JPH11229632A - Damping reinforcing method for outer shell of existting building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and earthquake resistance by installing part of a steel column having a vibration damping equipment and whole or part of a steel beam at outer sides of an existing column or beam. SOLUTION: Along an existing column 1 and an existing beam 2 of an outer shell frame of an existing beam 2, a leg and a head of a steel column 3 and whole or part of a steel beam 4 are attached in one united body at the outer side of the column and beam of an outer shell frame of reinforced concrete building or the like. Next, the cross sectional areas of the column 3 and the beam 4 are made smaller than those of the existing column 1 and beam 2. Also, the column 3 is attached to both the sides of the column 1, and a normal steel plate 5 and a very low yield point steel plate 6 are built in between the columns 3. During earthquake, the steel 6 is yielded before the steel 5, and horizontal deformation (interlayer deformed angle) is concentrated in steel 6 after the yielding. In this case, the steel 5 is in the elastic range so that the deformation is concentrated in the steel 6 and a large deformation occurs locally, thereby earthquake energy absorbing effect is enhanced, and a bending moment caused by a shearing force borne by the column 3 is borne by a beam 4. In this way, a high vibration damping effect can be secured and the work can be carried out while the occupants are living within the building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of a technique of reinforcing a vibration with a reinforcing member which is provided outside a shell frame of an existing building, and more specifically, a reinforced concrete structure (hereinafter abbreviated as RC). Alternatively, the present invention relates to a method of reinforcing a seismic control reinforced concrete building (hereinafter, abbreviated as SRC) "in a living state" without impairing the livability of an existing building.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing an existing building, a method of wall installation and additional reinforcement is used. How to reinforce with steel braces. A method of reinforcing an earthquake-resistant wall with a steel plate is used as a general method and means. On the other hand, embodiments of the reinforcing method are roughly classified into a method of reinforcing the outer peripheral portion (outer shell) of the existing building and a method of reinforcing the inside of the existing building. The former has a drawback that it blocks the opening of the building and deteriorates the livability. The latter not only reduces the working space and living space in the building, but also reduces the noise when installing the formwork during the construction, placing the concrete, and then installing the construction anchor. "
There is a disadvantage that it cannot be reinforced.

[0003] Next, as a method of seismic reinforcement of the outer shell frame of an existing building, a method of additionally striking columns and beams with cast-in-place concrete, a method of attaching a precast concrete member (hereinafter referred to as a Pca member), a steel frame member. There is a method of attaching and reinforcing. However, the above method requires a long construction period. In the above method, the weight of the Pca member is huge and the workability is poor. According to the above-mentioned method, if the existing building is RC or SRC, the rigidity of the existing column-beam frame is high, so it is inevitable to use a brace and a steel plate-based reinforcement structure. There is a disadvantage that the properties are deteriorated.

Conventionally, Japanese Patent Application Laid-Open No. Hei 8-218680 discloses
In the official gazette, the steel columns that constitute the outer shell of the existing high-rise building are seismic columns, and auxiliary steel columns are built outside the columns, and the seismic columns and the auxiliary steel columns are made of low yield point steel such as aluminum. There is disclosed a seismic control reinforcement method that is connected in a substantially horizontal direction with a damper member to suppress shaking of an elongated high-rise building to improve comfort and seismic safety.

Japanese Patent Application Laid-Open No. Hei 9-235892 discloses that a new construction surface is constructed on all or a part of the outer shell of an existing building, and a seismic element such as a brace or a wall or a vibration control device is provided on the construction surface. In addition, a method for reinforcing a vibration control in which a new outer wall is provided is disclosed.

[0006]

[PROBLEMS TO BE SOLVED BY THE INVENTION] The vibration control reinforcement is an efficient reinforcement method in terms of absorbing seismic energy entering an existing building, suppressing the shaking of the building, and reducing the shearing force that the existing building bears. It is. In particular, steel-frame-based seismic control reinforcement is carried out using steel braces and reinforcement with an energy absorption mechanism. However, the conventional method of reinforcing the vibration control described in the above (1) has a problem that, in addition to blocking the opening of the existing building and deteriorating the livability, it is often difficult to perform the vibration control reinforcement work "while staying".

Accordingly, an object of the present invention is to provide an RC structure and an SR structure.
Regarding the existing C building, without impairing the livability
An object of the present invention is to provide a method for seismic control and reinforcement of an existing building shell which can be constructed "as is" and has excellent workability. A different object of the present invention is to provide the outer shells of existing RC and SRC buildings,
Reinforcement with a relatively lightweight and easy-to-install steel frame reinforcement, and a seismic control device made of extremely low yield point steel built into the steel column part of the reinforcement, effectively concentrating the interlayer deformation angle in this part to effectively conduct earthquakes It is an object of the present invention to provide a method of strengthening the vibration of existing building shells to absorb energy.

[0008] A further object of the present invention is to provide reinforcement for attaching steel beams and columns to pillars and beams of the existing building shell, without blocking the opening of the building, etc.
An object of the present invention is to provide a seismic control reinforcement method that does not reduce the living space.

[0009]

According to a first aspect of the present invention, there is provided a method for damping and reinforcing a shell of an existing building according to the present invention. In the method of seismic reinforcement with a reinforcing body, part of the steel column and all or part of the steel beam outside the existing columns and beams that constitute the outer shell frame of the reinforced concrete or steel reinforced concrete existing building Are mounted so as to be integrated, and a vibration damping device is incorporated in the steel column.

According to a second aspect of the present invention, in the method for damping and reinforcing a shell of an existing building according to the first aspect, the cross sections of the steel beam and the steel column have an existing column and an existing column constituting a shell frame of the existing building. It is characterized by being smaller than the cross section of the beam. According to a third aspect of the present invention, in the method for damping reinforcement of an existing building shell according to the first or second aspect, the steel column is a composite of a normal steel portion and an extremely low yield point steel portion serving as a damping element. It is characterized by being constituted as a body.

According to a fourth aspect of the present invention, there is provided a method of damping and reinforcing a shell of an existing building according to the first or second or third aspect,
The steel columns are the existing pillars 1 that constitute the shell frame of the existing building.
At least two pieces are attached in parallel along the same column per book, and are configured as a composite of a part incorporating ordinary steel material between the two columns and a part incorporating an extremely low yield point steel material serving as a vibration damping element. It is characterized by doing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for seismic retrofit of an existing building shell according to the first to fourth aspects of the present invention is a method of reinforcing a seismic control with a steel frame reinforcement added to the outside of a shell frame of an existing building. The target is an existing reinforced concrete building or a steel-framed reinforced concrete building. 1A and 1B
As shown in the example, a part of the reinforcing steel column 3 (column base, column head) and the steel beam 4 are provided along the existing column 1 and the existing beam 2 constituting the outer shell frame of the existing building and outside thereof. Is attached and attached so as to integrate the whole or a part thereof. And it is implemented in the form which incorporated the vibration control device in the said steel column 3 for reinforcement.

In this case, according to the present invention, the cross section of the steel column 3 and the steel beam 4 as the reinforcing member is smaller than the cross section of the existing column 1 and the existing beam 2 constituting the outer shell frame of the existing building. It is basically to be implemented in. However, as in the embodiment shown in FIG. 3, for example, when the sleeve 11 is attached to the existing pillar 1 and the substantial opening of the building is formed by the sleeve 10, the existing pillar 1 is used. In addition, the meaning that the cross section is smaller than the cross section of the existing beam 2 means that it is a size including the opening edge of the sleeve wall 10.

According to the present invention, the steel column 3 as a reinforcing member may be configured and implemented as a composite of a normal steel portion and an extremely low yield point steel portion serving as a vibration control element (vibration control device). It is. In the case of the embodiment shown in FIGS. 1A and 1B, two steel columns 3 as reinforcing members are arranged along both sides of one existing column 1 constituting the outer shell frame of an existing building. It is attached in parallel (however, two or more columns are also possible). A part incorporating the ordinary steel plate 5 between the two columns 3, 3 and an extremely low yield point steel plate 6 (vibration control element) It is configured as a complex with the part incorporating the vibration device. However, in place of the ordinary steel plate 5 and the extremely low yield point steel plate 6 serving as a vibration damping element, a composite having a configuration in which braces made of each material are incorporated may be used. Reference numeral 9 in FIG. 1A denotes left and right columns 3 at the boundary between the ordinary steel plate 5 and the extremely low yield point steel plate 6.
It is a connecting pier connecting three.

As for the means for attaching the steel beam 4 (and the same for the steel column 3) as the reinforcing member, as shown in FIG. 1B, the post-installed anchor 7 is attached to the existing beam 2 of RC or SRC to be attached. After that, the space (groove) of the steel beam 4 arranged so as to accommodate the head of the construction anchor 7 is densely filled with the non-shrinkable grout 8 and integrated and attached. In this case, a stud is provided on the side of the steel beam 4 as shown in FIG.

The behavior of the reinforcing column 3 during an earthquake in the vibration control method shown in FIG. 1 is exaggerated as a conceptual diagram in FIGS. 2A and 2B. When the extremely low yield point steel portion 6 (vibration control device) is deformed in the elastic range, the horizontal deformation of the reinforcing column as a whole changes linearly in the height direction as shown in FIG. 2A. When the extremely low yield point steel portion 6 yields, as shown in FIG. 2B, the extremely low yield point steel portion 6 yields before the ordinary steel portion 5 due to a difference in the yield point from the ordinary steel portion 5. From the point of yield, horizontal deformation (interlayer deformation angle) concentrates on the extremely low yield point steel portion 6. However, since the ordinary steel portion 5 still remains in the elastic range, the deformation is concentrated on the extremely low yield point steel portion 6 and locally large deformation occurs, thereby enhancing the effect of absorbing seismic energy.

The existing building and the steel frame reinforcing member transmit the seismic force to the steel column 3 by the steel beam 4 integrated by the post-installed anchor 7 and the like. The bending moment generated by the shearing force applied to the steel column 3 as the reinforcing member is borne by the steel beam 4. Since it is up to the above, the steel column 3 as a reinforcing body has a composite structure as shown in FIG.
Even when one column itself is implemented in a configuration in which the column material of the extremely low yield point steel portion and the column material of the ordinary steel portion are joined in series,
The same operation and effect as described above can be obtained.

Next, in the embodiment shown in FIGS. 3A and 3B, since the sleeve wall 10 is attached to the existing pillar 1 constituting the outer shell frame of the existing building, it is lighted that the building opening is not closed. The two steel columns 3, 3, which are reinforcing members, are attached in parallel at an interval of the full width to the opening edges of the left and right sleeve walls 10, 10. Between these two steel columns 3, 3, horizontal crossbars 9, 9 are attached at two places (however, not limited to three) that divide the floor height of the pillar 3 into approximately three equal parts. In the uppermost frame (however, the same applies in the middle or lowermost frame), a very low yield point steel material (150 × 1
Brace 6 'made of H-shaped material of about 50mm)
In the other frame, a steel plate 5 made of ordinary steel and having a thickness of about 20 mm is incorporated to form a composite structure.

FIG. 3B also shows a steel beam 4 as a reinforcement.
In addition to installing the post-installed anchor 7 on the existing beam 2 as a means for integrally attaching the existing beam 2 constituting the outer shell frame of the existing building, the steel beam 4 is also provided with a stud 11 to be embedded in the grout. This shows a configuration that enhances the effectiveness of integration.

[0020]

[Effects of the present invention] According to the method of reinforcing the existing building shell according to the present invention, particularly as a method of reinforcing an RC building and an SRC existing building, it is possible to "remain in a living room" without impairing the livability of the existing building. " INDUSTRIAL APPLICABILITY The present invention is excellent in workability because it is reinforced with a relatively light-weight steel frame reinforcing body having good workability. In addition, a seismic control device made of ultra-low yield point steel is installed in the steel column part of the reinforcement, and the seismic energy is effectively absorbed by concentrating the interlayer deformation angle in this part, making it effective for seismic control reinforcement of existing buildings. Is big.

The present invention is a reinforcement for attaching steel beams and columns to columns and beams of the outer shell of an existing building, and does not block openings or the like of the building. In addition, since it is a seismic control reinforcement method that does not reduce the working space and living space inside the building, it is highly effective for the use of existing buildings.

[Brief description of the drawings]

FIGS. 1A and 1B are a front view and a vertical sectional view, respectively, showing a main part of an embodiment of a method for controlling and damping an outer shell of an existing building according to the present invention.

FIGS. 2A and 2B are conceptual diagrams illustrating the operation and effect of the method of damping and reinforcing a shell of an existing building according to the present invention when viewed from the front.

FIGS. 3A and 3B are a front view and a vertical cross-sectional view showing a main part of a different embodiment of the method of controlling and reinforcing a shell of an existing building according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing column 2 Existing beam 3 Steel column 4 Steel beam 5 Normal steel part 6 Extremely low yield point steel which is a vibration control element

Claims (4)

[Claims] Claims: 1. A method for providing seismic control and reinforcement with a reinforcing member that is added to the outside of a shell frame of an existing building, the method comprising the steps of: A method of controlling and reinforcing a shell of an existing building, characterized in that a part of a steel column and a whole or a part of a steel beam are attached so as to be integrated, and a vibration control device is incorporated in the steel column. 2. The outer shell of an existing building according to claim 1, wherein the cross section of the steel beam and the steel column is smaller than the cross section of the existing column and the existing beam constituting the outer frame of the existing building. How to reinforce vibration control. 3. The outer shell of an existing building according to claim 1, wherein the steel column is constituted as a composite of a normal steel part and a steel part having an extremely low yield point serving as a vibration damping element. How to strengthen the seismic control. 4. A steel column is provided with at least two parallel columns per existing column constituting an outer shell frame of an existing building along the same column, and a portion incorporating a normal steel material between the two columns. The seismic control method of an existing building outer shell according to claim 1, wherein the structural member is configured as a composite with a part incorporating an extremely low yield point steel material serving as a seismic control element.