting a square steel pipe column and an H-beam bracket beam. The present invention relates to a beam flange joining hardware for a joint structure, and a column-beam joining method for rigidly joining a square steel tubular column and an H-beam bracket beam using the beam flange joining hardware.

[0002]

2. Description of the Related Art In general, in steel buildings such as buildings and houses in Japan, a so-called ramen structure in which a column and a beam are rigidly connected to each other is generally employed in consideration of securing earthquake resistance. It is. When a square steel pipe is used as a column and an H-beam is used as a beam, various methods have been used as a joining method for making a column-beam joint part rigid.

[0003] The most frequently used joining method is a method called a through-diaphragm schematically shown in FIG. 1, and the upper and lower portions of the H-shaped steel at the portion where the H-shaped steel beam 2 of the rectangular steel tube column 1 is attached. A rectangular steel pipe column 1 is cut at two positions of a flange 2a, and a steel plate 3 called a diaphragm
Then, the two through-diaphragm plates and the cut square steel pipe are joined again by welding. According to this method, it is necessary to cut the long rectangular steel pipe once and to perform welding again by complete penetration welding, which requires a very large amount of welding work, requires skilled welding skills, and is a high cost method. In addition, if improper welding is performed, the stress to be transmitted between the column and the beam cannot be transmitted sufficiently, and it may be broken below the strength intended by the design, and the collapse of the steel frame due to the Great Hanshin-Awaji Earthquake Was seen as a factor.

[0004] As one of the joining methods for solving the problem of the through-diaphragm joining, there is a column-beam joining method called an outer diaphragm joining which is schematically shown in FIG. In this joining method, the rectangular steel pipe column 1 is used without being cut at the beam position, and is used as it is, and a steel plate 4 called an outer diaphragm is arranged around the square steel pipe at the level where the H-shaped steel beam flange is located. Is welded to the square steel pipe wall, and the web plate 4a is inserted between the upper and lower outer diaphragms, and H
A method is adopted in which a cross section is formed and an H-shaped steel beam is joined thereto.

In the above outer diaphragm joining method, FIG.
As shown in the figure, the outer diaphragm is cut from a steel plate into a complicated shape according to the cross-sectional shape of the square steel pipe and the groove processing for welding is performed, a problem in cutting processing, complete penetration welding of the outer diaphragm and the square steel pipe column In order to perform downward welding in such a case, for example, even in a three-story building, it is necessary to take a very difficult method of welding in a state where a pillar having a length of 10 m or more is erected, and a square steel tube column is required. If the method of welding in the horizontal direction is used, it is necessary to perform horizontal welding that requires a high level of welding skill, and particularly, since the corners of the square steel pipe column are arc-shaped, the corners are welded downward. Is a difficult welding technology problem that the welding must be performed while rotating the columns.
It is necessary to provide a reinforcing rib on this surface to transmit the stress from the H-shaped steel beam because a surface where the shaped steel beam cannot be attached is formed. There are problems such as problems and the like, and the joining method using the outer diaphragm is difficult to use and is expensive. In this way, the joining method using the outer diaphragm
Although it is recognized that it is excellent in structural strength because it does not cut columns, there are many problems in processing, cost, etc., and it is hardly adopted.

In order to solve the problems associated with the column-beam joints such as the through diaphragm and the outer diaphragm as described above,
A number of ideas and devices have been tried for column-beam joints having a rectangular steel tube column and an H-shaped steel beam, but none of them have been widely used. For example, although a square steel pipe column is cut, a method of using a steel block for a portion to which an H-shaped steel beam is attached and fixing the beam to this, or a method of providing a bolt hole in the pipe wall without cutting the column, etc., are mentioned. Can be In the former case, although welding is reduced, welding is still required to join the square steel tubular column and the steel block, and the cost is high because the steel block itself is expensive. The latter has its advantages and disadvantages, however, although the diaphragm plate is unnecessary and the amount of welding and processing is reduced, but the stress of the beam flange deforms the rectangular steel tube column wall and does not become a sufficiently rigid column-beam joint.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an outer diaphragm joining method for forming a rigid joint column-to-column joint without cutting a column in a structure using a square steel tubular column and an H-shaped steel beam. In accordance with the concept of, the processing and welding work is easy without cutting the square steel pipe column, the stress between the column and the beam can be sufficiently transmitted and it does not hinder the installation with the outer wall,
It is an object of the present invention to provide a beam-column joint structure and a beam-column joint construction method by rigid connection that are structurally superior to conventional technologies and advantageous in cost.

[0008]

According to a first aspect of the present invention, there is provided a steel frame-structured steel column fixedly attached to four sides of a square steel column in order to rigidly join the column and the H-shaped bracket beam. A metal part for beam flange joining, which is arranged to be in surface contact with the pipe wall of a rectangular steel pipe column, and extends from both sides of the flat part to respectively join adjacent metal parts for beam flange joining. An extension plate portion provided with a bolt hole and a flange fixing plate portion perpendicular to the flat plate portion and the extension plate portion for fixing the flange of the H-beam bracket beam are integrally provided. . In addition,
The above-mentioned H-shaped steel bracket beam refers to a short H-shaped steel beam which is rigidly joined in advance to a square steel pipe column as a part of the H-shaped steel beam, and an H-shaped beam prepared separately from this H-shaped steel bracket beam Steel beams are joined by bolts.

According to a second aspect of the present invention, there is provided a beam-column joint structure in which a rectangular steel pipe column and an H-shaped steel bracket beam are rigidly connected to each other by using the beam flange connecting hardware of the first invention. , The beam flange joining hardware is arranged on each of the four sides of the upper and lower flange portions of the H-shaped steel bracket beam to be attached to the rectangular steel tubular column, and the adjacent beam flange joining hardware is bolted together and the beam flange joining hardware is used. The flat plate portion is fixed to the tube wall of the square steel pipe column, and the flange fixing plate portion of the metal fitting for beam flange connection and the flange of the H-shaped steel bracket beam are mutually fixed.

According to a third aspect of the present invention, there is provided a column-to-beam joint construction method for rigidly connecting a rectangular steel pipe column and an H-shaped steel bracket beam using the beam flange bonding hardware according to the first aspect. The beam flange joining hardware is placed substantially horizontally, and the beam flange joining hardware is arranged on each of four sides of the upper and lower flange portions of the H-shaped steel bracket beam to be attached to the square steel column, and the adjacent beam flange joining hardware is attached. A first step of temporarily attaching two sets of four sets of beam flange joining hardware to a square steel tubular column by bolt connection, and an H-shape on a flange fixing plate portion of the temporarily attached beam flange joining hardware. A second step of tack-welding the flange portion of the steel bracket beam, and removing the beam flange joining hardware temporarily attached to the square steel pipe column from the square steel pipe column, and temporarily welding the beam flange. A third step of main-welding the metal fitting for joining and the flange portion of the H-shaped steel bracket beam, and re-placing the metal fitting for beam flange joining in the H-shaped steel bracket beam with metal fitting with the metal fitting for beam flange joining again to a square steel pipe column A fourth step of disposing them at predetermined positions and temporarily attaching them to the square steel pipe columns, and attaching two sets of upper and lower beam flange joining hardware temporarily attached to the square steel pipe columns to the pipe wall of the square steel pipe columns, respectively. And a fifth step of welding.

[0011]

FIG. 4 shows an embodiment of the present invention.
This will be described with reference to FIG. In the present invention, a rectangular steel pipe column was used without cutting, and a metal flange joining hardware was arranged around the column at the positions of the upper and lower flanges of the H-shaped steel beam, and the stress from the H-shaped steel beam was attached to the beam flange. This is a joint method for transmitting stress between a column and a beam, which is a requirement for a rigid joint column-beam joint, by transmitting a beam flange joint fitting to an adjacent beam flange joint fitting and a square steel tube column wall.

One embodiment of the method for constructing a beam-to-column joint according to the present invention will be described with reference to a process explanatory view of FIG. 7 and the like. Prepare two sets at the beam joint. As shown in FIG. 4 to FIG. 6, FIG. 8, and the like, the metal fitting 12 for beam flange joining includes a flat plate portion 6 arranged in surface contact with the tube wall of the rectangular steel pipe column 1, and from both sides of the flat plate portion 6. An elongated plate portion 7 provided with a bolt hole 8 for extending and joining adjacent metal members 12 for beam flange joining, and an H-shaped steel bracket beam 2
And a flange fixing plate portion 9 perpendicular to the flat plate portion 8 and the extending plate portion 7 for fixing the flange portion 2a. Note that the above H-beam bracket beam 2
"H" refers to a short H-shaped steel beam which is rigidly connected in advance as a part of the H-shaped steel beam to the square steel tubular column 1, and an H-shaped steel beam (not shown) separately prepared for the H-shaped steel bracket beam Are bolted together with the joint plate.

Next, as shown in FIG. 7A, the square steel tube column 1 is placed substantially horizontally, and the upper and lower flange portions of the H-shaped steel bracket beam 2 attached to the square steel tube column 1 in the square steel tube column 1. The metal fittings for beam flange connection 12 are respectively arranged on the four surfaces of the beam, and the metal fittings for beam flange connection 1
The two pieces are bolted together, and two sets of four metal fittings 12 for beam flange joining are temporarily attached to the square steel tubular column 1. The details of this state are as shown in FIG. 8 (however, except for the H-shaped steel bracket beam 2 shown by a broken line). In this case, when temporarily mounting four sets of beam flange joining hardware 12 on the four surfaces of the square steel tubular column 1, a gap is previously provided between the extending plate portions 7 of the adjacent beam flange joining hardware 12. By tightening the bolt 11,
When a set of four metal flange joining hardware 12 forming an annular shape is tightened, each beam flange joining hardware 12 is tightly fixed to the tube wall of the square steel tubular column 1.

Next, as shown in FIG. 7 (b), a temporary assembly in which the flange portion 2a of the H-shaped steel bracket beam 2 is temporarily welded to the flange fixing plate portion 9 of the beam flange joining hardware 12 temporarily attached. I do.

Next, the four beam flange joining hardware 12 are connected.
Is removed from the rectangular steel tube column 1 together with the H-shaped steel bracket beam 2, and the H-shaped steel bracket beam 2 is placed horizontally and temporarily welded. The welded metal for flange connection 12 and the flange portion 2a of the H-shaped steel bracket beam 2 are fully welded. FIG. 7C shows this stage. FIG. 9 shows FIG.
(C) shows an enlarged detailed view of the CC section. As can be seen from the figure, downward welding can be applied to welding. Of course, when welding the lower flange of the figure, the H-shaped steel beam is inverted.

Next, in the H-shaped steel bracket beam 13 with metal fittings, which are integrated with the metal fittings 12 for beam flange bonding, the metal fittings 12 for beam flange bonding are again moved to a predetermined position of the square steel tube column 1 as shown in FIG. (Same positions as in FIGS. 7A and 7B) and temporarily attached to the square steel tubular column 1 by tightening bolts 11.

Next, the hardware 12 for joining the beam flanges of the H-shaped steel bracket beam 13 with metal fittings temporarily attached to the square steel pipe column 1 with bolts 11 is respectively attached to the square steel pipe column 1.
(FIG. 7 (e)). FIG. 10 is a sectional view taken along the line DD of FIG. 7 (e), and shows a state before the beam flange joining hardware 12 and the tube wall of the square steel tubular column 1 are joined by fillet welding. Although the corners of the square steel tubular column 1 do not need to be welded, the welding amount is small, and the fillet welding is a sideways welding that does not require advanced welding skills,
In order to further facilitate the welding, a method of arranging at a slight angle from the horizontal and obliquely conceivable is considered. As described above, fillet welding is mainly used as a welding method, but when the metal fitting for beam flange joining is thick, a method in which a partial groove for welding is used for the metal fitting for beam flange joining can also be adopted. Note that FIG.
In (a) to (e), only the work of joining one H-shaped steel bracket beam 2 has been described. However, when a plurality of H-shaped steel bracket beams 2 are attached, the plurality of H-shaped steel bracket beams are used in each process. 2 is carried out.

FIG. 11 shows a beam-to-column joint between the assembled square steel tubular column 1 and the H-shaped steel bracket beam 2.
The welding of the web portion 2b of the section steel bracket beam 2 and the tube wall of the square steel tube column 1 is performed by fillet welding in the same manner as in a normal steel structure.

The beam flange joining hardware 12, the bolt 11, and the detailed dimensions of the welding portion, which is the fixing portion, constituting the column-to-beam joining portion are such that the deformation and the stress are within the allowable range with respect to the stress from the H-shaped steel beam. As described above, the rigidity of the beam-column joint can be obtained by setting based on the structural calculation. Subsequent quality inspections and construction at the site are the same as ordinary steel frames, and conventional construction methods are utilized and applied.

As described above, the present invention is a kind of the outer diaphragm joining method. In the case of the conventional outer diaphragm joining method, it is necessary to cut a steel sheet in accordance with the cross section of a square steel pipe column. In the present invention, it is only necessary that the four pieces of the beam flange joining hardware 12, which are one set of four pieces, be brought into close contact with the pipe wall of the rectangular steel pipe column 1 when they are tightened with each other by the bolts 11. If the beam flange joining hardware 12 is made aiming at a slightly shorter dimension in consideration of the length dimension tolerance of the side, the adhesion between the beam flange joining hardware 12 and the rectangular steel tube column wall 1 can be obtained. Therefore, the metal fittings 12 for joining the beam flanges can be separately manufactured without being manufactured according to the cross section, so that industrial production can be realized. As a result, the productivity of the metal fittings 12 for beam flange connection is dramatically improved, and the cost is reduced. Further, the rectangular steel tube column 1, the beam flange joining hardware 12 and the H-shaped steel bracket beam 2 were temporarily assembled by bolts 11 and tack welding, and once the bolts 11 were removed, the beam flange joining hardware 12 was tack welded. Since the H-shaped steel bracket beam 2 may be welded to the beam flange joining hardware 12 in a state where the beam 2 is placed horizontally, downward welding can be applied and welding is facilitated. Also, the flat part of the beam flange joining hardware 12 so as to be structurally safe against the maximum stress that is expected to occur during the use of the structure, such as an earthquake, occurring in the flange of the H-shaped steel beam. Since the thickness and width of the plate 6 and the flange fixing plate 9 can be determined, the mounting of the outer wall is not hindered, that is, the mounting of the outer wall is not difficult because the protruding dimension is too large. Next, the metal fitting 12 for joining the beam flange can be designed.

The details of the beam flange joining hardware 12 will be described further. In FIG. 4, the flange fixing plate portion 9 for welding and joining to the flange 2a of the H-shaped steel bracket beam 12 is an H-shaped steel beam. Is tapered from the distal end of the elongated plate portion 7 to the portion where the flange portion 2a of the H-shaped steel bracket beam 2 is fixed, so that the stress can be safely transmitted. If the H-beam bracket 2 is not fixed,
When the stress from the flange 2a of the shaped steel bracket beam 2 is small, it may be a straight line without taking a taper as shown in FIG. FIG. 6 shows a cross-sectional view of the metal fitting 12 for beam flange joining, and 6a in the figure shows a groove provided for increasing the cross section of the fillet welding. FIG. 6 (a) shows a case where the groove is provided and the vertical length of the flat plate portion 6 from the flange fixing plate portion 9 is made equal to the plate thickness dimension. The vertical length of the flat plate portion 6 can be changed without providing a groove as shown in FIG. In FIGS. 6 (a) and 6 (b), the cross section 9a at the tip end of the flange fixing plate portion 9 is a right angle, but this portion is used for butt welding with the flange 2a of the H-shaped steel bracket beam 12. Can be provided.

In this embodiment, as shown in FIG. 8 and the like, the extending plate portion 7 of the metal fitting 12 for beam flange joining forms an angle of 45 degrees with the wall surface of the rectangular steel pipe column 1. The angle does not have to be 45 degrees and can be designed at any angle.
When the metal fittings 12 for beam flange connection are arranged on the four circumferences of the columns, the distance between the joints of the metal fittings 12 for beam flange connection, as described above, is slightly smaller than that of the metal fittings for beam flange connection. The adhesion between the rectangular steel pipe column wall and the metal plate part for beam flange connection is good, and the transmission of stress between the metal parts 12 for beam flange connection through the bolt 11 is also good.

[0023]

As described above, according to the present invention, the metal fitting for beam flange joining, which is arranged on four sides of the rectangular steel pipe column, is bolted in a ring shape and is fixed to the rectangular steel pipe column, is formed from an H-shaped steel beam. Since the stress is effectively transmitted to the adjacent hardware for beam flange connection and the rectangular steel tube column, it is possible to sufficiently satisfy the stress transmission between the column and the beam, which is a requirement for the rigid beam-column connection. As described above, the present invention is a kind of the outer diaphragm joining method, and it is not necessary to cut the square steel tubular column.
Unlike the conventional outer diaphragm joining method, processing of a steel plate having a complicated shape and beveling is not required, and there is no difficulty in cutting. Also, unlike the conventional outer diaphragm joining method,
Welding of each part of the beam-column joint can be performed by downward welding with the square steel tube column placed horizontally and welding is extremely easy. Furthermore, even when the H-shaped steel beam cannot be attached to the column at the outer periphery of the building, there is no need for a large reinforcing rib as in the conventional outer diaphragm bonding method, and the beam flange bonding hardware fixed to the four surfaces of the rectangular steel tube column is not required. Since it does not protrude much outside, there is no hindrance to the attachment of the outer wall material. In this way, it is not necessary to cut the square steel pipe column, and it is easy to process and weld, has excellent structural strength, does not hinder the outer wall mounting surface, and can form a cost-effective inexpensive rigid beam-column joint. A beam-to-column joint structure between a rectangular steel tubular column and an H-shaped steel bracket beam, which is considerably more structurally safe and economical than the technology, can be obtained.

[Brief description of the drawings]

FIG. 1 is a view for explaining a conventional beam-column joint structure.
(a) is an external view of a through-diaphragm beam-column joint, and (b) is a cross-sectional view of the through-diaphragm beam-column joint.

2A and 2B are diagrams illustrating another conventional beam-column joint structure, where FIG. 2A is an external view of an outer diaphragm beam-beam joint, and FIG.
FIG. 4 is a cross-sectional view of an outer diaphragm column-beam joint.

FIG. 3 is a plan view showing a shape of an outer diaphragm used for a beam-to-column joint of the outer diaphragm in FIG. 2;

FIGS. 4A and 4B show a metal fitting for beam flange joining according to an embodiment of the present invention, wherein FIG. 4A is a plan view of the metal fitting for beam flange joining, and FIG. 4B is a front view of the metal fitting for beam flange joining.

5A and 5B show a metal fitting for beam flange bonding according to another embodiment of the present invention, wherein FIG. 5A is a plan view of the metal fitting for beam flange bonding, and FIG.
FIG. 3 is a front view of a hardware for joining a beam flange.

6A is a cross-sectional view taken along the line AA in FIG. 4, and FIG. 6B is a cross-sectional view of a modified example of the beam flange joining hardware having a unequal-length flat plate portion. is there.

FIG. 7 is a process explanatory view showing a column-beam joint construction method according to an embodiment of the present invention in the order of each process, wherein the right side in (a) to (e) is a front view at the time of construction, and the left side is the left side thereof. FIG.

FIG. 8 is a detailed view of the figure on the left side of FIG.

FIG. 9 is a detailed view of a C-C section of (c) in FIG. 7;

10 is a detailed view of a section taken along line DD in FIG. 7E.

FIG. 11 is a front view showing an example of a beam-column joint structure according to the above-described beam-column joint construction method.

FIG. 12 is an exploded perspective view of a main part of the beam-column joint structure according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectangular steel pipe column 2 H-shaped steel bracket beam 2a Flange part of H-shaped steel bracket beam 5 Welding backing metal 6 Flat plate part 6a Groove part 7 Extension plate part 8 Bolt hole 9 Flange fixing plate part 9a Flange plate tip part 10 Welded part 11 Bolt 12 Hardware for beam flange connection 13 H-beam bracket beam with hardware

Claims (3)

[Claims] Claims 1. A beam flange joining hardware fixed to four surfaces of a rectangular steel pipe column for rigidly connecting a rectangular steel pipe column and an H-shaped steel bracket beam in a steel building, wherein A flat plate portion arranged in surface contact, an elongated plate portion extending from both sides of the flat plate portion and provided with bolt holes for connecting adjacent beam flange joining hardware, and an H-shaped steel bracket beam And a flange fixing plate portion perpendicular to the flat plate portion and the extending plate portion for fixing the flange. 2. A beam-to-column joint structure in which a rectangular steel pipe column and an H-shaped steel bracket beam are rigidly connected to each other using the metal fitting for beam flange connection according to claim 1, wherein the rectangular steel pipe in a rectangular steel pipe column is provided. A beam flange joining hardware is arranged on each of four sides of the upper and lower flange portions of the H-shaped steel bracket beam to be attached to the column, adjacent beam flange joining hardware is bolted to each other, and the flat plate portion of the beam flange joining hardware is a square steel pipe. A beam-column joint structure fixed to a tube wall of a column, wherein a flange fixing plate portion of the beam flange-joining metal part and a flange of an H-shaped steel bracket beam are mutually fixed. 3. A beam-column joint connecting method for rigidly connecting a rectangular steel pipe column and an H-shaped steel bracket beam using the metal fitting for beam flange connection according to claim 1, wherein the rectangular steel pipe column is placed substantially horizontally, In this rectangular steel column, the beam flange joining hardware is arranged on each of the four faces of the upper and lower flange portions of the H-shaped steel bracket beam attached to the square steel column, and the adjacent beam flange joining hardware is bolted together, A first step of temporarily attaching two sets of four sets of beam flange joining hardware to a square steel tubular column; and a flange of an H-shaped steel bracket beam on a flange fixing plate portion of the temporarily attached beam flange joining hardware. A second step of tack-welding the part, removing the beam flange joining hardware temporarily attached to the square steel tubular column from the square steel tubular column, and joining the temporarily welded beam flange joining hardware with H A third step of main welding the flange portion of the shaped steel bracket beam, and the beam flange joining hardware in the H-shaped steel bracket beam with hardware integrated with the beam flange joining hardware is again placed at a predetermined position on the square steel tubular column. A fourth step of arranging and temporarily attaching to the square steel pipe column; and a fifth step of main welding the upper and lower two sets of beam flange joining hardware temporarily attached to the square steel pipe column to the pipe wall of the square steel pipe column, respectively. A method of constructing a beam-column joint, comprising: