JP3859408B2 - Joint structure of steel pipe concrete column and reinforced concrete beam - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure between a steel pipe concrete column and a reinforced concrete beam.
[0002]
[Prior art]
Conventionally, the joint structure of a steel pipe concrete column and a reinforced concrete beam is as shown in FIGS. In FIG. 4, horizontal stiffeners 17 and 18 are provided on the entire outer surface of the upper end of the steel pipe concrete column 15 on the lower floor and the lower end of the steel pipe concrete column 16 on the upper floor, and the upper and lower horizontal stiffeners 17 and 18 are attached to the anchor bolt 19. The steel pipe concrete columns 15 and 16 and the reinforced concrete beam 20 are integrally joined. Further, FIG. 5 shows that the inner surfaces of the steel pipe concrete columns 15 and 16 on the lower floor and the upper floor are roughened, and the joint bars 21 are passed through the reinforced concrete beams 20 and extend over the steel pipe concrete columns 15 and 16 on the lower floor and the upper floor. It is a bar arrangement.
[0003]
[Problems to be solved by the invention]
However, the joint structure shown in FIG. 4 has a problem that bolts and nuts come out on the upper and lower surfaces of the beam, and anchor bolts are loosened so that force is not transmitted smoothly. The joint structure shown in FIG. 5 is difficult to roughen the inner surface of the steel pipe and requires a support for setting the main reinforcing bar of the reinforced concrete beam.
[0004]
The present invention has been made in view of such problems, and the purpose of the present invention is to provide steel pipe concrete in which the force of the beam and the column can be smoothly transmitted and the main reinforcing bar of the reinforced concrete beam can be set without requiring support. It is to provide a joint structure between columns and reinforced concrete beams.
[0005]
[Means for Solving the Problems]
The joint structure of a steel pipe concrete column and a reinforced concrete beam to solve the above problems is between the upper end of the steel pipe concrete column on the lower floor and the lower end of the steel pipe concrete column on the upper floor erected on it. Reinforced concrete beams are arranged, and ribs projecting inward are provided at the upper end of the lower steel pipe concrete column and the lower end of the upper steel pipe concrete column, respectively, and the joint bar penetrates the reinforced concrete beam to the lower floor. The steel pipe concrete column and the steel pipe concrete column on the upper floor are arranged. In addition, the ribs include appropriately sized ribs provided at appropriate intervals. Moreover, it is included that the rib was provided in the inner periphery of the steel pipe of the steel pipe concrete pillar. In addition, the joining bars include those arranged through the ribs or arranged between the ribs.
[0006]
The force of the joint reinforcement is transmitted to the steel pipe of the steel pipe concrete column through the concrete, and is also transmitted to the steel pipe of the steel pipe concrete column through the rib. Therefore, the length of the joining bars can be further shortened by providing the ribs. Moreover, a rib can be provided according to the number of joining bars. Moreover, the force is smoothly transmitted from the rib to the steel pipe of the steel pipe concrete column. Moreover, the force is smoothly transmitted from the joining bar to the steel pipe of the steel pipe concrete column.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a joint structure of a steel pipe concrete column (hereinafter referred to as a steel tube column) and a reinforced concrete beam (hereinafter referred to as a beam) according to the present invention will be described with reference to the drawings. (1) of FIG. 1 is sectional drawing of the junction structure of the steel pipe pillar and beam of 1st Embodiment, (2) is the sectional view on the AA line of (1).
[0016]
The steel pipe pillar-to-beam joint structure 1 is such that a beam 3 is placed on the upper end surface of a steel pipe pillar (hereinafter referred to as a lower floor pillar) 2 on a lower floor, and a steel pipe pillar on an upper floor (hereinafter referred to as an upper floor pillar). 4) is erected, and a beam 3 is installed between the lower column 2 and the upper column 4. The joint structure 1 is optimally used for a structure such as a warehouse having a floor height of 6 m or more.
[0017]
The steel pipes 5 of the lower floor pillar 2 and the upper floor pillar 4 are filled with concrete 6, the upper end surface of the lower floor pillar 2 is brought into contact with the lower bar 7 of the beam 3, and the lower end surface of the upper floor pillar 4 is the beam 3. The lower floor pillar 2, the upper floor pillar 4, and the beam 3 are integrally joined. As described above, the upper end of the lower floor column 2 is brought into contact with the lower end bar 7 of the beam 3 so that the lower end bar 7 can be arranged without a support. Further, a joint bar 9 that penetrates the beam 3 is arranged over the lower floor pillar 2 and the upper floor pillar 4. Therefore, the load on the upper floor is smoothly transmitted from the concrete 6 to the steel pipe 5 through the joint bars 9.
[0018]
FIG. 2 shows a steel pipe column / beam joint structure 10 according to the second embodiment. A rib 11 is provided on the entire inner surface of the steel pipe 5 of the lower column 2 and the upper column 4, and the rib 11 penetrates the rib 11. The connecting bars 9 are arranged, and the other points are the same as those of the steel pipe column / beam connecting portion structure 1 of the first embodiment. As described above, the joining bar 9 penetrates the rib 11 and is arranged over the lower floor column 2 and the upper floor column 4, so that the load on the upper floor is smoothly transmitted from the concrete 6 to the steel pipe 5 through the joining bar 9. In addition, it is transmitted from the rib 11 to the steel pipe 5 through the joint bar 9.
[0019]
FIG. 3 shows another embodiment of the rib 11. In (1), an appropriately sized rib 12 is provided on the inner surface of the steel pipe 5 at appropriate intervals, and the joining bars 9 are arranged on the rib 12. As shown in FIG. It is a streak. This has the advantage that the ribs 12 can be provided according to the number of joining bars 9. In (2), similarly to (1), ribs 12 of an appropriate size are provided on the inner surface of the steel pipe 5 at appropriate intervals, and joining bars 9 are arranged between the ribs 12. Similarly to the above, the load on the upper floor is smoothly transmitted from the concrete 6 to the steel pipe 5 through the joint bar 9 and also transmitted from the rib 12 to the steel pipe 5 through the joint bar 9. Further, (3) is one in which the joining bars 9 are arranged inside the ribs 13 provided on the entire inner surface of the steel pipe 5, and the same effects as in the above (1) and (2) can be achieved.
[0020]
【The invention's effect】
Since it can arrange only by installing the lower end of a beam in the upper end surface of a lower floor pillar, it can be set as the junction structure which does not need the support for arranging the lower end. In addition, the shearing force from the beam is smoothly transmitted to the concrete of the steel tube column, and the bending moment is also smoothly transmitted to the concrete of the steel tube column by lengthening the joint.
[0021]
The force of the joint reinforcement is transmitted to the steel pipe of the steel pipe column through the concrete, and is also transmitted to the steel pipe of the steel pipe concrete column through the rib. Therefore, the length of the joining bars can be further shortened by providing the ribs.
[0022]
Ribs can be provided according to the number of joining bars.
[0023]
The force is smoothly transmitted from the rib to the steel pipe of the steel pipe concrete column.
[0024]
The force is smoothly transmitted from the joint bar to the steel pipe of the steel pipe concrete column.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a joint structure between a steel pipe column and a beam according to a first embodiment, and (2) is a cross-sectional view taken along line AA of (1).
FIGS. 2A and 2B are cross-sectional views of a joint structure between a steel pipe column and a beam according to a second embodiment, and FIGS. 2A and 2B are cross-sectional views taken along line AA in FIG.
FIGS. 3A to 3C are plan views showing other embodiments of ribs. FIGS.
4A is a cross-sectional view of a conventional joint structure between a steel pipe column and a beam, and FIG. 4B is a cross-sectional view taken along line CC of FIG.
5A is a cross-sectional view of a conventional joint structure between a steel pipe column and a beam, and FIG. 5B is a cross-sectional view taken along the line DD of FIG.
[Explanation of symbols]
1, 10 Steel pipe column and beam joint structure 2, 15 Lower floor column 3, 20 Beam 4, 16 Upper floor column 5 Steel pipe 6 Concrete 7 Bottom bar 8 Upper bar 9, 21 Joint bar 11, 12, 13 Rib 17, 18 Horizontal stiffener

Claims (4)

  A reinforced concrete beam is disposed between the upper end of the steel pipe concrete pillar on the lower floor and the lower end of the steel pipe concrete pillar on the upper floor, and the upper end of the steel pipe concrete pillar on the lower floor, A rib projecting inward is provided at the lower end of the steel pipe concrete column, and the joining bars penetrate the reinforced concrete beam and are arranged over the steel pipe concrete column on the lower floor and the steel pipe concrete column on the upper floor. Structure of steel pipe concrete column and reinforced concrete beam. The joint structure of a steel pipe concrete column and a reinforced concrete beam according to claim 1 , wherein ribs having appropriate sizes are provided at appropriate intervals. The joint structure of a steel pipe concrete column and a reinforced concrete beam according to claim 1 , wherein the rib is provided on the entire inner circumference of the steel pipe of the steel pipe concrete column. The joining structure of a steel pipe concrete column and a reinforced concrete beam according to claim 2 or 3 , wherein the joining bars are arranged through the ribs, or between the ribs.

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