JPH02261141A - Junction structure of pole and beam - Google Patents

Abstract

PURPOSE:To enhance shearing proof strength and toughness of a reinforced concrete pole by disposing a tubular metal fitting open at both ends between junction metal fittings for joining the reinforced concrete pole with a steel beam and perpendicular to the center portion of the pole, thereby locking core concrete. CONSTITUTION:Junction metal fittings 3 for joining a reinforced concrete pole 1 and a steel beam 2 together are fixed in the pole 1. A tubular metal fitting 4 open at both ends is disposed between the junction metal fittings 3 and perpendicular to the center portion of the pole 1. Then concrete is placed so that the core concrete of the pole 1 is locked. 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 a column in which a reinforced concrete column and a steel beam are connected by a joining metal fitting, and at the same time, a restraining metal fitting is placed inside the reinforced concrete column to restrain the core concrete 1. - Concerning beam joint structure.

(Problem to be Solved by the Invention) The applicant has proposed a structure in which a reinforced concrete column and a steel beam are joined using a joining hardware in the form of a battledore bolt, taking into account the fluidity of poured concrete at the joint and the workability of reinforcing. Although several proposals have been made, it is also desirable to shear-reinforce the joints between concrete columns and beams in order to maintain shear strength and toughness during earthquakes.

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, both ends are open in a reinforced concrete column at the joint with a steel beam, and a restraining hardware having a cylindrical cross section is placed with its axis vertical, thereby forming the core of the reinforced concrete column. It restrains the concrete and improves the shear strength and toughness of the column.

The restraint hardware has the required length and is placed in the center of the reinforced concrete column between the upper and lower joint hardware that connects the steel beams at the same time.

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

As shown in FIG. 1, this invention connects a reinforced concrete column 1 and a steel beam 2 assembled thereto at the same time by straddling orthogonal joining hardware 3 within the reinforced concrete column 1, and also connects the upper and lower joining hardware 3. A cylindrical restraining metal fitting 4 with both ends open is placed in between. In the figure, 1a indicates the main reinforcement, and 1b indicates the hoop.

The joining hardware 3 is a flat plate part 3a that is joined to the flange of the steel beam 2 by bolts 5, and a connecting part 3b that connects the entire flat plate part 3a.
In this embodiment, the stress from the steel beam 2 is transferred to the connecting part 3.
The figure shows an example of the use of a joint 3 in which the connecting portion 3b forms a vertical surface so that a bearing stress of b is transmitted to the reinforced concrete column 1.

As shown in the figure, the restraining hardware 4 is made of a steel pipe or a square steel pipe and has a cylindrical cross-sectional shape, and has a length in the axial direction that corresponds to the structure of the steel beam 2, that is, between the upper and lower flanges of the steel beam 2. a connecting part 3b of the upper and lower joining metal fittings 3, 3 installed astride;
3b, and has an appropriate cross-sectional area that can restrain the core concrete at the center of the reinforced concrete column 1.

This restraining hardware 4 is placed in the center of the reinforced concrete column 1 with its axis vertical and sandwiched between both joining hardware 3.3.

In FIG. 1, the left side of the center line shows the arrangement of the restraining hardware 4, which has a square cross section, and the right side shows the arrangement of the restraining hardware 4, which has a circular cross section.

Both ends of the restraint hardware 4 are open in consideration of the fluidity of concrete, and are arranged either independently or integrated by welding or the like on one side of the joint hardware 3.3. The latter is easier in terms of construction.

(Effects of the Invention) This invention is as described above, and since the core concrete is restrained by arranging a restraining hardware having a cylindrical cross section in the center of the reinforced concrete column, the effect of restraining the concrete at the joint is increased, Its shear strength can be improved.

[Brief explanation of drawings]

FIGS. 1-I and 1-II are a cross-sectional view and a vertical cross-sectional view, respectively, showing an embodiment of the present invention. 1...Reinforced concrete column, 1a...
Main reinforcement, 1b... Hoop, 2... Steel beam, 3... Joining hardware, 3a... Flat plate part,
3b...Connection part, 4...Restriction hardware, 5
······bolt.

Claims (1)

[Claims] 1) A reinforced concrete column and a steel beam are connected by connecting hardware that spans between the steel beams and 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 orthogonally within the reinforced concrete column. This is a joint structure in which a restraining hardware with a cylindrical cross-section of the required length and open at both ends is placed between the upper and lower joining hardware that connects the steel beams at the center of a reinforced concrete column, with the axis vertical. A column-beam joint structure characterized by placing the core concrete at the joint and restraining the core concrete at the joint.