JP2003184177A - Structure for connecting column and beam in steel-frame building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute bolt connection and welded connection on a job site to optimal places so that the respective advantages of them can be obtained, when a column and a beam are connected together, allow an upper flange of the beam to be connected without interference with the beam and a roofing material, and connect a lower flange of the beam in a relatively easy and firm manner. <P>SOLUTION: Upper and lower horizontal plates 12 and 13 are mounted on the steel column 11 by welding at an interval in between, and a vertical web plate 14 is mounted between the plates 12 and 13 in a state in which its end abuts on a side surface of the column 11. The steel beam 15 is connected to the steel column 11 by welding the upper flange 15a of the beam 15 to the plate 12, bolt-connecting the lower flange 15c to the plate 13, and bolt-connecting a web 15b to the plate 14. A high-friction bolt is used as a bolt for connecting the lower flange 15c of the beam 15 to the plate 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of columns and beams in a steel building.

[0002]

2. Description of the Related Art Conventionally, a non-bracket method, which is advantageous in terms of cost, is known as a joint structure of columns and beams in a steel frame building. In this non-bracket method, a beam web is generally used for high-strength bolt connection, and a beam flange is generally welded on site.

[0003]

However, in-situ welding of the lower flange of the beam is technically difficult in terms of construction, and is a major factor in that it takes time in the construction process. Also,
In-situ welding of the lower flange of the beam is a part where the non-scallop method, which is superior in quality, cannot be adopted, and some solution has been sought.

On the other hand, if the upper and lower flanges of the beam are joined by high-strength bolts, in the case of the upper flange, the bolts interfere when setting the floor or roofing material, and an auxiliary material is necessary to avoid this. Therefore, it is disadvantageous in terms of cost. In addition, in the case of joining using a normal high-strength bolt, the number of bolts increases, and the weight of the splice plate increases, and the construction efficiency decreases.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to optimize the bolt joining and the on-site welding joining when joining columns and beams. It can be distributed to locations and the upper flange of the beam can be joined without interfering with the floor or roof material.
Moreover, it is another object of the present invention to provide a column-beam joint structure in a steel building in which the lower flange of the beam can be joined relatively easily and firmly.

[0006]

In order to solve the above-mentioned problems, in the invention according to claim 1, an upper horizontal plate and a lower horizontal plate are attached to a steel column by welding at a distance from each other, and these upper horizontal plates are attached. And a vertical web plate between the lower horizontal plates, with its ends abutting the side surfaces of the columns, a steel beam having its upper flange welded to the upper horizontal plate, and the lower flange described above. The lower horizontal plate is bolted to the vertical web plate, and the web is bolted to the vertical web plate to be joined to the steel column.

According to a second aspect of the present invention, in the column-beam joint structure of the steel frame building according to the first aspect, a high friction bolt is used as a bolt for joining the lower flange of the beam to the lower horizontal plate. It is characterized by that.

According to a third aspect of the present invention, there is provided a joint structure of a column and a beam in a steel building in which at least two steel beams having different beam formations are joined to the steel column. The upper horizontal plate and the lower horizontal plate are mounted by welding at a distance from each other, and the vertical web plate is mounted between the upper horizontal plate and the lower horizontal plate with their ends abutting on the side surface of the column, The higher steel beam is welded with its upper flange to said upper horizontal plate and its lower flange is bolted to said lower horizontal plate, and said web is bolted to said vertical web plate to produce said steel. Of the steel beam with the lower girth, joined to the column of the above, and the upper flange of the beam is welded to the upper horizontal plate. The steel column by bolting to an intermediate horizontal plate, which is welded to the side of the column between the upper horizontal plate and the lower horizontal plate, and further bolting the web to the vertical web plate. It is characterized by being joined to.

In the present invention, since the upper flange of the beam is welded in the field, there is no protrusion such as a bolt protruding upward from the upper flange of the beam, which is an obstacle in setting the floor or roofing material. There is no such thing. In addition, since the upper flange of the beam is easier to weld than the lower flange, there is no problem in construction work. Further, since the lower flange of the beam is bolted to avoid on-site welding, which is relatively troublesome to construct, the construction is easy and the construction time can be shortened. When joining the lower flange of the beam, if you use high-friction bolts instead of normal high-strength bolts, the number of bolts can be reduced, and the protrusion of the column diaphragm (lower horizontal plate) can be reduced, for example during transportation. Handling is also improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 shows a first embodiment of a joint structure of columns and beams in a steel building according to the present invention. (A) is a side view, (b) is (a) FIG. 6B is a sectional view taken along the arrow B, and FIG. 7C is a sectional view taken along the arrow C in FIG.

In these drawings, reference numeral 11 denotes a steel column having a circular cross section. Upper and lower horizontal plates 12 and 13 are attached to the pillar 11 by welding at predetermined intervals in the vertical direction. Here, the upper and lower horizontal plates 12 and 13 are made of steel and have a substantially square shape, and the corners are cut out (FIG. 1).
(See (b)).

The upper and lower horizontal plates 12 and 13 shown in this figure are examples in which the beams 15 extend from the pillar 11 in four directions at 90 ° intervals, and therefore, the upper and lower horizontal plates 12 are provided. , 13 have a substantially square shape. In addition, for example, when the pillar 11 is on the side edge or corner of the building and the beam 15 extends from the pillar 11 only in three directions or two directions, the upper and lower horizontal plates 12 and 13 are also adjusted accordingly. A shape different from a substantially square shape such as a substantially triangular shape or a rectangular shape is used.

Also, the upper and lower horizontal plates 12, 1
The reference numeral 3 does not necessarily have to be a substantially square shape or a triangular shape. For example, although not shown in the drawing, a base is a square shape, and each central portion of four sides is cut out in an arc shape. It may be. Weight can be reduced by using the horizontal plates 12 and 13 having such a shape.

The upper and lower horizontal plates 12, 13
In between, a vertical web plate 14 is butt-welded to the side face of the column 11 at its end and is vertically attached at every 90 degrees in the circumferential direction. Further, in the first embodiment, the abutting portion between the vertical web plate 14 and the upper and lower horizontal plates 12 and 13 is also welded. Here, the vertical web plate 14 is made of steel, and its height is set to be approximately the same as the distance between the upper and lower horizontal plates 12, 13. The distance between the upper and lower horizontal plates 12 and 13 is set to be approximately the same as the height of the beam 15.

At the ends of the fixed upper and lower horizontal plates 12 and 13 and the vertical web plate 14 that project outward, the upper and lower flanges 15a and 15c of the steel beam 15 having an H-shaped cross section and the web. The ends of 15b are butted against each other. Of the parts that are abutted against each other, the ends of the upper flange 15a and the upper horizontal plate 12 are joined together by in-situ welding (indicated by symbol A in FIG. 1B), and the lower flange 15c and the lower horizontal plate 1 are joined together.
The ends of 3 are bolted together via a splice plate 16 which is arranged over both members, and the ends of the web 15b and the vertical web plate 14 are arranged over both members. It is bolted through the splice plate 17, so that the pillar 1
1 and the beam 15 are rigidly joined.

Here, a high friction bolt is used as the bolt 18 for joining the lower flange 15c of the beam 15 and the ends of the lower horizontal plate 13, and the web 15b of the beam 15 and the ends of the vertical web plate 14 are joined. A normal high-strength bolt is used as the bolt 19 (see FIG. 1A). The high friction bolt has a roughened back surface of the head, for example,
A high frictional force can be obtained between the splice plate and the splice plate which faces it. In addition, FIG.
(C) Reference numeral 20 indicates upper and lower flanges 15a of the beam 15,
It is a reinforcing member attached to increase the welding area of 15c.

In addition, in the joint structure of the pillar and the beam having the above structure,
There are various welding points, but in-situ welding is basically a welding point between the end portions of the upper flange 15a of the beam 15 and the upper horizontal plate 12, and other welding points are, for example, factories and the like. Welded in different places. This also applies to the second embodiment described later.

According to the above-described column-beam joint structure in the steel frame building, the end portions of the upper flange 15a and the upper horizontal plate 12 among the mutually butted portions are connected to each other as shown in FIG.
(B) Joined by in-situ welding as shown by A.
In this way, the on-site welding point is stopped only at this part and the other joints are bolted, and the on-site welding work point, which takes a relatively long time to perform, is kept to a minimum, so the construction time can be shortened. The temporary work can be simplified.

Further, as described above, in-situ welding is used to join the ends of the upper flange 15a and the upper horizontal plate 12 to each other.
There is no protrusion projecting upward from the upper horizontal plate 12, and there is no inconvenience that the protrusion interferes when setting the floor or roofing material on the upper side.

Further, among the parts to be abutted against each other, the lower flange 15c and the end portions of the lower horizontal plate 13 are joined together by a high friction bolt 18 via a splice plate 16. Lower flange 15c and lower horizontal plate 1
When performing on-site welding with No. 3, the construction is difficult because the welding position is located at the lower part of the beam, but with bolt connection, the nut is simply screwed into the bolt, and construction is relatively easy. . In addition, here, in particular, high friction bolts 18 are used instead of the normal high-strength bolts at the end portions of the lower flange 15c and the lower horizontal plate 13, so that the number of bolts can be reduced and The amount of protrusion of the horizontal plate 13 (diaphragm) from the column 11 can be reduced. Therefore, the weight can be reduced and the handling at the time of transportation is also improved.

Further, the above construction is applicable to both the so-called through diaphragm type and the outer diaphragm type. Further, when the construction is carried out by using the beam side plate construction method. Is also suitable.

<Second Embodiment> FIG. 2 shows a second embodiment of a joint structure of a column and a beam in a steel building according to the present invention, in which a steel column 21 has a beam structure. An example of joining at least two different steel beams 25 and 26 is shown. 2A is a side view, FIG. 2B is a view taken in the direction of arrow B in FIG. 2A, and FIG. 2C is a sectional view taken in the direction of arrow C in FIG.

In this figure, reference numeral 21 indicates a steel column having a square cross section. Upper and lower horizontal plates 22 and 23 are attached to the column 21 by welding at predetermined intervals in the vertical direction. Here, the upper horizontal plate 22 is made of steel and has a substantially square shape with its corners cut off (see FIG. 2B). Also, the lower horizontal plate 2
3 is a substantially rectangular shape with its corners cut out. That is, as is apparent from FIGS. 2A and 2C, the lower horizontal plate 23 has a large protrusion amount to the beam 25 side with a high beam formation, but a protrusion amount to the beam 26 side with a small beam formation. Is very small and almost flush with the side of the pillar when set. The upper and lower horizontal plates 22 and 23 in the second embodiment are not limited to the substantially rectangular shape, and various shapes can be considered.

The upper and lower horizontal plates 22, 23
In between, a vertical web plate 24 is butt-welded with its end portion to the side surface of the column 21 and vertically attached at every 90 degrees in the circumferential direction. Further, in the twenty-first embodiment, the abutting portion between the vertical web plate 24 and the upper and lower horizontal plates 22 and 23 is also welded. Here, the vertical web plate 24 (24a, 24a
In b), two types having different heights are used. The vertical web plate 24a having a higher height is for the beam 25 having a higher beam, and the vertical web plate 24 having a lower height is used.
b is for the beam 26 having a low beam formation. The height of the vertical web plates 24a is set to the same level as that of each beam.

The upper beam 25 of the higher beam is welded on-site with its upper flange 25a abutting the upper horizontal plate 22 at its end and the lower flange 25a.
c is abutted on the lower horizontal plate 23 at the end and bolted via a splice plate 29, and the web 25b is abutted on the higher vertical web plate 24a at the end and the splice plate 3
It is joined to the steel column 21 by bolting through 0.

On the other hand, the lower beam 26 has a lower flange 26c while the upper flange 26a of the beam 26 is welded to the upper horizontal plate 22 at the end thereof while being welded on site.
Is bolted to the intermediate horizontal plate 28, which is welded to the side surface of the column 21 by the fin plate 27, between the upper horizontal plate 22 and the lower horizontal plate 23, and the web 26b.
Is bolted to the vertical web plate 24b via a splice plate 31 to be joined to the steel column 21.

The fin plate 27 is for rigidly joining the intermediate horizontal plate 28 to the steel column 21, and the inner side surfaces thereof are butt-welded to the left and right ends of the intermediate horizontal plate 28 and their tips are It extends to the side of the pillar 21 and is butt-welded to the left and right side surfaces of the pillar 21 by butting.

With this structure, even when two types of beams 25 and 26 having different beam configurations are joined to the steel column 21, the lower flanges 25c and 2c of the beams 25 and 26 are joined together.
It is possible to join both beams 25 and 26 to the column 21 without performing a troublesome work such as individually providing a diaphragm corresponding to 6c on the column 21 side or attaching a vertical haunch to the beam. is there.

By the way, the work of providing three or more diaphragms on the side of the column 21 and attaching a vertical haunch to the beam is not only complicated in terms of machining and processing, but also complete barbed welding for welding of the groove However, the quality and other problems such as the use of C. are disadvantageous in that they are costly and time consuming.

[0030]

According to the first aspect of the invention, since only the upper flange of the beam is welded on site, there is no protrusion such as a bolt protruding upward from the upper flange of the beam.
Therefore, there is no hindrance when setting the floor or roofing material, and the temporary construction can be simplified. In addition, since the upper flange of the beam is easier to weld than the lower flange, there is no problem in workability of construction. Further, since the lower flange of the beam is bolted to avoid on-site welding, which is relatively troublesome to construct, the construction is easy and the construction time can be shortened.

According to the second aspect of the present invention, when the lower flange of the beam is joined, a high friction bolt is used in place of a normal high strength bolt, so that the number of bolts can be reduced, and the column diaphragm (lower horizontal). The amount of protrusion of the plate) can be reduced, and there is an advantage that handling during transportation is improved.

According to the third aspect of the invention, when at least two beams having different beam formations are joined to the column, the beam formation is not provided for the lower flange of the lower beam formation beam. The lower beam can be joined, and in-situ welding can be performed easily because only the upper flanges of the two beams are required, and the construction time can be shortened. In addition, welding control can be confirmed from the outside, which is excellent in terms of quality.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a joint structure of columns and beams in a steel building of the present invention.

FIG. 2 is a diagram showing a second embodiment of a joint structure of columns and beams in a steel building of the present invention.

[Explanation of symbols]

11,21 Steel columns 12,22 Upper horizontal plate 13,23 Lower horizontal plate 14, 24 (24a, 24b) Vertical web plate 15 beams 15a, 25a, 26a Beam upper flange 15b, 25b, 26b Beam web 15c, 25c, 26c Beam lower flange 18 High friction bolt 25 Higher beam 26 The lower beam 16,17,30 Splice plate 27 fin plate 28 Middle horizontal plate

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2E125 AA04 AA14 AB01 AB16 AB17                       AC15 AC16 AG03 AG04 AG12                       AG32 AG41 AG49 AG57 BB02                       BB09 BB21 BC09 BD01 BE02                       BE08 BF04 BF08 CA05 CA13                       CA14 CA90 EA33

Claims (3)

[Claims] 1. An upper horizontal plate and a lower horizontal plate are attached to a steel column by welding at an interval from each other, a vertical web plate is provided between the upper horizontal plate and the lower horizontal plate, and an end portion thereof is a side surface of the column. The steel beam is welded to the upper horizontal plate, the lower flange is bolted to the lower horizontal plate, and the web is bolted to the vertical web plate. Thus, the joint structure of columns and beams in a steel building is characterized by being joined to the steel columns. 2. The column-beam connection structure for a steel building according to claim 1, wherein a high-friction bolt is used as a bolt for connecting the lower flange of the beam to the lower horizontal plate. Joint structure of columns and beams in a building. 3. A column-beam joining structure in a steel frame building, wherein at least two steel beams having different beam formations are joined to a steel column, wherein the steel column is provided with an upper horizontal plate and a lower horizontal plate. The plates are attached by welding at a distance from each other, and the vertical web plates are attached between the upper horizontal plate and the lower horizontal plate with their ends abutting the side faces of the column, The beam is joined to the steel column by welding the upper flange to the upper horizontal plate and bolting the lower flange to the lower horizontal plate, and further bolting the web to the vertical web plate, Weld the lower steel beam made of steel by welding the upper flange to the upper horizontal plate and the lower flange to the side of the column with the fin plate. Bolted to an intermediate horizontal plate disposed between the upper horizontal plate and the lower horizontal plate, and further, the web is bolted to the vertical web plate, thereby joining the steel columns. Column-beam connection structure in a steel building.