JP2000310044A - Vibration controlling reinforcement method for outer shell of existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration controlling reinforcement method for the outer shell of an existing building capable of performing while dwelling without impairing the habitability of the existing building. SOLUTION: A steel frame beam 3 is disposed along the outer surface of an existing beam forming the outer shell frame of an existing building and these beams are integrated with each other. A mounting part 3' fixed to an existing column is provided at a position corresponding to an extension portion of the steel frame beam 3, and connected to the steel frame beam 3 through a damper 4 absorbing an energy utilizing a deformation of the steel frame beam 3 due to the rotation of the material end of the steel frame beam 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of technology for providing seismic control and reinforcement by using a reinforcing member that extends an existing building outside its outer shell frame. In particular, at least an existing building made of reinforced concrete or steel reinforced concrete is used. When the strength of the beam is smaller than that of the pillar on one surface, indicating a "beam collapse type of destruction" and the strength of the building as a whole is insufficient, it is carried out "as is" without impairing the livability of the building Possible methods of seismic reinforcement of existing building shells.

[0002]

2. Description of the Related Art Hitherto, various researches and developments have been made on a method of reinforcing a living room by using an existing building to control the vibration, and many proposals have been made. For example, wall addition and additional reinforcement, reinforcement by steel frame bracing, and vibration control reinforcement by steel plate shear walls can be cited.

[0003] The present applicant has also disclosed a method of using a precast concrete member as a reinforcing material for a seismic control reinforcement method capable of performing "as-is" construction without impairing the livability of an existing building, as disclosed in Japanese Patent Application Laid-Open No. H11-62264. Discloses a method of using a steel frame and a vibration damper (damper) in Japanese Patent Application Hei 1
No. 0-29575.

[0004]

[Problems to be Solved by the Invention] By the way, even if an existing building is referred to as an existing building, the existing building designed and constructed before the enforcement of the New Seismic Design Law, for example, as shown in FIG. When a seismic diagnosis is performed on a building having a multi-story shear wall structure A and a pure ramen frame in the girder direction, the girder direction often falls below the target value. The reason for this is that the frame on the south side in the girder direction has a lower floor height and a larger opening to suppress the beam truss. As a result, as shown in FIG. 8, the behavior of the building at the time of the earthquake is as shown in FIG. 8, in the case of a rigid frame in which the strength of the beam 2 is significantly smaller than that of the column 1, the interlayer deformation due to the horizontal force such as an earthquake is governed by the deformation of the beam 2. This indicates a so-called “beam collapse type fracture type” in which the deformation of the beam 2 progresses greatly, and is due to the fact that the toughness is rich but the proof strength is extremely small.

It is unreasonable to directly apply the above-described vibration control reinforcement method to the vibration control reinforcement of an existing building exhibiting the above-mentioned "beam collapse type failure type". This is because not only is it unnecessary to reinforce the existing columns, but also as described above, with the reinforcement method that adds a damper to the column material that controls and reinforces the existing columns, the strength of the existing columns is lower than the strength of the existing beams in the first place. This is because, in the case of an existing building showing a “beam collapse type of failure”, the pillars do not deform during an earthquake, and the damping effect of the damper cannot be expected.

[0006] An object of the present invention is to provide an existing building having a "beam collapse type" in which the strength of existing columns is significantly greater than the strength of existing beams on at least one structural surface, and the strength (seismic resistance) of the whole building is increased. For existing reinforced concrete or steel reinforced concrete buildings that are in shortage, existing building shells that can be satisfactorily implemented "as is" without impairing habitability by reinforcing steel structures with excellent workability It is to provide a seismic control reinforcement method.

A second object of the present invention is to provide a steel beam and a damper in a form and structure in which only an existing beam is reinforced by a steel beam and seismic energy is absorbed by utilizing the end rotation deformation of the end of the steel beam. The purpose of the present invention is to provide a supplementary method of reinforcing the seismic control.

[0008]

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 invention, wherein the existing building is made of a reinforced concrete structure or a steel reinforced concrete structure. In the case where the beam strength is smaller than the column on at least one of the structural surfaces and the beam collapse type is shown, a method of seismic control reinforcement with a reinforcing member added to the outside of the outer frame is used. Along with the existing beam constituting the outer shell frame, a steel beam is arranged on the outer surface thereof and integrated, and in an existing column constituting the outer frame of the existing building, at a position corresponding to an extension of the steel beam. An attachment portion fixed to the existing pillar is provided, and the steel beam is joined to the steel beam via a damper that absorbs energy by utilizing the material end rotation deformation of the steel beam.

According to a second aspect of the present invention, in the method for reinforcing a shell of an existing building according to the first aspect, the beam is disposed on an outer surface of the existing frame rather than the existing beam constituting the outer frame of the existing building. It is characterized by small steel beams.

According to a third aspect of the present invention, in the method for damping and reinforcing a shell of an existing building according to the first or second aspect, the beam is arranged on the outer surface of the existing building along the existing beam constituting the shell frame. Steel beams are integrated with existing beams by post-installed anchors.

According to a fourth aspect of the present invention, in the method for damping and reinforcing an existing building shell according to the first or second aspect, the mounting portion fixed to the existing column constituting the outer frame of the existing building includes a plurality of mounting portions. It is characterized in that it is constructed as a fixed beam on an existing pillar by constructing a shear pin.

According to a fifth aspect of the present invention, in the method for damping and reinforcing an existing building shell according to the first aspect, the position of the damper for joining the steel beam and the mounting portion is such that the deformation of the existing beam due to bending stress is caused. It is characterized in that it is the position of the beam end which becomes the maximum.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a method for controlling and reinforcing a shell of an existing building according to the present invention.

[0014] The method for controlling the vibration of an existing building shell according to the present invention is an existing building made of reinforced concrete or steel reinforced concrete, in which at least one structural surface has a lower strength of the beam 2 than the column 1. This method is preferably implemented as a method of reinforcing the seismic control with a steel frame reinforcement added to the outside of the outer shell frame of an existing building showing the "beam collapse type failure type".

First, the main point of the present invention is to dispose a steel beam 3 on the outer surface of the existing building 2 along the existing beam 2 constituting the outer shell frame of the existing building, and integrally add the steel beam.

The second point is that an attachment part 3 ′ is fixed at a position corresponding to an extension of the steel beam 3 in the existing column 1, which also constitutes the outer shell frame of the existing building. The beam is joined via a damper 4 that absorbs energy by using the material end rotation deformation of the beam (the invention according to claim 1). The illustrated mounting portion 3 'is shown as a part of a steel beam, but is not limited thereto. The shape and structure of the damper 4 may be any as long as it supports one side of the damper 4 extremely.

However, in order to prevent the opening of the existing building or the like from being blocked by the implementation of the method of reinforcing the vibration damping, thereby deteriorating the livability, the existing beams 2 constituting the outer frame of the existing building should be used. The configuration is such that the steel beam 3 disposed on the outer surface thereof has a small configuration (the invention according to claim 2).

As described above, the steel beam 3 arranged on the outer surface along the existing beam 2 constituting the outer shell frame of the existing building
Is integrated with the existing beam 2 by a post-installed anchor 5 such as a chemical anchor as an example of an integrating means (the invention according to claim 3). Further, the hoop muscle 9 is installed, and the non-shrink mortar 6 is injected to complete the integration (FIG. 2).
Regarding the mounting portion 3 'fixed to the outer surface of the existing pillar 1 constituting the outer shell frame of the existing building, when the pillar 1 is attached with the sleeve wall 8, the shear pin 7 such as a plurality of steel pipes is attached to the sleeve wall 8
To the existing column 1 as a fixed beam (the invention according to claim 4).

In the above-mentioned method of reinforcing the outer shell of an existing building, the damper 4 is installed rather than the end of the steel beam 3 attached to the outer surface of the existing beam 2 constituting the outer frame of the existing building. The position is a beam end where the deformation (see FIG. 8) due to bending stress in the existing beam 2 is maximized, specifically, a position on both side surfaces of the existing column 1. In the case where there is a sleeve wall 8 attached to the same pillar 1 as in the illustrated example, it is important to connect the beams by providing the damper 4 at the end of the sleeve wall 8 and providing the damper 4 at the end. (The invention according to claim 5).

FIG. 4 shows a view of an existing building in which the outer shell has been subjected to vibration control.

As the damper 4 for absorbing energy by utilizing the end rotation deformation of the steel beam 3 described above, for example, Japanese Patent Application Laid-Open No. 10-297725 of the present applicant discloses a seventh example.
The rotating hinge type viscoelastic damper described in the figure, the extremely low yield point steel damper described in FIG. 8 of the same publication, the friction damper described in FIG. 9 of the same publication, and the friction damper described in FIG. 10 of the same publication are described. A viscous damper, an H-beam damper described in FIG. 11 of the publication, and the like can be adopted and implemented. Incidentally, the H-shaped steel damper does not employ the pin hinge mechanism as illustrated in FIGS. 9A and 9B, but forms a notch 26 in the H-shaped steel 11 that allows bending deformation accompanying deformation of the steel beam 3, The notch 26 is reinforced by an elasto-plastic plate 27 made of extremely low yield point steel, lead or the like (FIG. 9B). Energy is absorbed by elasto-plastic deformation of the elasto-plastic plate 27 made of ultra low yield point steel or lead. I do.

FIG. 6 shows the behavior when the existing building subjected to the vibration control reinforcement as described above receives a horizontal force such as an earthquake.
Similar to Fig. 8, which shows the seismic behavior before the seismic reinforcement, the existing building shows the above-mentioned "beam collapse type failure mode".
The bending deformation of the existing beam 2 greatly advances. Therefore, the damper 4 effectively absorbs the seismic energy by using the material end rotation deformation generated between the mounting portion 3 ′ fixed to the existing column 1 and the steel beam 3, and exerts a vibration control effect.

FIG. 7 shows the results of analysis using an analysis model. The load-deformation without the seismic reinforcement, which exhibits the behavior shown in FIG. 8, and the load after the seismic reinforcement are applied, are shown.
A curve B obtained by subtracting the numerical value of the relationship of the deformation is obtained as the load-deformation relationship of the seismic control reinforcement.

For example, when an original wave equivalent to 50 Kine is input, the reinforcing effect that satisfies the target criterion (1/250 of the interlayer displacement angle) is confirmed as the response result when the vibration is reinforced.

[0025]

[Effects of the present invention] According to the method for damping and reinforcing an existing building shell according to the first to fifth aspects of the present invention, the seismic energy is absorbed by the damper. Equivalent seismic resistance can be secured at the reinforced part (construction surface). In addition, reinforced concrete or steel reinforced concrete structures are installed only on the outer surfaces of the existing beams that make up the outer shell of the existing building. In addition, it is possible to reinforce the seismic control without impairing the livability and not to reduce the working space and living space inside the building. In addition to being able to reinforce while using the existing building, it can be reinforced while it is still in place, and because it is reinforced with steel frames, it is lighter, has better workability, and can shorten the construction period compared with RC reinforced construction.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of a vibration control reinforcement according to the present invention.

FIG. 2 is a cross-sectional view taken along the arrow in FIG.

FIG. 3 is a cross-sectional view taken along the arrow in FIG.

FIG. 4 is a view of an existing building reinforced with vibration control.

FIG. 5 is a plan view of the existing building.

FIG. 6 is an earthquake behavior diagram of a building reinforced by vibration control according to the present invention.

FIG. 7 is a diagram showing a load-deformation relationship of an earthquake response based on an analysis model.

FIG. 8 is a seismic behavior diagram of a building without a seismic control reinforcement.

FIGS. 9A and 9B are an exploded view and an assembled view showing an example of a damper.

[Explanation of symbols]

 Reference Signs List 1 pillar of existing building 2 beam of existing building 3 steel beam 3 'attachment part 4 damper 5 post-installation anchor 7 shear pin 8 sleeve wall

Claims (5)

[Claims] 1. When an existing reinforced concrete or steel reinforced concrete building has a beam strength smaller than a column in at least one structural surface and exhibits a collapse type of beam collapse type, it is added outside the outer shell frame. In a method for performing seismic control reinforcement by a reinforcing body, a steel frame beam is arranged and integrated on an outer surface thereof along an existing beam forming an outer shell frame of the existing building; and forming an outer shell frame of the existing building. In the existing column, a mounting portion fixed to the existing column is provided at a position corresponding to the extension of the steel beam, and the steel beam is connected to the steel beam via a damper that absorbs energy using the end rotation deformation of the steel beam. A method of damping and strengthening the outer shell of an existing building, characterized by being joined together. 2. The outer shell of an existing building according to claim 1, wherein the steel beam arranged on the outer side thereof is smaller than the existing beam constituting the outer shell frame of the existing building. How to reinforce vibration control. 3. A steel beam arranged on the outer surface along an existing beam constituting a shell frame of an existing building is integrated with the existing beam by a post-installed anchor. The method of vibration control reinforcement of the existing building outer shell described. 4. The mounting part fixed to an existing column constituting an outer shell frame of an existing building is constructed by applying a plurality of shear pins to the existing column as a fixed beam. The method of vibration control reinforcement of the existing building outer shell described. 5. The existing building according to claim 1, wherein a position of the damper for joining the steel beam and the mounting portion is a position of a beam end at which the deformation due to bending stress in the existing beam is maximized. How to reinforce the outer shell.