JP3831882B2 - Viscoelastic wall installation structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for installing in a building a viscoelastic wall having a structure in which a viscoelastic body is sandwiched between steel plates.
[0002]
[Prior art]
In recent years, viscoelastic walls installed as damping dampers in buildings have been developed and put into practical use. This is installed as a wall between the upper and lower beams 1a and 1b as shown in FIG. 5, and is a single steel plate (inner steel plate) 2a that is fixed to the upper beam 1a and falls, A viscoelastic body 3 such as asphalt is sandwiched between two steel plates (outer steel plates) 2b that are fixed to the beam 1b and rise, and both steel plates 2a when the building is displaced between layers during an earthquake. 2b is relatively displaced in the plane, and the vibrational energy is absorbed by the viscous resistance force of the viscoelastic body 3 generated at that time to attenuate the vibration of the building.
[0003]
In order to install such a viscoelastic wall between the upper and lower beams 1a and 1b, as shown in FIG. 5, a fixed hardware 4 having an inverted T-shaped cross section is bolted to the lower end of the outer steel plate 2b in advance. It is bolted to the upper flange of the lower beam 1b, and a horizontal fixing plate 5 is welded to the upper end of the inner steel plate 2a in advance and bolted to the lower flange of the upper beam 1a. In general, a structure is used.
[0004]
[Problems to be solved by the invention]
By the way, a large shearing force Q and moment M act on the viscoelastic wall as described above due to the interlayer displacement of the building, and the bolts that fasten the viscoelastic wall to the beams 1a and 1b are naturally used. Furthermore, it must be able to withstand such shear force Q and moment M. In this case, the moment M acts so as to peel off the fixed hardware 4 and the fixed plate 5 from the beams 1a and 1b, but the axial tensile strength of the bolts fastening them is compared with the radial shear strength. Since it is normal to be inferior, the required number of bolts is determined by the moment M. The moment M acting on the viscoelastic wall becomes larger as the aspect ratio W / H of the viscoelastic wall becomes smaller, that is, as it becomes a vertically long shape, and the required number of bolts increases accordingly, and the aspect ratio becomes about 1 or more ( In other words, in the case of a substantially square shape to a vertically longer shape), a large number of bolts are required as the bolt pitch is reduced to an unrealistic level. Therefore, in the past, the aspect ratio is about 2-3. A horizontally long viscoelastic wall had to be adopted.
[0005]
In view of the above circumstances, the present invention makes it possible to fix a steel plate to a beam in a form that can sufficiently resist the moment acting on the steel plate of the viscoelastic wall, thereby providing a viscoelastic wall with a small aspect ratio. It is an object to provide an effective viscoelastic wall installation structure that can be used.
[0006]
[Means for Solving the Problems]
In the present invention, a pair of steel plates sandwiched between viscoelastic bodies and bonded together are fixed to the upper and lower beams of the building, respectively, so that when the building undergoes interlayer displacement, each steel plate is in-plane. A structure for installing in a building a viscoelastic wall configured to obtain a damping force by a viscous resistance force of the viscoelastic body by relative displacement, and the height dimension of each steel plate extends over two layers of the building. As the upper half and the lower half of each steel plate are arranged on the upper and lower floors of the beam by fixing the center in the height direction of each steel plate to every other layer with respect to the beam, The beams to be fixed are shifted from each other by one layer so that the lower half and the upper half of both steel plates are superposed on each floor so that the viscoelastic body is sandwiched between them.
[0007]
In the present invention, one inner steel plate and two outer steel plates are used as the pair of steel plates, and the lower half and the upper half of the outer steel plate are respectively provided on both sides of the upper half and the lower half of the inner steel plate. It is preferable to overlap the parts. In that case, the central portion of the inner steel plate in the height direction is sandwiched by the inner steel plate connecting material, and the outer steel plate connecting material is sandwiched between the center portions in the height direction of the two outer steel plates, and the inner steel plate connecting material. The outer steel plate connecting material may be installed as a beam.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an embodiment of the present invention. The basic configuration of the viscoelastic wall in the present embodiment is similar to that shown in FIG. 5, with two outer steel plates 10 b superimposed on both sides of one inner steel plate 10 a and viscoelasticity such as asphalt between them. Although the body 11 is sandwiched in a bonded state, the conventional viscoelastic wall is installed on each floor, whereas in the present embodiment, a viscoelastic wall configured to straddle two layers is adopted. Yes.
[0009]
That is, the inner steel plate 10a and the outer steel plate 10b in the present embodiment both have a height dimension that extends over two layers of the building, and the center in the height direction is one layer with respect to the beams 12a and 12b. By being fixed every other time, the upper half and the lower half of the steel plates 10a and 10b are arranged on the upper and lower floors of the beams 12a and 12b, respectively. The two steel plates 10a and 10b are not fixed to the same beam, but are alternately fixed to the beams 12a and 12b shifted by one layer. Therefore, in each floor, the upper half of the inner steel plate 10a and the outer half The lower half of the steel plate 10b or the lower half of the inner steel plate 10a and the upper half of the outer steel plate 10b are overlapped, and the viscoelastic body 11 is sandwiched between them. Yes.
[0010]
The inner steel plate 10a is fixed to the beam 12a using an inner steel plate connecting material 13 as shown in FIG. The inner steel plate connecting material 13 is composed of two C-shaped steels 14. The inner steel plates 10 a are sandwiched between the C-shaped steels 14 as back-to-back, and bolts are fastened. The inner steel plate connecting material 13 itself is constructed so as to function as the beam 12a by welding to the steel plate.
[0011]
Further, the outer steel plate 10b is fixed to the beam 12b by using the outer steel plate connecting material 16 as shown in FIG. The outer steel plate connecting member 16 is composed of two plates 18 for sandwiching the web of the beam bracket 17 and a spacer 19 corresponding to the web thickness. The outer steel plate connecting member 16 is sandwiched between the two outer steel plates 10b. Then, the outer steel plate connecting material 16 is constructed so that the outer steel plate connecting material 16 itself functions as the beam 12b by bolting both ends of the outer steel plate connecting material 16 to the beam bracket 17.
[0012]
According to the above structure, both the inner steel plate 10a and the outer steel plate 10b are firmly fixed by bolt fastening to the inner steel plate connecting material 13 and the outer steel plate connecting material 16 that function as the beams 12a and 12b, and are fastened. Since the bolts are resistant to the moment M acting on the inner steel plate 10a and the outer steel plate 10b by the shear strength, a sufficient moment strength can be secured naturally, and therefore the required number of bolts can be reduced. As a result, viscoelastic walls having a small aspect ratio can also be employed.
[0013]
The viscoelastic wall is assembled on site at the time of steel frame construction, but the work is in parallel with the construction of the inner steel plate connecting material 13 and the outer steel plate connecting material 16 as the columns 15 and beams 12a and 12b. After assembling the steel plates 10a and 10b, the liquid viscoelastic body 11 is injected between the steel plates 10a and 10b, or the steel plates 10a and 10b are assembled while the sheet-like viscoelastic body 11 is sandwiched. In addition, it can be implemented at low cost.
[0014]
Further, the configurations of the inner steel plate connecting material 13 and the outer steel plate connecting material 16 can be arbitrarily changed. For example, instead of directly welding both ends of the inner steel plate connecting material 13 to the column 15, As in the case of the outer steel plate connecting material 16, the inner steel plate connecting material 13 is replaced by bolting the beam bracket 17, or conversely, by bolting both ends of the outer steel plate connecting material 16 to the beam bracket 17. Similarly, it is conceivable that the beam bracket 17 is omitted and the column 15 is directly welded. Further, when the steel plates 10a and 10b can be fastened with bolts in the beam width direction or, if possible, can be fixed in a form capable of securing a sufficient moment drag by welding or other joining means, the connecting members 13, It is not prevented that the steel plates 10a and 10b are directly fixed to the original beam by omitting 16.
[0015]
Of course, the configuration of the viscoelastic wall is not limited to one inner steel plate 10a and two outer steel plates 10b as described above, but depending on the required damping force, the number and area of each steel plate 10a, 10b, What is necessary is just to adjust the kind and thickness of the viscoelastic body 11 suitably.
[0016]
【The invention's effect】
As described above, the present invention assumes that the height dimension of each steel plate extends over two layers of the building, and the steel plate is fixed to every other layer with respect to the beam at the center in the height direction of each steel plate. Are installed on the upper and lower floors of the beam, and the beams for fixing both steel plates are shifted by one layer from each other, so that the lower half and upper half of both steel plates on each floor Since the viscoelastic body is sandwiched between them in a bonded state, it is possible to easily fix each steel plate to the beam and rationally resist the moment acting on the viscoelastic wall. As a result, in the case of bolt fastening, the required number can be sufficiently reduced, and a viscoelastic wall having a small aspect ratio can be adopted.
[0017]
In particular, one inner steel plate and two outer steel plates are used as a pair of steel plates, and the lower half and upper half of the outer steel plate are overlapped on both sides of the upper half and lower half of the inner steel plate, respectively. In that case, the center part in the height direction of the inner steel plate is sandwiched from the left and right by the two inner steel plate connecting members, and the outer steel plate is connected between the two center parts in the height direction of the two outer steel plates. If the materials are sandwiched and the inner steel plate connecting material and the outer steel plate connecting material are respectively installed as beams, the steel plates can be fixed easily and rationally.
[Brief description of the drawings]
FIG. 1 is a front 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.
3 is a sectional view taken along line III-III in FIG.
4 is a sectional view taken along line IV-IV in FIG. 1. FIG.
FIG. 5 is a view showing a conventional general viscoelastic wall installation structure.
[Explanation of symbols]
10a Inner steel plate (steel plate)
10b Outer steel plate (steel plate)
11 Viscoelastic body 12a, 12b Beam 13 Inner steel plate connecting material 16 Outer steel plate connecting material

Claims (3)

By fixing a pair of steel plates with a viscoelastic body sandwiched in an adhesive state to the upper and lower beams of the building, each steel plate is relatively displaced in the plane when the building undergoes interlayer displacement. A viscoelastic wall configured to obtain a damping force by the viscous resistance of the viscoelastic body is a structure for installing in a building,
Assuming that the height of each steel sheet extends over two layers of the building, the upper half and the lower half of each steel sheet are fixed by fixing the center in the height direction of each steel sheet to every other layer with respect to the beam. Are placed on the upper and lower floors of the beams, and the beams for fixing both steel plates are shifted by one layer from each other, so that the lower and upper half portions of both steel plates overlap each other on each floor. An installation structure of a viscoelastic wall, wherein the viscoelastic body is sandwiched in an adhesive state. One inner steel plate and two outer steel plates are used as the pair of steel plates, and the lower half and upper half of the outer steel plate are overlapped on both sides of the upper half and lower half of the inner steel plate, respectively. The viscoelastic wall installation structure according to claim 1. A central portion in the height direction of the inner steel plate is sandwiched between inner steel plate connecting materials, and an outer steel plate connecting material is sandwiched between the central portions in the height direction of the two outer steel plates. 3. The viscoelastic wall installation structure according to claim 2, wherein each of the steel plate connecting members is constructed as a beam.

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