JPH0673784A - Jointing structure of steel framed reinforced concrete column and steel skeleton beam - Google Patents

Abstract

PURPOSE:To facilitate construction work, by providing steel skeleton columns, a plurality of reinforcing rods extending along the steel skeleton column 4, steel pipe joints, concrete filled in the steel pipe joint, steel skeleton beams, and concrete covering the steel column. CONSTITUTION:A plurality of main reinforcing rods 2 are arranged along a steel skeleton column 1 with a H-shaped lateral section vertically extended and steel skeleton beams 3 are fixed by welding at the sides. A steel pipe joints 4 provided with ribs 5 in the inside wall is equipped around the steel column and the steel reinforcing rods 2. Next, a plurality of steel hoops are horizontally applied over a plurality of steel rods 2 and molding frames are set at the position shown by dotted lines and then concrete is placed. The adhesion of the steel pipe 4 with the concrete is made stronger by the ribs 5 to form a jointed structure of the steel framed reinforced concrete column and the steel beam 3. In this way, the reinforcing rods 2 can be freely arranged by fixing the beam 3 at the side of steel pipe 4 and concrete is securely filled inside the steel framed reinforced concrete column to facilitate the construction.

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 a steel-framed reinforced concrete column and a steel frame beam used in buildings and the like.

[0002]

2. Description of the Related Art In the construction of buildings and the like, a mixed structure in which steel-framed reinforced concrete columns and steel-framed beams are joined is sometimes used. The reason for this is that this reinforced concrete column has the advantage of being more earthquake-resistant than concrete columns or reinforced concrete columns because it has reinforcing bars and column steel frames that are rich in toughness. Further, since the steel frame beam is lighter than the reinforced concrete beam and does not require reinforcement bar arrangement, it has an advantage that a long span frame structure is possible and the workability thereof is good.

FIG. 3 (a) is a side view showing a joint between a conventional steel-framed reinforced concrete column and a steel-framed beam in a longitudinal section.
3B is a sectional view taken along the line AA of FIG. 3A, and FIG. 4 is a sectional view taken along the line DD of FIG. 3A. As shown in FIG. 3, this steel-framed reinforced concrete column 30 has a cross-shaped cross section, and a cross-shaped steel frame 31 having a flange 31a at its end, and four main reinforcing bars 32 extending along the cross-shaped steel frame 31. , And the band reinforcing bar 33 wound around the four main reinforcing bars 32. Further, as shown in FIG. 4, in the steel frame beam 35, the H-shaped steel is arranged with the flange 38 thereof horizontal and the beam reinforcing bar 39 extending in parallel with the H-shaped steel is provided with a stirrup reinforcing bar 36 at a portion near the steel frame reinforced concrete column 30.
Is wound. The ribs 36 are wound in order to make a portion of the steel beam 35 near the steel reinforced concrete column 30 into a steel reinforced concrete member so that the force can be exchanged smoothly between the steel reinforced concrete column 30 and the steel beam 35. The H-section steel is exposed except in the vicinity of both ends of the steel beam 35. At the joint between the steel reinforced concrete column 32 and the steel beam 35, two stiffeners 34 are provided to prevent local deformation around the joint.
Is fixed to the end surface of the flange 38 of H-shaped steel via the flange 31a of the cross steel frame 31 and is also fixed to the side surface of the cross steel frame 31. The stiffener 34 has a hole 34a in the center thereof. The outer periphery of the steel-framed reinforced concrete column 30 and the part of the beam-reinforced bar 39 around which the ribs 36 are wound in the vicinity of the steel-framed reinforced concrete column 30 is covered by a form 37.

In this state, concrete (not shown) is applied to the form 3 from the top of the steel frame reinforced concrete column 30 (not shown).
It is placed inside 7. This cast concrete is used in the gap between the stiffener 34 and the form 37 and the stiffener 34.
Steel reinforced concrete columns 30 and beam reinforcements 3 near the steel reinforced concrete columns 30 through the holes 34a of the
The portion of the steel beam 35 around which the loose reinforcing bar 36 is wound is filled.

[0005]

SUMMARY OF THE INVENTION In the above conventional technique,
At the joint between the steel-framed reinforced concrete column 30 and the steel-framed beam 35, the H-shaped steel of the steel-framed beam 35 becomes an obstacle, and there is a problem that the main reinforcing bars 32 of the steel-framed reinforced concrete column 30 cannot be freely arranged. In addition, since the stiffener 34 is provided at the joint portion to prevent its local deformation, the stiffener 34 impedes the flow of concrete, and it is difficult to pour concrete into the steel reinforced concrete columns 30 and sufficiently fill it. There is also the problem that Further, the H-shaped steel of the steel beam 35 and the steel reinforced concrete column 30
The cross steel frame 31 is firmly joined by welding or the like,
The concrete of the steel beam 35 and the steel reinforced concrete column 30 is joined by the bearing force and adhesive force of this concrete. Therefore, when the force is transmitted from the steel beam 35 to the steel reinforced concrete column 30, this force is not evenly transmitted to the cross steel frame 31 of the steel reinforced concrete column 30 and the concrete. Sum of proof stress against moment, s
When BMA is the sum of bending strength of steel beams, scMA /
The condition sBMA ≧ 0.4 (Architectural Institute of Japan: Steel-framed reinforced concrete column structure design and construction guide, page 19, formula 77) is imposed, and there is also a problem that the degree of freedom in design is insufficient to satisfy this condition. .

In view of the above circumstances, the present invention allows the main rebars to be laid out freely, the concrete can be surely filled into the inside of the steel-framed reinforced concrete columns, and the degree of freedom in design can be increased. The purpose of the present invention is to provide a joint structure between a steel reinforced concrete column and a steel beam.

[0007]

[Means for Solving the Problems] A joint structure of a steel reinforced concrete column and a steel beam of the present invention for achieving the above object is a column steel frame, and a plurality of reinforcing bars extending along the column steel frame,
A joint steel pipe that is installed around a pillar steel frame and a plurality of rebars, a concrete that is filled inside the joint steel pipe and fixes the joint steel pipe and the pillar steel frame and a plurality of rebars, and a joint steel pipe along the pillar steel frame It is characterized by comprising a steel beam fixed to the extending side surface and a concrete that is continuous with the concrete and covers the column steel frame and a plurality of reinforcing bars.

[0008]

The joint structure of the steel reinforced concrete column and the steel beam of the present invention comprises the joint steel pipe fixed to the concrete of the steel reinforced concrete column, and the joint beam is provided on the side surface of the joint steel pipe. Since there is no steel beam inside, therefore the main reinforcing bars can be freely arranged, and there is no need for a stiffener to prevent local deformation of the joint.
Concrete is reliably filled inside the steel reinforced concrete columns.

Further, according to the present invention, since the joined steel pipe and the steel beam are joined and the steel frame of the steel reinforced concrete column and the steel beam are not directly joined, the force from the steel beam is the column steel frame of the steel reinforced concrete column and the concrete. Is smoothly transmitted to both of the above, and thus the above-mentioned scMA / sBMA ≧
There is no restriction of 0.4, and there is freedom in design.

By the way, conventionally, a reinforced concrete column and a steel frame beam have been joined together. FIG. 5 is a perspective view of a joint portion between a reinforced concrete column and a steel frame beam disclosed in JP-A-2-95702. 4 as shown in FIG.
A joint steel pipe 27 is provided at a joint portion between a reinforced concrete column 25 and a steel beam 28 through which a plurality of or more reinforcing bars 26 pass. Inside the joined steel pipe 27, concrete that is continuous with the concrete of the reinforced concrete column 25 is cast to integrate the reinforced concrete column 25 and the joined steel pipe 27, and the side surface of the joined joined steel pipe 27 is
The steel beams 28 of the book are joined by welding or the like.

The joint between the reinforced concrete column 25 and the steel beam 28 shown in FIG. 5 may be perceived to be similar to the present invention at first glance. However, the joint shown in FIG. 5 cannot join the steel frame beam 28 to the column steel frame because the column steel frame is not provided in the reinforced concrete column 25, and therefore the joining steel pipe 27 is inevitably provided with the reinforced concrete column 25. The steel frame beams 28 are joined together. On the other hand, in the case of steel frame reinforced concrete columns, since there is a column steel frame, it is common knowledge to join the column steel frame and the steel beam, and the column steel frame and the steel beam are directly connected. A structure without joining was not considered. The present invention overcomes the idea of this point, and in a joint structure of a steel-framed reinforced concrete column and a steel beam, a joined steel pipe is provided so as not to directly join the column steel frame and the steel beam.

[0012]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a perspective view of a joint portion between a steel-framed reinforced concrete column and a steel frame beam according to an example of the present invention. This joint portion is vertically mounted and has a cross section of an H-shaped column steel frame 1, a plurality of main reinforcing bars 2 extending along the column steel frame 1, the column steel frame 1 and the main reinforcing bars 2, and the inner wall thereof It has a joined steel pipe 4 provided with ribs 5 on the side and four steel frame beams 3 fixed to the side surface of the joined steel pipe 4 by welding or the like.

In this state, a plurality of strip reinforcing bars (not shown) are horizontally wound around the plurality of main reinforcing bars 2 of the steel frame reinforced concrete column, and a form (not shown) is formed at a portion indicated by a dotted line in FIG. ) Is installed, concrete (not shown) is placed inside the mold to form a joint structure of the steel-framed reinforced concrete column and the steel-framed beam 3. Further, since the steel beam 3 is fixed to the side surface of the joined steel pipe 4, there is no pillar steel frame 3 inside the joined steel pipe 4, and therefore the main rebar 2 inside the joined steel pipe 4
A large number of bars can be laid out freely and the rebars can be easily wound.

The ribs 5 provided on the inner wall of the joined steel pipe 4 are for strengthening the adhesion between the joined steel pipe 4 and concrete. FIG. 2 is a plan view showing a cross section of a steel-framed reinforced concrete column in a horizontal direction at a joint portion between a steel-framed reinforced concrete column and another example of the present invention. The joint shown in FIG. 2A includes a column steel frame 11 extending in a direction perpendicular to the paper surface of FIG. 2A, a plurality of main reinforcing bars 2 extending along the column steel frame 11, the column steel frame 11 and the main reinforcing bars. It has a joined steel pipe 14 which is annularly attached to the two, and a steel beam 3 fixed to the side surface of the joined steel pipe 14.

Since the flanges 11a of the column steel frame 11 are concentrated near the corners of the joined steel pipe 4, the joints have excellent strength near the corners. Figure 2
The joint shown in (b) is composed of a column steel frame 21 extending in a direction perpendicular to the paper surface of FIG. 2 (b), a plurality of main reinforcing bars 2 extending along the column steel frame 21, and the column steel frame 21 and the main reinforcing bar 2. It has a joined steel pipe 24 having a circular cross section and is circularly mounted, and a steel beam 3 fixed to the side surface of the joined steel pipe 24.

As shown in FIG. 2 (b), the cross section of the joined steel pipe 24 may be circular, and the pillar steel frame 21 may be circular.

[0017]

As described above, since the joint structure of the steel-framed reinforced concrete column and the steel frame beam of the present invention is configured such that the steel beam is fixed to the side surface of the joined steel pipe, the reinforcing bar can be freely arranged. In addition, concrete is reliably filled inside the steel-framed reinforced concrete columns. Further, since the present invention is configured such that the column steel frame and the steel beam are not directly joined, the force from the steel beam is smoothly transmitted to the concrete of the steel reinforced concrete column, the column steel frame, and the rebar through the joining steel pipe. It Therefore, according to the present invention, since the load bearing ratio of the column steel frame and the steel beam is not limited, the load bearing ratio of the column steel frame and the steel beam can be freely combined.
Further, the present invention is capable of arbitrarily selecting the cross-sectional shape of the column steel frame, omitting the mounting process of a reinforcing material such as a stiffener, and reinforcing the steel beam part near the steel-framed reinforced concrete column with ribs and concrete. Since it can be omitted, the manufacturing cost can be reduced. Further, according to the present invention, the flange of the column steel frame can be positioned in any direction, and the cross-sectional strength can be selected depending on the position in which the flange is positioned.

[Brief description of drawings]

FIG. 1 is a perspective view of a joint portion between a steel-framed reinforced concrete column and a steel-frame beam according to an example of the present invention.

FIG. 2 is a plan view showing a horizontal cross-section of a steel-framed reinforced concrete column of a joint between a steel-framed reinforced concrete column and a steel frame beam in another example of the present invention.

FIG. 3 is a side view showing a joint section between a conventional steel-framed reinforced concrete column and a steel-frame beam in a longitudinal direction, and is a side view (a), A- of (a).
It is an A sectional view (b).

FIG. 4 is a DD cross-sectional view showing a part of FIG.

FIG. 5 is a perspective view of a joint portion between a reinforced concrete column and a steel beam disclosed in JP-A-2-95702.

[Explanation of symbols]

 1 Column steel frame 2 Main rebar 3 Steel beam 4 Joint steel pipe

Claims (1)

[Claims] 1. A column steel frame, a plurality of reinforcing bars extending along the column steel frame, a joint steel pipe annularly mounted on the column steel frame and the plurality of reinforcing rods, and the joint filled inside the joint steel pipe. Concrete for fixing the steel pipe and the pillar steel frame and the plurality of reinforcing bars, a steel beam fixed to a side surface of the jointed steel pipe extending along the pillar steel frame, and the concrete column, which is continuous with the concrete, A structure for joining a steel-framed reinforced concrete column and a steel beam, comprising: