JP2003201734A - Reinforced structure of column-beam joint section of concrete building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure capable of achieving improvement of the deforming performance and the shearing strength of the column-beam joint section of a concrete building in space-saving. <P>SOLUTION: The column-beam joint section A is reinforced by a first fiber sheet 11 stuck to the outside face of the column-beam joint section A in the column-beam direction, a second fiber sheet 12 stuck so as to come into contact in the beam-axial direction, and with the inside of the column 1, at the upper face of the floor slab 4, and a third fiber sheet 13 stuck from the beam 2 to the floor slab 4 along the beam joint end so as to cross at substantially right angles with the first and the second fiber sheets 11, 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofit structure for a cross type beam-column joint facing an outer wall of a concrete building.

[0002]

2. Description of the Related Art Conventionally, as a seismic reinforcement for a beam-column joint of a concrete building, there is a method in which the joint end of the column or beam is made thick by using concrete overcast or RC steel plate. For example, as a reinforcing structure for a cross-shaped beam-column joint A of a concrete building as shown in FIG.
(B) to (D) are available. Same figure (A) ~
In (D), 1 is a pillar portion, 2 is a beam portion, 3 is an orthogonal beam, 4
Is a floor slab, and 5a and 5b are reinforcements. Same figure (B)
As shown in (D), the conventional reinforcing structure has the reinforcing portion 5 formed by the additional reinforcement of concrete or the RC steel plate at the joint end of the beam 2 (hereinafter referred to as the beam joint end) and its vicinity.
a and 5b are provided to improve the proof stress against the downward or outward bending moment applied to the beam joint end.

Further, in order to improve the proof stress against the upward bending moment applied to the beam joint end portion, the floor slab portion 4
It has also been proposed that an RC steel plate or the like be wound around the column portion 1 side of the column-beam joint portion A so as to come into contact with the upper surface portion of or the upper portion of the beam portion 2.

That is, in the conventional reinforcing structure, when the joint end portion is made to have a large diameter by overfilling concrete or the like, the plastic hinge that normally occurs at the column-beam joint portion A is the column-beam joint of the column portion 1 and the beam portion 2. It is a concept that the soundness of the beam-column joint portion A can be maintained because it occurs at a portion away from the portion A.

[0005]

Generally, a concrete building absorbs shaking caused by an earthquake or a strong wind by the deformation of the column portion 1 and the beam portion 2 and the joint portion A thereof. However, if the column-beam joint A is strongly reinforced too much, the deformability will be rather deteriorated. Therefore,
The requirement for the ideal reinforcement of the beam-column joint A is to maintain the deformation performance of the beam-column joint A while improving the shear strength.

In addition, in the existing concrete building, there are cases where the space required for reinforcement cannot be sufficiently secured within the non-residential space due to the presence of the outer wall and the lower floor ceiling in addition to the floor slab 4. In such a case, if the reinforcing structure is projected into the living space, the usability of the building and the aesthetics of the interior may be impaired. For example, in the case of FIG. 3, it is difficult due to the presence of the floor slab portion 4 to improve the proof stress against the upward bending moment of the beam joint end without impairing the usability of the building.

Further, as shown in FIG. 3, when the beam portion 2 is connected so as to be eccentric to the outside from the central axis of the column portion 1, the column-beam joint A is easily damaged outward due to an impact such as an earthquake. Therefore, it is necessary to reinforce the outer side surface portion of the beam-column joint portion A. However, when there is no sufficient gap between the pillar portion 1 and the outer wall, or when the pillar portion 1 is erected near the boundary of the site, reinforcement of the outer side surface portion of the pillar-beam joint A is not possible. It may be sufficient.

The present invention has been made in view of the above problems, and an object thereof is to prevent the deterioration of the deformation performance of the beam-column joints and to improve the shear strength in a space-saving concrete building. The purpose of the present invention is to provide a reinforcement structure for a beam-column joint.

[0009]

A reinforcing structure for a column-beam joint of a concrete building according to the present invention is a column-beam joint in which a column portion and a beam portion facing an outer wall of a concrete building are joined. A first fibrous sheet attached to the outer surface of the beam-column joint in the beam axial direction, and contacting or approaching the upper surface of the floor slab supported by the beam in the beam axial direction and to the inside of the column. And the second fiber sheet attached as described above, and from the beam portion to the floor slab portion along the joint end portion of the beam portion so as to be substantially orthogonal to the first fiber sheet and the second fiber sheet. And a third fiber sheet.

Further, the reinforcement structure for a beam-column joint portion of a concrete building according to the present invention is a beam-column joint portion in which a beam portion and a column portion facing an outer wall of a concrete building are joined. It is characterized in that it has a fourth fiber sheet attached so as to cross in an X shape on the outer side surface part of the.

Further, the reinforcement structure for a beam-column joint of a concrete building according to the present invention comprises a fifth fiber sheet wound around the beam-column joint along the beam-column joint, It is characterized in that the fourth fiber sheet wound around the column portion so as to intersect in an X shape on the outer side surface portion is fixed by the fifth fiber sheet.

According to the above configuration of the present invention, the proof stress against the outward bending moment applied to the outer side surface of the beam-column joint and the upward bending moment applied to the beam joint end is made by the fiber sheet such as the first fiber sheet. Since it is improved, the deformability of the beam-column joint is higher than the reinforcement by only concrete overfilling, and the reinforcement can be performed in a small space.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a reinforcing structure (hereinafter referred to as a reinforcing structure) of a beam-column joint portion A of a concrete building according to the present invention will be described with reference to FIGS. 1 and 2. In the text, unless otherwise specified, the description of directions and the like regarding "beams" (eg, beam axis direction, beam axis orthogonal direction, etc.) is based on "beam portion 2".

[First Embodiment] FIGS. 1A to 1C show
1 illustrates a reinforcing structure according to a first embodiment of the present invention,
In FIGS. 3A to 3C, 5 is a concrete overstrike part, 11 is a first fiber sheet, 12 is a second fiber sheet, 1
3 is a third fiber sheet. The first fiber sheet 1
The 1st, 2nd fiber sheet 12 and the 3rd fiber sheet 13 may be any fiber sheet among a carbon fiber sheet, an aramid fiber sheet, or a glass fiber sheet.

First, the beam-column joint portion A to which the reinforcing structure according to the first embodiment of the present invention is applied will be described. The beam-column joint portion A includes a beam portion 2 having a linear shape and a cross beam 3 having a semi-linear shape in the column portion 1.
And the floor slab portion 4 is fixed to the upper surface portions of the beam portion 2 and the orthogonal beam 3. In addition, the pillar portion 1 has a larger diameter than the beam portion 2 and the orthogonal beam 3, and the outer surface portion of the beam joint end portion and the pillar portion 1
A concrete overfilling portion 5 is provided at the beam joint end so that the outer side surface of the beam is flat. Here, for the sake of convenience, the additional hammering portion 5 is formed to have the same thickness and width.

In the reinforcing structure according to the first embodiment, the outer surface of the beam-column joint portion A, that is, the outer surface portion of the column portion 1 and the outer surface portion of the additional striking portion 5 provided at the beam-joint end portion are arranged in the beam axial direction. The first fiber sheet 11 is continuously attached along the first fiber sheet 11 and is substantially parallel to the first fiber sheet 11 on the upper surface portion of the floor slab portion 4 so that the first fiber sheet 11 is in contact with or close to the inside of the column portion 1. The second fiber sheet 12 having the same length is attached, and the floor slab portion 4 is formed from the outer side surface portion of the beam portion 2 along the joint end portion of the beam portion 2 so as to be substantially orthogonal to the first fiber sheet 11 and the second fiber sheet 12. The third fiber sheet 13 is attached to the upper surface of the.

The first fibrous sheet 11, the second fibrous sheet 12 and the third fibrous sheet 13 may be extended and attached more than the illustrated case. That is, the first fiber sheet 1
1 may be attached in the beam axial direction when viewed from the longitudinal direction of the orthogonal beam 3, and for example, with the outer surface portion of the beam-column joint portion A as the center, through the additional portion 5 to the outer surface portion of the beam portion 2. May be attached. Further, the third fiber sheet 13 may be attached so as to wind the beam portion 2 along the beam joint end portion, and for example, the bottom slab portion 5 from the bottom surface portion or the inner side surface portion of the beam portion 2 may be attached.
May be attached to the upper surface of the second fiber sheet 12 to the inside of the building.

The reinforcing structure according to the first embodiment is configured as described above, and the first fiber sheet 11 and the second fiber sheet 12 are used.
Respectively reinforce the outer side surface portion of the beam-column joint portion A and the joint end upper surface portion of the orthogonal beam 3, and the third fiber sheet 13 further fixes the first fiber sheet 11 and the second fiber sheet 12 while fixing the beam portion 2 of the beam portion 2. The upper surface of the joint end is reinforced.

[0019]

[Second Embodiment] FIGS. 2A and 2B illustrate a reinforcing structure according to a second embodiment of the present invention.
In (B), 14 is a 4th fiber sheet and 15 is a 5th fiber sheet. Fourth fiber sheet 14 and fifth fiber sheet 15
Is a carbon fiber sheet, similar to the first fiber sheet 11 and the like.
Any fiber sheet may be used, either an aramid fiber sheet or a glass fiber sheet.

In the reinforcing structure according to the second embodiment, the two fourth fiber sheets 14 are wound around the column portion 1 so as to intersect in the X shape at the outer surface of the column-beam joint portion A, and Junction A
The fifth fiber sheet 15 is wound around the pillar portion 1 side so as to come into contact with or approach the upper surface portion of the floor slab portion 4 or the bottom surface portion of the beam portion 2. That is, the two fourth fiber sheets 14 are provided below the column-beam joints A and from one side or the other side surface of the column 1 via the outer side surface of the column-beam joints A. It is wound in a substantially spiral shape above and to the other side or one side surface of the column 1.

The reinforcing structure according to the second embodiment is configured as described above, the outer side surface of the beam-column joint portion A is reinforced by the fourth fiber sheet 14, and the fifth fiber sheet 15 is used by the fourth fiber sheet 1.
We are trying to fix the number four.

In the second embodiment, the additional hitting portion 5 is not shown, but it may be appropriately provided if necessary.

As described above, according to the present invention, due to the peripheral structure of the beam-column joint portion A, for example, the presence of the floor slab portion 4, the outer wall, etc., a sufficient space for the reinforcement of concrete and the reinforcement of RC steel plate is secured. Even if it is not possible, it is possible to improve the proof stress against the outward bending moment applied to the outer side surface portion of the beam-column joint A and the upward bending moment applied to the beam joint end in a space-saving manner. The deformation performance of the beam-column joint can be enhanced as compared with the reinforcement by using only.

Although the embodiment of the present invention has been described above, the present invention is not limited to the first embodiment and the second embodiment, and various modifications can be made. For example, the first embodiment and the second embodiment. By using the reinforcing structure according to the second embodiment together, the shear strength of the beam-column joint portion A can be further improved. Further, the concrete overfilled portion 5 shown in the first embodiment is not necessarily a necessary component, such as when the widths of the column portion 1 and the beam portion 2 are the same.

The X-shaped crossing angle of the fourth fiber sheet 14 may be appropriately changed, or a plurality of sets of fiber sheets may be crossed in the X-shape at different angles. Further, in FIG. 2, the fourth fiber sheet in which two linear fiber sheets are spirally wound is shown, but it may be integrally formed in advance in an X shape.

Further, in the second embodiment, the case where the fourth fiber sheet 14 is wound in a substantially spiral shape in the column axis direction has been described. However, in addition to this, it is wound in a substantially spiral shape in the beam axis direction. You may make it cross | intersect in the outer surface part of the pillar-beam junction part A in X shape. That is, from the upper surface portion of the floor slab portion 4 to the bottom surface portion of the beam portion 2 via the outer side surface portion of the beam-column joint portion A,
The fiber sheet 14 may be attached.

In the first and second embodiments, the carbon fiber sheet, the aramid fiber sheet or the glass fiber sheet is used as the fiber sheet, but other materials may be used.

[0028]

As described above, according to the present invention, since the outer side surface of the beam-column joint and the upper surface of the beam-joint end are reinforced by the fiber sheet, as compared with the reinforcement of concrete and reinforcement by only RC steel plate or the like. Further, the deformation performance of the column-beam joint is high, and the shear strength can be improved in a space-saving manner.

[Brief description of drawings]

FIG. 1 (A) is a cross-sectional view of a reinforcing structure of a beam-column joint portion of a concrete building according to the first embodiment of the present invention, which is orthogonal to the column axis (cross-sectional view taken along line Y ₁ -Y _{1 of} FIG. And (B) is a front view of the same, and (C) is a cross-sectional view orthogonal to the beam axis (X ₁ -X ₁ of FIG.
It is a line sectional view).

FIG. 2A is a front view of a reinforcing structure for a beam-column joint of a concrete building according to a second embodiment of the present invention, and FIG.
The beam axis perpendicular cross-sectional view (the X ₂ -X ₂ line sectional view of FIG. (A))
Is.

FIG. 3A is a perspective view of a beam-column joint portion of a concrete building, and FIG. 3B is a cross-sectional view orthogonal to the column axis of the conventional example (Y ₂ -Y ₂ line cross-sectional view in FIG. 3C). And (C) is the same front view,
(D) is a cross-sectional view orthogonal to the beam axis (cross-sectional view taken along line X ₃ -X ₃ of FIG. 7C).

[Explanation of symbols]

A. Beam-column joint 1. Pillar 2. Beam part 3. Cross beam 4. Floor slab 11. First fiber sheet 12. Second fiber sheet 13. Third fiber sheet 14. 4th fiber sheet 15. 5th fiber sheet

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kengo Ishida             12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Arai Co., Ltd.             Within the group (72) Inventor Toshihiro Natsuki             12-20 Ikeda-cho, Nishinomiya-shi, Hyogo Arai Co., Ltd.             Within the group

Claims (3)

[Claims] 1. A column-beam joint in which a column portion and a beam portion facing the outer wall of a concrete building are joined together, and a first fiber sheet attached in the beam axial direction to an outer surface portion of the column-beam joint portion. A second fiber sheet attached to an upper surface of a floor slab supported by the beam so as to contact or be close to the inside of the column in the beam axial direction, the first fiber sheet and the second fiber A third member attached from the beam portion to the floor slab portion along the beam joint end so as to be substantially orthogonal to the sheet.
A reinforcing structure for a beam-column joint of a concrete building, which has a fiber sheet. 2. A column-beam joint in which a column and a beam facing an outer wall of a concrete building are joined together, and the first and second beams are attached so as to intersect each other in an X shape on the outer side of the column-beam joint. A reinforcing structure for a beam-column joint of a concrete building, which has four fiber sheets. 3. A fifth fiber sheet wound around the pillar portion along the pillar-beam joint portion, and wound around the pillar portion so as to cross in an X shape on an outer side surface portion of the pillar-beam joint portion. Fourth dressed
The reinforcing structure for a beam-column joint of a concrete building according to claim 2, wherein a fiber sheet is fixed by the fifth fiber sheet.