JPH01260135A - Structure of junction between reinforced concrete column and steel framed beam - Google Patents

Abstract

PURPOSE:To improve the effect of a stress transfer mechanism in joint sections between a column and beams by fixing horizontal plates of the reinforced concrete column to the periphery of corner angle sections of bean joining metal tools which are an angular cylindrical body and has the middle part of a vertical height thicker than vertical tips. CONSTITUTION:External ribs 2a are projected and provided to corner angle sections of angular cylindrical beam joining metal tools 2 in the peripheral direction of the middle part of a vertical height, and horizontal plates 7 are welded to each of them. The beam joining metal tools 2 are such that steel framed beams 3... joined into concrete surrounded by main reinforcements 4 of the joint section of a column 1 and hoops 5 are buried into two steps of up and down of flange positions. Vertical plates 6 and 6 coupled with the hoops 5 and 5 are projected and provided to the side of the column 1 between the up and down beam joining metal tools 2 and 2, and the beams 3 and 3 are coupled with up and down flanges 3a, 3a and the horizontal plates 7, 7 by means of coupling bolts 8 and 8 to join to the joint section of the 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 a column is a pure reinforced concrete column and a beam is a pure steel beam, the connection between the column and the beam is often a beam penetration method in which only the upper and lower flanges of the beam or the entire beam penetrates the column.

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. In other words, the stress acting on the beam is transmitted to the column through the concrete of the column attached to the beam, and if the beam and concrete are separated, stress transmission becomes impossible.

[Problem to be solved by the invention]

However, in order to rely solely on the adhesion force of concrete for stress transmission between columns and beams, the attachment area of the steel beams needs to be considerably large, so the beam cross section and gusset plate need to be made considerably thicker. In general, steel frames have poor adhesion to concrete, so it was necessary to devise measures such as installing stud bolts protruding from the surface of beams and gusset plates.Furthermore, as the cross-sections of beams and gusset plates became larger, stud bolts became more difficult to adhere to. When installed, it was inevitable that the strength of the concrete would deteriorate significantly, and it was not desirable and even dangerous to expect the adhesion of the concrete to match the designed value.

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 this paper is to provide a column-beam joint structure for joining reinforced concrete columns and steel beams that enables economical design by making the stress transmission mechanism between the beams extremely efficient.

[Means to solve the problem]

The joint structure between a reinforced concrete column and a steel beam according to the present invention uses a cylindrical beam joint hardware.

The beam joint hardware is a cylindrical body that penetrates vertically, and the thickness of the middle part of the vertical height is thicker than the top and bottom ends. A horizontal plate is fixed around the outer periphery of this beam joint metal fitting. The beam joint hardware integrated with this horizontal plate is buried in a reinforced concrete column and arranged above and below, and the horizontal plate is horizontally extended from the reinforced concrete column. Steel beams are bolted to this horizontal plate.

The beam joint hardware is a rectangular cylindrical body, and a horizontal plate is fixed to the outer periphery of the corner.

Alternatively, the beam joint hardware may be a rectangular cylinder, and inner ribs may be formed at the upper and lower middle portions of the inner periphery of the corners.

[For production]

The beam joint hardware is a cylindrical body, and the stress of the beam acts on the side surface of the beam joint hardware as a bearing force of the concrete.

Since the beam joint hardware is thicker at the midpoint between the top and bottom heights, the beam joint hardware is less likely to deform even if stress is transmitted from the horizontal plate.

Furthermore, if the beam joint hardware is made into a rectangular cylindrical body and a horizontal plate is fixed to the outer periphery of this corner, the stress will be shared between the two sides.

Furthermore, the inner rib bears the stress acting on the beam joint metal fittings,
Improves the strength of beam joints.

〔Example〕

Hereinafter, the present invention will be explained by referring to a first embodiment illustrated in the drawings.

In Figures 1 and 2, beam joint hardware 2.2 is buried in the joint part of column 1, and beams 3, 3 are joined to the four sides of column 1 by these beam joint hardware 2, 2. .

The beam joint hardware 2 is a cylindrical body penetrating in the vertical direction, and the thickness at the middle part of the vertical height is thicker than at the top and bottom ends. In the embodiment shown in FIGS. 3 to 6, the beam joint hardware 2
is formed into a rectangular cylindrical body, and outer ribs 2a protruding in four directions are provided at the corners of the beam joining metal fitting 2, which protrude toward the outer circumferential direction at the vertically intermediate portion.

Each horizontal plate 7 is attached to the outer lip 2a of the beam joint hardware 2.
is welded.

As described above, the beam joining hardware 2a integrated with the horizontal plate 7 is buried in 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 beam joint hardware 2 is the main reinforcement 4 at the joint part of the column 1. ...and hoop muscle 5. The steel beams 3 and 3 are buried in two levels above and below the flange positions to be joined in the concrete surrounded by. Furthermore, the beam joint hardware 2 is buried with the horizontal plate 7 positioned at the center of each side surface of the column l, and at least a portion of the horizontal plate 7 extends horizontally from the reinforced concrete column 1.

Further, a vertical plate 6.6 is provided protruding from the side of the column 1 between the upper and lower beam joining metal fittings 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 beam 3.3 is joined to the joint portion of the column 1 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 beam joining hardware 2.2. ing.

Other beam joining metal fittings 2 that can be used include those formed into a rectangular tube shape with inner ribs 2b protruding from the inside of the corners, as shown in FIG. The inner ribs 2b increase the strength of the beam joint hardware 2 and prevent deformation.

Further, as shown in FIGS. 9 and 10, beam joint metal fittings may be used for the cylindrical body.

Furthermore, as shown in Figure 1), a beam joint metal fitting 2 may be adopted in which an inner rib 2b is continuously formed on the inner periphery.

Furthermore, as shown in FIG. 12, a beam joint metal fitting 2 may be employed in which a stepped portion 2C is formed on the outer rib 2a. Is this receiver equipped with a horizontal plate placed on part 2C? Just be accommodating.

〔Effect of the invention〕

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

(b) The beam joint hardware is a cylindrical body, which is buried inside the reinforced concrete company, and the steel beam is connected to a horizontal plate that is integrated with this, so stress transmission between the column and the beam is possible between the concrete and the beam. The stress is reliably transmitted not due to the adhesive force of the beam, but due to the bearing force exerted by the side surface of the cylindrical beam joint metal fittings.

(b) The beam joint hardware is thicker at the upper and lower intermediate parts than at the top and bottom ends, so it has greater strength (even if a large stress is applied to the beam, the beam joint hardware will not deform.

(c) The bearing capacity of the beam joint hardware, that is, the joint strength of the beam joint hardware, can be designed extremely simply by increasing or decreasing the composition of the beam joint hardware.

(d) Beam joining hardware can be made smaller and lighter, and easier to transport and install by separating the parts that join the upper flange of the beam and the ones that join the lower flange.

Additionally, it is also possible to assemble beam joint hardware to prefabricated column reinforcing bars in advance, which can save labor during construction.

(E) Since the beam joint hardware is formed into a cylindrical shape and is buried in the joint part, the concrete has good fluidity when pouring concrete, making it easy to ensure quality.

(f) If the beam joint hardware is formed into a rectangular tube shape and a horizontal plate is fixed for external use at the corner, the stress transmitted from the beam will be received by the two sides, increasing the strength of the beam joint hardware. It becomes difficult to deform. Furthermore, if an inner rib is provided inside this corner portion, the strength of the beam joint metal piece will be increased and deformation will be further prevented.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the column/beam joint, Figure 2 is its longitudinal cross-section, Figure 3 is a perspective view of the beam joint, Figure 4 is its plan view, and Figure 5 is the A sectional view taken along the line V-V in the figure, and FIG.
A sectional view taken along the line Vl, Fig. 7 is a plan view of other beam joint metal fittings, Fig. 8
The figure is a sectional view taken along the line ■-■ of Fig. 7, Fig. 9 is a plan view of other beam joint metal fittings, Fig. 10 is a sectional view taken along the line X-X of Fig. 9, and Fig. 1)
Figures 1 and 12 are cross-sectional views of other beam joint metal fittings. 1... Column, 2... Beam joint hardware, 2a.
...Outer rib, 2b...Inner rib, 3...
... Beam, 4 ... Main reinforcement, 5 ... Hoop reinforcement, 6 ... Vertical plate, 7 ... Horizontal plate, 8 ...・Connection bolt. Figure 1 Figure 7 Figure 8 Figure 9 Figure 1) 0 r/1

Claims (3)

[Claims] (1) A horizontal plate is fixed to the outer periphery of the upper and lower intermediate parts of the beam joint metal fittings, which are cylinders that penetrate vertically and whose thickness at the middle part of the vertical height is thicker than the top and bottom ends, and the horizontal plate is integrated with this horizontal plate. This joint structure between a reinforced concrete column and a steel beam is made by burying the beam joint hardware in a reinforced concrete column and arranging it above and below, and bolting the steel beam to the horizontal plate that extends horizontally from the reinforced concrete column. (2) Claim (1) in which the beam joint hardware is a rectangular cylindrical body, and a horizontal plate is fixed to the outer periphery of the corner of the beam joint hardware.
) Connection structure between reinforced concrete columns and steel beams. (3) The joint structure between a reinforced concrete column and a steel beam according to claim (2), wherein an inner rib is formed at the upper and lower intermediate portions of the inner periphery of the corner portion of the beam joint hardware.