JPH01190843A - Structure for joining reinforced concrete column with steel girder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a joint structure between a reinforced concrete column and a steel beam.

[Conventional technology]

When the columns are reinforced concrete columns and the beams are steel beams,
The joint between a column and a beam can only be the upper and lower flanges of the beam, or
In many cases, a beam penetration method is used in which the entire beam passes through the column.

In such cases, the stress transmission mechanism between the columns and beams at the joint is solely based on the adhesive force of the concrete.

[Problem that the invention seeks to solve]

However, in order to rely solely on the adhesion force of concrete for stress transmission between columns and beams, the adhesion area of the steel beams needs to be considerably large, so the cross section of the beams and the gusset plates need to be made larger.

In addition, since concrete does not adhere well to steel frames, it was necessary to devise measures such as installing stud bolts protruding from the surfaces of beams and gusset plates.

Furthermore, as the cross-section of beams and gusset plates becomes larger, attaching stand bolts will inevitably result in poor concrete circulation, and expecting the adhesion of concrete to match the design value is not desirable and is dangerous. There was even.

Therefore, the beam penetration method is not very efficient in terms of structure and tends to result in an uneconomical design.

This invention was proposed in order to solve the above-mentioned conventional problems, and the column is made of reinforced concrete,
When using steel beams as beams, it is possible to increase the rigidity and toughness of the column and beam joints, ensure stress transmission between the columns and beams at the column and beam joints, and further improve economic design. The purpose is to provide a joint structure between reinforced concrete columns and steel beams that allows for

[Means for solving problems]

The present invention is a joint structure between a reinforced concrete column and a steel beam, in which a beam joint hardware having a closed cross section is provided at the beam joint of the reinforced concrete column so that the hollow part of the beam joint hardware continues vertically and in the direction. Moreover, it is buried in multiple stages, and the main reinforcement and hoop reinforcement of the reinforced concrete column are arranged on the inside and outside of the beam joint hardware, and a steel beam is connected to the side of the beam joint hardware. It is characterized by

[Example] The present invention will be described below based on an illustrative example.

1 and 2 show a first embodiment of the present invention, in which a joining hardware 2.2 is buried in the joint part of a column 1, and a beam 3.3 is embedded in this joining hardware 2.2. The ends are joined.

The column 1 is made of reinforced concrete and has a rectangular cross section.

The joining hardware 2.2 is formed to have a substantially square cross section.

In addition, the height of the joining hardware 2 is increased or decreased depending on the beam size of the beam 3 to be joined, and when the beam size of the beam 3 is large, the height of the joining hardware 2 increases accordingly. Being criticized.

When the height of the joint hardware 2 is increased, the bearing area becomes larger, and the joint strength between the column and the beam is significantly increased. They are buried in two stages, one above and one below, with no regular intervals in the vertical direction. Further, the joining hardware 2.2 has a hollow part continuous in the vertical direction, and each corner part 2a, 2
A is buried in the center of the side surface of the column 1.

A joining plate 7.7 is horizontally protruded from each corner portion 2a, 2a of the upper and lower joining hardware 2.2.

The joining plate 7.7 projects from the surface of the column 1 by a certain length.

A vertical plate 8.8 is protruded between the upper and lower joining hardware 2.2. The vertical plate 8.8 has a hoop striation 5 in the column 1;
... by welding or the like, and is firmly anchored in the concrete, and protrudes a certain length from the surface of the column 1 like the joint plate 7.

The main reinforcements 4, . . . of the column 1 are arranged at regular intervals in the circumferential direction of the column 1 with a constant covering thickness on the outer periphery of the column 1, and the hoop reinforcements 5, . . . are arranged around the main reinforcements 4.・Reinforcements are arranged at regular intervals in the vertical direction of the column 1.

Further, the main reinforcements 4, . . . and the hoop reinforcements 5, . . . are arranged in the same manner inside the joining hardware 2.2. Therefore, the main reinforcements 4, . . . and the hoop reinforcements 5, . Therefore, the rigidity and toughness of the joint portion of the pillar 1 are significantly increased. The inner main reinforcements 4, . . . and the hoop reinforcements 5, .

The tip of the beam 3.3 is installed between the upper and lower joining plates 7.7, and the upper and lower flanges 3a, 3a and the upper and lower joining plates 7.7, and the vertical plate 8 and the web 3b are connected by a plurality of high-strength bolts, respectively. 8, . . . are connected to the pillar 1 by bolting.

3 and 4 show a second embodiment of the present invention. In the first embodiment, some of the inner main reinforcements 4, . . . and hoop reinforcements 5, . This shows an example in which reinforcement is arranged on the outside of the joining metal fitting 2.2.

Further, FIGS. 4 and 5 show a third embodiment of the present invention. In the first embodiment, the outer hoop muscles 5,
. . , the hoop reinforcements 5, .

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

■ The joint hardware is formed into a closed cross-section, such as a rectangular cross-section or a circular hollow cross-section, and is buried in the concrete of the column/beam joint so that the hollow part continues vertically. Therefore, the transmission of stress between the columns and beams is not due to the adhesion force of the concrete, but is due to the bearing force of the joint hardware against the concrete, so that stress can be transmitted reliably between the columns and beams without waste. As a result, there is no need to increase the cross section more than necessary for the purpose of increasing the strength of the joint, making economical design possible.

■ The concrete at the joint is restrained by the joining hardware, and the main reinforcement and hoop reinforcement are placed twice on the outside and inside of the joint, so the rigidity and toughness of the joint can be significantly increased. .

[Brief explanation of the drawing]

1 to 6 show embodiments of this invention,
FIGS. 1, 3, and 5 are cross-sectional views of the column/beam joint, and FIGS. 2, 4, and 6 are longitudinal cross-sectional views thereof. 1... Column, 2... Joining hardware, 3... Beam, 4...
Main reinforcement, 5... Hoop reinforcement, 6... Joint part, 7... Joining hardware 8... Vertical plate.

Claims (1)

[Claims] It is a joint structure of a reinforced concrete column and a steel beam, and a beam joint hardware with a closed cross section is installed at the beam joint of the reinforced concrete column so that the hollow part of the beam joint hardware is continuous in the vertical direction, and in multiple stages above and below. The main reinforcement and hoop reinforcement of the reinforced concrete column are arranged on the inside and outside of the beam joint hardware, and a steel beam is connected to the side of the beam joint hardware. Connection structure between reinforced concrete columns and steel beams.