JPH1162268A - Aseismatic repairing method of existing building, and aseismatic structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly improve the aseismatic safety of an existing building, improve the workability and the cost, and prevent the internal space of the building from being adversely affected. SOLUTION: A slit 6 extending in the perpendicular direction is formed in an earthquake resisting wall 5 forming a part of an existing building 2 to divide the wall 5 into a plurality of wall bodies 8, 8 adjacent to each other in the horizontal direction where the wall 5 is extended through the slit. A vibration control structure 1 is formed by connecting the wall bodies 8, 8 by damper components 9, 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofitting method for improving the seismic resistance of an existing building and a vibration control structure for reducing the vibration response of the building during an earthquake.

[0002]

2. Description of the Related Art In recent years, buildings have been required to have a high level of earthquake resistance, and newly constructed buildings usually have sufficient earthquake resistance. However, buildings that were built in the past and are still in use today are considered to have sufficient seismic resistance at the time of construction, but there is a problem with seismic resistance according to current standards. It is said that such existing buildings need to be renovated to improve their seismic resistance.

[0003] Many buildings of relatively old construction age have insufficient horizontal strength and toughness. In order to improve the seismic resistance of such existing buildings, earthquake-resistant walls are required at important points inside the buildings. In general, a method of increasing the horizontal strength and the toughness by adding a reinforcing element such as a steel plate or a column, or covering the member with a steel plate, carbon fiber, or the like is taken.

[0004]

However, when an earthquake-resistant element is simply added inside a building as described above, not only does the weight of the building itself increase, but also the rigidity increases with an increase in the strength. As a result, there is a concern that the earthquake input to the building will increase.

In order to avoid such a problem,
Numerous methods have been proposed to reduce and reduce the vibration response of buildings by installing and adding energy absorbing mechanisms such as vibration dampers inside buildings, but all of these methods are cumbersome to install. In addition, there is a problem in terms of cost.

[0006] Further, in the case where the seismic element is added inside the building as described above, or in the case where the energy absorbing mechanism or the like is installed or added, depending on the position of the added seismic element or the vibration control mechanism. However, it is unavoidable that problems such as the habitability and availability of the internal space of the building are impaired.

[0007] The present invention has been made in view of the above circumstances, and not only can greatly improve the seismic safety of existing buildings, but also is excellent in workability and cost. Further, an object of the present invention is to provide a seismic retrofitting method for an existing building and a vibration control structure that do not adversely affect the internal space of the building.

[0008]

Means for Solving the Problems In the present invention, the following means are employed in order to solve the above problems. That is, the seismic retrofitting method for an existing building according to claim 1 is a seismic retrofitting method for improving the seismic resistance of an existing building, wherein a wall constituting a part of the existing building is vertically oriented. Is formed, the wall is divided into a plurality of walls adjacent to each other in the horizontal direction through which the walls extend through the slit, and the adjacent walls are separated by a damper component. It is characterized by being connected to each other.

[0009] According to the seismic retrofitting method for an existing building, it is possible to improve the deformability of the wall and to provide the wall with a function of absorbing seismic energy. Can be. Further, according to the method for repairing an existing building, the repair can be performed without any adverse effect on the use of the internal space of the building.

[0010] In the vibration control structure according to the second aspect, a slit extending in a vertical direction is provided in a wall of the building,
The wall is divided into a plurality of horizontally adjacent walls extending through the slit, and the adjacent walls are connected to each other by a damper component.

In this vibration control structure, the slits not only improve the deformability of the walls, but also cause the walls constituting the walls to be displaced relative to each other when the building vibrates during an earthquake. Damper components connecting the bodies can absorb seismic energy.

According to a third aspect of the present invention, there is provided a damping structure according to the second aspect, wherein the damper component is made of extremely mild steel.

[0013] With the above structure, the vibration control structure can be formed at a low cost, and the work related to installation can be easily performed.

According to a fourth aspect of the present invention, in the vibration control structure of the second or third aspect, the upper end edge and the lower end edge of the wall extend horizontally from the upper end and the lower end of the slit. A horizontal slit is provided.

[0015] With the above structure, in this vibration control structure, the toughness of the beam can be ensured and the shear failure can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a vibration control structure 1 according to an embodiment of the present invention. Damping structure 1
Is provided for the earthquake-resistant wall (wall) 5 located on the construction surface surrounded by the columns 3 and 3 and the beams 4 and 4 inside the existing building 2, and a slit formed in the earthquake-resistant wall 5 6, walls 8, 8 separated from each other by
, Which are made of ultra-mild steel and connect the dampers 8 to each other.

As shown in the figure, the slit 6 is configured to extend in the vertical direction, and the upper end 6a and the lower end 6b of the slit 6 extend from the upper end 8a and the lower end 8b of the walls 8,8.
Are provided so as to extend in the horizontal direction.

2 and 3 are sectional views taken along the line AA in FIG.
It is a figure which shows each -B cross section. As shown in the figure,
The damper components 9, 9, ... are both wall surfaces 5a of the earthquake-resistant wall 5,
5b.

FIG. 4 is a diagram showing a state where the damper component 9 shown in FIG. 1 is viewed in an enlarged manner. As shown in the figure, the damper component 9 is formed by bolts 14, 14,... And nuts 15, 15,.
It is attached to. 5 is a view showing a cross section taken along line CC in FIG. 4. As shown in the figure, bolts 14, 14,... Penetrate through holes 17, 17,. Configuration, thereby,
The damper components 9, 9 attached so as to face each other with the wall 8 interposed therebetween are configured to be integrated with each other by bolts 14, 14,... And nuts 15, 15,.

The above is the main configuration of the present embodiment. Next, a method of retrofitting an existing building 2 according to the present embodiment will be described. The seismic retrofitting method according to the present embodiment is to improve the seismic performance of the existing building 2 by installing the vibration control structure 1 inside the existing building 2.
Specifically, it is performed according to the following procedure.

That is, first, a slit 6 and horizontal slits 11, 11,... Are provided in the earthquake-resistant wall 5 which forms a part of the existing building 2, whereby the earthquake-resistant wall 5 is formed on the wall bodies 8, 8. To divide. Then, through holes 17, 17,... Are provided at predetermined positions of these wall bodies 8, 8, and as shown in FIG. 5, damper constituent members 9, 9 are removed from both wall surfaces 8c, 8c of the wall body 8. Apply these damper components 9
The bolts 14, 14, inserted through the through holes 17, 17,.
.. And the nuts 15, 15,..., Thereby connecting the damper components 9, 9,. By doing so, the walls 8, 8 are connected to each other by the damper components 9, 9,..., And the vibration control structure 1 as shown in FIG. 1 is realized.

According to the seismic retrofitting method for the existing building 2, the shear-resistant wall 5 is divided into the walls 8, 8 by the slits 6, so that the shear-resistant wall 5 is prevented from being sheared and the toughness (deformability) is improved. Can be improved. Further, since the walls 8, 8 are connected to each other by the damper components 9, 9,..., When the walls 8, 8 are displaced relative to each other due to the earthquake, the damper components 9 are subjected to vibration energy due to the earthquake. -Can be made to act to absorb.

FIGS. 6 and 7 show the effects of the seismic retrofitting method according to the present embodiment. FIG.
Is a graph schematically showing the restoring force characteristics of the earthquake-resistant wall 5, where the horizontal axis represents the deformation δ of the earthquake-resistant wall 5, and the vertical axis represents the shear force Q that the earthquake-resistant wall 5 bears. In the figure, p indicates the restoring force characteristic of the earthquake-resistant wall 5 before the repair, and q indicates the restoring force characteristic of the earthquake-resistant wall 5 after the earthquake-resistant repair according to the present embodiment. In the figure, for the sake of comparison, the restoring force characteristics when the earthquake-resistant wall 5 is reinforced so as to increase the strength at r are shown in FIG. The restoring force characteristics when no.

FIG. 7 is a graph showing the history of the restoring force characteristics of the earthquake-resistant wall 5 when horizontal vibration is applied.
(A) shows the restoring force characteristics of the earthquake-resistant wall 5 when horizontal vibration acts before the earthquake-resistant repair is performed, and (b) shows only the slit 4 in the earthquake-resistant wall 5 and no damper component 9. (C) shows the restoring force characteristic when the seismic retrofitting method according to the present embodiment is applied.

As can be seen from the graph of FIG. 6, compared with before the renovation (p in the figure) or in the case of reinforcement (r in the figure) to increase the proof stress, the seismic retrofit according to the present embodiment was performed. In this case (q in the figure), the shear force Q borne by the shear wall 5 for the same deformation δ is greatly reduced.

The effect of reducing the shearing force Q when the seismic retrofitting is performed according to the present embodiment (q in FIG. 6) is obtained when the damper components 9, 9,... Are not installed (s in FIG. 6).
However, the area surrounded by the hysteresis curve of the restoring force characteristic shown in (c) of FIG. 7 is greatly increased as compared with (b). As a result, according to the present embodiment, the hysteresis energy can be increased, and an excellent vibration damping effect can be obtained.

As described above, the vibration control structure 1 in the existing building 2
By improving the seismic retrofit by providing a new building, it is possible to improve the toughness of the earthquake-resistant wall and to provide the energy-absorbing function to the earthquake-resistant wall even in a building that does not satisfy the current standards and is not suitable for existing buildings. ,
It is possible to achieve seismic performance higher than the current standard.

In particular, by improving the deformation performance of the earthquake-resistant wall 5, the seismic force acting on the building is reduced, and unlike the so-called seismic reinforcement, a predetermined seismic performance can be attained without the need to reinforce the cross-section of existing structural members. Thus, economicalization can be achieved while ensuring safety. further,
Since the structural members are not added, there is no problem associated with the increase in weight, and the seismic retrofit can be performed without impairing the livability and availability of the internal space of the existing building 2.

Also, in this earthquake-resistant repair method, since a structure is adopted in which the earthquake-resistant wall 5 is divided by the slits 6 formed in a vertically extending shape, the vertical stripes of the earthquake-resistant wall 5 are not cut off. With the seismic retrofitting, there is no possibility that the load from the cantilever member or the like supported by the anti-seismic wall 5 will adversely affect the anti-seismic wall 5. Furthermore, in this seismic retrofitting method, there is almost no waste and the construction period can be shortened as compared with the case where the existing wall is dismantled and new reinforcement is performed.

On the other hand, in the above-described vibration control structure 1, the earthquake-resistant wall 5 is divided into the walls 8, 8 by the slits 4,
Further, the wall bodies 8, 8 are made of damper components 9, 9,.
Are joined by Therefore, at the time of the earthquake, the damper components 9, 9, ... yield and the walls 8, 8 are relatively displaced,
This makes it possible for the damper components 9, 9,... To favorably absorb vibration energy due to the earthquake, and for the shear-resistant wall 5 to deform favorably. The characteristics related to the absorption of the vibration energy are as shown in FIGS. 6 and 7, and an excellent vibration damping effect can be obtained. If the damper components 9, 9,... Are excessively deformed during the earthquake, it is also possible to replace this part after the earthquake.

Further, in the above-described damping structure 1, since the damper components 9, 9,... Are formed of extremely mild steel, stable damping performance can be exhibited without depending on temperature and frequency. And the damper performance can be exhibited from a small yield displacement. Furthermore, the installation cost does not increase.

Further, in the above-described vibration control structure 1, the horizontal slit 11 extending horizontally from the upper end 6a and the lower end 6b of the slit 6 partially extends with respect to the upper end edge 8a and the lower end edge 8b of the wall body 8. , 11,..., The shear force generated in the beams 4, 4 when the walls 8, 8 are relatively displaced can be reduced, and the toughness of the beams 4, 4 can be ensured. . Therefore, the safety of the existing building 1 can be ensured by preventing the beams 4, 4 from being sheared.

In the above, one embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and a part of the configuration is changed without departing from the gist of the present invention. It does not matter. For example, in the above embodiment, as shown in FIG. 8, a plurality of slits 6 may be provided in the earthquake-resistant wall 5, and in this case, the deformation performance of the earthquake-resistant wall 5 and the damper components 9, 9 , Can further improve the energy absorption performance of the vibration damping structure 1. Further, in the above embodiment, a general bearing wall or the like may be used instead of the earthquake-resistant wall 5. Further, the building on which the vibration control structure 1 is to be installed does not need to be an existing building as in the above-described embodiment, and may be installed in a new building.

[0034]

As described above, according to the seismic retrofitting method for an existing building according to the first aspect, the wall is divided into a plurality of wall bodies by forming a slit extending in the vertical direction with respect to the wall. Furthermore, by connecting these walls with a damper component, it is possible to prevent shear failure of the wall and improve the toughness (deformation performance), and at the same time, at the time of an earthquake, to reduce the vibration energy due to the earthquake. -Can function to absorb. By performing seismic retrofitting in this way, unlike so-called seismic retrofitting, the required seismic performance can be obtained without the need to reinforce the cross-section of existing structural members, achieving economics while ensuring safety. be able to. Further, since no additional structural members are provided, there is no problem associated with an increase in weight, and the livability and availability of the internal space of the existing building are not impaired.
Furthermore, in this seismic retrofitting method, compared with the case where the existing wall is dismantled and new reinforcement is performed, there is almost no waste, and the construction period can be shortened.

In the vibration control structure according to the second aspect, the wall is divided as a wall by a slit, and these walls are connected to each other by a damper component. Therefore, at the time of an earthquake, the damper component yields and the wall body relatively displaces, whereby the damper component absorbs vibration energy due to the earthquake satisfactorily and exhibits an excellent vibration control function.

According to the vibration damping structure of the third aspect, since the damper component is made of extremely mild steel, stable vibration damping performance can be obtained without depending on the temperature and the frequency, and a small yield displacement can be obtained. , The damper performance is exhibited.
Furthermore, the installation cost does not increase.

According to the vibration damping structure of the present invention, the horizontal slits extending horizontally from the upper and lower edges of the slits are provided at the upper and lower edges of the wall, so that the walls are relatively displaced from each other. In this case, the shearing force applied to the beam can be reduced. Furthermore, by horizontal slit,
Since the toughness of the beam can be ensured, the safety of the building can be ensured by preventing the beam from being sheared.

[Brief description of the drawings]

FIG. 1 is a front view showing an earthquake-resistant wall (wall) provided with a vibration control structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is an enlarged front view showing damper components in the vibration damping structure shown in FIG.

FIG. 5 is a sectional view taken along the line CC in FIG.

FIG. 6 is a graph comparing restoring force characteristics of an earthquake-resistant wall (wall) when the seismic retrofitting method of the present invention is applied with those before seismic retrofitting and when other seismic retrofitting methods are applied.

FIG. 7 is a graph comparing hysteresis curves of restoring force characteristics of an earthquake-resistant wall (wall) when the seismic retrofitting method of the present invention is applied with those before and after other seismic retrofitting methods. is there.

FIG. 8 is a front view showing a seismic wall (wall) provided with a vibration control structure according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration control structure 2 Existing building 5 Seismic wall (wall) 6 Slit 6a Upper end 6b Lower end 8 Wall 8a Upper end edge 8b Lower end edge 9 Damper constituent material 11 Horizontal slit

Claims (4)

[Claims] 1. A seismic retrofitting method for improving seismic resistance of an existing building, wherein a slit extending in a vertical direction is formed in a wall constituting a part of the existing building, An existing building, wherein a wall is divided into a plurality of horizontally adjacent walls extending in the horizontal direction through the slits, and the adjacent walls are connected to each other by a damper component. Seismic retrofitting method. 2. A wall of a building is provided with a slit extending in a vertical direction, and the wall is divided into a plurality of horizontally adjacent walls extending through the slit through the slit. The adjacent wall bodies are connected to each other by a damper component. 3. The vibration damping structure according to claim 2, wherein the damper component is made of extremely mild steel. 4. The vibration control structure according to claim 2, wherein a horizontal slit extending horizontally from an upper end and a lower end of the slit is provided at an upper edge and a lower edge of the wall. A vibration control structure characterized by the following.