JP2000073608A - Installation structure viscoelastic wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of bolts to be required for clamping a viscoelastic wall having a small aspect ratio. SOLUTION: A plurality of viscoelastic walls of first and second steel plates laminated by holding a viscoelastic body are arranged between both up and down beams, and in the case at least either of the first steel plate and second steel plate of each of the viscoelastic walls is fixed to a beam by clamping a bolt, the steel plates are connected to each other by clamping the bolt. In the case the viscoelastic wall 10 having such a constitution as one inside steel plate 12 as the second steel plate is inserted between two outside steel plates 11 as the first steel plate, the lower end of each of the outside steel plates 11 is fixed to a lower side beam 15a by clamping a bolt 18 through a lower fixed metal hardware 14, and the sides of the outside steel plate 11 are connected with a joint plate 21. In that case, an upper fixed metal hardware 16 is welded to an upper side beam 15b to vertically hang down, and the upper fixed metal hardware 16 and the upper part of the inside steel plate 12 are held between two splice plates 19 and are clamed by bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for installing a viscoelastic wall having a viscoelastic body sandwiched between steel plates between upper and lower beams.

[0002]

2. Description of the Related Art In recent years, a viscoelastic wall installed as a vibration damper in a building has been developed and put into practical use. This is installed as a wall between the upper and lower beams as shown in FIG. 5, and comprises two outer steel plates 2a fixed to the lower beam 1a and rising and fixed to the upper beam 1b. A viscoelastic body 3 such as asphalt is sandwiched between a single inner steel plate 2b and the lower steel plate 2b. When the building undergoes interlayer displacement during an earthquake, the two steel plates 2a and 2b are relatively displaced in the plane. The vibration energy is absorbed by the viscous resistance force of the viscoelastic body 3 generated at that time, and the vibration of the building is attenuated.

[0003] Such a viscoelastic wall is formed by upper and lower beams 1a, 1b.
5, as shown in FIG. 5, a fixing hardware 4 having an inverted T-shaped cross section is previously bolted to the lower end of the outer steel plate 2a, and the lower metal 1a is fixed to the upper flange of the lower beam 1a. In general, a structure is adopted in which a horizontal fixing plate 5 is welded to the upper end portion of the inner steel plate 2b in advance and the bolt is fastened to the lower flange of the upper beam 1b. is there.

[0004]

The above viscoelastic wall has a large shear force Q due to the interlayer displacement of the building.
And the moment M act, and the bolt fastening the viscoelastic wall to the beams 1a and 1b must be able to withstand such shearing force Q and moment M. In this case, the required number of bolts is determined by the moment M because the axial tensile strength of the bolt is usually inferior to the shear strength. Then, the moment M acting on the viscoelastic wall increases as the aspect ratio W / H of the viscoelastic wall decreases, that is, as the shape becomes longer, the required number of bolts also increases, and the aspect ratio becomes about 1 or more ( In other words, in the case of an almost square shape to a longer length than that, a larger number of bolts are required as the bolt pitch becomes smaller to an unrealistic degree. Therefore, in the related art, a horizontally long viscoelastic wall having an aspect ratio of about 2 to 3 has to be adopted, which is an obstacle in designing and reducing the size and weight of the viscoelastic wall. Was.

In view of the above circumstances, the present invention provides an effective installation structure capable of reducing the required number of bolts even with a viscoelastic wall having a small aspect ratio.

[0006]

According to a first aspect of the present invention, there is provided a first steel plate fixed to a lower beam and rising, and a second steel plate fixed to an upper beam and falling. In between, the viscoelastic body is sandwiched by an adhesive-like body,
A structure for installing a viscoelastic wall between upper and lower beams in which the respective steel plates are relatively displaced in a plane by interlayer displacement of a building to obtain a damping effect by viscous resistance of the viscoelastic body. A plurality of the viscoelastic walls are arranged in parallel between the upper and lower beams, and at least one of the first steel plate and the second steel plate of each viscoelastic wall is fixed to the beams by bolting, The steel plates fixed to each viscoelastic wall by bolting are connected to each other by bolting.

According to a second aspect of the present invention, there is provided the viscoelastic structure according to the first aspect, wherein one inner steel plate as a second steel plate is sandwiched between two outer steel plates as a first steel plate. It is applied when a wall is used, and the lower end of the outer steel plate is fixed to the lower beam by bolting via a lower fixing hardware, and a connecting plate made of a steel material is provided on a side portion of the outer steel plate. Sandwiched between these two outer steel plates and bolted together,
The side plates of the outer steel plates of the viscoelastic walls arranged side by side are connected by the connecting plate.

According to a third aspect of the present invention, in the second aspect of the present invention, the upper fixing metal is welded to the upper beam and hangs down, and the upper fixing metal and the upper portion of the inner steel plate are sandwiched by two attachment plates. The bolt is fastened.

[0009]

1 to 3 show an embodiment of the present invention. This embodiment is applied when a viscoelastic wall is installed in a horizontally long space surrounded by columns and beams, as shown in FIG. In the case where a viscoelastic wall is installed in such a horizontally long space, it is usually usual to install one horizontally long viscoelastic wall corresponding to the size of the space, but in this case, the viscoelastic wall is large. Dimensions and heavy weight make it difficult to manufacture, transport and install.

Therefore, in the present embodiment, the aspect ratio is relatively small (about 1 in this example, that is, almost square).
Using three viscoelastic walls 10, the three viscoelastic walls 10
Are arranged side by side in the above-mentioned space, thereby reducing the size and weight of each viscoelastic wall 10 and facilitating its manufacture, transportation and installation.

However, when the viscoelastic wall 10 having a small aspect ratio as described above is used, a large moment M acts on each viscoelastic wall 10 and the viscoelastic wall 1
Another problem arises in that the required number of bolts for fastening 0 to the upper and lower beams is unrealistically large,
Some measures are indispensable.

Therefore, in the present embodiment, the side portions of the three viscoelastic walls 10 are connected to each other, thereby substantially equivalent to using one horizontally long viscoelastic wall. The moment M acting on the viscoelastic wall 10 is reduced, and the required number of bolts can be reduced. Hereinafter, the present embodiment will be described in detail.

As shown in FIG. 2, each viscoelastic wall 10 in the present embodiment comprises two outer steel plates (first steel plates) 11 and one inner steel plate (second steel plates) as in the prior art. 12) are laminated, and a viscoelastic body 13 such as asphalt is sandwiched between them by an adhesive. The outer steel plate 11 is fixed to a lower beam 15a via a lower fixing hardware 14. The inner steel plate 12 is connected to the upper beam 1 via the upper fixing hardware 16.
5b.

The lower fixing metal 14 is made of a steel material having an inverted T-shaped cross section having a web 14a and a flange 14b.
The web 14a is sandwiched between the two outer steel plates 11 and fastened by bolts 17, and the flange 14b is fastened by bolts 18 to the upper surface of the beam 15a. 14 through the beam 15a
Fixed against. In this case, the lower fixing hardware 14
Bolt 18 that fastens to the beam 15a withstands the moment M (tensile force for peeling the lower fixing metal 14 from the beam 15a) acting on the outer steel plate 11 due to its axial strength. The required number increases as the viscoelastic wall 10 has a smaller aspect ratio, but in this embodiment, although the individual viscoelastic walls 10 have a smaller aspect ratio, their outer steel plates 11 are connected to each other and as a whole, The required number of the bolts 18 can be sufficiently reduced because they have a horizontally long aspect ratio.

On the other hand, the upper fixing hardware 16 is
The upper fixed metal member 16 and the upper end portion of the inner steel plate 12 are sandwiched between the two attachment plates 19 and fastened by bolts 20 by being made of a flat plate-shaped steel material which is welded and hung to the lower surface of b. The upper part of the inner steel plate 12 is fixed to the upper beam 15b. The upper fixing hardware 16 is a beam 15b.
Therefore, it is possible to naturally withstand the moment M acting on the inner steel plate 12 by the fixing force due to the welding.

As shown in FIGS. 1 and 3, a connecting plate 21 is disposed between the adjacent viscoelastic walls 10 so as to straddle them, and the outer steel plates 11 on both viscoelastic walls 10 are connected to each other. They are connected to each other by a connection plate 21. The connecting plate 21 is made of a steel material in the form of a thick band plate, and both sides are sandwiched between two outer steel plates 11 and fastened by bolts 22.

As described above, the outer steel plates 11 of the three viscoelastic walls 10 are substantially integrated, and the aspect ratio thereof becomes substantially as large as about 3, whereby the moment M acting on each outer steel plate 11 is reduced. As a result, the required number of the bolts 18 for finally fastening the outer steel plate 11 to the beam 15a can be significantly reduced. It is not necessary to connect the inner steel plates 12 to each other because the upper fixing hardware 16 welded to the beam 15b can naturally resist the moment M acting on the inner steel plates 12.

According to the above-described structure, the viscoelastic wall 10 can be made small and light by adopting a small aspect ratio as the viscoelastic wall 10 and the workability can be improved.
The reduction of the moment M by connecting the viscoelastic walls 10 to each other and the substantial reduction in the required number of bolts 18 can be realized at the same time.

As shown in FIG. 4, each viscoelastic wall 10
The connecting plates 21 may be attached in advance, and the connecting plates may be fastened to each other by bolts 24 via the attachment plate 23. In such a case, not only the same effects as described above can be obtained, but also the on-site assembly can be more easily performed.

The present invention can be applied not only to the viscoelastic wall 10 composed of three steel plates as described above but also to a viscoelastic wall composed of a larger number of steel plates. And the lower fixing hardware 14 according to the form of the viscoelastic wall.
Also, the form of the upper fixing hardware 16 can be arbitrarily changed. Finally, the inner steel plate 12 is also bolted to the beam 15b.
When the outer steel plate 11 is fixed to the beam 15a by final welding, it is not necessary to connect the inner steel plate 12 to each other. In short, when a steel plate with a small aspect ratio is bolted to a beam, the adjacent steel plates are connected to each other to substantially increase the aspect ratio, thereby reducing the moment M acting on each steel plate. What is necessary is just to reduce the fastening force required for the bolt. Needless to say, the form of connection between the steel plates is not limited to the use of the above-described connection plate 21, and appropriate changes can be made as long as the steel plates can be connected with a desired strength and substantially integrated.

[0021]

According to the first aspect of the present invention, since a plurality of viscoelastic walls are juxtaposed and the side portions of the steel plate fixed by bolting are connected to each other, the aspect ratio of each viscoelastic wall is small. Even so, the aspect ratio becomes large as a whole, so that the moment acting on those steel plates can be reduced, and the required number of bolts for fastening those steel plates to the beam can be greatly reduced. . This makes it possible to use a viscoelastic wall with a small aspect ratio, and realize a small and lightweight viscoelastic wall.
It is possible to improve workability and design flexibility.

The invention according to claim 2 is applied to a viscoelastic wall composed of two outer steel plates and one inner steel plate, and the lower end of the outer steel plate is connected to the lower beam via a lower fixing metal. Since the side portions of the outer steel plates are connected to each other by the connection plate while being fixed by the bolts, the bolts to the beams of the outer steel plates and the connection between the outer steel plates can be reliably and easily performed.

According to a third aspect of the present invention, since the upper fixing metal is welded to the upper beam and the upper fixing metal and the upper portion of the inner steel plate are sandwiched and bolted by two attachment plates, the beam of the inner steel plate is used. It is possible to securely and easily fix the inner steel plates, and since the moment acting on the inner steel plates can be sufficiently secured by the adhesion force by welding, it is not necessary to connect the inner steel plates.

[Brief description of the drawings]

FIG. 1 is an elevational view showing an embodiment of an installation structure of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view showing another embodiment of the installation structure of the present invention.

FIG. 5 is a perspective view showing a conventional example of an installation structure of a viscoelastic wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Viscoelastic wall 11 Outer steel plate (1st steel plate) 12 Inner steel plate (2nd steel plate) 13 Viscoelastic body 14 Lower fixed hardware 15a, 15b Beam 16 Upper fixed hardware 18 Bolt 19 Base plate 21 Connecting plate

Claims (3)

[Claims] A viscoelastic body is bonded between a first steel plate fixed to a lower beam and rising and a second steel plate fixed to an upper beam and falling. Visco-elastic walls are installed between the upper and lower beams so that the respective steel plates are relatively displaced in the plane by the interlayer displacement of the building to obtain a damping effect by viscous resistance of the visco-elastic body. A plurality of the viscoelastic walls are arranged in parallel between the upper and lower beams, and a first steel plate and a second
A viscoelastic wall, wherein at least one of the steel plates is fixed to the beam by bolting, and the steel plates fixed by bolting of each viscoelastic wall are connected to each other by bolting. Construction. 2. A lower end of the outer steel plate using a viscoelastic wall having a configuration in which one inner steel plate as the second steel plate is sandwiched between two outer steel plates as the first steel plate. The part is fixed to the lower beam by bolting through a lower fixing hardware, and a connecting plate made of a steel material is sandwiched between the two outer steel plates on the side of the outer steel plate and bolted. The viscoelastic wall installation structure according to claim 1, wherein the side plates of the outer steel plates of the viscoelastic walls arranged side by side are connected by the connecting plate. 3. The method according to claim 1, wherein the upper fixing metal is welded to the upper beam and is suspended therefrom, and the upper fixing metal and the upper portion of the inner steel plate are bolted by being sandwiched between two attachment plates. 2. The installation structure of the viscoelastic wall according to 2.