JPH10280528A - Post and beam connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective connecting structure which eliminates the need for a special connecting member when connecting a steel beam to post structural steel of a steel frame and reinforced concrete post and which is connectable on a construction site and which is capable of forming a frame structure and which is constructed effectively, especially, to three to four storied middle and lower layer buildings. SOLUTION: A gusset plate 7 is welded at a connecting spot with a steel beam 3 of a post steel structure in a connecting area between a frame and reinforced concrete post 1 and the steel beam 3. A fixture plate 8, which is fixedly mounted on the concrete of the frame and reinforced concrete post 1, is welded with the ends of both upper and lower flange 3b of the steel beam 3 on the steel beam 3 in the vertical direction, thereby tying up a web 3a of the steel beam 3 with the gusset plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SRC (steel reinforced concrete) column and S (steel) beam and column / beam joint structure.

[0002]

2. Description of the Related Art Conventionally, in a joint between an SRC (steel reinforced concrete) column and an S (steel frame) beam in a structure such as a building, conventionally, for example, as shown in FIG. The web 3a and the flange 3b of the steel beam 3 made of H-shaped steel or the like are tightly connected to the web 2a and the flange 2b of the column steel frame 2 made of a mold steel or the like.

[0003] In this case, a beam end 4 for joining the steel beam 3 to a joint of the web 2a or the flange 2b of the column steel frame 2 with the steel beam 3 is previously joined by welding or the like at a factory. Web 3a and flange 3 of steel beam 3 at beam end 4
b is tied with bolts 6 using a joining plate (gusset plate) 5, whereby a ramen structure is constructed as a frame of the building.

FIG. 7 shows another example of the joint structure. The joint structure includes a web 3a of a steel beam 3 and a steel column 2.
Only the web 3a using the joining plate 5
A pin connection method is adopted in which only the portions are tightened to the column steel frame 2 with the bolts 6.

[0005]

In the prior art shown in FIG. 6, it is necessary to weld the beam end 4 to the column steel frame 2 in advance at the factory for joining. Not only a specially shaped beam end 4 for separate joining is required, but also it takes time and effort to join the beam end 4 to the column steel frame 2, and the column steel frame 2 is carried into the site. At the time of transportation, the beam end 4 transports the column-shaped steel frame 2 projecting in all directions, and the transportation efficiency is not good.

In addition, since the steel beam 3 is joined to the beam end 4 at all joint surfaces of the web 3a and the flange 3b,
It also requires much labor for joining.

On the other hand, in the conventional example shown in FIG. 7, since only the web 3a of the steel beam 3 is joined to the column steel frame 2, the joining time is less than that of FIG.
Because the part of the flange 3b is not joined to the column steel frame 2,
The steel beam 3 cannot transmit the bending moment to the steel reinforced concrete column 1 at the end. For this reason, a rigid frame structure in which the bending moment is borne by the steel-framed reinforced concrete column 1 cannot be provided, and sufficient strength may not be secured.

An object of the present invention is to eliminate the disadvantages of the prior art, and when joining a steel beam to a steel column of a steel reinforced concrete column, a special joining member is not required, and the joint can be easily made on site, and An object of the present invention is to provide an effective column / beam joint structure which can be a ramen structure, and is particularly effective for a middle or low-rise building having 3 to 4 stories.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a steel beam of a steel column at the joint between an SRC (steel reinforced concrete) column and an S (steel) beam. A gusset plate is welded to the joint between the steel beam and the other end of the upper and lower flanges of the steel beam.
A fixing plate for fixing to C (steel reinforced concrete) column concrete is provided by welding vertically.
Further, the gist of the invention is that a web of a steel beam is fastened to the gusset plate.

Second, the fixing plate is provided at the edge of the upper and lower flanges of the steel beam, and thirdly, the fixing plate protrudes outward outside the ends of the upper and lower flanges of the steel beam. Fourth, the fourth feature is that the fixing plate is provided with a horizontally projecting portion at the projecting end.

According to the first aspect of the present invention, the steel beam can be joined to the column steel frame only by fastening the web of the steel beam to the gusset plate welded to the column steel frame. And, after the concrete is hardened, the fixing plate welded to the upper and lower flange ends of the steel beam is placed inside the steel reinforced concrete column. Be established. Therefore, the flange has a sufficient strength against the tensile force and the compressive force applied to the flange because the flange opposes the bearing strength and the shear strength of the concrete via the fixing plate.

According to the second aspect of the present invention, in addition to the above-described operation, the fixing plate is provided at the small opening at the end of the upper and lower flanges of the steel beam, so that the fixing plate is securely fixed in the concrete, and the concrete support is provided. Compatible with pressure strength and shear strength.

According to the third aspect of the present invention, the fixing plate is provided outside the ends of the upper and lower flanges of the steel beam so as to protrude outward. In addition, it can reliably settle in the concrete, and can resist the bearing strength and shear strength of the concrete. in this case,
Since the fixing plate does not protrude into the inside of the flange, it does not hinder the work of binding to the gusset plate.

According to the fourth aspect of the present invention, in addition to the above-described operation, by providing a protruding portion in the horizontal direction at the protruding end of the fixing plate, the fixing in the concrete can be more reliably performed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a column / beam joint structure according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. The present invention relates to an SRC (steel reinforced concrete) column and S (steel frame). The same components as those in the conventional example shown in FIGS. 6 and 7 are denoted by the same reference numerals in the joint portion with the structural beam.

A gusset plate 7 is attached by welding at a factory to a web 2a and a flange 2b of a column steel frame 2 of a steel frame reinforced concrete column 1 made of H-shaped steel and to be joined to a steel beam 3.

A fixing plate 8 is previously welded to the steel beam 3 at a factory in the vertical direction at the ends of the upper and lower flanges 3b so as to be orthogonal to the flanges 3b. As shown in FIGS. 1 and 2, for example, the fixing plate 8 is formed in an elongated plate shape having the same length as the width of the flange 3b and having a width of about 5 times the thickness of the flange 3b. It is provided at the edge 3c at the end of 3b.

In order to join the steel beam 3 to the column steel frame 2 as described above, the column steel frame 2 to which the gusset plate 7 is welded is attached.
And the steel beam 3 to which the fixing plate 8 is welded is carried into the site, and only the web 3a of the steel beam 3 is connected to the gusset plate 7 by bolts. Thereby, the steel beam 3 is tightened to the web 2 a and the flange 2 b of the column steel frame 2 via the gusset plate 7.

In order to construct the steel reinforced concrete column 1 from this state, a reinforcing bar 9 is arranged around the column steel frame 2 and the concrete is cast in a formwork, whereby the ends of the column steel frame 2 and the steel beam 3 are finished. Is buried in concrete. When the concrete has hardened, the end of the steel beam 3 to which the fixing plate 8 has been welded is fixed inside the steel reinforced concrete column 1.

In this state, the web 3a of the steel beam 3 has sufficient strength and the column steel frame 2 in the steel frame reinforced concrete column 1 is provided.
In addition, the flange 3b is fixed so as not to move against the tensile force and the compressive force applied to the flange 3b because the flange 3b resists the bearing strength and shear strength of the concrete via the fixing plate 8 at the tip. State.

As described above, until the concrete is hardened, the steel reinforced concrete column 1 and the steel beam 3 are joined by the pin only in which the web 3a of the steel beam 3 is joined to the column steel frame 2a via the gusset plate 7. In this state, after the concrete of the steel reinforced concrete column 1 is hardened, the flange 3b is also fixed and fixed in the concrete of the steel reinforced concrete column 1 by the fixing plate 8, and exhibits sufficient strength.

Thus, the bending moment from the steel beam 3 is transmitted to the steel reinforced concrete column 1 to form a rigid frame structure.

The mode of the fixing plate 8 is not limited to the above-described example, and is not the fore edge 3c but the second one.
As an example, as shown in FIG. 3, it may be provided so as to protrude outward outside the ends of the upper and lower flanges 3b. In this case, since the fixing plate 8 does not protrude inside the flange 3b, the fixing plate 8 does not hinder the operation when the fixing plate 8 is attached to the gusset plate 7.

Further, as a third example, as shown in FIG. 4, an angled shape can be adopted to increase the bonding area to the flange 3b to increase the bonding strength. As a fourth example, as shown in FIG. In addition, the fixing plate 8 can be provided with a protruding portion 8a in the horizontal direction at the protruding end to enhance the fixing property to concrete.

[0025]

As described above, the column / beam joint structure of the present invention is welded to a steel column when an SRC (steel reinforced concrete) column and an S (steel frame) beam are joined. The steel beam can be joined to the column steel only by fastening the web of the steel beam to the gusset plate. And, after the concrete is hardened, the fixing plate welded to the upper and lower flange ends of the steel beam is placed inside the steel reinforced concrete column. Since the anchor is fixed, the flange has sufficient strength against the tensile and compressive forces applied to the flange to resist the bearing strength and shear strength of concrete via the anchor plate. And the structure of the ramen can be easily configured.

Further, the fixing plate may be placed at the edge of the upper and lower flanges of the steel beam or at the outside of the upper and lower flanges.
By being provided so as to protrude outward, it is reliably fixed in the concrete, and can withstand the bearing strength and shear strength of the concrete.

By providing a projecting portion in the horizontal direction at the projecting end of the fixing plate, the fixing in concrete can be more reliably performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a column / beam joint structure of the present invention.

FIG. 2 is a view showing an embodiment of a column / beam joint structure according to the present invention;
FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a first example of a steel beam to which a fixing plate is attached, which is a main part of the column / beam joint structure of the present invention.

FIG. 4 is a front view showing a second example of a steel beam to which a fixing plate is attached, which is a main part of the column / beam joint structure of the present invention.

FIG. 5 is a front view showing a third example of a steel beam to which a fixing plate is attached, which is a main part of the column / beam joint structure of the present invention.

FIG. 6 is a perspective view showing a first example of a conventional column / beam joint structure.

FIG. 7 is a perspective view showing a second example of the conventional column / beam joint structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel reinforced concrete column 2 ... Column steel 2a ... Web 2b ... Flange 3 ... Steel beam 3a ... Web 3b ... Flange 3c ... Forehead 4 ... Beam end 5 ... Joint plate 6 ... Bolt 7 ... Gusset plate 8 ... Fixing plate 8a ... Projection 9 ... Rebar

Claims (4)

[Claims] A gusset plate is welded to a joint between an SRC (steel reinforced concrete) column and an S (steel) beam at a joint between the column and the steel beam. At the ends of the upper and lower flanges of the steel beam, anchoring plates for anchoring to the concrete of SRC (steel reinforced concrete) columns are provided by welding in the vertical direction,
A column / beam joint structure, wherein a web of a steel beam is fastened to the gusset plate. 2. The column / beam joint structure according to claim 1, wherein the fixing plate is provided at a small edge at an end of the upper and lower flanges of the steel beam. 3. The column / beam joint structure according to claim 1, wherein the fixing plate is provided so as to protrude outward outside ends of upper and lower flanges of the steel beam. 4. The column / beam joint structure according to claim 1, wherein the fixing plate has a protruding portion in a horizontal direction at a protruding end.