JPH0738485Y2 - Joint structure between reinforced concrete column and steel beam - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a joint structure between a reinforced concrete column and a steel beam.

[Prior Art] Conventionally, as a column-beam joint structure in which a beam-joint portion of a reinforced concrete column is provided with an intersecting portion of a steel beam integrated in a crossing state, it has been described in JP-A-61-237737. Things are known.

[Problems to be Solved by the Invention] However, in the above technique, since the beam joints are divided into zones due to the presence of the web of the steel beam arranged in the beam joints, the beam joints have shear resistance and There is a drawback in that the reinforcing bars that contribute to the improvement of the restraint force cannot be laid out, so that the strength of the beam joint, which requires the highest strength in the reinforced concrete column, decreases.

As a means for solving the above drawbacks, for example, as a stirrup,
The rebar is processed into an L shape (when the beams are joined in a cross shape) or a U shape (when the beams are joined in one direction), and the L
After fixing the U-shaped or U-shaped rebar to the web of the steel beam, or forming a through hole in the web of the steel beam and inserting the rebar into the through hole, processing the rebar into a hoop shape or a spiral shape. Although such a structure is conceivable, in these cases, there is a drawback that workability of the reinforcing bar and arranging the beam joint is complicated and the workability is low.

[Object of the Invention] Therefore, an object of the present invention is to provide a joint structure between a reinforced concrete column and a steel beam, in which a reinforcing bar for increasing the strength of the beam joint can be easily arranged in the beam joint of the reinforced concrete column. To provide.

[Means for Solving the Problems] The inventors of the present invention have arrived at the present invention as a result of extensive studies to achieve the above object.

That is, the joint structure between the reinforced concrete column and the steel beam according to the present invention is a column-beam joint structure in which the intersection of the steel beams integrated in an intersecting state is arranged in the column head which is the beam joint, A stiffener is attached to the beam end so as to be embedded in a substantially flush state with the concrete surface of the column, and the main bar of the column is each of the beam joints divided by the steel beam web at the intersection. It is characterized in that each zone is restrained by a stirrup.

[Operation] By restraining the column main bar passing through the beam joint for each zone of the beam joint divided by the web at the intersection of the steel beams arranged in the column head, the conventional L-shaped or Reinforcement structure in which reinforcing bars processed into a letter shape are fixed to the steel beam web,
Compared with the reinforcement structure in which the stirrups are inserted through the through holes formed in the steel beam web, the reinforcement work becomes extremely easy.

The concrete of the beam joint is restrained from the inside by the above-mentioned column main bar and the stirrup in each zone, and from the outside, the beam end part is embedded so as to be approximately flush with the concrete surface of the column. Since the zones are integrally connected by the stiffener attached to the flange and the flange and the web of the steel beam at the intersection, the strength of the beam joint is high.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway horizontal sectional view showing an embodiment of a joint structure between a reinforced concrete column and a steel beam according to the present invention, and FIG. 2 is a vertical sectional view thereof.

In the drawing, 1 is a cast-in-place reinforced concrete column or precast reinforced concrete column, 2 is a column main bar, and 3 is concrete. In addition, the column main bars 2 other than the beam joints
The restraint by the stirrup is restrained by a known stirrup structure, specifically, a substantially square stirrup in the case of the quadrangular prism as in this embodiment (not shown).

An intersection portion 5 of the steel beam 4 integrated in an intersecting state is arranged at a head portion which is a beam joint portion of the pillar 1. The steel beam 4
Is an H-shaped steel (including I-shaped steel) having a web 6 and a flange 7.
It is formed in a cross shape as shown by integrally molding or welding a plurality of H-shaped steels.

Due to the existence of the cross-shaped intersection 5, the beam joint of one pillar is divided into four zones A, B, C and D as shown in the figure. The restraint of the column main bar 2 passing through the beam joint is performed in each zone A, B,
For each of C and D, it is carried out by a substantially triangular stirrup 8. Each zone A, B, C, D
By restraining the column main bar 2 by the stirrup bar 8 for each, the conventional L-shaped or U-shaped rebar is fixed to the web 6, or a through hole is formed in the web 6, and the stirrup bar is formed in the through hole. It is extremely easy to work the bar as compared with the one having a bar arranging structure. Moreover, although the reinforcement is easy, it is possible to obtain the same strength at the beam joint as that of the conventional reinforcement structure. In addition, when a part 8A of the stirrup 8 is hidden by the flange 7 when the beam joint is viewed in plan (see FIG. 1),
In addition, it is preferable that it is hidden by the stiffener 9 described later when viewed from the side (see FIG. 2) in terms of the concrete 3 binding force in each zone A, B, C, D. Further, the shape of the stirrup 8 is not limited to a substantially triangular shape, but may be a substantially quadrangular shape, and the flange 7 of the intersecting portion 5 may be formed in a tapered shape in order to enhance the filling property of the concrete 3 (first (See Figures 3 and 4).

Reference numeral 9 denotes a stiffener attached to the end of the beam 4 so as to be embedded substantially flush with the concrete surface of the pillar 1, and the stiffener 9 has the upper and lower parts on the web 6 and one side end on the side. It is fixed to the flange 7 by welding or the like. The stiffener 9 is not only for preventing the buckling of the beam 4 at the beam joint, but is restrained from the inside by the column main bar 2 and the stirrup 8 for each zone A, B, C, D respectively. The concrete 3 together with the web 6 and the flange 7 at the intersection 5 are restrained from the outside so that the concrete 3 in each zone A, B, C, D is integrally connected.

The embodiment of the present invention has been described above based on the structure in which the four beams 4 are joined to the pillar 1 so as to cross each other in a cross shape.
The present invention is not limited to this. For example, when three beams are joined in a T-shape to a pillar positioned so as to contact an outer wall,
That is, when the beam joint is divided into three zones (see FIG. 4), or when two beams are joined to the pillar located at the corner in an L-shape, that is, the beam joint Can be applied to column-beam joints having various configurations, such as when the is divided into two zones (not shown). Incidentally, FIG. 4 shows that when the shape of the stirrup 8 is a substantially triangular shape and a substantially quadrangular shape,
Further, various aspects such as the case where the flange 7 is formed in a tapered shape are also shown.

[Advantage of Invention] According to the present invention, the restraint of the column main bar located at the beam joint is
By carrying out for each zone of the beam joint divided by the web at the intersection of the steel beams arranged on the column head, a band reinforcement for increasing the strength of the beam joint is provided in the beam joint of the reinforced concrete column. It is possible to provide a joint structure between a reinforced concrete column and a steel beam that can be easily reinforced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway transverse sectional view showing an embodiment of a joint structure between a reinforced concrete column and a steel beam according to the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. FIG. 4 is a transverse sectional view showing another embodiment of the present invention. 1: Column 2: Column main reinforcement 3: Concrete 4: Steel beam 5: Intersection 6: Web 7: Flange 8: Strip reinforcement 9: Stiffener A, B, C, D: Zone

Claims (1)

[Scope of utility model registration request] 1. In a column-beam joint structure in which a column head, which is a beam joint, is provided with an intersection of steel beams integrated in an intersecting state, a stiffener is provided at the beam end, and a concrete surface of the column is provided. It is mounted so as to be embedded in a substantially flush state with respect to the main pillar, and the column main bar is restrained by a band bar in each zone of the beam joint section divided by the steel beam web at the intersection. Of reinforced concrete columns and steel beams.