JPH01190841A - Junction structure of reinforced concrete column with steel girder - Google Patents

Abstract

PURPOSE:To allow a stress transmitting mechanism between a column and a girder to function efficiently to high degree so that an economical design can be made by embedding joint fittings into a reinforced concrete column, and thereby joining the column with the girders by way of the joint fittings. CONSTITUTION:Girder joint fittings 2 wherein fitting 2a in a rectangular cross sectional form which are closed and hollow in the vertical direction are provided with horizontal plates 7 integrally welded at their corner sections, are embedded at the upper and lower flange 3a positions of each steel girder 3 in the girder joint of a reinforced concrete column 1. And the girder joint fittings 2 are so constituted to be joined with the upper and lower flanges 3a of each steel girder 3 with connecting bolts 8 at the outside of the concrete column 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a column-beam joint structure for joining a reinforced concrete column and a steel beam.

(Conventional technology) When the columns are pure reinforced concrete columns and the beams are pure steel beams, the connection between the columns and beams can be achieved by a beam penetration method in which only the upper and lower flanges of the beams or the entire beam penetrates the column. Often.

In such a case, the stress transmission mechanism at the joint between the column and the beam is solely due to the adhesive force of the concrete.

(Problem to be solved by the invention) However, in order to rely solely on the adhesion force of concrete for the stress transmission between columns and beams, the adhesion area of the steel beams must be considerably thick, so the beam cross section and gusset It is necessary to make the plate quite large.Also, since steel materials generally have poor adhesion to concrete, it was necessary to take measures such as installing stud bolts protruding from the surface of the beam or gusset plate. As the cross section of the plate becomes larger, when stud bolts are attached, the circumference of the concrete is inevitably reduced significantly, and it is not desirable and even dangerous to expect the adhesion force of concrete to be as designed.

Considering these circumstances, the conventional beam penetration method was not very efficient in terms of structure and tended to be extremely uneconomical in design.

This invention was proposed in order to solve the above-mentioned conventional problems, and the column is a reinforced concrete column,
When the beam is a steel beam, the column and beam at the joint between the column and the beam are
The purpose of the present invention is to provide a column-beam connection structure for connecting reinforced comfort columns and steel beams that enables economical design by making the stress transmission mechanism between the beams extremely efficient.

(Means for Solving the Problems) The present invention is a joint structure of a reinforced concrete column and a steel beam, which are integrated by welding a rectangular cross-sectional metal piece with a vertically closed hollow and a horizontal plate to its corner. The beam joint hardware is separately buried in the beam joint part of the reinforced concrete column at the upper and lower flange positions of the steel beam, and the beam joint hardware and the steel beam are port-jointed on the side of the concrete column. do.

(Example) The present invention will be explained below by referring to a first example illustrated in the drawings.

In FIGS. 1 and 2, metal fittings 2, 2 are buried in the joint part of a column 1, and beams 3,
3 are joined to the four sides of the column 1.

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

Main reinforcement of column 1 4. ... are arranged at regular intervals on the outer periphery of the column 1 with a constant cover thickness, and these main reinforcements 4.・・・
・Hoop muscle around 5. ... are arranged at regular intervals in the vertical direction of the main reinforcement 4° ....

The joining metal fitting 2 is a square cross-section metal fitting 2 with a vertically closed hollow.
A and its corner portion 2b are integrally welded with a horizontal plate 7. In addition, the square cross section metal fitting 2 of the joining metal fitting 2
The size of a is increased or decreased depending on the beam size of the beams 3 to be joined, and when the beam size of the beam 3 is large, the size is increased.

When the size of the joining metal fitting 2 is increased, the bearing pressure area becomes larger,
The bearing pressure strength of the joining hardware 2 is significantly increased.

Therefore, the strength of the joint between columns and beams is determined by the composition of the joining hardware. In order to increase the bonding strength, it is sufficient to increase the thickness.

The joint hardware 2 formed in this way is the main reinforcing bar 4 of the joint part of the column 1. ...and hoop muscle 5. It is buried in two stages above and below the 3°3 flange position of the steel beam that will be joined in the concrete surrounded by...

Further, the joining hardware 2 is buried with the horizontal plate 7 positioned at the center of each side surface of the column 1.

Further, a vertical plate 6.6 is provided protruding from the side of the pillar 1 between the upper and lower joining hardware 2.2.

The vertical plate 6 is connected to the hoop reinforcements 5, 5 in the column 1, and is deeply embedded and fixed in concrete.

The beams 3, 3 are connected by connecting the upper and lower flanges 3a, 3a with a plurality of connecting bolts 8 via the horizontal plate 7.7 of the upper and lower joining hardware 2.2, and connecting the end of the web portion 3b to the vertical plate 6 with a plurality of connecting bolts 8. It is joined to the joint part of the pillar 1 by bolting through the connecting ports 8, 8.

In this embodiment, depending on the case, upper and lower joint metal fittings 2.2
may be connected by a plurality of tie plates 9, 9 (see FIGS. 4 and 5). Furthermore, joining hardware 2.2
Main reinforcing bars 4. are placed not only on the outer periphery of the 4.
...and hoop muscle 5. ... may be arranged (Fig. 6).

(See Figure 7).

8 and 9 show a second embodiment of the present invention, in which the joining hardware 2 is not formed separately on the top and bottom, but
It is integrally formed with a height corresponding to the beam configuration of the beams 3.3 to be joined (see FIGS. 8 and 9). In addition, joining hardware 2
The main reinforcing bars 4.・・・
・In some cases, reinforcement may be arranged (see Figures 10 and 11).

The other configurations are almost the same as the first embodiment.

In addition, in the first and second embodiments, the joint hardware 2 has a rectangular cross section, but is not limited to this and may have a circular cross section.

A metal joint with a polygonal cross section may also be used (Figures 12 and 13).
. Similarly, the pillar 1 may also have a circular or polygonal cross section.

(Effects of the Invention) Since the present invention has the above configuration, it has the following effects.

■ The joint hardware is formed with a closed cross section such as a rectangular hollow cross section or a circular hollow cross section, and is buried in the concrete at the joint so that the hollow part continues vertically, so the stress between the column and beam is reduced. The transmission of stress is not due to the adhesion force between the concrete and the beam, but is due to the bearing force of the joint hardware, and since the joint hardware restrains the concrete in the center of the joint, the efficiency of stress transmission is high, and the beam flange stress is can be effectively transmitted to the pillar joint section.

■ The bearing capacity of the metal joints, that is, the joint strength of the metal joints, can be designed extremely easily by increasing or decreasing the composition of the metal joints.

■ By separating the parts that join the upper flange of the beam and the parts that join the lower flange of the beam, the joining hardware can be made smaller, lighter, and easier to transport and install. In addition, it is possible to assemble the joining hardware to prefabricated column reinforcing bars in advance, which saves labor during construction.

■ The joint hardware is formed into a vertically hollow closed rectangular cross section and is buried in the joint part.
When pouring concrete, the fluidity of the concrete is good, making it easy to ensure quality.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of the present invention, and FIG. 1, FIG. 4, and FIG. 6 are cross-sectional views of the column and beam joints, and FIG. , FIG. 5 and FIG. 7 are longitudinal sectional views thereof, FIG. 3 is a perspective view of the joint metal fittings, and FIGS. 8 to 13 show a second embodiment of the present invention. The figure and Fig. 12 are cross-sectional views of the column and beam joints, and Fig. 9. FIGS. 11 and 13 are longitudinal sectional views thereof. 1. Column, 2. Joining hardware, 3. Beam, 4. Main reinforcement, 5
...Hoop muscle, 6.Vertical plate, 7.Horizontal plate, 8.Connection bolt, 9.Tie plate.

Claims (1)

[Claims] (1) A joint structure between a reinforced concrete column and a steel beam, in which a beam joint hardware is integrated by welding a rectangular cross-sectional metal fixture with a closed hollow in the vertical direction and a horizontal plate to its corner part, and the beam of the reinforced concrete column is integrated with the horizontal plate. A joint structure between a reinforced concrete column and a steel beam, characterized in that the joint parts are separately buried at the upper and lower flange positions of the steel beam at the joint, and the beam joint hardware and the steel beam are connected with bolts on the side of the concrete column.