JPH0651302U - Joint structure of reinforced concrete columns and steel beams - Google Patents

Abstract

(57) [Summary] [Purpose] To secure the required proof stress at the joint while adopting a simple structure. [Structure] The joint metal 10 is formed by welding an H-shaped steel to be the bracket 6 to the corner portion of the outer peripheral surface of the rectangular steel pipe 12. Regarding the size of the rectangular steel pipe 12, the maximum length of one side in the cross section is about the length of one side in the cross section of the reinforced concrete column 2, and the minimum length of the diagonal line in the cross section of the steel pipe 12 is the reinforced concrete column 2. Within the range of the length of one side. Around the steel pipe 12, a band plate 14 is wound in multiple stages and welded so that the band plate 14 is arranged along the inner peripheral surface of the column when the reinforced concrete column and the steel beam are joined.
In the joining structure using the joining hardware 10, the stress of the joined steel beam is surely transmitted to the reinforced concrete column via the square steel pipe 12. Also, the band plate 14
Restrains the concrete in the panel zone and also resists shear forces in the panel zone.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a column-beam joint portion 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 structural type is excellent in that it can have a long span and can streamline construction, but since it is used to assemble different structural members such as reinforced concrete and steel frames, these members are used. The stress transmission at the joint of is an important issue.

In Japanese Patent Laid-Open No. 1-290844, in order to join a reinforced concrete column and a steel frame beam while maintaining sufficient mechanical strength, a joint between the reinforced concrete column and the steel beam is covered with a steel plate, and 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 above 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 with steel plates, the effect of restraining the concrete in the panel zone is great, and the steel plate is excellent in resisting shearing. There is a problem in that the work of processing a steel plate becomes complicated, such as when a horizontal diaphragm is projected.

Further, as a joint structure between a reinforced concrete column and a steel frame beam having a simple structure, Japanese Patent Application Laid-Open No. 1-212425 discloses a structure in which a steel pipe extending in the axial direction of the column is arranged in the central portion of the panel zone. There is. In this joint structure as well, the joint is covered with a steel pipe or steel plate that also serves as a concrete pouring formwork in order to protect the joint from pressure bearing failure and to increase rigidity.

It is explained that the above-mentioned joining structure is a simple structure that does not require assembly in a factory. However, since the closing plate covering the outer circumference of the joining part and the internal steel pipe are provided side by side, the joining part hardware However, there is still room for improvement in workability on site.

[0007]

[The purpose of the device]

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

[0008]

[Constitution of device]

This invention is a joint structure of a reinforced concrete column and a steel beam, in which a steel beam or beam bracket is welded to the corners of the outer peripheral surface of a square steel pipe arranged at the center of the joint, and the length of one side of the steel pipe cross section The length of one side of the cross section of the column is 1-2 to ^1/2 times, and the circumference of the steel pipe is welded to the corner portion of the steel pipe or penetrates the portion to form a band plate or a hoop bar. It is characterized by being wound.

[0009]

[Action]

 In the above-mentioned joint structure, the stress of the joined steel beam is surely transmitted to the reinforced concrete column through the square steel pipe. Band plates or hoops also restrain the concrete in the panel zone and resist the shear forces in the panel zone.

[0010]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a metal joint 10 used for joining a reinforced concrete column and a steel beam through a beam bracket, and FIGS. 2 and 3 are joints of a reinforced concrete column and a steel beam by the metal joint 10. It is a side view and a top view of a structure.

As shown in FIG. 1, the metal joint 10 is formed by welding an H-shaped steel to be the bracket 6 to the corners of the outer peripheral surface of a rectangular steel pipe 12. Regarding the size of the rectangular steel pipe 12, the maximum length of one side in the cross section is about the length of one side in the cross section of the reinforced concrete column 2, and the minimum length of the diagonal line in the cross section of the steel pipe 12 is reinforced concrete. It is suitable that it is within the range of the length of one side of the pillar 2.

If the length of one side of the steel pipe 12 is shorter than the minimum length, the bracket 6 may deeply enter the inside of the reinforced concrete column 2, which may cause the column 2 to bear pressure. On the other hand, when the length of one side of the steel pipe 12 exceeds the maximum length, not only the weight of the joint metal 10 is increased, but also the steel pipe 12 protrudes more than the reinforced concrete column 2 so that the stress of the bracket 6 is increased. This is because it will be unclear whether or not it can be reliably transmitted to

The length (height) in the axial direction of the steel pipe 12 is the same as or slightly longer than that of the beam of the bracket 6 in order to ensure the stress transmission between the pillar and the beam. The rectangular steel pipe 12 may be formed by welding a steel plate.

Around the steel pipe 12, a band plate 14 is wound in multiple stages and welded, and when the reinforced concrete column 2 and the steel beam 4 are joined, the band plate 14 extends along the inside of the outer peripheral surface of the column 2. To be arranged.

In order to assemble the reinforced concrete column 2 and the steel beam 4 using the above-mentioned joining hardware 10, the joining hardware 10 manufactured in advance in a factory or the like is carried to the site and mounted on the pillar head of the reinforced concrete pillar 2. After placing, the steel beam 4 is moved from all sides to join the steel beam 4 and the bracket 6. The joining method may be either bolt joining or welding.

After the joining, concrete is poured inside the panel zone. Since only the square steel pipe 12, the band plate 14 and the column main bar 8 are arranged in the panel zone, the concrete is smoothly filled. Further, in the present invention, since the members are not concentrated in the panel zone, there are almost no restrictions on the number of the main bar reinforcements 8, the diameter of the reinforcing bar and the arrangement.

When the pillar 2 is made of a full PC material, a reinforced concrete pillar 2 in which the pillar 2 and the joint metal 10 are integrated and a concrete is cast is factory-manufactured, and this is joined to the steel frame beam 4 built on site. To do.

FIG. 4 shows a plan view of the joint structure of the reinforced concrete column 2 and the steel beam 4 when the bracket 6 is not used. In this embodiment, the length of one side in the cross section of the rectangular steel pipe 12 is made equal to the length of one side in the cross section of the reinforcing steel concrete column 2, and the hoop reinforcement 16 is used instead of the band plate 14. And was wound in multiple stages around the steel pipe 12.

In the joint structure of the reinforced concrete column 2 and the steel beam 4, the stress of the joined steel beam 4 is reliably transmitted to the reinforced concrete column 2 via the rectangular steel pipe 12. Further, the band plate 14 or the hoop muscles 16 restrain the concrete in the panel zone and also resist the shearing force of the panel zone.

That is, the tensile and compressive forces at the beam ends generated by the bending moment of the steel beam 4 are transmitted to the column-beam joints via the bracket 6 and resisted by the square steel pipe 12. At that time, in addition to the steel pipe 12, shear resistance of the band plate 14 and the hoop muscle 16 can be expected against the shearing force generated in the panel zone.

In the present invention, as shown in FIG. 5, a central hole 20a for pouring concrete and a column main bar 8 are provided at the upper end and the lower end of the rectangular steel pipe 12 so that the steel pipe 12 is closed. The rectangular steel pipe 12 may be reinforced by providing a horizontal diaphragm 20 having a small hole 20b for insertion.

[0022]

[Effect of device]

 The joint structure between the reinforced concrete column and the steel beam according to the present invention has good mechanical properties, and 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, the present invention adopts a simple structure in which a rectangular steel pipe having a predetermined size is arranged in the panel zone, so that the joint can be manufactured and processed at a low cost in a factory. Furthermore, since the weight of the joint metal is light, the workability during erection is extremely excellent, and significant labor saving and shortening of the construction period can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a metal joint.

FIG. 2 is a side view showing an example of a joint structure of a reinforced concrete column and a steel frame beam.

FIG. 3 is a plan view of the above junction structure.

FIG. 4 is a plan view showing a modified example of the joint structure of a reinforced concrete column and a steel frame beam.

FIG. 5 is a plan view showing a joint structure of columns and beams provided with a horizontal diaphragm.

[Explanation of symbols]

 2 Reinforced concrete columns 4 Steel beams 6 Beam brackets 10 Joint hardware 12 Rectangular steel pipes 14 Band plates 16 Hoop muscles 20 Horizontal diaphragms

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Takaaki Miyahara No. 2 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo head office (72) Creator Tsuyoshi Tsuji No. 2 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office

Claims (1)

[Scope of utility model registration request] 1. A joint structure of a reinforced concrete column and a steel beam, wherein a steel frame beam or a beam bracket is welded to a corner portion of an outer peripheral surface of a square steel pipe arranged at the center of the joint part, the length of one side of the steel pipe cross section. 1 to 2 of the length of one side of the column cross section
^-1/2 times, a joint structure characterized in that a band plate or a hoop streak is wound around the corner of the steel pipe by welding or penetrating the corner of the steel pipe.