JP3403228B2 - Composite structure of joint between reinforced concrete column and steel beam - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite structure at a joint between a reinforced concrete column and a steel beam. 2. Description of the Related Art In a composite structure of a reinforced concrete column and a steel beam, in which the steel beam is disposed in a reinforced concrete column and joined, a conventional shearing portion is provided at the joint between the reinforced concrete column and the steel beam. Reinforcement with only reinforcing bars does not ensure sufficient safety in the event of an earthquake, so some kind of reinforcement is required. As a method, the outer periphery of the joint between the reinforced concrete column and the steel beam is surrounded by a formwork plate as shown in FIG. Such a composite structure has been devised. [0003] However, in the above-described composite structure, the covering area of the formwork plate 10 is limited between the flanges 30 of the beam, so that the steel beam 20 is not affected by the earthquake.
Of the steel beam 20
However, there is a possibility that the concrete may be sunk into the reinforced concrete column 40 and crush the concrete portion of the column. The crushing caused by this indentation significantly reduces the performance of the joints in the reinforced concrete columns, and in order to prevent these adverse effects, the top and bottom of the joints between the reinforced concrete columns and the steel beams, that is, the ends of the reinforced concrete columns 40 are band plates. Constrained technology is used. However, this band plate needs to be welded to the beam steel before arranging the column main reinforcement, and thus there is a problem in that the band plate is obstructed when arranging the column main reinforcement and the assembly of the reinforcement becomes complicated. [0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a composite structure at a joint between a reinforced concrete column and a steel beam, in which a shearing force and a bending moment generated in the steel beam during an earthquake. To prevent the steel beam from sinking into the reinforced concrete column. [0005] The gist of the present invention for solving the above-mentioned problems is that a beam joint formed integrally with an H-shaped steel in a cross shape is disposed in a reinforced concrete column,
It is a composite structure at the joint between the reinforced concrete column and the steel beam surrounded by a formwork plate around the beam joint, and the upper and lower flanges of the beam joint surrounded by the formwork plate, Along the formwork plate
And a T-shaped support plate having a thickness greater than that of the mold plate is provided, and the mold plate is extended to the height of the support plate. Since a T-shaped support plate is provided on the flange portion of the beam and the height of the formwork plate is extended to the height of the support plate, the concrete restraining effect is enhanced. In addition, the shear force applied to the joint portion is shared by the mold and plate, thereby eliminating the stirrup and also eliminating the mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a composite structure of a joint between a reinforced concrete column and a steel beam according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a composite structure at a joint between a reinforced concrete column and a steel beam, FIG. 2 is a plan view, and FIG. 3 is a sectional view of the same. The joint between the reinforced concrete column 1 and the steel beam 2 is a composite in which a beam joint 3 integrally formed in a cross shape is installed in the reinforced concrete column 1, and the outer periphery thereof is surrounded by a formwork plate 4. Upper and lower flanges 5 of the joined body 3 for beams along the formwork plate 4.
Is welded with a T-shaped support plate 6. The formwork plate 4 surrounds the beam joint 3 at a height extending to the end of the support plate 6 and replaces the formwork at the joint between the reinforced concrete column 1 and the steel beam 2. Column main reinforcements 7 are arranged between the formwork plate 4 and the beam joint 3, and band bars 8 are arranged above and below the beam joints 3 in these column main reinforcements 7. ing. As described above, at the joint between the reinforced concrete column 1 and the steel beam 2, the supporting plate 6 is welded to the flange 5 of the beam joint 3 disposed in the reinforced concrete column 1 and surrounds the periphery thereof. The formwork plate 4 extends to the end of the support plate 6 to form a composite structure. Next, a method of joining the reinforced concrete column 1 and the steel beam 2 will be described. As shown in FIG. 4, the head of the reinforced concrete column 1 erected on the foundation concrete and having the column main reinforcement 7 protruded. Next, the joint body 3 for beams whose periphery is surrounded by the form plate 4 is installed. Next, the beam joint 3 and the formwork plate 4
In addition to arranging the reinforcing bars 8 on the column main bars 7 protruding from the space between them, the formwork 9 is assembled so as to surround these reinforcing bars, and concrete 9a is poured into the formwork 9 to form the reinforced concrete column 1. And the steel beam 2 are joined. FIG. 5 shows a history curve of the beam shearing force and the interlaminar deformation when a loading test was carried out assuming seismic force. A supporting plate was provided on the flange of the beam at the base of the column. It is a reinforced beam. As is clear from the history curves of (1) and (2), the present invention confirms that the toughness of the joint between the reinforced concrete column and the steel beam is remarkably improved as compared with the conventional one. Was completed. According to the present invention, the flange of the beam joint is provided with
Over preparative Bearing plate thickness of the T-shaped provided than by the extending of the formwork combined plates to the height of said supporting plate, it is possible to improve the toughness at the junction of the reinforced concrete columns and steel beams Rutotomoni Bigger force acts
The supporting plate can be made thicker than the formwork plate.
Came . Since the shearing force applied to the joint portion can be shared by the form plate and the plate, the strip can be omitted. Since the periphery of the joint for beams is surrounded by the plate also serving as a mold, the form can be omitted.
It saves the labor of assembling the formwork and is economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a composite structure at a joint between a reinforced concrete column and a steel beam. FIG. 2 is a plan view of the same. FIG. 3 is a sectional view of the same. FIG. 4 is a cross-sectional view in which concrete is cast at a joint between a reinforced concrete column and a steel beam. FIG. 5 is a history curve of beam shear force and interlayer deformation. FIG. 6 is a perspective view showing a conventional composite structure at a joint between a reinforced concrete column and a steel beam. [Description of Signs] 1 Reinforced concrete column 2 Steel beam 3 Joint for beam 4 Formwork plate 5 Flange 6 Support plate 7 Column main bar 8 Band bar

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/16 E04B 1/30

Claims (1)

(57) [Claims 1] A beam joint formed integrally with an H- section steel in a cross shape is disposed in a reinforced concrete column, and the periphery of the beam joint is a plate serving as a formwork. Oh in composite structures at the junction between surrounding the reinforced concrete column and steel beams
Ri, on the formwork combined plates surrounded a beam for assembly
The lower flange is provided with a T-shaped supporting plate having a thickness greater than that of the formwork plate along the formwork plate, and the formwork plate is extended to the height of the support plate. Composite structure at the joint between a reinforced concrete column and a steel beam.