JPH0569204U - Joint structure of reinforced concrete columns and steel beams - Google Patents

Abstract

(57) [Summary] [Purpose] The stress of the steel beam can be reliably transmitted to the reinforced concrete column, and the processing and assembly of the joint metal are easy. [Structure] A joint metal fitting 10 used for a pillar / beam joint is a column joint 20 made of a steel pipe or a steel plate and a cross-shaped beam joint metal 3.
The beam connecting hardware 30A, 30B is fitted and fixed to the T-shaped notch 22 formed in the column connecting portion 20. If the joining hardware 10 and the steel beam are bolted or welded together, the stress of the steel beam will be
It is transmitted to the pillar via OB and the pillar connection portion 20. Furthermore, since the column connection portion 20 restrains the concrete inside the panel zone, the mechanical properties of the joint portion are also good.

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.

Japanese Utility Model Laid-Open No. 62-75105 discloses a method for joining reinforced concrete columns having a rectangular cross section in order to simplify the construction by omitting the hoop reinforcements and formwork at the beam joints of reinforced concrete columns. In the concrete of the section, a plane cross beam joint metal with a flange formed vertically at the tip of the web is installed, and further, a plate-shaped beam joint reinforcement that surrounds the four sides of this reinforced concrete column is installed. The flange of the joining bracket of the beam having the transverse T-shaped cross section is superposed on the reinforcing metal fitting, and the joining bracket is attached by bolting the flange at the tip of the plane cross-shaped beam joining fitting with a high-strength bolt, and A structure for joining a steel beam to a joining bracket is disclosed. However, this joining structure is a complicated structure because the number of members attached to the joining metal is considerably large.

Further, in Japanese Laid-Open Patent Publication 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, and this steel plate is used. Disclosed is a joint structure in which cross-shaped horizontal diaphragms that are respectively connected to the upper and lower flanges of the steel beam are provided so as to project outward from the steel plate, and that the horizontal diaphragm is provided with a concrete filling hole and a column reinforcing bar penetrating hole. It is being touched. Since this joint structure covers the joint with steel plates, it is excellent in that the concrete restraint effect in the panel zone is large, but the steel plate processing work such as projecting a horizontal diaphragm from the steel plate covering the joint Has the problem that it becomes complicated. In addition, mechanically, the horizontal diaphragm protruding in the panel zone may be tensilely yielded.

[0005]

[The purpose of the device]

 An object of the present invention is to provide a joint structure that can secure a required yield strength while adopting a simple structure at a joint portion between a reinforced concrete column and a steel frame beam, and that can easily process a joint metal product. To do.

[0006]

[Device configuration]

 This invention relates to a joint structure of a reinforced concrete column and a steel beam in which the joint portion of the reinforced concrete column and the steel beam is covered with a steel pipe or a steel plate, and a pair of upper and lower T-shaped cross-section beams connected to the upper and lower flanges of the steel beam respectively. The connecting hardware is provided from one end to the other end of the steel pipe or steel plate so that the ribs face each other, and the upper and lower ends of the steel pipe or steel plate have T-shaped notches capable of receiving the beam connecting hardware. It is

[0007]

[Action]

 In the above-mentioned joint structure, the stress of the steel beam is reliably transmitted to the reinforced concrete column through the beam connecting metal and the steel pipe or steel plate at the joint. Further, since the beam connection hardware has ribs, there is no risk of causing tensile yielding. Furthermore, since the steel pipe or steel plate restrains the concrete inside the panel zone, the mechanical properties of the joint are good. Become.

[0008]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an assembly drawing of a metal joint used for a joint between a reinforced concrete column and a steel beam according to the present invention. The metal joint 10 includes a prismatic column connection portion 20 and a cross-shaped beam connection hardware 30A, 30B. Composed of.

The column connection portion 20 can be manufactured from a steel pipe or a steel plate, and its height is made equal to that of an H-shaped steel beam to be the steel frame beam 12. In the case of manufacturing with a steel pipe, the column connecting portion 20 is easily assembled, while in the case of manufacturing the column connecting portion 20 using a steel plate, the notch 22 described below is easily processed. Four T-shaped notches 22 are formed in the upper and lower ends of the column connecting portion 20 for fitting beam connecting metal pieces 30A and 30B, which will be described later. In FIG. 1, the notch 22 is notched so that the upper and lower ends of the column connection part 20 and the flange surfaces of the beam connection fittings 30A, 30B are aligned, but the notch 22 is not limited to this, and the notch 22 may be used to connect the beam connection The metal fittings 30A and 30B may be located inside the pillar connection portion 20.

The beam connection hardware 30A, 30B includes a cross-shaped flange 32 and a rib 34 provided perpendicularly to the flange 32. Therefore, the cross section of the beam connecting hardware 30A, 30B is T-shaped, which is a so-called cut tee beam. The width of the flange 32 is equal to the flange width of the steel beam 12. Further, the height of the rib 34 is not particularly limited, but may be any height as long as the beam connecting hardware 30A, 30B does not cause tensile yielding.

FIG. 2 is a perspective view of the joint between the reinforced concrete column 14 and the steel beam 12 using the joint metal 10. In order to join the steel beam 12 to the reinforced concrete column 14, for example, after the column main bar 16 is pressure-welded, the beam connecting hardware 30A, 30B is welded to the upper and lower ends of the column connecting portion 20 to form the weld metal assembly 10 on the ground. After fixing to the head of the column, a precast rebar concrete column 14 is erected at a predetermined position.

Next, the ends of the steel beam 12 are brought close to each other from the four sides, and the flange end of the steel beam 12 and each end of the flanges 32 of the beam connecting hardware 30A, 30B are welded. A gusset 18 is applied to the web of the steel frame beam 12 and bolted to the outer peripheral portion of the column connecting portion 20. In the present invention, various methods can be adopted for joining the joint metal 10 and the steel beam 12, for example, FIG. 3 is a vertical cross-sectional side view of a central portion of a column-beam joint. As shown in the section, a gusset 18 is applied to the flange end of the steel beam 12 and each end of the flange 32 of the beam connecting hardware 30A, 30B for bolting. The right half of FIG. 3 shows the vertical side view of FIG.

After connecting the column and the beam, concrete is placed inside the metal joint 10. The concrete is smoothly filled because the ribs 34 only partially extend within the panel zone.

With the above-described joint structure, the stress of the steel frame beam 12 is reliably transmitted to the reinforced concrete column 14 via the beam connecting hardware 30A, 30B and the column connecting portion 20. Further, since the prismatic steel pipe-shaped column connection portion 20 restrains the concrete inside the panel zone, the mechanical properties of the connection portion are improved.

[0015]

[Effect of the device]

 The present invention ensures the stress of the steel beam by adopting a structure in which a joint metal is provided at the joint between the reinforced concrete column and the steel beam, and the cross-sectional shape of the beam connecting metal penetrating through the joint is T-shaped. It can be transmitted to a reinforced concrete column and the required yield strength can be secured at the joint.

Further, since the present invention adopts a simple structure for the joint, it has an excellent effect that the processing and assembling of the steel pipe and the steel plate used for the joint are extremely easy.

[Brief description of drawings]

FIG. 1 is an assembly drawing of a metal joint used for a joint between a reinforced concrete column and a steel beam.

FIG. 2 is a perspective view of a joint portion between a reinforced concrete column 14 and a steel beam 12.

FIG. 3 is a vertical sectional side view of a central portion of a joint portion between a reinforced concrete column 14 and a steel beam 12.

[Explanation of symbols]

 10 Joined Hardware 12 Steel Beam 14 Reinforced Concrete Column 20 Column Connection 30A, B Beam Connection Hardware 32 Flange 34 Rib

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 frame beam is covered with a steel pipe or a steel plate, a pair of upper and lower beam connecting metal parts which are respectively connected to upper and lower flanges of the steel beam. Is provided from one end to the other end of the steel pipe or steel plate so that the ribs face each other, and T-shaped notches capable of receiving the beam connection metal fittings are provided at upper and lower ends of the steel pipe or steel plate. Joint structure of reinforced concrete columns and steel beams.