JPH02261140A - Junction structure of pole and beam - Google Patents

Abstract

PURPOSE:To enhance shearing proof strength and toughness of a reinforced concrete pole by installing a plane, squared band plate on upper and lower sides of a cross junction metal fitting which joins the reinforced concrete pole with a steel beam and which is embedded in the pole, the band plate being adapted for engaging the main reinforcement. CONSTITUTION:A cross junction metal fitting 3 for joining a reinforced concrete pole 1 with an I-shaped steel beam 2 is fixed in the pole 1. A band plate 4a extending in the direction of the plane and equipped with corner plates 4b is installed on upper and lower sides of the junction metal fitting 3 so that the main reinforcement 1a of the pole is locked. Next, concrete is placed to construct the pole 1. Shearing proof strength and toughness of the pole 1 are thus enhanced.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to columns and beams that connect a reinforced concrete column and a steel beam with joint hardware, and at the same time, place main reinforcement restraining hardware at the joint to restrain the main reinforcement. This relates to the joint structure.

(Problems to be Solved by the Invention) A reinforced concrete IJ-1 column and a steel beam are connected by a battledore bolt-shaped joining metal fitting that takes into account the fluidity of poured concrete 1 and the workability of reinforcing at the joint. The applicant has previously proposed several structures in which concrete columns and beams are connected, but in order to ensure that the joints between concrete columns and beams have shear strength and toughness during earthquakes, the main reinforcement and concrete are Shear reinforcement is desirable.

This invention has been made based on the series of joint structures described above, and attempts to add a structure that improves the strength and toughness against shearing.

(Means for Solving the Problems) In the present invention, hardware consisting of a hoop-shaped band plate surrounding all the main reinforcements and a corner plate joined to the inner circumferential surface of the band plate is placed at the upper and lower positions of the joining hardware connecting columns and beams. This arrangement restrains the column main reinforcement and core concrete at the joint, improving the shear strength and toughness of the concrete column.

Both the band plate and the corner plate have the required configuration, the band plate having a rectangular planar shape, and the corner plate being joined to the corner portions of the band plate to form a triangular shape.

(Example) The present invention will be explained below based on the drawings showing one embodiment.

This invention, as shown in FIG. A main reinforcement restraining hardware 4 as shown in FIG. 2 is placed at the position.

As shown in FIG. 2, the main reinforcement restraining hardware 4 consists of a planar rectangular band plate 4a that surrounds all the main reinforcements 1a at the same time, and a corner play 1-4b installed diagonally across the band plate 4a, which surrounds all the main reinforcements 1a at the same time. It has an appropriate structure as shown in H to restrain the concrete on the surface. The corner plate 4b is attached to the inside of the hand plate 4a by welding.

The hand plate 4a restrains all the main reinforcements 1a, and the corner plate 4b restrains some of the main reinforcements 1a together with the core concrete.

The manufacturing example shown in FIG. 2-I is a case in which a part of the corner of the band plate 4a is bent, but it is also possible to butt and weld them together as shown in (2).

The main reinforcement restraining hardware 4 shown in Fig. 2 is mainly applied when there are relatively few main reinforcements Ia, that is, when the stress in the column is small. The shape is such that the core concrete is restrained in its shape.

FIG. 1 shows an example of the use of the main reinforcement restraining hardware 4 shown in FIG. 2.

As shown in the diagram, the reinforced concrete column l and the steel beam 2 are
A joining hardware 3 consisting of a flat plate part 3a that is bolted to the plunge of a steel beam 2 and a connecting part 3b that connects the entire flat plate part 3a.
are connected by straddling the steel beams 2 and 2, and the main reinforcing hardware 4 is attached to the flat plate portion 3a of each joining hardware 3 as shown in Fig. 1-■.
placed above and below. In the figure, 5 indicates a bolt, and 6 indicates a hoop or tie hoop.

At this time, the main reinforcement 1a is a part of the corner of the band plate 4a,
Alternatively, it is located at a part of the corner of the corner plate 4b.

The main reinforcement restraining hardware 4 shown in FIG. 3 is a manufacturing example applied when there are relatively many main reinforcements 1a and the cross section of the column is large, and the corner plate 4b is made of core concrete 1. band play to more effectively restrain) 4
They are arranged to form a quadrilateral inside a.

In this case as well, the main reinforcement 1 of the column surrounded by the corner plate 4b
a is located at the corner as shown.

FIG. 4 shows an example of how the main reinforcement restraining hardware 4 shown in FIG. 3 is used.

In this embodiment, the width of the flat plate portion 3a is large, and the connecting portion 3b thereof is large.
This is a case where a joining hardware 3 with a hole 3c for inserting the main reinforcement 1a is used, but the main reinforcement restraining hardware 4 is placed above and below the flat plate part 3a of the joining hardware 3, as in the case of FIG. .

In this embodiment, the main reinforcement 1a on the extension line of the connecting portion 3b is doubly restrained by the joining hardware 3 and the main reinforcement restraint hardware 4.

FIG. 5 shows an embodiment in which the main reinforcing hardware 4 is placed not only at a position below the joining hardware 3 but also between the upper and lower joining hardware 3, 3.

(Effects of the Invention) The present invention is as described above, and main reinforcement restraining hardware having the required configuration is placed at the upper and lower positions of the joining hardware that joins columns and beams, and this hardware is used to connect the main reinforcement of the joint and the core concrete. -1
・Since it is a surface restraint, it can effectively prevent the deformation of the main reinforcement and the bulging of the concrete, and it is possible to increase the shear strength and toughness of the joints of reinforced concrete columns.

In addition, since the main reinforcing hardware is band-shaped, it is easier to install than when hoops are placed closely together, and since it is oriented vertically, it does not interfere with the fluidity of the concrete.

[Brief explanation of drawings]

Figures 1-1 and II are cross-sectional views and vertical cross-sectional views, respectively, showing embodiments of the present invention, and Figures 2 and 3 are examples of manufacturing hardware for main reinforcement restraints. A plan view, ■ is an elevational view, FIG. 2-■ is a partial plan view showing another example of forming a part of a corner, and FIGS. 4-1 and II are cross-sectional views showing other embodiments. , a vertical sectional view, and FIG. 5 is a vertical sectional view showing still another embodiment. 1...Reinforced concrete column, 1a...
Main reinforcement, 2... Steel beam, 3... Joining hardware, 3a... Flat plate part, 3b... Connecting part,
3c...hole, 4...main reinforcement restraint hardware,
4a... Band plate, 4b... Corner plate, 5... Bolt, 6...
・Hoop (tie hoop).

Claims (1)

[Claims] (1) Connecting hardware between a reinforced concrete column and a steel beam consists of a horizontal flat plate part that is bolted to the flange of the steel beam, and a connecting part that connects the flat plate part perpendicularly within the reinforced concrete column, spanning between the steel beams. It has a joint structure in which a rectangular planar band plate with the required configuration is placed around the outer circumference of the main reinforcement of the column in a hoop shape surrounding all the main reinforcement, and a band plate is attached to the inner peripheral surface of the band plate. Main reinforcement restraining hardware consisting of a corner plate having the same required composition, which is joined in a triangular shape with the corner of the main reinforcement, is placed above and below the joining hardware to restrain the main reinforcement and core concrete. Column-beam joint structure.