JP3864360B2 - Viscoelastic wall installation structure - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
In recent years, viscoelastic walls that are installed in buildings as earthquake-resistant dampers have been developed and put into practical use. As shown in FIG. 8, this is installed as a wall between the upper and lower beams 1a and 1b, and is fixed to the upper beam 1a and falls on one inner steel plate 2a and the lower beam 1b. A viscoelastic body 3 such as asphalt is sandwiched between two outer steel plates 2b that are fixed and stand up, and both steel plates 2a and 2b are in-plane when the building is displaced between layers during an earthquake. The vibration of the building is attenuated by absorbing the vibration energy by the viscous resistance force of the viscoelastic body 3 generated at the relative displacement.
[0003]
In order to install such a viscoelastic wall between the upper and lower beams 1a and 1b, as shown in FIG. 8, a horizontal fixing plate 4 is previously welded to the upper end of the inner steel plate 2a. Is bolted to the lower flange of the upper beam 1a, and a T-section fixed metal fitting 5 is bolted to the lower end of the outer steel plate 2b in advance and bolted to the upper flange of the lower beam 1b. 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 naturally the bolts that fasten the viscoelastic wall to the beams 1a and 1b are used. It must be able to resist such shear force Q and moment M. In this case, since the axial tensile strength of the bolt is usually inferior to the shear strength, 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 approximately square to vertically longer), a large number of bolts are required as the bolt pitch is reduced to an unrealistic level. Therefore, in the past, a horizontally long viscoelastic wall having an aspect ratio of about 2 to 3 has to be adopted, which becomes an obstacle to design restrictions and miniaturization and weight reduction of the viscoelastic wall. Therefore, there has been a demand for an effective improvement measure that can reduce the required number of bolts.
[0005]
[Means for Solving the Problems]
In view of the above circumstances, in the present invention, a viscoelastic wall having a structure in which a viscoelastic body is sandwiched between at least a pair of steel plates is disposed between upper and lower beams, and an end of one steel plate is While fixing to one of the beams and fixing the end of the other steel plate to any one of the other beams, the steel plates are relatively displaced by the interlayer displacement of the building, and the viscosity of the viscoelastic body A viscoelastic wall installation structure in which a damping effect is obtained by a resistance force, wherein the end of the steel plate is bolted to the beam via a first fixed hardware having a length substantially over its entire width , A second fixed hardware is welded and fixed to the beam at a position close to the end of the first fixed hardware, and the second fixed hardware and the side of the steel plate are bolted, or The first fixed hardware that is longer than the full width of the end of the steel plate Then, a bolt is fastened to the beam, and a second fixed hardware is welded and fixed to the beam at a position close to the end of the first fixed hardware, and the second fixed hardware and the first The end of the fixed hardware is bolted through an attachment plate.
[0006]
In the present invention, a steel material having a T-shaped cross section having a web and a flange may be used as the first fixed metal, and the web may be bolted to the end of the steel plate and the flange may be bolted to the beam. Further, a rod-like or strip-like steel material is used as the second fixed metal, and the base end of the second fixed metal is positioned at a position where the second fixed metal is attached to the side of the steel plate or the end of the first fixed metal. What is necessary is just to weld and fix a part to a beam.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied when the lower end portion of the viscoelastic wall having the configuration shown in FIG. 8 is fixed to the lower beam 1b will be described.
[0008]
1 to 3 show a first embodiment, which is basically based on fixing a lower end portion of a viscoelastic wall to a beam 1b through a first fixed hardware 10. FIG. The first fixed hardware 10 is made of a steel material having a T-shaped cross section having a web 10a and a flange 10b in the same manner as the fixed metal 5 in the one shown in FIG. The flange 10b is brought into close contact with the flange of the beam 1b and is bolted.
[0009]
The above configuration is the same as that of the conventional case shown in FIG. 8 except that the total length of the first fixed hardware 10 is slightly shorter than the total width of the outer steel plate 2b, and the shear acting on the viscoelastic wall. Basically, the force Q can be sufficiently resisted by the bolt fastening force with respect to the first fixed hardware 10, but in addition to the above configuration, in the first embodiment, both end portions of the first fixed hardware 10. The second fixed hardware 11 made of a thick bar-shaped or strip-shaped steel material is fixed by welding its lower end to the flange of the beam 1b, and the second fixed hardware 11 is The both ends of the lower end portion of the outer steel plate 2b are bolted directly to the second fixed hardware 11 while being sandwiched between the two outer steel plates 2b.
[0010]
As described above, by fixing the second fixed metal 11 to the beam 1b by welding, the fixing force by the welding becomes much larger than the bolt fastening force. The fixed hardware 11 can sufficiently resist the moment M acting on the viscoelastic wall, and accordingly, the required number of bolts for fastening the first fixed hardware 10 to the beam 1b is reduced. be able to. For this reason, even when the aspect ratio of the viscoelastic wall is about 1 or smaller, the number of bolts can be kept to a practical level. An elastic wall can be realized. As a result, design restrictions can be eliminated, and the viscoelastic wall can be reduced in size and weight.
[0011]
As a work procedure in the above case, the first fixed hardware 10 is attached to the viscoelastic wall in advance, and the second fixed hardware 11 is previously welded to the beam 1b, and the second fixed hardware 11 is attached to the second fixed hardware 11. What is necessary is just to build a viscoelastic wall so that it may be inserted and to bolt them. Alternatively, as another procedure, if possible, the second fixed metal 11 is attached to the viscoelastic wall in advance, and after the viscoelastic wall is built, the lower end of the second fixed metal is welded to the beam 1b. Also good.
[0012]
4 to 6 show a second embodiment. In the first embodiment, the second fixed hardware 11 is directly fastened to the outer steel plate 2b. In the second embodiment, the second fixed hardware 21 is fastened to the first fixed hardware 20. I am doing so. That is, in the second embodiment, the total length of the first fixed hardware 20 is made slightly longer than the overall width of the outer steel plate 2b, and the rising portions 20c are formed at both ends of the web 20a, and the standing The raised portion 20c is exposed to the outside of the outer steel plate 2b, and the raised portion 20c and the second fixed hardware 21 are bolted through the accessory plate 22.
[0013]
In the second embodiment, the outer steel plate 2b is indirectly fastened to the second fixed hardware 21 via the first fixed hardware 20 and the accessory plate 22, but the second fixed hardware 21 is welded. Accordingly, the resistance against the moment M acting on the outer steel plate 2b due to the fixing force by the welding is exerted similarly to the case of the first embodiment.
[0014]
In addition, as a work procedure in this case, the first fixed hardware 20 is attached to the viscoelastic wall in advance, and the second fixed hardware 21 is previously welded to the beam 1b, and the second fixed hardware 21 is attached. A viscoelastic wall may be disposed between the second fixed hardware 21 and each raised portion 20c of the first fixed hardware 20 via the attachment plate 22, and therefore, in the case of the first embodiment. Compared to the above, the viscoelastic wall can be built more easily.
[0015]
The structure of the present invention can be applied not only to viscoelastic walls made of three steel plates as in the above embodiment, but also to viscoelastic walls made of a larger number of steel plates. . Then, the shapes and dimensions of the first and second fixed hardware, their installation positions, and the like may be changed as appropriate in accordance with the shape and dimensions of the target viscoelastic wall. The point is that the second fixed hardware can be welded to the beam instead of bolting so that a sufficient moment drag can be exerted. For example, as shown in FIGS. When the second fixed hardware 21 is provided close to the column 30, it is conceivable to weld it to the column 30.
[0016]
Moreover, although the said embodiment is a thing when fixing the lower end part of the outer steel plate 2b to the lower beam 1b, the upper end part of the inner steel plate 2a is made into the upper beam 1a by reversing the top and bottom of the said structure. The present invention can be similarly applied to the case of fixing. However, when one inner steel plate 2a is fixed to the beam 1a, the fixing metal 40 perpendicular to the flange of the upper beam 1a is welded, for example, as shown in FIG. Sufficient moment resistance can be ensured by hanging down and fastening the inner steel plate 2 a to the fixed hardware 40 via the two attached plates 41. However, adopting the structure shown in FIG. 7 as a structure for fixing the lower ends of the two outer steel plates 2b to the lower beam 1b makes it difficult to build a viscoelastic wall. It is not practical, and it is optimal that at least the lower end of the outer steel plate 2b is fixed according to the present invention.
[0017]
【The invention's effect】
According to the present invention, the end portion of the steel plate is bolted to the beam via the first fixed hardware having a length substantially over the entire width, and the end portion of the steel plate is positioned close to the end portion of the first fixed hardware. The second fixed hardware is welded and fixed to the beam, and the side of the steel plate is bolted to the second fixed hardware , or the end of the steel plate is longer than its full width. The second fixed hardware is welded to the beam and fixed at a position close to the end of the first fixed hardware, and the second fixed hardware and the first Since the end of the fixed hardware is bolted through the attachment plate, the second fixed hardware can sufficiently resist the moment acting on the viscoelastic wall.
Therefore, according to the present invention, the required number of bolts can be reduced. As a result, even when the aspect ratio of the viscoelastic wall is small, the number of bolts can be kept to a practical level. Can achieve a viscoelastic wall with a small aspect ratio, which was impossible, and eliminates design restrictions, and enables the viscoelastic wall to be made smaller and lighter. .
Further, if a steel material having a T-shaped cross section having a web and a flange is used as the first fixed metal, and the web is bolted to the end of the steel plate and the flange is bolted to the beam, the first fixed metal for the steel plate and the beam Can be easily and reliably performed.
Also, if a rod-like or strip-like steel material is used as the second fixed hardware, and the base end is welded and fixed to the beam at a position along the side of the steel plate or the end of the first fixed hardware. The second fixed hardware can exhibit the moment drag most efficiently.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.
FIG. 2 is an elevational sectional view of the same.
FIG. 3 is a partial plan view of the same.
FIG. 4 is an exploded perspective view showing a second embodiment of the present invention.
FIG. 5 is an elevational sectional view of the same.
FIG. 6 is a partial plan view of the same.
FIG. 7 is a diagram showing an example of another structure for fixing a steel plate end to a beam.
FIG. 8 is a perspective view showing a conventional example of a viscoelastic wall installation structure.
[Explanation of symbols]
1a, 1b Beams 2a, 2b Steel plate 3 Viscoelastic body 10 First fixed hardware 10a Web 10b Flange 11 Second fixed hardware 20 First fixed hardware 20a Web 20b Flange 20c Rising part 21 Second fixed hardware 22 Attached plate

Claims (4)

A viscoelastic wall with a viscoelastic body sandwiched between at least a pair of steel plates is placed between the upper and lower beams, and the end of one steel plate is fixed to one of the upper and lower beams. At the same time, by fixing the end of the other steel plate to one of the other beams, the steel plate is relatively displaced by the interlayer displacement of the building so as to obtain a damping effect by the viscous resistance force of the viscoelastic body. A viscoelastic wall installation structure,
The end of the steel plate is bolted to the beam via the first fixed hardware having a length substantially over the entire width, and the second fixed hardware is placed at a position close to the end of the first fixed hardware. An installation structure of a viscoelastic wall, wherein the second fixed hardware and a side portion of the steel plate are bolted to each other by welding to a beam. A viscoelastic wall with a viscoelastic body sandwiched between at least a pair of steel plates is placed between the upper and lower beams, and the end of one steel plate is fixed to one of the upper and lower beams. At the same time, by fixing the end of the other steel plate to one of the other beams, the steel plate is relatively displaced by the interlayer displacement of the building so as to obtain a damping effect by the viscous resistance force of the viscoelastic body. A viscoelastic wall installation structure,
The end of the steel plate is bolted to the beam via the first fixed hardware longer than the entire width thereof, and the second fixed hardware is used as a beam at a position close to the end of the first fixed hardware. An installation structure of a viscoelastic wall, wherein the second fixed hardware and the end of the first fixed hardware are bolted together via an attachment plate after being fixed by welding. With steel T-shaped cross-section having a web and flanges as the first fixing hardware, according to claim 1 or 2, wherein the bolt fastening the bolt and the flange on the beam to the steel plate end the web Installation structure of viscoelastic wall. A rod-like or strip-like steel material is used as the second fixed hardware, and the base end of the second fixed hardware is positioned at the side of the steel plate or the end of the first fixed hardware. The viscoelastic wall installation structure according to any one of claims 1 to 3, wherein the viscoelastic wall is fixed by welding.

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