JP3842587B2 - Reinforcing method and reinforcing structure of reinforced concrete ramen structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing method for a reinforced concrete type ramen structure for enhancing the seismic resistance and load carrying capacity of the reinforced concrete type ramen structure, and a reinforcing structure for improving the seismic resistance and the load carrying capacity of the reinforced concrete type ramen structure. .
[0002]
[Prior art and problems to be solved by the invention]
As a means of reinforcing the existing reinforced concrete type ramen structure to ensure the earthquake resistance and load carrying capacity, there is a means to reinforce the ramen structure with seismic walls and braces, which are used as commercial stores and office buildings. Reinforcement of existing reinforced concrete buildings requires maintaining as much space as possible for their intended purpose, so such measures are at least more than do not impair the intended purpose of the existing building. Cannot be used.
[0003]
Therefore, reinforcement is often performed by winding a steel plate from the column base to the column head of the column, filling and solidifying the mortar in the gap between the steel plate and the column, and winding and fixing a high-tensile fiber reinforced sheet around the column. . However, such a reinforcement method is convenient for maintaining space, but it cannot necessarily increase the bending strength and shear strength of at least a part of the column head. Cannot be improved sufficiently.
[0004]
The present invention has been made in view of the above-described problems existing in the prior art, and the object of the present invention is a beam and both columns constituting the ramen structure of the original reinforced concrete ramen structure. Reinforcement method of reinforced concrete ramen structure that can suppress deformation by improving the yield strength of the entire ramen structure while maintaining the enclosed space as much as possible, and earthquake resistance and loading resistance of reinforced concrete ramen structure An object of the present invention is to provide a reinforcing structure that improves loadability and the like.
[0005]
[Means for Solving the Problems]
The reinforcing structure of the present invention that achieves the above object is as follows.
It is a reinforcement structure of a reinforced concrete ramen structure,
Abdominal material is arranged on the side of the beam constituting the ramen structure, and the lower chord material is arranged on the lower side of the abdominal material,
Both ends of the lower chord material are tightly coupled to the column heads of the columns that are rigidly joined to both ends of the beam and constitute the ramen structure,
When the lower chord material is joined to the lower chord material, the lower chord material constitutes one or two or more substantially triangular shape planes constituting the lower side portion, and each substantially triangular shape structure is formed. The upper part of the abdominal material constituting the surface is tied to the beam ,
A new beam composed of the beam as the upper chord material, the belly material and the lower chord material is formed .
[0006]
Further, the reinforcing method of the present invention includes:
A method for reinforcing a reinforced concrete ramen structure,
Arrange the abdomen on the side of the beam constituting the ramen structure,
Arrange the lower chord material under the belly,
The column ends of the columns that are rigidly joined to both ends of the beam and constitute the ramen structure are respectively fastened to both ends of the lower chord material,
By joining the lower part to the lower chord material, the abdomen constitutes one or two or more substantially triangular composition surfaces that form the lower side portion of the lower chord material, and each substantially triangular composition surface. The upper part of the abdominal material that constitutes the material is tightly coupled to the beam, thereby forming a new beam composed of the beam as the upper chord material, and the abdomen and the lower chord material .
[0007]
According to this reinforcing structure or reinforcing method, a new beam composed of the upper chord material, the abdomen and the lower chord material is formed using the beam constituting the original frame structure as the upper chord material, and the bending strength and shear strength are improved. Further, since the original beam retains the original bending strength and shear strength, it also has an effect as a composite beam of both.
[0008]
Furthermore, since both ends of the lower chord material are tightly coupled to the column heads of both columns constituting the original ramen structure, the bending strength near the column heads of those columns is improved, and as a result, the shear strength is also improved. .
[0009]
Therefore, in the original column, the bending strength and shear strength near the column head are reduced as in the case where the bending strength and shear strength near the column head are lower than the bending strength and shear strength of the portion below the column head. When the bending strength and shear strength of the entire column can be increased by increasing the strength, the overall bending strength and shear strength of both the column and beam are improved by this reinforcing structure or reinforcing method, and the overall rigidity is increased. Increases and deformation is suppressed. Therefore, while maintaining the space surrounded by the original beam and both pillars as much as possible, the yield strength of the entire ramen structure can be improved and its deformation can be suppressed.
[0010]
Of course, in the reinforcing structure of the present invention, abdomen is arranged on both sides of the beam, and each abdomen arranged on both sides of the beam has its lower part joined to the lower chord material. 1 constitutes the lower side or two or more substantially triangular construction surfaces arranged in a row, and the upper part of the abdominal material constituting each substantially triangular construction surface is tightly coupled to the beam. It is desirable. In the reinforcing method of the present invention, the abdomen is arranged on both sides of the beam, and each abdomen arranged on both sides of the beam is joined to the lower chord material at the lower portion thereof, so that the lower chord material is It is desirable that one or two or more substantially triangular construction surfaces constituting the lower side portion are constructed, and the upper portion of the abdominal material constituting each substantially triangular construction surface is fastened to the beam. .
[0011]
By arranging the abdomen on both sides of the original beam in this way, highly effective reinforcement is performed in a balanced manner while maintaining the space surrounded by the original beam and both pillars as much as possible.
[0012]
Furthermore, in the reinforcing structure of the present invention, the lower chord material is disposed on both sides of the lower position of the beam, and the abdomen is disposed on both sides of the beam, and both ends of the lower chord material are Each of the abdominal materials that are tightly coupled to the column heads of the columns and arranged on both sides of the beam are joined to the lower chord material at the lower portion thereof, so that the lower chord material forms one or more columns constituting the lower side portion It is desirable that two or more substantially triangular construction surfaces are formed, and the upper part of the abdominal material constituting each substantially triangular construction surface is tightly coupled to the beam. In the reinforcing method of the present invention, the lower chord material is disposed on both sides of the lower position of the beam, the abdomen is disposed on both sides of the beam, and both ends of the lower chord material are connected to the pillars. Each abdomen that is tightly coupled to the column head and arranged on both sides of the beam is joined to the lower chord member at the lower portion, so that the lower chord member constitutes the lower side portion, or two or more in series It is desirable that a substantially triangular shape is formed, and that an upper portion of the abdomen constituting each substantially triangular shape is bonded to the beam.
[0013]
In this way, the lower chord material and the abdomen are arranged on both sides of the original beam, so that the space surrounded by the original beam and both pillars is maintained as much as possible, and a highly effective reinforcement with good balance is performed.
[0014]
The reinforced concrete system includes reinforced concrete, steel reinforced concrete, prestressed concrete, and the like.
[0015]
In such a reinforcing structure of the present invention, both or one of the two columns which are rigidly joined to both ends of the beam and constitute the above-described frame structure are at least a part of the column head, or at least each of the column head and the column base. Except for a part, bending strength and / or shear strength (one or both of bending strength and shear strength) can be reinforced. Further, the reinforcing method of the present invention is such that at least a part of the column head or at least one of the column head and the column base is provided for both or one of the two columns that are rigidly joined to both ends of the beam to constitute the above-mentioned rigid frame structure. Excluding the portion, it may include reinforcing the bending strength and / or shear strength.
[0016]
In this case, in the original column, the bending strength and shear strength in the vicinity of the column head are lower than the bending strength and shear strength in the portion below the column head, and the bending strength and shear strength in the vicinity of the column head are increased. The bending strength and shear strength of the column as a whole can be increased. Therefore, this reinforcing structure improves the overall bending strength and shear strength of both the columns and beams, increases the overall rigidity and suppresses deformation, and allows the space surrounded by the original beams and both columns. While maintaining as much as possible, the proof stress of the whole ramen structure can be improved and the deformation | transformation can be suppressed.
[0017]
Such column reinforcement can be performed, for example, by winding a steel plate from the column base to the column head and filling and solidifying a non-shrink mortar in the gap between the steel plate (steel pipe) and the column. Of course, it is also possible to utilize known reinforcing means.
[0018]
As the lower chord material, for example, a shape steel such as a grooved steel or an H-shaped steel as a structural steel material can be reinforced as necessary, but the invention is not limited thereto. In addition, the lower chord material is not limited to a linear shape, and may be, for example, an upwardly arched shape, a trapezoidal shape (a shape of three sides excluding the bottom side), or a triangular shape (a shape of two sides excluding the bottom side). It can also be.
[0019]
Tightening of the end of the lower chord member to the column head of the column can be performed directly or via another member, and may be in a rigid connection state or a pin connection state, for example. The lower chord material can be positioned, for example, at the lower position of the beam or at the side of the lower position of the beam, and all or part of the portion excluding the end portion of the lower chord material tightly coupled to the column head is on the beam side. It can also be located in the direction.
[0020]
It is desired that the end of the lower chord member is tightly coupled to the column head of the column so that the force acting on the lower chord member flows smoothly to the column. For example, when a column is reinforced by winding a steel plate as described above, a saddle-shaped reinforcing material made of a pair of upper and lower annular steel plates is provided at the column head, and the end of the lower chord material is joined to the saddle-shaped reinforcing material. Thus, the force acting on the lower chord material can smoothly flow through the steel plate integrated with the column. As for the lower chord material, as a means for preventing buckling as necessary, for example, an appropriate portion thereof is tightly coupled to the beam, or when the lower chord material is provided on both sides of the beam, the lower chord material is tightly coupled at an appropriate location. can do.
[0021]
As the abdomen, for example, a shape steel or a steel plate such as a grooved steel or an H-shaped steel as a structural steel material can be reinforced as necessary, but the invention is not limited thereto.
[0022]
The lower part of the abdomen is joined to the lower chord member so that the lower chord member constitutes one lower part constituting the lower side part or two or more substantially triangular structures arranged in the direction of the material axis of the beam. For example, when using a shape steel (or other elongated material) as the abdominal material, the other two sides of the triangular construction surface with the lower chord material as the lower side portion can be made of the shape steel. The lower ends of the section steels constituting the two sides are respectively joined to the lower chord material. For example, when a steel plate (or other plate-like material) is used as the abdomen, a rib-like portion is formed on the peripheral portion of the triangular steel plate, and one side of the steel plate is joined to the lower chord material by welding or the like. The substantially triangular shape is formed.
[0023]
The upper part (for example, the vicinity of the top part) of the abdominal material constituting each substantially triangular shape is tightly connected to the beam. This tightening can be performed directly or through other members such as a floor slab supported on the beam or a member in the axial direction of the beam joined to the side surface of the beam. It may be in the state of pin bonding. The upper part of the abdominal material constituting each substantially triangular surface is preferably fastened to the upper or lower middle part of the beam or above, and more preferably to the upper part of the beam.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 to FIG. 3 relate to a reinforced concrete multi-layered ramen structure as an example of an embodiment of the present invention, and FIG. 1 is an explanatory view of a part of the reinforced concrete multi-layered ramen structure, 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III in FIG. In addition, as above-mentioned, this invention is applicable also to reinforcement of reinforced concrete type | system | group ramen structures other than reinforced concrete, such as steel frame reinforced concrete and prestressed concrete.
[0026]
As shown in FIG. 1, a beam 10 and columns 12 rigidly joined to both ends of the beam 10 constitute a reinforced concrete frame structure, and a reinforced concrete floor slab 14 is supported on the beam 10. Has been. Further, a beam 16 and a small beam 18 orthogonal to the beam 10 are provided. The lower layer slab 20 is located on the column base of the column 12.
[0027]
The column 12 is covered with a steel pipe 22 from the column base portion to the column head of the original column 13 made of reinforced concrete, and the gap between the steel tube 22 and the original column 13 is filled and solidified with a non-shrink mortar 24 to be integrated. It is reinforced by doing. The steel pipe 22 is formed by winding a steel plate having a semicircular arc cross section divided into two vertically around the original column 13 and joining both steel plates by welding or fasteners (bolts and nuts).
[0028]
A columnar head portion of the column 12 is provided with a flange-shaped reinforcing portion 28 composed of a pair of upper and lower annular steel plate portions 26. The annular steel plate portion 26 constituting the flange-shaped reinforcing portion 28 has two arc-shaped steel plates each having a shape obtained by dividing the annular plate into two steel plates having a semicircular arc cross section constituting the steel pipe 22 in advance. In addition, both the steel plates are joined as described above, and the edge portions of the arc-shaped steel plates are welded to each other, so that the flange-shaped reinforcing portion 28 is formed on the column head.
[0029]
On both sides of the lower position of the beam 10, lower chord members 30 made of H-shaped steel are arranged in parallel with the beam 10, and both end portions of each lower chord member 30 are a pair of upper and lower annular steel plate portions in the flange-shaped reinforcing portion 28. 26 and the steel pipe 22 are joined to a rectangular reinforcing plate 32 having three sides welded thereto using bolts and nuts.
[0030]
The abdomen 34 disposed on the side of the beam 10 is joined to the lower chord member 30 at the lower portion thereof, so that the lower chord member 30 forms two isosceles triangle-shaped construction surfaces (triangular construction). It is sufficient if it is a plane, and it is not required to be an isosceles triangle.). These isosceles triangular shaped surfaces are arranged in the direction of the material axis of the beam 10 across the position of the small beam 18, and the upper part of the abdomen 34 constituting each isosceles triangular shaped surface is a joining member. It is joined to the upper part of the beam 10 through 36.
[0031]
The abdomen 34 constituting each isosceles triangular composition surface is made of H-shaped steel and has an isosceles shape inclined along the side surface of the beam 10 with respect to the material axis direction of the beam 10. The lower and upper portions of each abdomen 34 are welded to the lower chord member 30 and the joining member 36, respectively.
[0032]
The H-shaped steel constituting the lower chord member 30 is reinforced by welding both flange portions and a rib plate 38 across the web on both sides of the web at several locations centering on the welded portion of the web 34. As shown in FIG. 2, the rib plates 38 to which the lower chord members 30 are welded to the opposite inner sides project inward at the corresponding positions, and the rib plates 38 project inward from the lower chord members 30. Are coupled by the grooved steel 40 to prevent buckling of the lower chord members 30 and the like.
[0033]
As shown in FIG. 3, the joining member 36 is formed by welding plate-shaped steel materials to the side ends of both flange portions of one side of the H-section steel, and is arranged in the material axial direction at the upper portions on both sides of the beam 10. The joining members 36 on both sides are joined to the upper part of the beam 10 using bolts 42 penetrating the beam 10. In the joining member 36, a bolt insertion hole 44 is provided in a web at a position where fastening with bolts and nuts is performed. Further, the joining member 36 is reinforced by welding a rib plate 46 across both the flange portions and the web to the welded portion of the web 34. The upper part of the abdomen 34 and such a joining member 36 are joined to the floor slab 14 supported on the beam 10 on both sides of the beam 10 in addition to joining to the beam 10 itself. Tightening can also be achieved via the slab 14.
[0034]
As described above, the column 12 is formed by reinforcing the original column 13 made of reinforced concrete with the steel pipe 22 and the mortar 24. However, only with this reinforcement, the column 12 near the boundary with the lower surface of the beam 10 is used. Bending strength and shear strength are not improved.
[0035]
However, a new beam 10 composed of the upper chord material, the abdomen 34 and the lower chord material 30 is formed using the beam 10 constituting the original frame structure as the upper chord material, and the bending strength and the shear strength are improved. Moreover, since the original beam 10 retains the original bending strength and shear strength, it also has an effect as a composite beam 10 of both. Furthermore, since both ends of the lower chord member 30 are tightly coupled to the column heads of both columns 12 constituting the original ramen structure, the bending strength in the vicinity of the column heads of these columns 12 is improved, and as a result, the shear strength Will also improve.
[0036]
Therefore, both the column 12 and the beam 10 are improved in overall bending strength and shear strength, and the overall rigidity is increased and deformation is suppressed. Therefore, since the lower chord member 30 is located on the side of the lower position of the original beam 10, the space below it is slightly lowered, but the space surrounded by the original beam 10 and both pillars 12 is made as much as possible. While maintaining, the proof stress of the whole ramen structure can be improved and the deformation | transformation can be suppressed.
[0037]
It should be noted that the number of components, material, shape, relative arrangement, and the like in the description of the above embodiments limit the scope of the present invention only to the extent that there is no specific limitation. It is not intended but merely an illustrative example. In addition, the description including the exemplification and the numerical range described in the section of the means for solving the problem is applied to the description of the above embodiment in principle.
[0038]
【The invention's effect】
According to the reinforcing structure or the reinforcing method of the present invention, while maintaining as much as possible the space surrounded by the beams and both pillars constituting the original ramen structure, the yield strength of the entire ramen structure is improved and the deformation is improved. Can be suppressed. Therefore, it is optimal for improving the seismic resistance and load carrying capacity of existing reinforced concrete buildings used as commercial stores while maintaining as much space as possible for the purpose of use.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a part of a reinforced concrete multi-layered rigid frame structure.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is an enlarged sectional view taken along line III-III in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Beam 12 Column 13 Original column 14 Floor slab 16 Beam 18 Small beam 20 Lower layer slab 22 Steel pipe 24 Mortar 26 Annular steel plate part 28 Reinforcement part 30 Lower chord material 32 Reinforcement plate 34 Abdomen 36 Member for joining 38 Rib plate 40 Groove Shape steel 42 Bolt 44 Bolt insertion hole 46 Rib plate

Claims (6)

It is a reinforcement structure of a reinforced concrete ramen structure,
Abdominal material is arranged on the side of the beam constituting the ramen structure, and the lower chord material is arranged on the lower side of the abdominal material,
Both ends of the lower chord material are tightly coupled to the column heads of the columns that are rigidly joined to both ends of the beam and constitute the ramen structure,
When the lower chord material is joined to the lower chord material, the lower chord material constitutes one or two or more substantially triangular shape planes constituting the lower side portion, and each substantially triangular shape structure is formed. The upper part of the abdominal material constituting the surface is tied to the beam ,
A reinforcing structure in which a new beam composed of the beam as an upper chord member, and the abdomen and the lower chord member is formed . Both or one of the two columns which are rigidly joined to both ends of the beam and constitute the frame structure, except for at least a part of the column head or at least a part of the column head and the column base, The reinforcing structure according to claim 1, wherein the shear strength is reinforced. The lower chord material is arranged on both sides of the lower position of the beam, and the belly material is arranged on both sides of the beam,
Both ends of each lower chord material are respectively tightly coupled to the column heads of the columns,
Each of the abdominal members arranged on both sides of the beam has a lower portion joined to the lower chord member, so that the lower chord member constitutes a lower side portion, or two or more substantially triangular structures arranged in a row. The reinforcing structure according to claim 1 or 2, wherein an upper portion of the abdominal material constituting the surface and constituting each substantially triangular shape construction surface is fastened to the beam. A method for reinforcing a reinforced concrete ramen structure,
Arrange the abdomen on the side of the beam constituting the ramen structure,
Arrange the lower chord material under the belly,
The column ends of the columns that are rigidly joined to both ends of the beam and constitute the ramen structure are respectively fastened to both ends of the lower chord material,
By joining the lower part to the lower chord material, the abdomen constitutes one or two or more substantially triangular composition surfaces that form the lower side portion of the lower chord material, and each substantially triangular composition surface. The upper part in the abdominal material which comprises is bonded to the said beam, The new beam which consists of the said beam as an upper chord material, and the said abdominal material and the said lower chord material is formed . With respect to both or one of both columns that are rigidly joined to both ends of the beam and constitute the frame structure, bending strength and at least a part of the column head or at least a part of each of the column head and the column base are excluded. 5. The reinforcing method according to claim 4, comprising reinforcing the shear strength. Arrange the lower chord material on both sides of the lower position of the beam, and arrange the belly material on each side of the beam,
Tighten both ends of each lower chord material to the column heads of the columns,
Each of the abdominal members arranged on both sides of the beam is joined to the lower chord member at the lower part, so that the lower chord member constitutes the lower side portion, or two or more substantially triangular triangular planes. The reinforcing method according to claim 4 or 5, wherein an upper portion of the abdominal material constituting each substantially triangular surface is fastened to the beam.

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