JP3850776B2 - Column-to-beam joint structure in the top layer of reinforced concrete structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column / beam joint structure in the uppermost layer of a reinforced concrete structure.
[0002]
[Prior art]
The invention of Japanese Patent Application Laid-Open No. 2000-355976 is disclosed for the column beam joints in reinforced concrete structures. In this column beam joint, the beam main bar was bent down in the column and fixed. In addition, as shown in FIG. 8, in the uppermost layer in the column beam joint, it is necessary to provide a fixing stub 22 on the column 21 in order to secure the fixing length of the column main reinforcement 20.
[0003]
[Problems to be solved by the invention]
However, in the building as described above, there is a problem that the construction is difficult because the stub protrudes on the top floor, and the design looks bad.
[0004]
The present invention has been made in view of the above problems, and an object thereof is to provide a column-to-beam joint structure in the uppermost layer of a reinforced concrete structure that is easy to construct and has a good design. It is.
[0005]
[Means for Solving the Problems]
Bonding structure for pillars and beams in the uppermost layer of reinforced concrete structures for solving the above problems, in the beam-column joints of the uppermost layer of reinforced concrete structures, the upper end portion of the reinforcement has been pillar main reinforcement in Column junction portion Fixing plate is provided , and the beam upper bar in the beam-column joint is bent and laid, and a fixing plate is provided at the tip of the beam lower bar in the beam-column joint. The U-shaped stigma reinforcement is directed downward and its vertical portion is inscribed in the band and along the column main reinforcement, and is arranged in a direction orthogonal to the beam upper main reinforcement . In addition , the beam upper bar in the beam-column joint is arranged in a direction parallel to the beam upper bar with the U-shaped stigma reinforcement facing downward and its vertical part inscribed in the band and along the column bar. Including what has been done . Also the distal end of the beam upper main reinforcement of in fold bending reinforcement has been Beam the joint is intended to include the fixing plate is provided.
In addition, the column-to-beam joint structure in the uppermost layer of the reinforced concrete structure is provided with a fixing plate at the upper end of the column main reinforcement arranged in the beam-to-column joint at the column beam joint in the uppermost layer of the reinforced concrete structure. The beam main bar is laid through the beam-column joint. The beam upper bar in the beam-column joint has a U-shaped column head reinforcement facing downward and its vertical part is inscribed in the band and the column main bar. , The bar is arranged in at least one direction orthogonal to or parallel to the beam upper main bar. In addition, the columnar main bars include the arrangement of core bars.
[0006]
Columns in the uppermost layer of a reinforced concrete structure that is easy to construct and has a good appearance in design, because the column reinforcement is stored in the beam and the fixing force is secured by the fixing plate at the upper end, so there is no need to provide a stub. And can be built with a beam connection structure. Deformation performance and toughness at the column beam joint can be sufficiently ensured by the stigma reinforcement or core.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a column-to-beam joint structure (hereinafter referred to as a column- to-beam connection structure) in the uppermost layer of the reinforced concrete structure of the present invention will be described in detail below with reference to the drawings. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals.
[0008]
The present embodiment is directed to a column-to-beam joint structure in the outer periphery of the uppermost layer of a reinforced concrete structure, and FIG. 1 illustrates the first embodiment, that is, an L-shaped column-to-beam joint structure. It is.
[0009]
In the column-to-beam joint structure 1, the column main reinforcement 2 is not protruded from the beam and is arranged in the column-beam connection portion, and a fixing plate 3 orthogonal to the column main reinforcement 2 is provided at an upper end portion thereof. The fixing plate 3 has a flat circular shape, and is screwed into the upper end portion of the column main reinforcement 2. The fixing plate 3 is not limited to a circle but may be an ellipse or a rectangle, and may be provided over a plurality of column main bars 2 (by bundling the column main bars). The main beam 4 extends into the beam-column joint, and the upper main bar 5 is bent downward near the outer column main bar 6. A fixing plate 3 is provided at the tip of the upper main bar and the tip of the beam lower main bar 7 extending to the outer column main bar 6. The fixing plate 3 is also the same as the fixing plate 3 described above, and may be elliptical or rectangular as described above. The beam upper main reinforcement 5 in the beam-column joint is arranged in a direction perpendicular to and parallel to the beam upper main reinforcement 5 with the U-shaped reinforcements 8 and 9 facing downward and inscribed in the band 6a. It is streaked. As shown in FIG. 1, the columnar reinforcement 8 in a direction parallel to the beam upper main reinforcement 5 is arranged with a predetermined length along the column main reinforcement 2 with its vertical portion 8a inscribed in the band and facing the U-shaped downward. In the state of being laid, the bars are arranged along one side or both sides of each beam upper main bar 5, and the column head reinforcing bar 9 perpendicular to the beam upper main bar 5 also faces the U-shape downward, and its vertical portion 9 a is the column main bar. In a state where a predetermined length of the bar is arranged along 2, the beam is arranged so as to straddle the upper main bars 5 of each beam. The stigma reinforcing bars 8 and 9 are not limited to those arranged in the direction orthogonal to and parallel to the beam upper end reinforcing bar 5 as described above, but are arranged only in the direction orthogonal to the beam upper end reinforcing bar 5 or only in the parallel direction. You can also
[0010]
FIG. 2 is a test result showing the relationship between the laminar shear force and the interlaminar deformation angle of the column-to-beam joint structure 1 and confirms that it has sufficient deformation performance and toughness. be able to.
[0011]
FIG. 3 shows a column-to-beam joint structure 10 according to the second embodiment. A beam upper main bar 5 that is bent downward in the column-beam joint extends to the inside of the column, and is attached to the tip of the beam. The fixing plate 3 is not screwed, and other than this, the fixing plate 3 has the same configuration as the column-to-beam joint structure 1 of the first embodiment, and has the same effects.
[0012]
FIG. 4 shows a column-to-beam joint structure 13 according to the third embodiment, in which U-shaped column head reinforcing bars 8 and 9 are arranged in a direction perpendicular to and parallel to the beam upper main bar 5. The structure is the same as that of the pillar-to-beam joint structure 1 of the second embodiment except that the structure is not present.
[0013]
FIG. 5 shows a fourth embodiment, that is, a T-shaped column-to-beam joint structure 14. In this column-to-beam joint structure 14, the column main reinforcement 2 does not protrude from the beam and is arranged in the column beam connection portion, and a fixing plate 3 orthogonal to the column main reinforcement 2 is provided at the upper end portion thereof. The columnar main bar 2 provided with a core bar 15 is formed by arranging bars in a crossing manner. The beam main reinforcement 4 is laid through the column beam joint, and U-shaped column head reinforcement bars 8 and 9 are arranged in the column beam connection in the direction perpendicular to and parallel to the beam upper main reinforcement 5. . In the same manner as described above, the columnar reinforcement 8 in the direction parallel to the beam upper main bar 5 is arranged in a state in which the U-shape is directed downward and the vertical portion 8a is arranged along the column main bar 2 with a predetermined length. The columnar reinforcement 9 is arranged along one side or both sides of the upper main bar 5 and inscribed with the band 6a. Are arranged so as to straddle each beam upper end main reinforcement 5 in a state in which the arrangement is made for a predetermined length along the line and is inscribed in the band 6a.
[0014]
FIG. 6 is a test result showing the relationship between the laminar shear force and the interlaminar deformation angle of the column-beam joint structure 14 described above, and confirms that it has sufficient deformation performance and toughness. Can do.
[0015]
FIG. 7 shows a column-to-beam joint structure 16 according to the fifth embodiment. The column according to the fifth embodiment is the same as the column main bar 2 except that the core bar 15 is not arranged. This is the same configuration as the beam joining structure 14.
[0016]
1, 3, 4 to 6 and 8 are not limited to the uppermost layer of the reinforced concrete structure. The column-to-beam joint structures 1, 10, 13, 14, and 16 are not limited to the uppermost layer of the reinforced concrete structure. It can also be applied to a junction structure. Further, the column-to-beam joint structures 1, 10, 13, 14, and 16 can be applied to the uppermost layer of the steel reinforced concrete structure. The uppermost layer includes the uppermost layer of the setback portion.
[0017]
【The invention's effect】
Since the column main reinforcement is stored in the beam and the fixing force is secured by the fixing plate at the upper end, it is not necessary to provide a stub, so it is easy to construct, and the column in the top layer of the reinforced concrete structure that looks good in design A joint structure of beams can be constructed.
[0018]
Deformation performance and toughness at the beam-column joint could be sufficiently secured by the stigma reinforcement or core.
[Brief description of the drawings]
FIGS. 1A and 1B show a column-to-beam joint structure according to a first embodiment, where FIG. 1A is a plan view and FIG. 1B is a side view.
FIG. 2 is a diagram showing a relationship between a layer shear force and an interlayer deformation angle of a column-beam joint structure according to the first embodiment.
FIGS. 3A and 3B show a column-to-beam joint structure according to a second embodiment, wherein FIG. 3A is a plan view and FIG. 3B is a side view.
FIGS. 4A and 4B show a column-to-beam joint structure according to a third embodiment, where FIG. 4A is a plan view and FIG. 4B is a side view.
FIGS. 5A and 5B show a column-to-beam joint structure according to a fourth embodiment, wherein FIG. 5A is a plan view and FIG. 5B is a side view.
FIG. 6 is a diagram showing a relationship between a layer shear force and an interlayer deformation angle of a column-beam joint structure according to a fourth embodiment.
FIGS. 7A and 7B show a column-to-beam joint structure according to a fifth embodiment, wherein FIG. 7A is a plan view and FIG. 7B is a side view.
FIGS. 8A and 8B show a conventional column-beam joint structure, wherein FIG. 8A is a side view of an L-shaped joint structure and FIG. 8B is a side view of a T-shaped joint structure.
[Explanation of symbols]
1, 10, 13, 14, 16 Column-to-beam connection structure 2, 6, 20 Column main reinforcement 3 Fixing plate 4 Beam main reinforcement 5 Beam upper main reinforcement 6a Band reinforcement 7 Beam lower reinforcement 8 and 9 Column head reinforcement 15 Core reinforcement 21 Pillar 22 Stub

Claims (5)

In beam-column joints of the uppermost layer of reinforced concrete structures, the fixing plate is provided at the upper end of the column main reinforcement that is reinforcement in the beam-column joint portion, are reinforcement folded beam upper main reinforcement in Column Joints, Column A fixing plate is provided at the tip of the beam bottom main bar in the joint. The beam top main bar in the column beam joint has a U-shaped column head reinforcement facing down and its vertical part is inscribed in the band and A column-to-beam connection structure in the uppermost layer of a reinforced concrete structure, characterized in that the reinforcement is arranged in a direction perpendicular to the top end of the beam along the main reinforcement. The beam top reinforcement in the beam-column joint is arranged in a direction parallel to the beam top reinforcement with the U-shaped reinforcement at the bottom facing downward and the vertical part inscribed in the band and along the column reinforcement. joint structure of columns and beams in the uppermost layer of the reinforced concrete structure according to claim 1, characterized in that the. In fold bending reinforcement has been Beam the junction of the beam upper main reinforcement tip of columns and beams in the uppermost layer of the reinforced concrete structure according to claim 1 or 2, characterized in that the fixing plate is provided Junction structure. In the beam-column joint in the uppermost layer of the reinforced concrete structure, a fixing plate is provided at the upper end portion of the column main bar arranged in the beam-column joint, and the beam main bar is arranged through the beam-column joint. The beam upper main reinforcement in the beam-column joint has a U-shaped column head reinforcement facing down and its vertical part is inscribed in the band and along the column main reinforcement. A column-beam connection structure in the uppermost layer of a reinforced concrete structure characterized by bar arrangement in at least one direction .   5. The column-beam connection structure in the uppermost layer of the reinforced concrete structure according to claim 4, wherein a core bar is arranged in the column main reinforcement.

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