JPH07100978B2 - Reinforcement method of structure and its structure - Google Patents

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 steel reinforced concrete, a steel frame or the like, or other general rigid body joints with respect to proof strength and rigidity.

[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 columns, beams, and floors with high yield strength according to the equipment. For this purpose, for example, a vertical haunch 20 or a horizontal haunch 21 having a large size as 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 pillars are simply used. 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, beams, etc. after the construction of the structure are strengthened, there is a drawback in that they cannot be easily constructed and the cost is increased and the construction period is extended.

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 progresses due to a shearing force or a bending moment caused by an external force, and Providing a reinforcing method and structure that can increase the yield strength by moving the position of the upper fulcrum continuously along the curved surface of the reinforcing body and that can be easily constructed even after the structure is constructed. The purpose is to do.

The gist of the present invention to solve the above problems and achieve the above object is to provide a structure to be reinforced as
It contacts the fixed end of the body to be reinforced and
Of an arbitrary radius of curvature that is gradually separated toward the center of the body to be reinforced.
It exists in the method of reinforcing a structure with a reinforcing body having a curved surface.
It And, the curved surface of the reinforcing body is the outermost edge of the body to be reinforced.
Select within the range of curvature at yield strength and curvature at maximum yield strength.
It is formed by a radius of curvature with an arbitrary curvature.

More specifically, at the joint between the column and the beam in the structure, there is a column or beam that is deformed by an external force .
It abuts the fixed end, and the pillar
Is to provide a reinforcing body having a curved surface with an arbitrary radius of curvature that is gradually separated toward the center of the beam . In addition, as another reinforcing structure, in the space surrounded by columns and beams in the structure on all sides, the pillar or the side surface of the beam is contacted at the center between the joints of the pillars and the beams, and faces the direction of the joints. That is, a wall-shaped reinforcing body having a curved surface with an arbitrary radius of 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 column or beam reaches the design deformation, the reinforcing member is brought into contact with the curved surface of the reinforcing member to sequentially move the mechanical fulcrum. 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 body. Three
It comes into contact with the curved surface 3a having a predetermined curvature. As shown in FIG. 2 which is an enlarged view of a part of FIG. 1, a point where the bottom surface of the beam 2 contacts the curved surface 3a is defined 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 point B (in the case of the beam 2b in FIG. 2), the length at the moment is gradually changed 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 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 . That is, 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 (radius of curvature r) of the reinforcing body 3 is Q ₁
Continuously increase to Q _2, Q ₃ from the strength is to say that increased. 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 in FIG. 4, the reinforcing body 4 is attached to the structure designed for the beam preceding yield. Reinforcement 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 is deformed, it comes into contact with the curved surface 4a having a predetermined curvature of the reinforcing body 4, and the position of the fulcrum moves from the central 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 reinforcement 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 attached to the corresponding reference numerals 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. 6 is provided at the joint portion of the beam 2.

The reinforcing body 3 is a body 3b of RC 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 reinforcement 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 a column-preceding yield, the reinforcing body 3 is fixed to the foundation beam 6 of the structure with the high tension bolt 5.

Now, the yield curvature φ of the curved surface 3a of the reinforcing body 3 will be determined in the embodiment shown in FIG. First, the length between the surface 1a of the pillar 1 and 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
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, so that in designing the reinforcing body 3, 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 will be further increased. In some cases, the radius of curvature r may be reduced by taking a value exceeding εy (when it can be sufficiently used even after plastic deformation). Therefore, the radius of curvature r is
(For example, the curvature of the outermost edge yield strength of the column 1)
Yield curvature φ and maximum when fracture occurs after plastic deformation
Selectable by the designer within the range of the curvature at proof stress
It is set as the reciprocal of any curvature.

As a mode in which the reinforcing body 3 is provided on the pillar or the beam, a mode as shown in FIG. 9 can be considered, but 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.
In the space surrounded by the beam 2 and the beam 2, a curved surface 4a having a predetermined curvature φ is formed which is in contact with the side surface of the beam at the center D between the beam joints and is gradually separated in the direction of the beam joints. 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 actions and the like have already been described in the action column, and therefore will not be described.

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 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.

Needless to say, 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 curved surface of the reinforcing body that abuts the body to be reinforced constituting the structure contacts the fixed end of the body to be reinforced. Touch
Together with the fixed end gradually toward the central portion of the body to be reinforced
It is formed on a curved surface having an arbitrary radius of curvature to be separated from each other, and when the deforming force is applied to the structure, the body to be reinforced and the body to be reinforced are desired.
Since the reinforcement condition is set, 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 location, 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. 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 disperses by moving the stress concentration points along the curved surface and preventing the joint portion of the column or beam from being broken. .

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.

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 a restoring force characteristic of a horizontal force and a deformation amount of a beam.

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

FIG. 12 (A) is an explanatory view showing another example to which the reinforcing method of the present invention is applied, and FIG. 12 (B) 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 rebars.

Claims (4)

[Claims] 1. A structure to be reinforced, which is to be reinforced
It abuts against the fixed end of the body and from the fixed end
A curved surface with an arbitrary radius of curvature gradually separating toward the center of the strong body
A method for reinforcing a structure, characterized in that a reinforcing body having the same is provided . 2. The curved surface of the reinforcing body is the outermost edge yield of the body to be reinforced.
Selected within the range of the curvature at proof stress and the curvature at maximum proof stress
It is characterized by being formed with a radius of curvature with an arbitrary curvature
The method for reinforcing a structure according to claim 1, wherein 3. A fixed end of a pillar or a beam , which is deformed by an external force, abuts on a joint between the pillar and the beam , and
Gradually separate from the fixed end toward the center of the pillar or beam
A reinforcing structure for a structure, comprising a reinforcing body having a curved surface with an arbitrary radius of curvature. 4. An arbitrary portion which 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 . Song
A reinforcing structure for a structure, characterized in that a wall-shaped reinforcing member having a curved surface with a radius of curvature is provided.