JP2979361B2 - Joint structure between reinforced concrete columns and steel beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a column / beam panel zone of a composite structure having a reinforced concrete column and a steel beam.

[0002]

2. Description of the Related Art In recent years, structures such as office buildings, shopping centers, and warehouses have adopted a structural form including reinforced concrete columns and steel beams.
This type of structure is excellent in that the span can be skipped and the construction can be rationalized.However, since it is composed of different types of structural members such as reinforced concrete and steel frames, the stress at the joints of these members is Communication is an important issue.

[0003] As a composite structure having a reinforced concrete column and a steel beam, a joint structure as shown in FIG. 7 has been conventionally known. In the composite structure, a steel beam 14 is joined to a bracket 12 vertically projecting from a side portion of a precast concrete column (hereinafter referred to as a PC column) 10 to form a beam on the column. According to this, stress transmission at the joint between the PC column 10 and the steel beam 14 is ensured.

[0004] However, since the column / beam panel zone and the bracket 12 are integrally formed, it is difficult to absorb construction errors during the on-site joining of the columns and beams. In addition, there remain problems such as poor transportation efficiency after the PC columns 10 are manufactured at the factory and complexity of steel frame processing.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joint structure which can secure required strength at a joint between a reinforced concrete column and a steel beam, and can easily absorb a construction error at the time of joining a column and a beam. To provide.

[0006]

SUMMARY OF THE INVENTION A joint structure of a reinforced concrete column and a steel beam according to the present invention has a square or circular joint frame installed at the column head of the reinforced concrete column, and a locking end of the steel beam is engaged inside the joint frame. It is characterized by joining columns and beams by joining.

[0007] As the locking end, it is desirable for construction to use a flat or curved plate of a required size fixed to the end face of a steel beam. Further, it is preferable that a stiffener is formed on a vertical surface of the steel beam where the beam and the outer peripheral surface of the reinforced concrete column intersect.

[0008]

The joint frame is tightly engaged with the locking end of the steel beam to restrict the horizontal movement of the steel beam, so that the stress of the steel beam is reliably transmitted to the reinforced concrete column. In addition, by providing the stiffener, the stiffener restrains the concrete inside the panel zone, so that the mechanical properties of the joint are improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a joint between a PC column and a steel beam according to the present invention, and a plan view of a panel zone thereof is shown in FIG.

[0010] Square joint frames 20A and 20B are installed at the top and bottom of the PC column 10, respectively. Joint frame 20
A and 20B are a square inner frame 22 and a PC pillar 1 respectively.
Outer frame 24 having a size substantially equal to the cross-sectional dimension of
And a connecting portion 26 connecting the central portions of the sides 2 and 24. As described later, the inner frame 22 is for tightly engaging with the end plate 30 to restrict the horizontal movement of the steel beam 14, and the outer frame 24 improves the mechanical properties at the joint, Prior to assembling the PC column 10 and the steel beam 14, the PC column 10 is easily fixed to the PC column 10.

The steel beam 14 is made of H-shaped steel, and is hung between the PC columns 10 and 10 with the ends of the plurality of steel beams 14 sandwiched between the upper and lower joint frames 20A and 20B. In this embodiment, an end plate 30 having a width equal to the flange length of the H-section steel and a height slightly longer than the web length of the H-section steel is welded to the end of the steel beam 14 in advance. In addition, steel beam 14
The stiffener 40 is welded to a vertical surface where the beam 14 and the outer peripheral surface of the PC column 10 intersect. Providing the stiffener 40 improves the mechanical properties of the joint.

Next, the procedure for joining the steel beam 14 to the PC column 10 will be described with reference to FIG. First, after the column main reinforcement 16 is pressed, the PC column 10 in which the lower joint frame 20B is fixed to the column cap is installed at a predetermined position (FIG. 3A). P
The C pillar 10 has a built-in hoop, and the PC pillar 10 is supported by a support 18.

Next, the lower end of the end plate 30 is inserted into the inner frame 22 of the lower joining frame 20B,
The end of the steel beam 14 is placed on the lower joint frame 20B, and the end plate 30 and the inner frame 22 are tightened with bolts 32.
At this time, between the end plate 30 and the inner frame 22,
If necessary, the interval is adjusted by interposing a filler 34 or the like, so that the end plate 30 and the inner frame 22 are in close contact with each other (FIG. 3B).

In the same manner as the above, the steel beam 14 is extended in three directions (FIG. 3C). Finally, the fourth beam 14 in the fourth direction is used as the end plate 30 without using the filler 34.
And the inner frame 22 are brought into close contact with each other, and tightened with bolts 32. Adjustment of the length of the steel beam 14 in the fourth direction and the length between the PC columns 10 and 10 is performed in the panel zone of the next PC column 10, and using the filler 34 or the like at the other end of the steel beam 14. Adjust. After placing all the steel beams 14 on the column capitals, the joint frame 20A is placed on top of the steel beams 14, and the joint frame 20A and the end plate 3 are placed in the same manner as the joint frame 20B.
0 is fixed with a bolt 32 (FIG. 3D).

Finally, after arranging the hoop muscles 42 shown in FIG. 2 around the column main muscles 16, the frame 4 is surrounded by the panel zone.
Attach 4 and cast concrete. The formwork 44 can be easily attached using the stiffener 40.

FIG. 4 is a plan view of a panel zone using another joining frame. The joining frame 20C has a simple structure consisting of only the inner frame 22 constituting the joining frame 20A or 20B.

FIG. 5 is also a plan view of a panel zone using a modified example of the joining frame. The joining frame 20D has a cross-shaped partition member 28 formed inside to form a cross-shaped flat shape. is there. The shape of the end plate 30D that engages with the joining frame 20D is cut out at the upper and lower portions where the partition member 28 fits, corresponding to the shape of the joining frame 20D. By adopting such a configuration, the joining frame 20D after joining the column and the beam is less likely to bleed in the horizontal direction than the joining frame 20C, and the mechanical properties are improved.

FIG. 6 is a plan view of a panel zone using a circular joining frame 20E. In this embodiment, the joining frame 20E
The shape of the end plate 30E that engages with the joining frame 20E is formed so that the horizontal cross section is a quarter-arc shape. In the present joint structure, good mechanical properties can be expected as in the embodiment using the joint frame 20D.

[0019]

According to the present invention, since the stress of the steel beam is reliably transmitted to the reinforced concrete column by adopting the simple structure, the required strength is secured at the joint between the reinforced concrete column and the steel beam. can do. In addition, the present invention has an excellent effect that it is easy to absorb construction errors even in the work of joining columns and beams.

Further, the present invention is free from problems such as the complexity of steel frame processing at the time of manufacturing a factory and the poor transport efficiency of members. The use of a steel beam having a stiffener at a predetermined position also has the advantage that the mechanical properties of the joint are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a joint between a PC column and a steel beam.

FIG. 2 is a plan view of the panel zone of FIG. 1;

FIG. 3 is an explanatory view showing a construction procedure for joining a steel beam 14 to a PC column 10;

FIG. 4 is a plan view of a panel zone using a square-shaped joint frame 20C.

FIG. 5 is a plan view of a panel zone using a cross-shaped joint frame 20D.

FIG. 6 is a plan view of a panel zone using a circular joining frame 20E.

FIG. 7 is a perspective view of a conventional joint between a PC column and a steel beam.

[Explanation of symbols]

 Reference Signs List 10 PC column 14 Steel beam 20A-E Joint frame 30 End plate 40 Stiffener

Claims (3)

(57) [Claims] 1. A joint structure between a reinforced concrete column and a steel beam, in which a square or circular joint frame is installed at the column head of the reinforced concrete column, and a locking end of the steel beam is engaged inside the joint frame. 2. The joint structure between a reinforced concrete column and a steel beam according to claim 1, wherein the locking end is a flat plate or a curved plate of a required size fixed to an end face of the steel beam. 3. The reinforced concrete column according to claim 1, wherein a stiffener is formed on a vertical surface of the steel beam, at which the beam and the outer peripheral surface of the reinforced concrete column intersect. Joint structure of steel beams.