JPH0544344A - Reinforcing method for structure and structure - Google Patents

Abstract

PURPOSE:To prevent the destruction of a joint part by forming the abutting face of a reinforcing body installed on the joint part between a pillar and a beam onto a reinforced body into a curved face, and moving the position of a dynamic bearing along the curved face with the deformation due to external force of a structure. CONSTITUTION:The abutting face of a reinforcing body 3 installed on a joint part between a pillar 1 and a beam 2 onto the beam 2 is formed into a curved face having a fixed curvature. The reinforcing body 3 is then fixed to the pillar 1 through a high tension bolt or the like. In the case where a structure is deformed by external force such as earthquake or the like, a contact position between the beam 2 and the reinforcing body 3 moves to obtain a fixed contact condition. Thus the bearing force of the joint part can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method and structure for a joint between a column and a beam in a structure such as a reinforced concrete, a reinforced concrete frame or a steel frame, or other general rigid joints.

[0002]

2. Description of the Related Art Conventionally, a joint between a column and a beam in a building such as a reinforced concrete (hereinafter referred to as RC) has a sufficient proof strength against a deformation force against a structure such as a horizontal force during an earthquake. Therefore, there is a method of performing stress analysis by computer simulation. Also, recent O
In order to support A-type and intelligent building, it is necessary to design pillars, beams, and floors with high yield strength according to the equipment. For example, a vertical haunch 20 or a horizontal haunch 21 and a floor slab 22 shown in FIG.
The drop haunch 23 shown in FIG. 4 is provided to increase the resistance bending moment and the resistance shearing force at the ends of the beam and the floor.

[0003]

However, in the above-mentioned method of increasing the yield strength, when the desired yield strength cannot be obtained, the design is re-examined again, which is troublesome, and even when the haunch is formed, the pillar is simply struck. There was a drawback in that stress was prevented from concentrating on the joint between the beam and the beam, and only the weakest part against shearing force was moved toward the center of the span. Further, even if the pillars and beams after construction of the structure are strengthened, there is a drawback in that they cannot be easily constructed, the cost is high, and the construction period is long.

The present invention has been made in view of the above-mentioned problems, and a supporting body such as a column or a beam sequentially comes into contact with the curved surface of the reinforcing body as the deformation due to a shearing force or a bending moment due to an external force progresses. Providing a reinforcing method and structure that can increase the yield strength by continuously moving the position of the upper fulcrum along the curved surface of the reinforcing body and that can be easily installed even after the structure is constructed The purpose is to do.

[0005]

Means for Solving the Problems The object of the present invention to solve the above problems and achieve the above objects is to provide a contact surface of a reinforcing member that contacts a member to be reinforced constituting a structure with a predetermined curvature. The present invention relates to a method of reinforcing a structure, which is formed into a curved surface and has a desired contact condition between the reinforced body and the reinforced body when a deformation force is applied to the structure. Then, the contact surface of the reinforcing body that is to be contacted with the body to be reinforced constituting the structure as the reinforcing means is the reinforcing structure of the structure formed into a curved surface having a predetermined curvature.

More specifically, a reinforcing member having a curved surface with a predetermined curvature is provided at the joint between the column and the beam in the structure so as to come into contact with the column or the beam which is deformed by an external force. Further, as another reinforcing structure, in a space portion surrounded by columns and beams in a structure on four sides, the column or the side surface of the beam is contacted at the center between the column and beam joints, and faces the direction of the joints. That is, a wall-shaped reinforcing body having a curved surface with a predetermined curvature that is gradually separated is provided.

[0007]

According to the reinforcing method of the present invention, when an external force is applied to the structure and the columns or beams reach the design deformation, they are brought into contact with the curved surface of the reinforcing body and the mechanical fulcrums are sequentially moved. As a result, the resistance bending moment and the resistance shearing force increase to increase the proof stress of the column or beam.

Further explaining with reference to the drawings, in FIG. 1 which is conceptually explained, when the beam 2 installed between the columns 1 and 1 is deformed by the horizontal force Q, the bottom surface of the beam 2 is a reinforcing member. Three
It comes into contact with the curved surface 3a having a predetermined curvature. As shown in FIG. 2 in which a part of FIG. 1 is enlarged, a point where the bottom surface of the beam 2 contacts the curved surface 3a is set as a fulcrum A (in the case of the beam 2a in FIG. 2), and further horizontal force Q is applied. When the beam 2 is continuously deformed and reaches the fulcrum B (in the case of the beam 2b in FIG. 2), the length at the moment gradually changes from the origin O to L ₂ → L ₃ → L ₄ and gradually. It gets shorter. It should be noted that the length L ₁ of the reinforcing body 3 is appropriately changed in design depending on the condition of the reinforcing portion.

Since the length around the moment is shortened in this way, the displacement curve of the deflection δ of the beam 2 and the horizontal force Q is expressed by FIG. 3 from the horizontal force Q = 2Md / L (Md is the design moment). As shown, the length L becomes shorter for the same moment Md, and the horizontal force Q ₁ of the beam 2 becomes Q ₂ → Q.
_Increases to ₃ . This means that the horizontal force Q when the moment of the beam 2 reaches the design moment Md due to the curved surface formed by the predetermined curvature (curvature radius r) of the reinforcing body 3 is Q ₁
It means that the proof stress has increased by continuously increasing from Q ₂ to Q ₃ . Curves A and B in FIG. 3 represent displacement curves when the length L ₁ (see FIG. 2) of the reinforcing body 3 is set to the position A and the position B, respectively. Curves without reference numerals show displacement curves when the reinforcing body 3 is not provided. The case where the reinforcing body 3 is provided to the beam 2 has been described, but the same applies to the case where the reinforcing body is provided to the column 1.

Next, the wall-shaped reinforcing member 4 according to claim 4
The case in which the reinforcing member 4 is provided will be described. As shown in an example of FIG. Reinforcing body 4 in the initial state at the center point D of the span of beam 2
And the beam 2 are in contact with each other. When a horizontal force Q is applied to this, as the beam 2 deforms, it comes into contact with the curved surface 4a of the reinforcement 4 having a predetermined curvature, and the position of the fulcrum moves from the center point D to the left and right. This shortens the length around the moment and increases the resistance bending moment.

As described above, since the deformed pillars or beams are continuously brought into contact with the curved surface of the reinforcing member, the value of the horizontal force Q allowed for the structure is increased and the yield strength of the structure is increased. It will be. The method of obtaining the curvature when forming the curved surface of the reinforcing body having a predetermined curvature will be described in detail in the following embodiments.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to corresponding ones in the respective drawings. FIG. 5 is an explanatory diagram when the reinforcing method of the present invention is applied to the beam 2. Since the beam 2 in each layer of the structure is a beam pre-yield designed to yield to an external force before the column 1, the reinforcing body 3 shown in FIG.

The reinforcing body 3 is composed of an RC body 3b surrounded by a metal strip plate 3c such as an iron plate. In construction, the reinforcement body 3 is manufactured in advance at the factory and is transported to the construction site. Of course, if it can be constructed on site, it may be used. Further, the rigidity of the reinforcing body 3 is at least about the same as the rigidity of the pillar 1 or the beam 2 or higher.
For this purpose, the reinforcement 3 may be made larger or a higher rigidity material may be used. Further, the width of the reinforcing body 3 is at least the same as or larger than the width of the body to be reinforced of the pillar 1 or the beam 2. The metal strip plate 3c enhances the accuracy of the curved surface and may be omitted in some cases, and may be the RC body 3b only.

Then, the reinforcing member 3 is attached to the pillar 1 below the beam 2.
5 to 6, the lower end 2c of the beam 2 and the curved surface 3a of the reinforcing body 3 are brought into contact with each other at the fixed end F of the beam 2 and gradually separated toward the center of the span. like,
It is fixed to the column 1 by fastening means such as high tension bolts 5.
Further, in order to fix the reinforcing body 3 to the pillar 1, it may be provided at the time of constructing the structure, or may be retrofitted when reinforcement is required.

FIG. 7 is an explanatory view showing a state in which a reinforcing body 3 is provided on the pillar 1 to reinforce the pillar 1. That is, since the pillar on the first floor of the structure becomes the column-preceding yield, the reinforcement body 3 is fixed to the foundation beam 6 of the structure by the high tension bolt 5.

Now, the yield curvature φ of the curved surface 3a of the reinforcing member 3 will be determined in the embodiment shown in FIG. First, the length from the surface 1a of the pillar 1 to the reinforcing bar 7 is determined as d.
Next, as shown in FIG. 9, assuming that the strain ε when the reinforcing bars of the column 1 yield is ± εy, the yield curvature φ can be obtained as φ = 2εy / d.

Since the radius of curvature r at this time is the reciprocal of the curvature φ, it can be obtained by r = 1 / φ. Specifically, the numerical values are d = 400 mm, εy = 0.00
2, when L5 = 1000 mm, r = 1 / φ =
d / 2εy = 400 / (2 × 0.002) = 10000
It becomes 0 mm = 100 m. Also, from the fixed end L5 = 10
The separation distance δ1 from the surface 1a of the column 1 at 00 mm is δ1
= (1000/1000000) × 1000 = 10 mm.

In this way, the radius of curvature r of the curved surface 3a of the reinforcing body 3 can be obtained. Therefore, when the reinforcing body 3 is designed, the value of the strain ε of the reinforcing bar is small (abutting in the elastic deformation region). If set, the radius of curvature r becomes larger, and in some cases, the radius of curvature may be made smaller by taking a value exceeding εy (when it can be sufficiently used even after plastic deformation).

As a mode in which the reinforcing body 3 is provided on the pillar or the beam, a mode as shown in FIG. 9 is conceivable, but other than this, it can be arbitrarily changed depending on a place to be reinforced and a reinforcing condition. Further, FIG. 10 shows a part of the restoring force characteristics when the reinforcing body 3 is provided and when the reinforcing body is not provided. The curve C in the figure is when the reinforcing body is provided, and the curve E is when the reinforcing body is not provided. Shows the case.

Next, in the wall-shaped reinforcing member 4 shown in FIG.
A curved surface 4a having a predetermined curvature φ that is in contact with the side surface of the beam at the center D between the joints of the beams and is gradually separated in the direction of the joints is formed in the space surrounded by The wall-shaped reinforcing member 4 is provided, and as shown in FIG.
The pillar 1 is provided with locking tools 8, 8 ...
It only regulates the movement of the horizontal direction (arrow in the figure). The operation and the like have already been described in the section of the operation, and will be omitted.

The reinforcing method of the present invention is not limited to the above-mentioned example and can be applied to other applications. As shown in FIG. 12, for example, in a structure having a truss structure, it is fitted into the fitting hole 11 of the truss joint 9. In the connection with the truss pipe 10
As shown in FIG. 12B, a curved surface 11a having a predetermined curvature φ is formed in the fitting hole 11. Even in this case, the yield strength of the truss pipe 10 can be improved. The bottom peripheral wall 11b of the fitting hole 11 is provided with a taper (tapering) of about 1/50.

It goes without saying that the reinforcing method and structure of the present invention can be variously modified and applied within the scope of the invention.

[0023]

As described above, according to the method of reinforcing a structure of the present invention and the structure thereof, the abutting surface of the reinforcing body that abuts the body to be reinforced constituting the structure is a curved surface having a predetermined curvature. When the structure is formed and a deforming force is applied to the structure, the reinforced body and the reinforced body are brought into a desired contact condition, so that the following effects are obtained.

Curvature (or radius of curvature) of curved surface of reinforcement
Is convenient because it can be arbitrarily set according to the degree to be reinforced, and the structure can be reinforced at any place, and the degree of reinforcement can be adjusted to appropriate conditions by changing the curvature. It can be set, and the design efficiency of the structure is improved without changing the reinforcing bars and steel materials.

The reinforcing body of the present invention can be retrofitted to any place, and the reinforcing work, which could not be done easily in the past, can be made extremely easy and the cost can be reduced, and the structure suitable for OA and intelligent in recent years can be obtained. Can be According to the reinforcing method and structure of the present invention, the energy of the horizontal force due to the external force applied to the structure is dispersed by the stress concentration points moving along the curved surface, and the destruction of the joint portion of the column or the beam is prevented. ..

Further, if the wall-shaped reinforcing member is used, the wall-shaped reinforcing member can be easily inserted into the space surrounded by the pillar and the beam, so that the pillar and the beam can be reinforced at the same time. The reinforcing structure can be easily constructed at a cost. In this case, it is free to design the curved surface of the wall-shaped reinforcing body having a predetermined curvature over the entire circumference of the peripheral wall of the reinforcing body or a part of the peripheral wall. It is convenient.

[Brief description of drawings]

1A and 1B are explanatory views showing a reinforcing method according to the present invention.

FIG. 2 is an enlarged explanatory diagram in which a part of FIG. 1 is enlarged.

FIG. 3 is an explanatory diagram of a characteristic curve showing a relationship between bending of a beam and horizontal force.

FIG. 4 is an explanatory diagram showing a reinforcing method using a wall-shaped reinforcing body.

FIG. 5 is a front view showing an example in which the reinforcing method of the present invention is carried out.

FIG. 6A is a front view of the reinforcing body, and FIG. 6B is a perspective view of the reinforcing body.

FIG. 7 is a front view showing an example in which a reinforcing body is applied to a column.

FIG. 8 is an explanatory diagram showing a distortion curve.

9A and 9B are explanatory views showing an example in which a reinforcing body is applied to each place.

FIG. 10 is an explanatory diagram showing restoring force characteristics of horizontal force and beam deformation amount.

FIG. 11 is a plan view showing a structure for supporting a wall-shaped reinforcing body.

FIG. 12A is an explanatory view showing another example to which the reinforcing method of the present invention is applied, and FIG. 12B is an explanatory view in which a part thereof is similarly enlarged.

FIG. 13 is an explanatory diagram showing an example of reinforcement according to a conventional example.

FIG. 14 is an explanatory view showing a reinforcing structure according to the conventional example.

[Explanation of symbols]

1 pillar, 2 beams, 3 reinforcements, 4 wall-shaped reinforcements, 5
Fastening means such as high tension bolts, 6 foundation beams, 7 reinforcing bars.

Claims (4)

[Claims] 1. An abutting surface of a reinforcing body that comes into contact with a body to be reinforced constituting a structure is formed into a curved surface having a predetermined curvature, and the body to be reinforced when a deforming force is applied to the structure. A method of reinforcing a structure, characterized in that a reinforcing body is set to have a desired contact condition. 2. A reinforcing structure for a structure, wherein an abutting surface of the reinforcing body which is to be abutted on the body to be reinforced constituting the structure as a reinforcing means is formed into a curved surface having a predetermined curvature. 3. A reinforcing structure for a structure, characterized in that a reinforcing body having a curved surface with a predetermined curvature is formed at a joint portion between the column and the beam so as to come into contact with the column or the beam deformed by an external force. 4. A predetermined space that is in contact with a side surface of the pillar or the beam at the center between the joint portions of the pillar and the beam, and is gradually separated in the direction of the joint portion in a space surrounded by the pillar and the beam on all sides. A reinforcing structure for a structure, characterized in that a wall-shaped reinforcing body having a curved surface is provided.