JP2007291803A - Joint structure for column and beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure having a column and beams capable of transmitting its stresses by the whole of the column structure instead of transmitting them only through a steel pipe column. <P>SOLUTION: The joint structure of the column and beams comprises reinforcing steel bars 3 comprising column main bars 5 and column hoops 6; steel beams 2 connected to a steel pipe column 1 filled with concrete 4; cotter members 8 projected to the inner sides of the steel pipe column 1 connected to the steel beams 2; and the cotter members 8 respectively inserted to corresponding recesses 7 formed at the inner sides of the hoops 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint structure between a column and a beam.

In order to join beams without using a diaphragm in the conventional column-beam connection structure, as shown in FIG. 8 (1), the steel pipe column 22 is made thicker (increased) and the concrete is put inside. 23 was filled. In addition, as another column-beam joint structure, for example, the invention of JP-A-2005-220597 is known.
Japanese Patent Laid-Open No. 2005-220597

  However, in the above-mentioned column-beam joint structure, even if the steel pipe column is filled with concrete, the filled concrete hardly contributes to the stress transmission at the beam joint, and the stress state is borne only by the steel pipe. The structural performance of the joint could not be improved. In particular, when the width of the beam to be connected is small, as shown in FIG. 8 (2), it becomes difficult to suppress the out-of-plane deformation of the steel pipe column, and stress concentrates on the beam end. The proof strength of the beams could not be fully demonstrated. In addition, since the stress is transmitted only with the steel pipe column, a considerable amount of steel pipe thickness must be ensured in order to ensure sufficient joint strength and rigidity.

  The present invention has been made in view of these problems, and its purpose is to provide a column-to-beam joint structure that can transmit stress as a whole column, not only by steel pipe columns. is there.

  In order to solve the above problems, the column-beam connection structure is reinforced with reinforcing bars consisting of main bars and hoop bars, and the steel beam is connected to a steel pipe column filled with concrete. A cotter member protrudes from the inner side surface of the steel pipe column, and the cotter member is inserted into a recess formed on the side surface of the hoop line. Moreover, a cotter member contains either the steel plate with a reinforcing bar which provided the reinforcing bar on both surfaces of the steel plate, the steel plate with a rib which provided the rib on both surfaces of the steel plate, or a headed stud.

  Since the stress can be transmitted not only from the steel pipe column but also from the cotter member via the filling concrete and the reinforcing reinforcing bar, the thickness increase of the steel pipe column can be greatly suppressed. Moreover, since the cotter member is provided in the center part of the inner surface of the steel pipe column, the out-of-plane deformation of the steel pipe column due to the beam stress can be suppressed. Further, suppressing the out-of-plane stress of the steel pipe column relaxes the stress concentration at the end of the beam, so that the beam strength can be exhibited more efficiently than the conventional thickened diaphragm.

  Hereinafter, embodiments of the column-beam joint structure of the present invention will be described. In each embodiment, the same components are described with the same reference numerals, and only different components are described with different reference numerals.

  FIGS. 1 to 3 show a structure in which a steel beam 2 is bonded to four sides of a steel pipe column 1 and a beam-to-beam connection structure. A reinforcing bar 3 is arranged in the steel pipe column 1 and concrete 4 is filled. It is configured. The reinforcing reinforcing bar 3 includes a columnar main bar 5 and a hoop bar 6 arranged in the column main bar 5, and a concave part 7 recessed inwardly is formed at the center of the side surface of the hoop bar 6. A cotter member 8 is inserted into the recess 7 to integrate the steel pipe column 1 with the reinforcing steel bars 3 and the concrete 4.

  A concave portion 7 recessed inward is formed at the center of the side surface of the hoop bar 6 and is formed by using four C-shaped reinforcing bars 9 and 10 as shown in FIG. The two C-shaped rebars 9 are arranged with the two C-shaped reinforcing bars 9 in the vertical direction and back to back (with the opening side facing outward) with an appropriate gap. Are arranged back to back (with the opening side facing outward) with an appropriate gap on the lateral side, and the tip portions of the C-shaped reinforcing bars 9 and 10 are joined together to form four recesses 7 and four small hoops 11. A hoop muscle 6 is formed. Although the lap joint is performed in the horizontal direction (left and right) in the drawing, it can of course be performed in the vertical direction.

  When the column main reinforcing bars 5 are inserted into the four small hoops 11, the reinforcing reinforcing bars 3 in which the hoop reinforcing bars 6 are arranged at appropriate intervals are formed in the column main reinforcing bars 5, and the concave portions 7 are formed on the side surfaces of the respective hoop reinforcing bars 6. Is formed. Since the cotter member 8 projecting from the inside of the steel pipe column 1 is inserted into the recess 7, the reinforcing steel bars 3 can be inserted from the upper surface of the steel pipe column 1.

  FIG. 4 (2) shows another hoop bar 12, in which a concave part 7 is formed at the center of the side surface with a single reinforcing bar, and the end part is joined by the same method as described above. And

  As shown in FIG. 5, the cotter member 8 protrudes from the central portion of the inner surface of the steel column 1 to which the steel beam 2 is joined. Each of which is provided with a deformed reinforcing bar 16. The amount of reinforcing bars is determined as appropriate depending on the size of the steel beam 2 to be attached. As a result, the adhesion to the concrete 4 becomes strong, so that the steel column 1, the concrete 4, and the reinforcing reinforcing bar 3 can be integrated.

  In addition to the above, the cotter member 8 may be a ribbed steel plate 17 or a headed stud 18 provided with ribs on both surfaces of a steel plate 15 as shown in FIG. Inserted into.

  7 (1) shows a column-to-beam joint structure 19 in which steel beams 2 are joined in three directions, and FIG. 7 (2) shows a column-to-beam joint structure 20 in which steel beams 2 are joined in two directions. The cotter member 8 is protruded only at a portion where the steel beam 2 is joined, and the cotter member 8 is inserted into the concave portion 7 of the hoop muscle 6.

It is a cross-sectional view of the junction structure of a column and a beam. It is a longitudinal cross-sectional view of the junction structure of a column and a beam. It is a perspective view of the junction structure of a column and a beam. (1) And (2) is a top view of a hoop line. It is a perspective view of a cotter member. (1) And (2) is a perspective view of another cotter member. (1) And (2) is a cross-sectional view of the joint structure of a column and a beam. (1) And (2) is a cross-sectional view of the conventional column-beam junction structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,22 Steel pipe pillar 2 Steel beam 3 Reinforcement reinforcement 4,23 Concrete 5 Column main reinforcement 6,12 Hoop reinforcement 7 Recessed part 8 Cotter member 9, 10 C-shaped reinforcement 11 Small hoop 13 Reinforcement 14 Hoop 15 Steel sheet 16 Deformed reinforcement 17 Steel plate with rib 18 Headed studs 19, 20 Column / beam connection structure

Claims (2)

  Reinforcing bars consisting of main bars and hoop bars are arranged, and a steel beam is connected to a steel pipe column filled with concrete, and a cotter member projects from the inner surface of the steel pipe column to which the steel beam is connected, A joining structure of a column and a beam, wherein the cotter member is inserted into a recess formed on a side surface of the hoop line.   The cotter member is one of a steel plate with reinforcing bars provided with reinforcing bars on both sides of the steel plate, a steel plate with ribs provided with ribs on both sides of the steel plate, and a headed stud. Junction structure.

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