Column-beam joint structure

Abstract

To provide a column-beam joint structure in which an end plate is attached to the connection end of a steel beam, the end plate and a steel column are bolted together, and the steel beam and the steel column have the same lateral width, in which interference between adjacent end plates can be prevented.SOLUTION: In a column-beam joint structure 100 consisting of a steel column 10 formed by rectangular steel pipes and a steel beam 20 formed by H-shaped steel with a web 21 and flanges 22, 23, an end plate 40 is fixed to a connection end 24 of the steel beam 20, the left and right ends of the flanges 22, 23 are provided with chamfered parts 25, the lateral width of the connection end 24 is narrower than the lateral width of the general part of the flanges 22, 23, and the general part of the flanges 22, 23 has the same lateral width as both the end plate 40 and the steel column 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a column-beam joint structure. [Background technology]

[0002] Various column-beam joint structures are applied to the panel zone of a steel-frame building in which square steel pipes are used as steel columns and H-shaped steel beams are used as steel beams.Specific examples include a first form in which brackets are welded to 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, a second form in which bolt holes in end plates welded to the connection ends of the steel beams are aligned with bolt holes in connection plates welded to the sides of the steel columns, and the bolts are joined, and a third form in which bolt holes in end plates welded to the connection ends of the steel beams are aligned with bolt holes provided in the steel columns, and the bolts are joined.

[0003] There are also various configurations regarding the dimensional relationship between 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 surface of the steel column is joined, a configuration in which both have the same width, etc. In the latter configuration in which the steel column and the steel beam have the same width and are joined to each other via the above-mentioned end plate (the above-mentioned second and third configurations), if the entire circumference of the steel beam is to be joined to the end plate by fillet welding, the width of the end plate must be made wider than that of the steel beam in consideration of the weld protrusion, and as a result, the end plate must be made wider than the width of the steel column.

[0004] However, since 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, for example, when attempting to attach end plates of a steel beam to each of the two adjacent sides of a steel column.

[0005] 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 approximately equal to that of the column to the 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 approximately equal 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 to connect 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 an imaginary line that is inclined 45 degrees horizontally from the normal lines of each face that pass through the axis of the column, leaving a gap between adjacent end plates. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-137756 A Summary of the Invention [Problem to be solved by the invention]

[0007] 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 of inclination 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 the beam (end plate).

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a column-beam connection structure in which an end plate is attached to the connection end of a steel beam, the end plate and a steel column are bolted together, and the steel beam and steel column have the same width, which can prevent interference between adjacent end plates. [Means for solving the problem]

[0009] 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.

[0010] 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 is the same as that of the steel column, the end plate width can be made the same, and therefore 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 of the forms in which one steel beam is mounted to one side and the forms in which 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 portion 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, and therefore the manufacturing cost of the component members can be reduced compared to the column-beam joint structure described in Patent Document 1.

[0011] The chamfered portions provided on the left and right ends of the flange may have a shape such as a tapered chamfered portion in a plan view or a curved chamfered portion in a plan view, but a tapered chamfered portion in a plan view is preferred from the viewpoint of workability, etc. The width of the connecting end of the flange is determined according to the taper angle of the chamfered portion.

[0012] 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.

[0013] 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. This prevents interference between adjacent end plates even when the general portion 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 portion 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) the 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 cost of the components can be reduced compared to the column-beam joint structure described in Patent Document 1.

[0014] 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.

[0015] According to this aspect, in either the configuration in which the widths of the general portion of the flange, the end plate, and the steel column are all the same, or the configuration in which the widths of the general portion 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 configuration in which the widths of the general portion 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 portion of the flange and the steel beam, it is set wider than the connection end of the flange, so that the entire circumference of the connection end of the steel beam can be fillet welded to the wide surface of the end plate.

[0016] 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.

[0017] According to this embodiment, an end plate fixed to the connection end of a steel beam is bolted to a joining plate fixed to the side of the steel column by welding or the like, thereby forming a column-beam joining structure with high joining strength between the steel column and the steel beam while avoiding a decrease in rigidity of the steel column due to cross-sectional loss caused by opening bolt holes in the steel column.

[0018] 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.

[0019] 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 components when joining the steel column and steel beam, making it possible to construct the column-beam joint structure as inexpensively as possible. Effect of the Invention

[0020] As can be understood from the above explanation, according to the beam-column connection structure of the present invention, an end plate is attached to the connection end of a steel beam and the end plate and steel column are bolted together, and in a beam-column connection structure in which the steel beam and steel column have the same width, interference between adjacent end plates can be prevented. [Brief description of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view of a steel beam as viewed from above, showing an example of a column-beam joint structure according to the first embodiment. [Diagram 2] 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. [Diagram 3] 13 is a cross-sectional view of an example of a beam-column joint structure according to the second embodiment, viewed from above a steel beam. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, a column-beam joint structure according to each embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially the same components are designated by the same reference numerals to avoid redundant description.

[0023] [Beam-column joint structure according to the first embodiment] First, an example of a column-beam 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 column-beam 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 column-beam joint structure according to the first embodiment.

[0024] The beam-column joint structure 100 is a joint structure in which a steel beam 20 is joined to two adjacent sides 11, 12 of four sides 11, 12, 13, 14 of a steel column 10 made of a square steel pipe forming a panel zone. Here, the beam-column 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.

[0025] The square steel pipe 10 has a substantially 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), BCR (Box Column Roll, cold roll-formed square steel pipe for building structure, registered trademark) and BCP (Box Column Press, cold press-formed square steel pipe for building structure, registered trademark), which are cold-formed square steel pipes for building structure, 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 building structure). 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.

[0026] 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. The welded portion 70 is formed, for example, by fillet welding the upper and lower end faces of the rectangle 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 rectangle when viewed from the front to the side surface 11.

[0027] On the other hand, in the steel column 10, a tabular plate 80 which is rectangular when viewed from the front is fixed via a welded joint 75 to the sides 13, 14 to which the steel beam 20 is not joined, and the tabular plate 80 reinforces the sides 13, 14 of the steel column 10 in the panel zone to which the steel beam 20 is not joined.

[0028] An end plate 40 to which the connection end 24 of the steel beam 20 is fixed is bolted to the connecting plate 30, which is fixed to the sides 11, 12 of the steel column 10 via welds 70, with high-strength bolts 60.

[0029] The steel beam 20 is formed from an H-shaped steel beam 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.

[0030] 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 into a tapered shape in a plan view to provide a chamfered portion 25. Here, the chamfered portion may be formed, for example, in a curved shape.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In this way, when viewed in a 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 when viewed from the side, 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, when the connection end 24 of the steel beam 20 is in the illustrated position in which it abuts against the wide surface 41 of the end plate 40, the connection end 24 is completely contained within the wide surface 41.

[0035] The connection end 24 is fixed to the wide surface 41 around its entire circumference via a fillet weld 50, but since 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, and it becomes possible to form the fillet weld 50 around the entire circumference of the connection end 24.

[0036] 1 and 2, first bolt holes 31 are formed in 2 × 3 locations (total of six locations) in the joining plate 30, and second bolt holes 42 are formed in the end plate 40 at positions corresponding to the first bolt holes 31. When the end plate 40 is in abutment against the joining plate 30, high-strength bolts 60 are screwed into bolt holes that communicate with the corresponding first bolt holes 31 and second bolt holes 42, thereby joining the steel column 10 and the steel beam 20 via the joining plate 30 and the end plate 40, and forming a column-beam joining structure 100.

[0037] As is clear from Fig. 1, an end plate 40 is attached to the connection end 24 of a steel beam 20, and the end plate 40 and the steel column 10 (the connection plate 30 fixed thereto) are bolted together, and in a 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 at the left and right ends of the flanges 22, 23 at the connection end 24 of the steel beam 20 to make 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, thereby enabling fillet welding of the entire circumference of the connection end 24 to the end plate 40. In addition to this, 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 adjacent end plates 40 that are perpendicular to each other can be prevented.

[0038] With respect to the beam-column joint structure 100, in the configuration described in Patent Document 1, as described above, although the side end surface of the end plate is tapered, the width of the end plate is set wider than the width of the side surface of the steel column. Therefore, 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.

[0039] In addition, the end plate described in Patent Document 1 is considered 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, the column-beam joint structure 100 only requires cutting 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.

[0040] Furthermore, since the beam-column joint structure 100 does not directly bolt the end plates to the steel columns using bolt holes provided in the steel columns, as described in Patent Document 1, there is no problem of reduced rigidity due to cross-sectional loss caused by bolt holes in the steel columns.

[0041] [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.

[0042] The illustrated example of the column-beam joint structure 100A differs from the column-beam 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; otherwise, the configuration is the same.

[0043] More specifically, the width t3 of the end plate 40A is narrower than the width t1 of the general part 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, such that t1>t3>t2.

[0044] By specifying the relative sizes of the respective widths in this manner, 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.

[0045] Furthermore, since the size (plan area) of the end plate 40A is smaller than that of the end plate 40, the material costs can be reduced as much as possible when constructing the column-beam joint structure 100A.

[0046] [Beam-column 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, and 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.

[0047] As mentioned above, this column-beam joint structure has the problem of reduced rigidity of the steel column due to the provision of bolt holes, but on the other hand, it makes the joining plate 30 unnecessary, so it is possible to reduce material costs as much as possible when constructing the column-beam joint structure.

[0048] In addition, the present invention is not limited to the configuration shown here, and may be implemented in other embodiments in which other components are combined with the configurations and the like of the above-mentioned embodiment. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined according to the application form. [Explanation of symbols]

[0049] 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 part 30: Joint plate 31: First bolt hole 40, 40A: End plate 41: Wide surface 42: Second bolt hole 45: Opposite end face 50: Fillet weld 60: High strength bolt 70,75: Welded parts 80: Tablet plate 100, 100A: Column-beam joint structure

Claims

1. 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.

2. 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.

3. 3. The column-beam joint structure according to claim 1, wherein the connection end of the steel beam is fixed to the end plate via a fillet weld provided around the entire periphery.

4. 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.

5. 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.

Images