JPH07259256A - Method of anchoring column main reinforcement upper end part on the uppermost floor - Google Patents

Abstract

PURPOSE:To effectively improve the deformation bearing force and reliability of an RC column head part at a joint part between an RC column and a steel beam on the uppermost floor by anchoring plural anchor metal members to the upper end parts of column main reinforcements on both sides of a steel beam at a joint part between the RC column and the steel beam. CONSTITUTION:At a joint part 4 between a steel beam 3 and the upper part of an RC column 1 on the uppermost floor of a building, at least two anchor metal members 5 are disposed on the upper side of the steel beam 3 disposed at the upper part of the RC column 1, with a mutual space and in the state of intersecting the steel beam 3. Both anchor metal members 5 are connected being anchored to the upper end parts 2a of column main reinforcements 2 on both sides of the steel beam 3.

Description

Detailed Description of the Invention

0001,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing an upper end of a column main bar at a column head of a RC column-steel beam joint on the uppermost floor of a building.

[0002]

2. Description of the Related Art Conventionally, at the joint between the upper part of the RC column and the steel beam on the top floor of a building, the upper end of the column main bar is fixed at the column head as shown in FIG. 3 (A). Structure) a, the upper end of the column main bar b is formed into a U-shaped hook b1, or, as shown in FIG. 3B, an inverted U-shaped anchor bar d is formed between the upper ends of the column main bar b.
Or a coupler (not shown)
Generally, a method of connecting and fixing by the method is used.

[0003]

Conventionally, at the joint between the RC column and the steel beam on the top floor of the building, the upper end of the column main bar forms a hook as described above, and is fixed,
Since an inverted U-shaped anchor bar is connected and fixed between the upper ends, neither of them can secure sufficient anchoring force at the upper end of the column main bar, and its RC stigma at the time of a large horizontal load (such as an earthquake) There are problems such as difficulty in deforming parts.

The present invention was developed in order to address the above-mentioned problems, and the object of the invention is R
At least 2 above the C-column / steel beam joint
By arranging a number of anchor metal fittings at intervals and crossing each other and fixing them at the upper end of the column main bar, the deformation capacity and reliability of the RC column head at the joint between the RC column and the steel beam on the top floor were improved. It is to provide a method of fixing the upper end of the pillar main bar on the top floor.

[0005]

According to the present invention, at the joint between the upper part of the RC column and the steel beam on the top floor of the building, R
At least two anchor metal fittings are arranged on the upper side of the steel beam placed on the upper part of the C column with a space between them and are arranged in a cross shape with respect to the steel beam. By fixing and connecting to each section,
The anchor hardware effectively enhances the strength, deformation capacity, and reliability of the RC column head at the joint between the RC column and the steel beam on the top floor.

[0006]

[Operation] At the joint between the RC column and the steel beam on the uppermost floor, at least two anchor metal pieces are arranged in a cross shape and at an interval above the steel beam arranged above the RC column, and each anchor is arranged. Fixing and connecting the hardware to the upper end of each column main bar arranged on both sides of the steel beam for easy construction. At the joint between the RC column and the steel beam, the anchor hardware is arranged with a space between them. It has excellent anchor performance and anchoring performance of the upper end of the column main bar, and the stress transmitted from the steel beam at the time of deformation load is transmitted to each anchor metal and the column main bar and is effectively shared by both tensile forces, and RC stigma The strength of the section is remarkably increased, and the structure becomes deformed integrally with the steel beam. The deformability of the RC column head at the joint is drastically increased, and stable deformability is obtained even under a large horizontal load.

[0007]

1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment. In FIG. 1, 1 is an RC column (reinforced concrete column), 2 is a column main bar, and 3 is the RC on the top floor of the building.
Steel beams 4 arranged on top of the pillar 1 are R on the top floor
The joints 5 between the upper portion of the C column 1 and the steel beam 3 are arranged on the upper side of the steel beam 3 and anchored to the upper ends 2a of the column main bars 2 on both sides thereof, 6 is the anchor metal 5 and the column main bar 2 The first embodiment shown in FIG. 1 is a nut that is fixed to the upper end portion 2a of the RC pillar 1. At the joint portion 4 between the upper portion of the RC column 1 and the steel beam 3 on the uppermost floor of the building, At least two anchor metal pieces 5 are arranged on the upper side of the beam 3 with a space therebetween and in a cross shape, and both anchor metal pieces 5 are fixed and connected to the upper end portions 2a of the column main bars 2 on both sides of the steel beam 2, respectively. It is a method of fixing the upper end of the pillar main bar on the top floor.

More specifically, the above anchor metal 5
Are formed of flat steel or channel steel (not shown) as shown in FIG. 1 and are arranged in a cross shape over the upper side of the steel beam 3, and are arranged on both sides of the steel beam 2. Book (4 in the example shown)
This is a structure in which a plurality of insertion holes (not shown) that are fixed to the upper end portion 2a of the column main bar 2 of (book) are arranged.

RC on the top floor of the building as shown
At the joint 4 between the column 1 and the steel beam 3, two anchor metal pieces 5 are arranged above the steel beam 3 at the upper part of the RC column 1 at appropriate intervals and in a cross shape, and each anchor After inserting the upper end portions 2a (with screws) of the column main bars 2 arranged on both sides of the steel beam 3 into the insertion holes of the hardware 5 and fastening and fixing with the nut 6, the RC columns 1 are connected. When concrete is cast, at the RC column / steel beam joint portion 4, both anchor metal pieces 5 are arranged at appropriate intervals with respect to each other on the upper side of the steel beam 3 and are arranged in a cross shape so that a plurality of anchor metal pieces 5 on both sides of the steel beam 3 are formed. It is fixed to each column main bar 2 of the book, and by forming it with a proper small width and arranging it at intervals, the adhesive force with concrete, that is, the anchor performance is effectively enhanced, and, for example, by the horizontal force during an earthquake. Large stress concentration occurs at the joint 4 of RC column and steel frame beam. In this case, as shown in FIG. 1B, the horizontal component and the vertical component of the upward diagonal stress P transmitted from the steel beam 3 are transmitted to the anchor metal 5 and the column main bar 2, and the tensile forces H and T are applied. Effectively shared, RC pillar 1
The strength of the head of the RC is significantly increased, and the structure becomes deformed by being integrally connected with the steel beam 3, and the RC column-steel beam joint 4
The deformation capacity of the upper part of the RC column 1 is drastically increased, and stable deformation performance can be obtained even under the large horizontal load as described above.

In the second embodiment shown in FIG. 2, 15 in the figure
Is an anchor metal fitting, 16 is a second anchor metal fitting made of channel steel, and the second embodiment is RC on the top floor of the building.
At the joint 4 between the upper part of the pillar 1 and the steel beam 3, the RC pillar 1
At least two anchor hardware 1 on the upper side of the upper steel beam 3
5 and 16 are arranged at a distance from each other and are arranged in a cross shape, and the anchor metal fittings 15 and 16 are arranged on both sides of the steel beam 2 to the column main bar 2
The method of fixing the upper ends of the column main bars on the uppermost floor, which are fixed and arranged on the upper ends 2a of

The second embodiment is two each compared to the first embodiment.
The anchor metal pieces 15 are formed to be relatively small so that concrete can be easily placed.
The present invention is characterized in that each anchor metal piece 15 and each anchor metal piece 16 are paired and combined with each other.
The strength of the upper part of the and the deformability of the RC column 1 head at the joint 4 are further increased. Other configurations are similar to those of the first embodiment, and basically have the same operation and effect.

Although both of the illustrated embodiments have a structure in which a steel beam is disposed above the RC column in only one direction, it is also possible to connect the steel beam and the RC beam in a perpendicular direction if necessary. Applied. In addition, the anchor metal fitting 15 of the second embodiment has a structure in which the number of anchor metal fittings of the first embodiment is increased as necessary, and the anchor metal fitting 15 of the second embodiment has a structure in which it is fixed to six pillar main bars as in the second embodiment. If necessary, it is possible to adopt a structure in which four pillar main bars are fixed or the number thereof is increased as in the first embodiment. Further, the fixing means between the anchor metal member and the column main bar may be welded or the like in addition to the bolt connection.

[0013]

As described above, according to the present invention, at the joint between the RC column and the steel beam on the uppermost floor of the building, at least two anchor metal parts are arranged on the steel beam on the RC column with a space between them. It is arranged in a cross shape, and the upper ends of the main columns of the columns, which are arranged on both sides of the steel beam, are fixed and connected to each anchor metal piece for easy construction. It is arranged in a cross shape with the space between and fixed to the main bars of each of the columns on both sides of the steel beam, and its anchor performance is effectively enhanced, and the deformation load applied to the joint is from the steel beam to each anchor metal. And, it is transmitted to the column main bar and is effectively shared by both tensile forces, the strength of the RC column head is remarkably increased and it becomes a structure that deforms integrally with the steel beam, and the RC column head at the joint between the RC column and the steel beam The deformation resistance of the part Such as Yue to increased stable deformation performance even when a load of large deformation is obtained, and significantly improved deformation strength of RC stigma portion, the reliability of the junction of the top floor of the RC-column steel beam.

[Brief description of drawings]

FIG. 1 is a front view (A) showing the first embodiment of the present invention, an XX sectional view (B) and a plan view (C) thereof.

FIG. 2 is a front view (A) showing a second embodiment, a YY sectional view (B) and a plan view (C) thereof.

FIG. 3 is a side view (A) showing a conventional example and a side view (B) showing another conventional example.

[Explanation of symbols]

 1 RC Column 2 Column Main Bar 2a Upper End (Column Main Bar) 3 Steel Beam 4 Joint (RC Column / Steel Beam) 5,15,16 Anchor Hardware

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Sato 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Claims] 1. At the joint between the upper part of the RC column and the steel beam on the uppermost floor of the building, at least two anchor metal parts are spaced apart from each other on the upper side of the steel beam arranged on the upper part of the RC column, and are connected to the steel beam. A method for fixing the upper end of the column main bar on the uppermost floor, wherein the two anchor metal pieces are arranged in a cross shape and fixedly connected to the upper ends of the column main bars on both sides of the steel beam.