JPH07173875A - Connection of reinforced concrete column and steel frame beam - Google Patents

Abstract

PURPOSE:To increase the shearing final strength of a joint between connections of a reinforced concrete column and a steel frame beam. CONSTITUTION:Window holes 11 are respectively formed in four corner surfaces of a beam joint fitment body 10 in the shape of a vertical pipe in a square in cross section and cross-form reinforcing middle plates 12 are disposed at upper and lower parts. A steel frame beam joining material 20 made of an H-steel is formed in such a manner that a web part 21 having a hoop insertion hole 23 in a state that a slight margin part remains at each of upper and lower part is positioned in a vertical direction and two flange parts 22 each having a main reinforcing bar insertion hole 24 are positioned in a horizontal direction. One end face of the steel frame beam joining material is welded on the outer surface of a vertical surface 13 of a beam joining fitment body 10 and the other side of the steel frame beam joining material 20 is embedded in a state to protrude in a reinforced concrete column.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint between a reinforced concrete column and a steel frame beam.

[0002]

2. Description of the Related Art Heretofore, as a joint between a reinforced concrete column and a steel frame beam of this kind, the one shown in FIG. 3 has been proposed. In this "FIG. 3" conventional example, a pipe-shaped beam-joining metal fitting body 10a is embedded in a central portion of a reinforced concrete column 1, and an H-shaped steel (or a pair of horizontal plates and one vertical plate) is attached to the beam-joining metal fitting body 10a. (Combined with
A steel beam joint material 20a made of, for example, is welded, and a steel frame beam (not shown) is welded or bolted to the steel beam joint material 20a.

[0003]

However, the conventional connection between a reinforced concrete column and a steel beam has a problem in strength. That is, in the above-mentioned conventional example, the steel frame beam bonding material 2
0a is the main bar 2a, 2a adjacent to the reinforced concrete column 1
Since it must be set within the width that passes between the steel beam and the end face width of the steel beam, it may not be possible to ensure the strength at the end face joint of this steel beam. There is a restriction such that the stirrup 2b cannot be arranged around the main body 10a (specifically, the portion between the upper and lower ends of the steel frame beam joint material 20a including the vertical web of the H-shaped steel). It cannot be said to have sufficient strength against external force such as compression or expansion from the side.

Therefore, the present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to provide a joint between a reinforced concrete column and a steel frame beam in which the ultimate shear strength of the joint is increased.

[0005]

In order to solve the above-mentioned problems, the structure of the present invention, which has the above-mentioned claims as its gist, has been constructed in order to solve the above-mentioned problems. A cross-shaped reinforcing middle plate 12 for connecting the inner surfaces of a pair of vertical surfaces 13, 13 which are provided in the upper and lower portions of the beam-joining metal fitting body 10 to each other by providing window holes 11 in the four corners respectively.
Is provided on the outer surface of the vertical surface 13 of the main body 10 of the beam joint fitting, leaving some margins at the upper and lower portions, and the stirrup insertion hole 23 is formed.
One end surface of the steel beam joint material 20 made of H-shaped steel, which is positioned in the horizontal direction, is welded to the web portion 21 having the above and the two flange portions 22 having the main bar insertion holes 24 in the horizontal direction. The technical means is employed in which the other end side of the steel beam joint material 20 is projected and embedded in the reinforced concrete column 1.

[0006]

Therefore, the connection between the reinforced concrete column and the steel beam of the present invention is such that the stirrup insertion hole 23 is provided with the stirrup 2b and the main reinforcement insertion hole 2 is provided.
When the reinforcing bars 4 are arranged through the main bars 2a and the concrete C is cast to form the reinforced concrete columns 1, the beam-joining metal fitting body 10 is located inside the concrete C which is surrounded and constrained by the main bars 2a and the band bars 2b. Therefore, there is an effect that the force from the steel beam is directly transmitted to the concrete C portion restrained by the main reinforcement 2 and the stirrup 2b.

Further, in the present invention, the tensile force from the steel frame beam is transmitted to the entire beam-joining metal fitting body 10 through the steel plate of the pipe-shaped beam-joining metal fitting body 10 as in the prior art.
Particularly, in the present invention, since the reinforcing middle plate 12 is provided, the reinforcing middle plate 12 exerts a large stress load on the tensile force and exhibits an action of preventing the steel frame beam from coming out.

Further, according to the present invention, window holes 11 are respectively provided at four corners of a pipe-shaped beam-bonding metal fitting body 10 having a quadrangular cross-section, and only the upper and lower parts of the beam-bonding metal fitting body 10 are provided between facing surfaces. Since the cross-shaped reinforcing middle plate 11 for connecting the two is provided, concrete can pass between the window hole 11 and the upper and lower reinforcing middle plates 11, and the filling property of the concrete C is not impaired.

Further, in the present invention, the stirrup 2b also functions as a shear reinforcement.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings. In the figure, 1 is a reinforced concrete column, and 10 is a beam-joining metal fitting body embedded in the reinforced concrete column 1.

The above-mentioned reinforced concrete column 1 is a conventionally known one, and the reinforced concrete column 1 in the illustrated example is concrete C.
The main bars 2a, 2a, 2a ... And the stirrups 2b are embedded therein. It is needless to say that the distance between the main bar 2a and the stirrup 2b and the number of used bars may be set appropriately.

The beam-joining metal fitting body 10 has a vertical pipe shape with a quadrangular cross section, and is made of steel or the like as in the conventional case. However, in the present invention, window holes 11 are provided at the four corners, respectively. A cross-shaped reinforcing middle plate 12 is provided to connect the inner surfaces of a pair of vertical surfaces 13 and 13 which are respectively opposed to each other at the upper part and the lower part in the beam joint fitting body 10.

That is, although the beam-joining metal fitting body 10 is surrounded by vertical surfaces 13 on all four sides, it has window holes 11 at its corners, through which concrete to be placed can pass. Further, the reinforcing middle plate 12 is also not vertically connected and is divided at intervals in the vertical direction so that the concrete C can pass therethrough so as not to impair the filling property of the concrete, and the window hole 11 and The integrity of the concrete C is secured by connecting the filled concrete in the upper and lower intermediate voids of the reinforced middle plate 12. Needless to say, a steel plate is also used as the reinforcing middle plate 12. Also,
The beam joining metal fitting body 10 may be manufactured by cutting a pipe-shaped shaped steel into a predetermined length. However, since it is complicated to open the window hole 11 in the shaped steel, flat steel plates are sequentially welded to each other. It is efficient to manufacture it.

On the outer surface of the vertical surface 13 of the main body 10 of the beam joint fitting, the web portion 21 having the stirrup insertion hole 23 is left vertically in the main reinforcement insertion hole 2 with some margins left and right.
Both flange portions 22 having the number 4 are welded to one end surface of the steel beam joint material 20 made of H-shaped steel and positioned in the horizontal direction.

The above-mentioned steel frame beam joint material 20 is a conventionally known one, and prepared by cutting an H-shaped steel into a predetermined length in advance,
It is needless to say that one end may be welded to the beam-jointing metal fitting body 10 and a steel beam (not shown) may be welded or screwed or riveted to the other end, and the construction of the reinforced concrete column 1 is not preceded. At this time, the steel-beam connecting material 20 may be omitted and the end of the steel-frame beam made of H-shaped steel may be directly welded to the vertical surface 13. Steel beam joint material 20 on surface 13
However, it is also the same as in the prior art that the steel-frame beam joint material 20 may be arranged at a desired location on the vertical surfaces 13 of 1 to 4 depending on the construction location.

The beam-joining metal fitting body 10 is embedded in the reinforced concrete column 1 with the other end of the steel-frame beam-joining material 20 protruding.

When burying the beam-jointing metal fitting body 10 in the reinforced concrete column 1, the stir bar 2 is inserted into the stir bar insertion hole 23.
b is laid through the main reinforcement 2a through the main reinforcement insertion hole 24, the periphery thereof is surrounded by a mold (not shown), and concrete C is placed in the mold to form the reinforced concrete column 1. In the figure, every other stirrup 2b is inserted through the stirrup insertion hole 23, but it goes without saying that the stirrup 2b may be inserted through all the stirrup insertion holes 23. It goes without saying that those that do not pass through may be laid out independently of the main muscle insertion hole 24.

[0018]

According to the present invention as described above, the force applied from the steel beam to the beam-joining metal fitting body 10 and the concrete C is
It is possible to provide a joint between a reinforced concrete column and a steel beam that has a large structural resistance by receiving all of compressive force, tensile force and shear force in a wide area of concrete.

Particularly, according to the present invention, the stirrup 2 is formed in the stirrup insertion hole 23.
Since b is arranged through the main bar insertion hole 24 through the main bar 2a, the reinforcing bar and the beam-joining metal fitting body 10 are integrated, and the concrete C is constrained by being surrounded by the main bar 2a and the band bar 2b.
Since the beam-joining metal fitting body 10 is located inside, the force from the steel beam is directly transmitted to the concrete C portion restrained by the main bar 2a and the stirrup 2b, and the strength between the reinforced concrete column and the steel beam is great. The one that can provide the mouth.

Further, according to the present invention, by using the reinforcing middle plate 12, the reinforcing middle plate 12 is used for the reinforced concrete column 1.
Against the external force that inflates the reinforced middle plate 12, the entire cross-shaped surface of the reinforcing middle plate 12 is further resisted.
The force is transmitted to the vertical surface 13 which is joined to the vertical surface 13 which is joined to the vertical surface 13 and the opposing vertical surface also resists external force, so that the joint between the reinforced concrete column and the steel beam having sufficient strength is provided. What can be provided.

Further, the present invention provides the window hole 11 and
Since the reinforcing middle plate 12 is provided with a space between the upper and lower parts, it is possible to minimize impairing the filling property and integrity of the concrete, and by embedding the beam-joining metal fitting body 10, the reinforced concrete column 1 It is possible to provide a joint between a reinforced concrete column and a steel frame beam, which is free from the fear of local deterioration in strength.

[Brief description of drawings]

FIG. 1 is a perspective view of a beam-joining metal fitting body used for a connection between a reinforced concrete column of the present invention and a steel frame beam.

FIG. 2 is a front view of a main portion of a connection between a reinforced concrete column of the present invention and a steel frame beam.

FIG. 3 is a cross-sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforced concrete column 2a Main reinforcement 2b Belt reinforcement 10 Beam-jointing metal fitting body 11 Window hole 12 Reinforcing middle plate 13 Vertical surface 20 Steel-beam joint material 21 Web part 22 Flange part 23 Band reinforcement insertion hole 23 Band reinforcement insertion hole 24 Main reinforcement insertion hole

Claims (1)

[Claims] 1. A window pipe (11) is provided at each of four corners of a beam-joining metal fitting body (10) of a vertical pipe shape having a quadrangular cross-section, and the window holes (11) are respectively provided at an upper portion and a lower portion in the beam-joining metal fitting body (10). A cross-shaped reinforcing middle plate (12) for connecting the inner surfaces of the pair of vertical surfaces (13, 13) is provided, and the outer surface of the vertical surface (13) of the beam joining metal fitting body (10) has some vertical parts. Leaving the margin of the streak insertion hole (2
One end face of the steel beam joint material (20) made of H-shaped steel in which the web portion (21) having 3) is positioned in the vertical direction and both flange portions (22) having the main reinforcement insertion holes (24) are positioned in the horizontal direction. A joint between a reinforced concrete column and a steel beam, in which the above-mentioned beam joint fitting main body (10) is embedded in the reinforced concrete column (1) by projecting the other end side of the steel beam joint material (20).