JP7648024B2 - Beam-column joint structure - Google Patents

Description

The present invention relates to a column-beam joint structure.

Various column-beam joint structures are applied to the panel zone of a steel-frame building, which uses square steel pipes as the steel columns and H-shaped steel as the steel beams. Specifically, there are the first type, in which brackets are welded to the upper and lower through diaphragms that protrude laterally from the steel columns in the panel zone, and the steel beams are bolted to the brackets via splice plates; the second type, in which bolt holes in the end plates welded to the connection ends of the steel beams are aligned with bolt holes in the connection plates welded to the sides of the steel columns, and the bolts are connected; and the third type, in which bolt holes in the end plates welded to the connection ends of the steel beams are aligned with bolt holes in the steel columns, and the bolts are connected.

There are also various configurations regarding the dimensional relationship of the widths of the steel column and steel beam that are joined to each other, including a configuration in which a steel beam with a flange narrower than the width of the side of the steel column is joined, and a configuration in which both have the same width. In the latter configuration in which the steel column and steel beam have the same width and are joined via the above-mentioned end plate (the second and third configurations described above), if one were to join the entire circumference of the steel beam to the end plate by fillet welding, the width of the end plate must be made wider than that of the steel beam to take into account the overhang of the weld, and as a result, the end plate must be made wider than the width of the steel column.

However, because the end plates are wider than the width of the steel column, there is a risk that the opposing ends of the end plates will interfere with each other when, for example, attempting to attach end plates of a steel beam to each of the two adjacent sides of a steel column.

Here, Patent Document 1 proposes a column-beam joint structure that can improve the performance of a beam regardless of the width of the column and can join a beam having a width similar to that of the column to a column without increasing the construction work. Specifically, the structure includes a column and a beam fixed to one side of the column, the beam includes a beam main body portion and a plate-shaped end plate fixed to the beam main body portion and in surface contact with the outer peripheral surface of the column, the beam main body portion has a width similar to the width of the column, and the end plate includes a column contact surface portion in surface contact with the column and a beam end joint surface portion joined to the end of the beam main body portion. Here, the column contact surface portion has a width equal to or slightly smaller than the width of the column, the beam end joint surface portion has a width larger than the width of the beam main body portion, and the end plate includes a pair of side end surfaces extending along the height direction of the beam main body portion and connecting these surfaces, and the side end surface portions are formed in a state of being inclined in a widening manner from the column contact surface portion side toward the beam end joint surface portion side. Furthermore, the beams are attached in such a way that the side end faces of the end plates do not intersect with imaginary lines that are inclined 45 degrees horizontally from the normals of each face that pass through the axis of the columns, and there is a gap between adjacent end plates.

JP 2017-137756 A

According to the beam-column joint structure described in Patent Document 1, the side end surface of the end plate is formed in a state that is inclined in a widening manner from the column contact surface side toward the beam end joint surface side, so that it is possible to prevent interference between the side end surfaces of adjacent end plates while welding the end of the beam to the end plate all around. However, because the width of the end plate is wider than the width of the column, it is difficult to completely prevent interference between the end plates due to the fit between the column and beam (end plate).

The present invention was made in consideration of the above problems, and aims to provide a column-beam connection structure in which end plates are attached to the connection ends of steel beams, the end plates are bolted to the steel columns, and the widths of both the steel beams and the steel columns are the same, in which interference between adjacent end plates can be prevented.

In order to achieve the above object, one aspect of the column-beam joint structure according to the present invention is as follows:
A column-beam joint structure between a steel column formed of a square steel pipe and a steel beam formed of an H-shaped steel having a web and a flange,
An end plate is fixed to the connection end of the steel beam,
The left and right ends of the flange are provided with chamfered portions, and the width of the connecting end is narrower than the width of the general portion of the flange,
The present invention is characterized in that the widths of the general portion of the flange, the end plate, and the steel column are all the same.

According to this embodiment, the left and right ends of the flange are provided with chamfered portions, and the width of the connection end is narrower than the width of the general portion of the flange. Therefore, when the width of the general portion of the flange and the width of the steel column are the same, the end plate width can be made the same, and interference between adjacent end plates can be prevented. Here, the mounting form of the steel beam to the side of the square steel pipe in the panel zone includes all forms in which one steel beam is mounted to one side and two to four steel beams are mounted to two to four side surfaces. However, from the viewpoint of preventing interference between the end plates of adjacent steel beams in an orthogonal relationship, a form in which at least two mutually orthogonal steel beams are bolted to the steel column is preferable. Furthermore, compared to the form in which the entire length of the side end surface is processed into a tapered shape as in the end plate described in Patent Document 1, it is only necessary to cut the left and right (ends) of the connection ends of the upper and lower flanges into a tapered shape, so the manufacturing cost of the components can be reduced compared to the column-beam joint structure described in Patent Document 1.

The chamfered portions on the left and right ends of the flange can be tapered when viewed from above, curved when viewed from above, or other shapes. From the standpoint of workability, a chamfered portion that is tapered when viewed from above is preferred. The width of the connecting end of the flange is determined according to the taper angle of this chamfered portion.

Another aspect of the column-beam joint structure according to the present invention is as follows:
A column-beam joint structure between a steel column formed of a square steel pipe and a steel beam formed of an H-shaped steel having a web and a flange,
An end plate is fixed to the connection end of the steel beam,
The flange has chamfered portions at its left and right ends, the width of the connection end and the width of the end plate are both narrower than the width of the general portion of the flange, and the width of the general portion of the flange and the width of the steel column are the same.

According to this embodiment, chamfered portions are provided on the left and right ends of the flange, and the width of the connection end is narrower than the width of the general part of the flange. This makes it possible to prevent interference between adjacent end plates even when the general part of the flange and the steel column have the same width and the end plate has a narrower width than them. Here, although the width of the general part of the flange is wider than the width of the end plate, it is the same as the width of the steel column (not too wide), so there is no risk of interference between the (flanges of) steel beams that are perpendicular to each other. In addition, in this embodiment, it is only necessary to cut the left and right ends of the connection ends of the upper and lower flanges into a tapered shape, so the manufacturing costs of the components can be reduced compared to the column-beam joint structure described in Patent Document 1.

Another aspect of the column-beam joint structure according to the present invention is as follows:
The present invention is characterized in that the connection end of the steel beam is fixed to the end plate via a fillet weld provided around the entire circumference.

According to this aspect, in both cases where the widths of the general part of the flange, the end plate, and the steel column are all the same, and where the widths of the general part of the flange and the steel column are the same and the width of the end plate is relatively narrow, the entire circumference of the connection end of the steel beam can be welded to the wide surface of the end plate via a fillet weld. Note that in the latter case, where the widths of the general part of the flange and the steel column are the same and the width of the end plate is relatively narrow, although the width of the end plate is narrower than the widths of the general part of the flange and the steel beam, it is set wider than the connection end of the flange, making it possible to fillet weld the entire circumference of the connection end of the steel beam to the wide surface of the end plate.

Another aspect of the column-beam joint structure according to the present invention is as follows:
A joining plate having a plurality of first bolt holes is fixed to a side surface of the steel column,
A plurality of second bolt holes are provided at positions corresponding to the first bolt holes in the end plate,
The joining plate and the end plate are fixed together by mounting bolts that are screwed into the first bolt holes and the second bolt holes.

According to this aspect, an end plate fixed to the connection end of a steel beam is bolted to a connection plate fixed to the side of the steel column by welding or the like, thereby forming a column-beam connection structure with high connection strength between the steel column and the steel beam while avoiding a decrease in the rigidity of the steel column due to cross-sectional loss caused by opening bolt holes in the steel column.

In another aspect of the column-beam joint structure according to the present invention,
A plurality of third bolt holes are opened on a side surface of the steel column,
A plurality of second bolt holes are provided at positions corresponding to the third bolt holes in the end plate,
The steel column and the end plate are fixed by mounting bolts screwed into the third bolt holes and the second bolt holes.

According to this embodiment, the end plate fixed to the connection end of the steel beam is directly bolted to the side of the steel column, eliminating the need for other members when joining the steel column and steel beam, making it possible to construct a column-beam joint structure as inexpensively as possible.

As can be understood from the above explanation, according to the column-beam joint structure of the present invention, an end plate is attached to the connection end of the steel beam, and the end plate and the steel column are bolted together, and in a column-beam joint structure in which the steel beam and the steel column both have the same width, interference between adjacent end plates can be prevented.

1 is a cross-sectional view of an example of a column-beam joint structure according to the first embodiment, viewed from above a steel beam. FIG. 2 is a view taken along the line II-II of FIG. 1, and is a vertical cross-sectional view of an example of a beam-column joint structure according to the first embodiment. 13 is a cross-sectional view of an example of a column-beam joint structure according to the second embodiment, viewed from above a steel beam.

Below, the column-beam joint structure according to each embodiment will be described with reference to the attached drawings. Note that in this specification and the drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[Column-beam joint structure according to the first embodiment]
First, an example of a beam-column joint structure according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Here, Fig. 1 is a cross-sectional view of an example of a beam-column joint structure according to the first embodiment seen from above a steel beam, and Fig. 2 is a view taken along the line II-II in Fig. 1, which is a vertical cross-sectional view of the example of the beam-column joint structure according to the first embodiment.

The column-beam joint structure 100 is a joint structure in which a steel beam 20 is joined to two adjacent sides 11, 12 of the four sides 11, 12, 13, 14 of a steel column 10 made of a square steel pipe forming a panel zone. Here, the column-beam joint structure may be in a form in which the steel beam 20 is joined to three sides of the steel column 10, or in a form in which the steel beam 20 is joined to all four sides of the steel column 10.

The square steel pipe 10 has a generally square shape in plan view with four curved corners. For example, in addition to STKR400 and STKR490, which are JIS products based on JIS G 3466 (square steel pipes for general structure), cold-formed square steel pipes for architectural structures such as BCR (Box Column Roll, cold-roll-formed square steel pipes for architectural structures, registered trademark) and BCP (Box Column Press, cold-press-formed square steel pipes for architectural structures, registered trademark) can be applied. Here, BCR and BCP are square steel pipes manufactured by the Japan Iron and Steel Federation, a general incorporated association, based on SN material (steel material for architectural structures). In addition, one side of the square steel pipe 10 can be set in the range of about 150 mm to 1000 mm, and the wall thickness can be set in the range of about 6 mm to 50 mm.

In the steel column 10, a joining plate 30 having a rectangular shape when viewed from the front is fixed to the side surfaces 11, 12 to which the steel beam 20 is joined via a welded portion 70. For example, the welded portion 70 is formed by fillet welding the top and bottom end faces of the rectangular shape when viewed from the front to the side surface 11, and by butt welding (or flare welding) the left and right end faces of the rectangular shape when viewed from the front to the side surface 11.

On the other hand, a tabular plate 80, which is rectangular when viewed from the front, is fixed to the sides 13, 14 of the steel column 10 to which the steel beam 20 is not joined via a welded portion 75, and the tabular plate 80 reinforces the sides 13, 14 of the steel column 10 to which the steel beam 20 is not joined in the panel zone.

The end plate 40 to which the connection end 24 of the steel beam 20 is fixed is bolted to the connection plate 30, which is fixed to the sides 11, 12 of the steel column 10 via a welded joint 70, using a high-strength bolt 60.

The steel beam 20 is formed from an H-shaped steel having a web 21, an upper flange 22, and a lower flange 23, and JIS products such as SN material (rolled steel for architectural structures JIS G 3136), SS material (rolled steel for general structures JIS G 3101), and SM material (rolled steel for welded structures JIS G 3106) can be used.

In the beam-column joint structure 100, as shown in FIG. 1, the left and right sides of the connection end 24 of the flange 22 (23) of the steel beam 20 are cut or otherwise processed to have a tapered shape in a plan view, thereby providing a chamfered portion 25. Here, the chamfered portion may be formed, for example, in a curved shape.

In addition, the width of the general part of the flange 22 (23) of the steel beam 20 (width in plan view as shown in Figure 1) and the width of the end plate 40 are set to the same width t1, and the width of the steel column 10 is also set to width t1. Therefore, the widths of the general part of the flange 22 (23) of the steel beam 20, the end plate 40, and the steel column 10 are all set to the same width.

On the other hand, the width of the connection end 24 of the steel beam 20 is set to a width t2 narrower than the general portion of the flange 22 (23) of the steel beam 20 by the chamfered portions 25 on the left and right ends.

Also, as shown in FIG. 2, the heights of the rectangular joint plate 30 and the end plate 40 when viewed from the front are set to the same height s1, and the height s2 of the steel beam 20 is set to be lower than the height s1 of the end plate 40.

In this way, in plan view, the width t2 of the connection end 24 of the steel beam 20 is set narrower than the width t1 of the wide surface 41 of the end plate 40, and in side view, the height s2 of the connection end 24 of the steel beam 20 is set lower than the height s1 of the wide surface 41 of the end plate 40. Therefore, in the illustrated position where the connection end 24 of the steel beam 20 abuts against the wide surface 41 of the end plate 40, the connection end 24 is completely contained within the wide surface 41.

The entire circumference of the connection end 24 is fixed to the wide surface 41 via a fillet weld 50, but because the connection end 24 is completely contained within the wide surface 41, the fillet weld 50 is prevented from protruding from the wide surface 41, making it possible to form the fillet weld 50 around the entire circumference of the connection end 24.

As shown in Figures 1 and 2, the joining plate 30 has first bolt holes 31 in 2 x 3 locations (total of 6 locations), and the end plate 40 has second bolt holes 42 in positions corresponding to each of the first bolt holes 31. When the end plate 40 is in abutment with the joining plate 30, high-strength bolts 60 are screwed into the bolt holes that connect the corresponding first bolt holes 31 and second bolt holes 42, thereby joining the steel column 10 and steel beam 20 via the joining plate 30 and the end plate 40, and forming a column-beam joining structure 100.

As is clear from FIG. 1, an end plate 40 is attached to the connection end 24 of the steel beam 20, and the end plate 40 and the steel column 10 (the connection plate 30 fixed thereto) are bolted together, and in the panel zone where the widths of both the steel beam 20 and the steel column 10 are the same width t1, instead of widening the width of the end plate as in the above-mentioned Patent Document 1, chamfered portions 25 are provided on the left and right ends of the flanges 22, 23 at the connection end 24 of the steel beam 20, making the width of the flanges 22, 23 at the connection end 24 narrower than the width of the general parts of the flanges 22, 23, making it possible to perform fillet welding around the entire circumference of the connection end 24 to the end plate 40. In addition, since the end plate 40 does not protrude outward from the side attached to the steel column 10, interference between the opposing end faces 45 of the two adjacent end plates 40 that are perpendicular to each other can be prevented.

In the configuration described in Patent Document 1 for the column-beam joint structure 100, as described above, the side end surface of the end plate is tapered, but the width of the end plate is set wider than the width of the side surface of the steel column, so that when the end plate shifts to the side due to construction errors, etc., there is a possibility that the opposing end faces of adjacent end plates will interfere with each other.

The end plate described in Patent Document 1 is thought to have grooves cut all around the four side end faces, but such long grooves require a lot of work, which leads to high manufacturing costs. In contrast, with the column-beam joint structure 100, it is only necessary to cut the left and right ends (ends) of the connection ends 24 of the upper and lower flanges 22, 23 of the steel beam 20 into a tapered shape, which makes it possible to keep manufacturing costs as low as possible.

Furthermore, the beam-column joint structure 100 does not directly bolt the end plate to the steel column using bolt holes provided in the steel column, as described in Patent Document 1, so there is no problem of reduced rigidity due to cross-sectional loss caused by bolt holes in the steel column.

[Column-beam joint structure according to the second embodiment]
Next, an example of a column-beam joint structure according to the second embodiment will be described with reference to Fig. 3. Here, Fig. 3 is a cross-sectional view of the example of the column-beam joint structure according to the second embodiment viewed from above a steel beam.

The illustrated example of the beam-column joint structure 100A differs from the beam-column joint structure 100 in that the width t3 of the end plate 40A is set narrower than the width t1 of the general portion of the flange 22 (23) of the steel beam 20 and the steel column 10, but the rest of the configuration is the same.

More specifically, the width t3 of the end plate 40A is narrower than the width t1 of the general portion of the flange 22 (23) and the steel column 10, and is set wider than the width t2 of the connection end 24 of the steel beam 20, so that the relationship is t1>t3>t2.

By defining the relative sizes of the widths in this way, it is possible to perform fillet welding around the entire circumference of the connection end 24 to the end plate 40A, while preventing interference between the opposing end faces 45 of adjacent end plates 40A that are perpendicular to each other.

In addition, the size (plan area) of end plate 40A is smaller than that of end plate 40, which allows for the reduction of material costs as much as possible when constructing beam-column joint structure 100A.

[Column-beam joint structure according to the third embodiment]
Next, an example of a beam-column joint structure according to the third embodiment will be described without referring to the drawings. In this beam-column joint structure, the joint plate 30 is omitted from the beam-column joint structures 100 and 100A, third bolt holes corresponding to the second bolt holes 42 of the end plates 40 are provided on the sides 11 and 12 of the steel column 10, and the steel column 10 and the end plates 40 are directly bolted together with high-strength bolts 60.

As mentioned above, this beam-column joint structure has the problem of reducing the rigidity of the steel column due to the provision of bolt holes, but on the other hand, it eliminates the need for the joint plate 30, making it possible to reduce material costs as much as possible when constructing the beam-column joint structure.

Note that the configurations described in the above embodiments may be combined with other components, and the present invention is not limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately according to the application form.

10: Steel column (square steel pipe)
11, 12, 13, 14: Side 20: Steel beam (H-shaped steel)
21: Web 22: Upper flange (flange)
23: Lower flange (flange)
24: Connection end 25: Chamfered portion 30: Joint plate 31: First bolt hole 40, 40A: End plate 41: Wide surface 42: Second bolt hole 45: Opposing end surface 50: Fillet welded portion 60: High strength bolt 70, 75: Welded portion 80: Tabular plate 100, 100A: Column-beam joint structure

Claims (5)

A column-beam joint structure between a steel column formed of a square steel pipe and a steel beam formed of an H-shaped steel having a web and a flange,
An end plate is fixed to the connection end of the steel beam,
The left and right ends of the flange are provided with chamfered portions, and the width of the connecting end is narrower than the width of the general portion of the flange,
A column-beam joint structure, characterized in that the widths of the general portion of the flange, the end plate, and the steel column are all the same. A column-beam joint structure between a steel column formed of a square steel pipe and a steel beam formed of an H-shaped steel having a web and a flange,
An end plate is fixed to the connection end of the steel beam,
A column-beam connection structure characterized in that chamfered portions are provided on the left and right ends of the flange, the width of the connection end and the width of the end plate are both narrower than the width of the general portion of the flange, and the width of the general portion of the flange and the width of the steel column are the same. The beam-column joint structure according to claim 1 or 2, characterized in that the connection end of the steel beam is fixed to the end plate via a fillet weld provided around the entire circumference. A joining plate having a plurality of first bolt holes is fixed to a side surface of the steel column,
A plurality of second bolt holes are provided at positions corresponding to the first bolt holes in the end plate,
The column-beam joint structure according to any one of claims 1 to 3, characterized in that the joining plate and the end plate are fixed by mounting bolts screwed into the first bolt hole and the second bolt hole. A plurality of third bolt holes are opened on a side surface of the steel column,
A plurality of second bolt holes are provided at positions corresponding to the third bolt holes in the end plate,
The column-beam joint structure according to any one of claims 1 to 3, characterized in that the steel column and the end plate are fixed by mounting bolts screwed into the third bolt hole and the second bolt hole.

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