JPH0596206U - Joint structure of reinforced concrete columns and steel beams - Google Patents

Abstract

(57) [Summary] [Purpose] The mechanical properties are good and the required yield strength can be secured at the joint. [Structure] Inside the rectangular steel pipe 30, the steel pipe 3 is arranged in the axial direction.
6 is provided. The length of the steel pipe 36 is the same as or longer than that of the rectangular steel pipe 30 in order to ensure the stress transmission between the pillar and the beam. A connecting member 40 made of a cross-shaped steel plate is welded to the upper end and the lower end of the square steel pipe 30 so as to close the steel pipe 30, and the steel pipe 36 and the square steel pipe 30 are integrally connected. The stress of the joined steel beam 20 is the square steel pipe 30,
It is reliably transmitted to the reinforced concrete column 10 via the connecting member 40 and the steel pipe 36.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a column-beam joint of a composite structure having a reinforced concrete column and a steel frame beam.

[0002]

[Prior art and its problems]

 Buildings such as office buildings, shopping centers, and warehouses have a structural type consisting of reinforced concrete columns and steel beams. This structure type is excellent in that it can have a long span and can streamline construction, but since it is used to assemble dissimilar structural members such as reinforced concrete and steel frames, these members are used. The stress transmission in the joint of the has become an important issue.

In Japanese Patent Laid-Open No. 1-290844, in order to join a reinforced concrete column and a steel beam with sufficient mechanical strength, the joint between the reinforced concrete column and the steel beam is covered with a steel plate, Disclosed is a joint structure in which cross-shaped horizontal diaphragms respectively connected to the upper and lower flanges of the steel beam are provided so as to project outward from the steel plate, and further, the horizontal diaphragm is provided with a hole for concrete filling and a hole for penetrating a reinforcing bar. It

Since this joint structure covers the joint portion with a steel plate, it is excellent in that the concrete restraint effect in the panel zone is large, but the steel plate covering the joint portion is provided with a horizontal diaphragm so as to project. It has a problem that the processing work of is complicated.

Further, Japanese Patent Application Laid-Open No. 3-51440 discloses a structure in which a column / beam stress transmitting member made of a stud bolt or a reinforcing rod cage is arranged inside a panel zone of a joint between a reinforced concrete column and a steel beam. ing. Although the above-mentioned joint structure is intended to improve workability, there is still room for improvement in order to accurately transmit the shearing force generated in the beam.

[0006]

[The purpose of the device]

 The object of the present invention is to secure a required yield strength while adopting a simple structure at the joint between a reinforced concrete column and a steel frame beam, and to make prefabrication easy and to improve workability during erection. It is to provide a good joint structure.

[0007]

[Device configuration]

 According to the present invention, in the joint structure of a reinforced concrete column and a steel beam where the joint between the reinforced concrete column and the steel beam is covered with a steel pipe or steel plate, a steel pipe extending in the axial direction of the column is fixed in the joint panel zone. It is characterized by.

[0008]

[Action]

 In the joint structure of a reinforced concrete column and a steel beam, the stress of the steel beam is reliably transmitted to the reinforced concrete column via the steel pipe or steel plate surrounding the joint and the steel pipe arranged inside. Further, the outer steel pipe or steel plate accurately restrains the concrete in the panel zone.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an assembled perspective view of a joint between a reinforced concrete column and a steel beam according to the present invention.

At the joint between the precast reinforced concrete column 10 containing the column main bar 12 and the steel beam 20, the height is equal to that of the steel beam 20, and the cross section of the column 10 has the same square shape. The steel pipe 30 is installed. The rectangular steel pipe 30 may be formed by welding a plurality of steel plates, and the shape thereof is not limited to the rectangular shape and may be a round shape.

Inside the square steel pipe 30, a steel pipe 36 is arranged in the axial direction. The shape of the steel pipe 36 is not limited to the round shape, and may be a square shape. The diameter of the steel pipe 36 is determined by the sizes of the reinforced concrete column 10 and the steel beam 20, and the intervals and the number of the column main bars 12, but the range of 1/4 to 3/4 of the diameter of the column 10 is appropriate. is there. The length (height) of the inner steel pipe 36 is the same as or longer than that of the rectangular steel pipe 30 in order to ensure the stress transmission between the columns and the beams. In this embodiment, the rectangular steel pipe 30 is extended slightly in the vertical direction.

A connecting member 40 made of a cross-shaped steel plate is welded to the upper end and the lower end of the rectangular steel pipe 30 so as to close the steel pipe 30, and the inner steel pipe 36 is fitted to the connecting member 40. A central hole for fitting and a small hole 42 for inserting the column main bar 12 are bored, and an inner steel pipe 36 is welded to the central hole to integrally join the steel pipe 36 and the square steel pipe 30. There is.

The steel beam 20 made of H-shaped steel is joined to the side surface of the rectangular steel pipe 30 from four sides. In this embodiment, the length of the connecting member 40 in the cross direction is set to be long, and the cross-shaped end portion and the upper and lower flanges 22 of the steel beam 20 are bolted to each other. Further, the web 24 is bolted via a gusset plate 26.

Various types of methods can be adopted for joining the square steel pipe 30 and the steel beam 20. For example, it is also possible to shorten the length of the connecting member 40 in the cross direction so as to slightly project from the rectangular steel pipe 30 and butt weld the upper and lower flanges 22 of the steel beam 20. FIG. 2 shows a plan view of a joining portion adopting such a joining method, and FIG. 3 is a vertical side view of the central portion of FIG. 2 and 3, the same members as those shown in FIG. 1 are designated by the same reference numerals as those in FIG.

Further, the joint portion shown in FIGS. 4 and 5 in a plan view and a vertical side view shows an embodiment in which a bracket 28 is provided on an outer side portion of a rectangular steel pipe 30 and the steel beam 20 is joined via the bracket 28. Showing.

Other embodiments can be adopted for the connecting member 40 that connects the outer rectangular steel pipe 30 and the inner steel pipe 36. 6 and 7 show a plan view and a vertical side view of a column-beam joint using a deformed joining member 40. The member 40 has vertical upper and lower end portions between the inner and outer steel pipes 36 and 30. The ribs are connected in a cross direction with different ribs. In FIG. 7, the same stress transmission effect can be obtained by connecting the ribs located above and below to form a single rib plate having the same length as the steel pipe 36.

In the present invention, the joint portion surrounded by the rectangular steel pipe 30 is manufactured in advance in a factory or the like. That is, the inner steel pipe 36 is welded to the square steel pipe 30, and if it is a full PC material, the column 10 and the square steel pipe 30 are integrally cast into concrete. At the site, after the reinforced concrete columns 10 are installed at a predetermined position, the ends of the steel beam 20 can be moved from four sides and joined to the side surface of the square steel pipe 30.

On the other hand, when the column 10 is made of a half PC material, the square steel pipe 30 having the internal steel pipe 36 welded thereto is placed on the column head of the reinforced concrete column 10 that has been built, and then the steel beam 20 is square-shaped. After joining to the steel pipe 30, concrete is poured inside the panel zone. Since the column main bars 12 and the internal steel pipes 36 are only arranged in the panel zone, the concrete is smoothly filled.

In the joint structure of the reinforced concrete column and the steel beam, the stress of the joined steel beam 20 is surely transmitted to the reinforced concrete column 10 via the rectangular steel pipe 30, the connecting member 40 and the inner steel pipe 36. Further, the external rectangular steel pipe 30 accurately restrains the concrete in the panel zone.

That is, the tensile and compressive forces of the beam end portion generated by the bending moment of the steel frame beam 20 are transmitted to the coupling member 40 via the outer rectangular steel pipe 30, and are resisted by the inner steel pipe 36. At that time, in addition to the inner steel pipe 36, the shear resistance of the outer rectangular steel pipe 30 can be expected against the shearing force generated in the panel zone. Further, even against the shearing force of the steel beam 20, the inner and outer steel pipes 36, 30 effectively act and are reliably transmitted to the column 10 as an axial force.

[0021]

[Effect of the device]

 The joint structure of a reinforced concrete column and a steel beam according to the present invention has good mechanical properties, the stress of the steel beam can be reliably transmitted to the reinforced concrete column, and the required proof stress at the joint can be secured.

Further, according to the present invention, by adopting a simple structure of disposing the steel pipe in the panel zone, the joint can be manufactured and processed at a low cost in a factory. In addition, the workability during erection is extremely excellent, and significant effects such as significant labor saving and shortening of the construction period can be achieved.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing a joint portion between a reinforced concrete column and a steel beam.

FIG. 2 is a plan view showing a joint part in which the joint form is modified.

FIG. 3 is a vertical side view of the central portion of FIG.

FIG. 4 is a plan view showing a joint using a bracket.

5 is a vertical side view of the central portion of FIG.

FIG. 6 is a plan view of a joint portion showing a modified example in which a rib is used as a coupling member.

7 is a vertical sectional side view taken along line VII-VII of FIG.

[Explanation of symbols]

 10 Reinforced concrete columns 20 Steel beams 30 Rectangular steel pipes 36 Internal steel pipes 40 Coupling members

Claims (1)

[Scope of utility model registration request] 1. In a joint structure of a reinforced concrete column and a steel beam, in which a joint between the reinforced concrete column and the steel beam is covered with a steel pipe or a steel plate, a steel pipe extending in the axial direction of the column is fixed in the joint panel zone. A joining structure characterized by the above.