JP3284877B2 - Joint structure of square steel tubular column and H-section beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a rectangular steel pipe section column and an H-section beam in a building steel structure.

[0002]

2. Description of the Related Art FIG. 18 is a side view of a conventional joint between a rectangular steel tubular column and an H-shaped beam. As shown in the figure,
The structure of the joint between the rectangular steel pipe column and the H-shaped section beam is such that the diaphragm 3 is attached to the square steel pipe column 1 and the H-shaped section beam 5 is welded to the diaphragm 3. At this time, the flange portion 5a of the H-shaped section beam 5 is joined by butt welding (field welding or factory welding). Further, the web 5 b is bolted to the gusset plate 7 welded to the square steel pipe column 1 via a splice plate 9.

FIG. 19 is an explanatory view of another example of the joint between the square steel tubular column 1 and the H-shaped section beam 5. In FIG. 19, the bracket 11 is joined to the diaphragm by welding, and the H-shaped section beam 5 is bolted to the bracket 11.

FIG. 20 is an explanatory view of another example of a joint structure of a prism and an H beam disclosed in Japanese Utility Model Publication No. 52-7925. The one shown in FIG. 20 is on the side surface 1a of the prism.
The end 5d of the H beam 5 having substantially the same flange width as the side width of the prism 1 is welded and fixed, and the thickness of the prism is determined between both side edges of the H beam end and the prism side 1a. The side plate 6 having substantially the same thickness is fixed by welding. In the structure disclosed in Japanese Utility Model Publication No. 52-7925, the stress from the H beam 5 is transmitted to the corner portion of the prism 1 having the highest rigidity by the side plate 6, so that the structure has a simple structure. This enables rigid joining.

FIG. 21 shows, for example, Japanese Patent Publication No. 63-51220.
It is an explanatory view of another example of the structure which joins the H-shaped section beam disclosed in Unexamined-Japanese-Patent Publication to a square steel tube column. FIG. 21 shows a joint structure in which a rectangular steel tube column 1 and an H-shaped section beam (not shown) are joined via a diaphragm 13 integrally provided with a flange 13a above and below a web 13b. A band plate 15 is provided in the direction perpendicular to the outer end portion of 13a. The diaphragm 13 in this example is joined to the square steel tubular column 1 by welding. As another conventional technique, there is one described in Japanese Patent Application Laid-Open No. Hei 7-109767. In this publication, a steel L-shaped beam-column connection member is joined to a column by a blind bolt, and the beam is frictionally joined to a beam flange by a high-strength bolt in a single shear state.

[0006]

In the case of the joining method shown in FIG. 18, a notch 5c called scallops is formed at a portion where the web 5b hits the flange portion 5a to secure the reliability of welding. 17 backing money
Is attached, and the web is cut out to perform welding with a single welding line at the flange portion. But,
The notch 5c mechanically causes stress concentration and is a kind of defect as a continuum structure, and has a problem that it is likely to be a starting point of the whole structure destruction in the event of a large earthquake. This has been proved in the case of earthquake damage.

The method shown in FIG. 19 or FIG. 21 is a construction method in the case where scallops are not taken, and it is considered that there is no problem as shown in FIG. However, it is extremely difficult to weld the bracket 11 or the diaphragm 13 on site, and usually, a method is used in which these are welded to the square steel pipe column 1 in advance at a factory. In the case of this method, two types of joining, ie, welding at the factory and bolt joining at the site, are required for each column-beam joint, so that the construction period becomes long. In addition, the one shown in FIG. 21 has a problem that the manufacturing and construction costs are high because the shape of the diaphragm 13 is complicated. Furthermore, when the beams are attached from four directions in the joining method shown in FIG. 21, there is a problem that joining becomes difficult. Further, the one shown in FIG. 20 has a problem that it cannot be applied to a cold-formed square steel pipe and a hot-formed square steel pipe having rounded corners.

Further, in the structure disclosed in Japanese Patent Application Laid-Open No. Hei 7-109767, both the beam flange-side bolt joint and the column-side bolt joint must resist against shearing force in a one-sided friction state. The required number increases and the length of the joining member increases, which is uneconomical. In particular, when the column diameter is small, even if the minimum bolt pitch is used, the number of pieces that can be arranged in a row is limited, and the design strength may not be satisfied. In addition, the design strength of the blind bolt is evaluated to be lower than that of a high-strength bolt of the same material. For these reasons, it is presumed that this joining type is not often realized in practice. Even if the bolt is 2 by design
Even if an attempt is made to increase the number of bolts, the number of bolts cannot be increased in many cases, because the strength of the column is reduced due to the hole loss in the column.

The present invention has been made in order to solve such a problem, and is simple in construction and excellent in strength.
It is another object of the present invention to obtain a joint structure between a square steel pipe column and an H-shaped beam having a wide applicable range.

[0010]

According to the present invention, there is provided a joint structure of a rectangular steel pipe column and an H-shaped cross-section beam, wherein a side plate extending to a predetermined length in a width direction of the rectangular steel pipe column is provided on a side surface of the rectangular steel pipe column. Welded together, two extension parts of the attachment plate and two flange parts of the H-shaped section beam
Those formed by bolted and clamped by the angled connecting member.

[0011] In the joint structure of the rectangular steel pipe column and the H-shaped beam having the above-described structure, the square steel pipe is formed at the site by bolting the attachment plate and the flange portion of the H-shaped beam with an angle material. The column and the H-shaped section beam can be easily joined.
In addition, the stress of the flange portion of the H-shaped section beam gradually flows from the position away from the column to the angled hardware 23 and the attachment plate, and a relatively uniform shear stress state is formed on the side surface of the rectangular steel tube column. Is transmitted. Therefore, a large stress (local force) is not applied to the rectangular steel pipe column. In addition, there is no need to provide scallops when joining the H-section beam to the square steel tubular column, and no stress concentration occurs at the intersection of the web and the flange.

Further, in the joint structure of the rectangular steel pipe column and the H-shaped cross-section beam according to the present invention, the attachment plate is formed in a grid shape which can be inserted into the rectangular steel pipe column.

Further, the attachment plate is a plurality of substantially cross-shaped members which can be joined to the respective corners of the rectangular steel tubular column.

Further, a box-shaped connecting member is used in place of the angle-shaped connecting member.

Further, a channel-shaped connecting member is used in place of the angle-shaped connecting member.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 is a front view of a position embodiment of the present invention, FIG. 2 is a side view (however, a state before joining of the H-shaped section beam), and FIG. 3 is a state in which the H-shaped section beam is joined in one direction. FIG. Hereinafter, the present embodiment will be described with reference to FIGS. The same parts as those in FIGS. 18 to 21 showing the conventional example are denoted by the same reference numerals. In the present embodiment, the side plate 1a of the rectangular steel pipe column 1 is joined to a side plate 21 extending a predetermined length in the width direction of the rectangular steel pipe column 1,
The extension of the attachment plate 21 and the flange 5a of the H-shaped section beam 5
Are bolted together with an angled metal member 23. In addition, a gusset plate is welded to the front of the square steel tubular column 1, and the gusset plate and the web 5b of the H-shaped section beam 5 are bolted together via a single splice plate in the case of FIG. Have been.

More specifically, the attachment plates 21 are spaced apart from each other on both sides of the rectangular steel tube column 1 by a predetermined distance in the vertical direction (a distance approximately equal to the height of the H-shaped cross-section beam 5), and are each welded by two pieces. Are joined. Therefore, four attachment plates 21 are joined to the square steel tube column 1 at one joint between the square steel tube column 1 and the H-shaped section beam 5. In addition, this attachment plate 21
The joints are usually pre-installed at the factory. Further, a bolt hole 21 a is formed in the extension of the attachment plate 21. The thickness and width of the attachment plate 21 are appropriately set according to the size of the H-shaped section beam 5 to be joined. Boss holes are also formed in the gusset plate, and FIG. 2 shows an example of a state in which the attachment plate 21 and the gusset plate are joined to the square steel tube column 1.

A bolt hole is formed in the angle-shaped metal member 23 at both ends of the bent portion. When joining the H-shaped cross-section beam 5 to the square steel tubular column 1, the attachment plate 21 and the flange 5a of the H-shaped cross-section beam 5 are arranged so as to be sandwiched by two angle-shaped metal members 23, and 2
The bolts are inserted through both ends of 3 to join the bolts. The joining state at this time is as shown in FIG. Although not shown in FIG. 3, the gusset plate and the web 5b of the H-shaped section beam 5 are also joined via the splice plate.

In the embodiment constructed as described above, the attachment plate 21 is welded in advance at the factory, and only bolt connection is performed at the site, so that construction defects such as welding defects hardly occur. Thus, a highly reliable structure can be constructed. Further, since the shape of the attachment plate 21 is simple and welding at the factory is very simple, construction can be performed in a short construction period and cost can be reduced. Furthermore, since the bolt and the bolt hole diameter usually have a certain clearance, when joining the H-shaped section beam 5 to the square steel tubular column 1, it is easy to absorb errors in the horizontal direction and the vertical direction. There is also an advantage that the workability is good as compared with.

The stress of the flange 5a of the H-shaped section beam 5 gradually flows from the position away from the column to the angled metal 23 and the attachment plate 21, and a relatively uniform shear stress is applied to the side surface of the rectangular steel tube column 1. In this state, stress is transmitted to the square steel tubular column 1. Therefore, even when the width of the flange 5a of the H-shaped section beam 5 is smaller than the width of the side surface of the square steel tubular column 1,
A large stress (local force) is not applied to the rectangular steel tube column 1. According to the connection structure of the present embodiment, FIG.
As shown in (1), there is no need to provide scallops, and there is no fear of breaking from the intersection of the web and the flange. Therefore, it can be said that this embodiment has a highly reliable structure.

It is needless to say that the same can be applied to the case where concrete is filled in the steel pipe of the square steel pipe column 1.

Embodiment 2 FIG. FIG. 4 is a front view of another embodiment of the present invention. In the present embodiment, an example is shown in which the H-shaped cross-section beam 5 is arranged so as to be shifted to the left side in the drawing from the axis of the rectangular steel tube column 1. In this case, as shown in the figure,
The horizontal sides of the angled metal pieces 23 arranged on the right side in the drawing may be set to the long dimension, and the horizontal sides of the angled metal pieces 3 arranged on the left side may be set to the short dimension. According to this embodiment, since the H-shaped section beam 5 can be displaced in the left-right direction from the axis of the square steel tube column 1, the degree of freedom of arrangement of the H-shaped section beam 5 and the square steel tube column 1 is increased. growing.

Embodiment 3 FIG. FIG. 5 is a front view showing a joint state of the attachment plate and the angle in another embodiment of the present invention. In the present embodiment, a pair of angled hardware 23 sandwiching each flange portion 5a of the H-shaped cross-section beam 5 is arranged so that the directions of the angled portions a are opposite to each other. By doing so, the attachment plate 21 can be extended in the vertical direction, so that the thickness of the attachment plate can be suppressed.

In the first to third embodiments, the case where the H-shaped section beam 5 is joined to one side surface of the square steel tubular column 1 has been described as an example, but the present invention is not limited to this. . For example, when joining the H-shaped cross-section beam 5 to two orthogonal side surfaces of the square steel tubular column 1, as shown in FIGS. 6 to 9, the attachment plates 21 may be welded to the respective orthogonal surfaces. Good. In FIG. 6, the attachment plates 21 to be welded to the respective surfaces are vertically shifted from each other. In this case, the joining positions of the two adjoining attachment plates 21 are vertically displaced from each other, but by adjusting the length of the vertical side of the angled metal piece 23, The joining heights of the H-shaped section beams 5 to be joined can be matched. FIG. 7 shows an H-shaped cross-section beam 5 attached to the attachment plate 21 installed by the method shown in FIG.
It is a perspective view which shows the state which installed.

As shown in FIG. 8, by increasing the width (length in the vertical direction) of the joining portion of the attachment plate 21 with the square steel tube column 1, the connection between the attachment plate 21 and the square steel tube column 1 is increased. The load borne by the weld is reduced, and the structure can withstand a large load. 6 and 8 are attached plates 21 installed on two orthogonal side surfaces of the rectangular steel tubular column 1.
In the above example, the attachment plates 21 are shifted in the vertical direction. However, when the attachment plates 21 are not shifted, the arrangement may be as shown in FIG. Further, when the attachment plate 21 in one or two directions is welded to the attachment plate 21 orthogonal to the orthogonal direction, if the attachment plate 21 is shifted inward of the column diameter as shown in FIG. Become. Then, even if the column diameter is large, the existing angle iron can be used, and the cost and man-hours for bending the angle-shaped hardware 23 at the factory can be reduced.

Further, as shown in FIG. 11, the attachment plate 21 may be preliminarily processed into a cross-girder shape, and the processed one may be inserted into the rectangular steel tube column 1 and assembled. This makes it possible to reduce the floor height of each floor by aligning the upper end heights of the beams in the orthogonal direction, thereby enabling more economical design.

Furthermore, as shown in FIG. 12, the attachment plate 21 may be formed in a cross shape, and the member formed in this manner may be installed on the side surface of the rectangular steel tube column 1. According to this example, inconvenience at the time of joining due to a dimensional error of the steel pipe can be prevented.

As shown in FIG. 13, one of the angled hardware 23 disposed inside the attachment plate 21 may be replaced with a box-shaped connecting member 30. This box-shaped connecting member 30 is shown in FIG.
As shown in FIG. 3, bolt holes are provided in a pair of opposed side surfaces and a bottom surface of the rectangular bottomed frame. Then, a rib member 30 for connecting a pair of side surfaces having no bolt hole is provided.
a is provided. The rib member 30a has a function of increasing the rigidity of the box-shaped connecting member 30. By using such a box-shaped connecting member 30, not only the effect of reinforcing the frame is achieved, but also the number of members can be reduced. Note that, instead of the box-shaped connecting member 30, a channel-shaped connecting member 31 as shown in FIG. 14 may be used. This channel-like connecting material 3
In the case of 1, almost the same effect as the box-shaped connecting member 30 is expected. In the case of the channel-shaped connecting member 31, there is an effect that the production is simple and the cost can be reduced.
13 and 14 have been described with reference to the example of the attachment plate 21 installed by the method shown in FIG. 6, but the box-shaped connecting member 30 and the channel-shaped connecting member 31 are shown in FIG. The attachment plate 2 having the shape shown in FIGS.
Needless to say, it can be used for 1 as well.

FIG. 15, FIG. 16 and FIG. 17 are plan views showing the joint state of the square steel tubular column 1 and the H-shaped section beam 5. FIG. And
FIG. 15 shows an example in which H-shaped section beams 5 are joined to four surfaces of a rectangular steel tube column 1, FIG. 16 shows an example in which H-shaped beams 5 are joined to three surfaces of a square steel tube column 1, and FIG. The example which joined the H-shaped cross-section beam 5 to two surfaces is shown, respectively.

[0030]

As described in detail above, in the present invention, the attachment plate is welded to the side surface of the square steel pipe column in advance, and the extension of the attachment plate and the flange of the H-shaped section beam are connected.
Since the bolts are joined by being sandwiched between the two angle-shaped connecting members, the construction is simple, the strength is excellent, and the joint structure of the square steel pipe column and the H-shaped beam having a wide applicable range is obtained.

Further, even when the lateral width of the square steel tubular column does not match the flange width of the H-shaped section beam, the two can be joined by changing the side length of the angle material.
Therefore, it is not necessary to make the side width of the square steel tubular column coincide with the flange width of the H-shaped section beam, and the flange width of the H-shaped section beam can be freely selected. In addition, the beam core and the column core can be shifted, and the height position of the flange of the H-shaped section beam can be freely moved. Furthermore, the square steel pipe can join an H-shaped cross-section beam regardless of a rounded steel pipe or a welded steel pipe, and has a wide application range.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view of one embodiment of the present invention (provided that
(Before joining of H-shaped section beam).

FIG. 3 is a perspective view showing a joined state in one embodiment of the present invention.

FIG. 4 is a front view of another embodiment of the present invention.

FIG. 5 is a front view of another embodiment of the present invention.

FIG. 6 is a perspective view showing a joint state of an attachment plate according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a joint state of beams in another embodiment of the present invention.

FIG. 8 is a perspective view showing a joint state of an attachment plate according to another embodiment of the present invention.

FIG. 9 is a perspective view showing another embodiment of the attachment plate in another embodiment of the present invention.

FIG. 10 is a perspective view showing a joint state of an attachment plate according to another embodiment of the present invention.

FIG. 11 is a perspective view illustrating an attachment plate according to another embodiment of the present invention.

FIG. 12 is a perspective view showing a joint state of the attachment plates according to another embodiment of the present invention.

FIG. 13 is a perspective view of an example using a box-shaped connecting member according to another embodiment of the present invention.

FIG. 14 is a perspective view of an example using a channel-like connecting member according to another embodiment of the present invention.

FIG. 15 is a plan view showing a joint state of H-shaped beams in the present embodiment. (4 directions)

FIG. 16 is a plan view showing a joint state of the H-shaped beams in the present embodiment. (3 directions)

FIG. 17 is a plan view showing a joint state of H-shaped beams in the present embodiment. (2 directions)

FIG. 18 is a side view of a joint between a conventional rectangular steel pipe column and an H-shaped section beam.

FIG. 19 is an explanatory view of another example of a conventional joint between a square steel tubular column and an H-shaped section beam.

FIG. 20 is an explanatory diagram of another example of a conventional joint structure between a prism and an H beam.

FIG. 21 is an explanatory view of another example of a conventional structure for joining an H-shaped cross-section beam to a square steel tubular column.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rectangular steel tube column 5 H-section beam 5a H-section beam flange 5b H-section beam web 21 Attached plate 23 Angle hardware 27 Bolt

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hisaya Kamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-7-109769 (JP, A) JP-A Heihei 4-327621 (JP, A) Japanese Utility Model Showa 50-93911 (JP, U) Japanese Utility Model Showa 49-59307 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/24 E04B 1/38-1/60

Claims (5)

(57) [Claims] 1. An attachment plate extending by a predetermined length in the width direction of the rectangular steel pipe column is welded to a side surface of the rectangular steel pipe column, and an extended portion of the attachment plate and a flange portion of the H-shaped section beam are connected to each other by two. A joint structure of a square steel tubular column and an H-shaped beam, which is sandwiched between two angle-shaped connecting members and joined by bolts. 2. The attachment plate according to claim 1, wherein the attachment plate is formed in a cross-girder shape that can be inserted into the square steel tubular column.
A joint structure between the rectangular steel pipe column described above and an H-shaped section beam. 3. The joint between a rectangular steel pipe column and an H-shaped beam according to claim 1, wherein the attachment plate is composed of a plurality of substantially cross-shaped members that can be connected to respective corners of the rectangular steel pipe column. Construction. 4. The joint structure according to claim 1, wherein a box-shaped connecting member is used in place of the angle-shaped connecting member. 5. The joint structure according to claim 1, wherein a channel-like connecting member is used in place of the angle-like connecting member.