JP2011256577A - Seismic control structure including viscoelastic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost as well as place restriction for installation by achieving compactification and to improve the performance of a damper by enhancing rigidity of an attachment part.SOLUTION: A viscoelastic damper 1 with viscoelastic bodies 7 sandwiched between a plurality of steel plates 6 arranged in parallel with one another is provided between an upper beam 3A and a lower beam 3B. The viscoelastic damper 1 comprises five steel plates 6 arranged in parallel with one another and the viscoelastic bodies 7 sandwiched between the steel plates 6, and is secured to both of reinforced-concrete RC stubs 4A, 4B provided on the upper beam 3A and the lower beam 3B respectively so that the steel plates 6 are alternately fixed by rigid connection.

Description

  The present invention relates to a vibration control structure provided with a viscoelastic damper.

Conventionally, there are a wall type, a brace type, a boundary beam type, a stud type, and the like as a type of a damping damper incorporated in a building, and the damping device uses a steel material (very soft steel LY100 or mild steel LY225) or a viscoelastic body. Is common. Among them, the viscoelastic damper has a large capacity and excellent energy absorption. In addition, by optimizing the thickness of the viscoelastic body, it is also effective in improving the comfortability against wind vibration.
On the other hand, the H steel type boundary beam damper using the bottom yield point steel has excellent performance with a large degree of freedom in a plan and a damping effect (see, for example, Patent Document 1).

  In Patent Document 1, it is formed between a pair of pillars of a building, and has a lower support means and an upper support means on the building wall, an opening in the upper part, and a lower support means in the lower support means via a lower fixing means. A fixed box, a resistance plate fixed to the support means via the upper fixing means at the upper part, and a box and the box, arranged in the box with a gap with respect to the box A damping wall having a configuration including a viscous body filled in a gap between a resistance plate and the resistance plate is disclosed.

Japanese Patent No. 394277

However, the conventional viscoelastic damper has the following problems.
That is, in Patent Document 1, when a viscoelastic damper is incorporated into an ultra high-rise or high-rise RC apartment house, the installation location is limited due to the large size of the viscoelastic damper for obtaining effective damping force. Moreover, since a large steel material is used for joining the frame and the viscoelastic damper, the bolts and the like are loosened while the damping operation is repeated, and the damper performance may be reduced.
In addition, since a large steel material is required at the joint between the viscoelastic damper and the RC frame, there is a problem that the cost increases.

The present invention has been made in view of the above-described problems, and provides a vibration control structure including a viscoelastic damper capable of reducing cost and reducing the restriction on the installation position by making it compact. The purpose is to do.
Another object of the present invention is to provide a vibration control structure including a viscoelastic damper capable of improving the damper performance by increasing the rigidity of the mounting portion.

  In order to achieve the above object, in the vibration control structure including the viscoelastic damper according to the present invention, a viscoelastic damper having a viscoelastic body sandwiched between a plurality of steel plates arranged in parallel is provided between two members. The viscoelastic damper is a seismic control structure, and the viscoelastic damper is composed of five or more steel plates arranged in parallel to each other and a viscoelastic body sandwiched between these steel plates, and is provided in each of the two members. It is characterized in that the steel plates are alternately fixed by rigid joints to both of the protrusions made of metal.

In the present invention, the viscoelastic body is sandwiched between five or more steel plates, so that the viscoelastic body becomes four or more layers, and the viscoelastic damper is formed in multiple layers, thereby reducing the capacity without reducing the capacity. It is possible to reduce (area seen from the front). And since the shape of the protrusion made from a reinforced concrete provided in the attachment part of a viscoelastic damper can also be made small, the steel material quantity used for the attachment part can be reduced. In addition, by making the projecting body made of precast concrete, there is an advantage that the construction efficiency at the site can be improved. Therefore, the viscoelastic damper can be employed at a relatively low cost even in the case of a building having a high floor.
Moreover, since the rigidity of the attachment part of the steel plate and protrusion body of a viscoelastic damper is improved, compared with the case of joining by steel materials, generation | occurrence | production of a slack is suppressed and a damper performance can be aimed at.
In addition, by adjusting the thickness of the multiple viscoelastic bodies as appropriate, the vibration energy acting on the building can be effectively changed from small deformation caused by wind or small-scale earthquakes to large deformation caused by large-scale earthquakes. It is possible to absorb and control the vibration, thereby realizing a viscoelastic damper effective for improving the comfort.

In the vibration control structure including the viscoelastic damper according to the present invention, it is more effective that the viscoelastic damper is a boundary beam damper that connects a seismic wall provided in a building and a column.
That is, it is possible to realize a boundary beam damper capable of generating a damping force from minute deformation by a viscoelastic damper having a multi-layered viscoelastic body.

Further, in the vibration control structure including the viscoelastic damper according to the present invention, a viscoelastic damper composed of a combination of five or more steel plates and a viscoelastic body is provided between the pair of protrusions and the steel plate and the viscoelastic body. A plurality of sets may be arranged in the stacking direction.
In this case, it can be applied when the length dimension in the stacking direction of the steel plate and the viscoelastic body in the two members is large, and the damper performance can be further improved by arranging a plurality of sets of viscoelastic body dampers. Is possible.

According to the vibration control structure provided with the viscoelastic damper of the present invention, the area of the viscoelastic damper as viewed from the front is reduced by forming the viscoelastic damper in multiple layers. It is possible to reduce the shape of the projecting body provided, eliminating the need for a large steel material used for the mounting part as in the past, which can reduce costs and reduce the installation position by making the viscoelastic damper compact. Restrictions can be reduced.
Moreover, the rigidity of this attachment part can be improved by making the attachment part of a viscoelastic damper into the protrusion made from reinforced concrete, and this can improve damper performance.

It is an elevational view showing a vibration control structure according to the first embodiment of the present invention. It is the sectional view on the AA line shown in FIG. It is a perspective view which shows the damping structure by 2nd Embodiment. FIG. 4 is an elevation view of the vibration control structure shown in FIG. 3. FIG. 5 is a sectional view taken along line B-B shown in FIG. 4. It is a longitudinal cross-sectional view of the damping structure by 3rd Embodiment, Comprising: It is a figure corresponding to FIG. It is a longitudinal cross-sectional view of the damping structure by 4th Embodiment, Comprising: It is a figure corresponding to FIG.

Hereinafter, a damping structure provided with a viscoelastic damper according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1 and FIG. 2, the vibration control structure according to the first embodiment is provided in a frame plane R surrounded by columns 2 and 2 and beams 3 (upper beam 3A and lower beam 3B) of the building. It is provided with a viscoelastic damper 1 that reduces or attenuates vibration energy such as earthquakes and winds that are installed and act on buildings.

  That is, the viscoelastic damper 1 includes a reinforced concrete stub (hereinafter referred to as “RC stub 4 (4A, 4B”)) provided on each of the upper beam 3A and the lower beam 3B, and a pair of RC stubs 4A, 4B. A plurality of substrates (5A, 5B) that are fixed and a plurality of substrates (5A, 5B) that are alternately arranged with respect to the substrates 5A, 5B that are arranged in parallel in a direction perpendicular to the frame surface R and that are vertically opposed to each other. Here, five steel plates 6 (61 to 65) and a viscoelastic body 7 sandwiched between the steel plates 6 and 6 are schematically configured. This corresponds to the concrete protrusion of the invention.

  The RC stubs 4A and 4B each have a block shape larger than the width dimension of the steel plate 6 and the viscoelastic body 7 (corresponding to the left and right direction in the front view of FIG. 1), and are integrated with the upper and lower beams 3A and 3B. Provided. Specifically, the RC stub 4 may be constructed by concrete placement at the same time as the beam 3, or manufactured in advance as precast concrete and joined to the beam 3 on-site by an appropriate joining means. good.

  The substrates 5A and 5B are flat members, and are members that are interposed to join the plurality of steel plates 6 to the RC stub 4, and are fixed to the RC stub 4 by bolts, anchors, or the like (not shown). And as above-mentioned, the steel plate 6 is being fixed to the surface 5a of the mutually opposing side surface of the board | substrate 5A, 5B by joining means, such as welding. That is, a lower end 6a of a pair of steel plates 6 and 6 arranged at a constant interval is fixed to the lower substrate 5A. On the other hand, upper ends 6b of three steel plates 6 arranged at a constant interval are fixed to the upper substrate 5B.

  The steel plates 6 have a predetermined thickness dimension, and in the present embodiment, each of the five sheets is arranged in a state where the viscoelastic bodies 7 are sandwiched. Out of these five sheets, the upper ends 6a of both ends and the central steel plates (referred to as first steel plates 61, 62, 63) are joined to the upper substrate 5A. And the lower end 6b of the steel plate (it is set as the 2nd steel plates 64 and 65) arrange | positioned between each of these 1st steel plates 61, 62, 63 is joined to the lower board | substrate 5B. That is, the first steel plates 6 (61, 62, 63) fixed to the upper beam 3A side and the second steel plates 64, 65 fixed to the lower beam 3B side are alternately laminated in parallel, The viscoelastic body 7 is sandwiched between the two.

  The viscoelastic body 7 is provided in a range where the first steel plates 61 to 63 and the second steel plates 64 and 65 overlap each other. For example, a member such as a rubber material or a resin material can be employed, Alternatively, different members may be used.

  The viscoelastic damper 1 is provided with an appropriate number of communication holes (not shown) penetrating in the thickness direction. Bolts are inserted into the communication holes, and nuts are screwed together to tighten the plurality of steel plates. 6 (61-65) and the viscoelastic bodies 7 are connected to each other with a predetermined frictional force.

Next, the effect | action of the damping structure provided with the viscoelastic damper comprised in this way is demonstrated based on drawing.
As shown in FIGS. 1 and 2, in the present damping structure, a viscoelastic body 7 is formed by sandwiching a viscoelastic body 7 between the steel plates 6, 6, resulting in a viscoelastic damper 7. By multiplying 1 into multiple layers, it is possible to reduce the found area (area seen from the front) without reducing the capacity. And since the shape of RC stub 4 provided in the attaching part of viscoelastic damper 1 can also be made small, the steel material quantity used for the attaching part can be reduced.
In addition, by making the RC stub 4 made of precast concrete, there is an advantage that the efficiency of construction on site can be improved. Therefore, the viscoelastic damper can be employed at a relatively low cost even in the case of a building having a high floor.

Moreover, since the rigidity of the attachment part of the steel plate 6 and the RC stub 4 of the viscoelastic damper 1 is enhanced, the occurrence of loosening is suppressed and the damper performance is improved compared to the case of joining by steel materials. Can do.
Furthermore, by appropriately adjusting the thicknesses of the plurality of viscoelastic bodies 7, 7,..., It is possible to effectively deform from a small deformation due to a wind or a small earthquake to a large deformation due to a large earthquake. The vibration energy which acts can be absorbed and it can control, and this can implement the viscoelastic damper 1 effective for amenity improvement.

As described above, in the vibration control structure including the viscoelastic damper according to the first embodiment, the viscoelastic damper 1 as viewed from the front is reduced in area by forming the viscoelastic damper 1 in multiple layers. Therefore, the shape of the RC stub 4 provided in the attachment portion of the viscoelastic damper 1 can be reduced, and a large steel material used for the attachment portion is not required as in the prior art, so that the cost can be reduced. The restriction of the installation position can be reduced by making the viscoelastic damper 1 compact.
Moreover, the rigidity of this attachment part is improved by making the attachment part of the viscoelastic damper 1 into the RC stub 4, and this can improve damper performance.

  Next, another embodiment of the present invention will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described first embodiment are denoted by the same reference numerals and description thereof is omitted. A configuration different from the first embodiment will be described.

As shown in FIG. 3, the damping structure according to the second embodiment enables a damping force to be generated from minute deformation by replacing the steel material of the boundary beam damper with a viscoelastic damper 1A. .
Here, reference numerals 2A and 2B in FIGS. 3 to 5 indicate the first pillar and the second pillar, respectively, and reference numeral 8 indicates the earthquake-resistant wall disposed at a predetermined interval between both pillars 2A and 2B. Yes. The first pillar 2A, the second pillar 2B, and the earthquake-resistant wall 8 are made of reinforced concrete.

  As shown in FIGS. 3 and 4, the present vibration control structure has a material axis direction (attenuation direction) between each of the first pillar 2 </ b> A and the second pillar 2 </ b> B and the earthquake-resistant wall 8 so as to be connected to each other. A viscoelastic damper 1A oriented in the horizontal direction is provided. The viscoelastic damper 1A has a configuration in which RC beams 9 (projections made of reinforced concrete) are provided at both ends.

  Specifically, as shown in FIG. 5, the viscoelastic damper 1 </ b> A includes a plurality (three) of first steel plates 6 (61, 62, 63) fixed to the earthquake-resistant wall 8 side and the first pillar 2 </ b> A side. A plurality (two) of second steel plates 64 and 65 to be fixed are alternately stacked in parallel with the first steel plates 61, 62, and 63 arranged on the outside, and between the steel plates 6 and 6. The viscoelastic body 7 is sandwiched between the two. The viscoelastic damper 1A in which the steel plate 6 and the viscoelastic body 7 are laminated is provided with an appropriate number of communication holes (not shown) penetrating in the thickness direction. Bolts are inserted into the communication holes and nuts are inserted. These steel plates 6 and viscoelastic bodies 7 are connected to each other with a predetermined frictional force.

  In the second embodiment, an effect similar to that of the first embodiment described above can be obtained, and an effective boundary beam damper can be realized with respect to wind vibration that is a minute deformation compared to seismic force. it can.

Next, as shown in FIG. 6, the damping structure according to the third embodiment is a viscoelastic damper composed of a combination of the five steel plates 6 and the viscoelastic body 7 according to the first embodiment. 1 is a pair of RC stubs 4C, 4D (protrusions), and viscoelastic damper 1 composed of a combination of five steel plates 6, 6,... And viscoelastic bodies 7, 7,. A plurality of sets (two sets here) are arranged in the stacking direction with the body 7 (the direction of the arrow X). Here, the RC stubs 4C and 4D have the length dimension in the stacking direction X of the RC stubs 4A and 4B (see FIG. 2) according to the first embodiment being approximately twice as large.
In this case, the present invention can be applied when the length dimension of the upper beam 3A and the lower beam 3B in the stacking direction X is large, and the damper performance can be further improved by arranging two sets of viscoelastic dampers 1 and 1. It is possible to increase.

Next, as shown in FIG. 7, the damping structure according to the fourth embodiment is a viscoelastic damper made of a combination of the five steel plates 6 and the viscoelastic body 7 according to the second embodiment. 1A is a pair of RC beams 9A, 9A (protrusions), and viscoelastic damper 1A composed of a combination of five steel plates 6, 6,... And viscoelastic bodies 7, 7,. A plurality of sets (two sets here) are arranged in the stacking direction with the body 7 (the direction of the arrow X). Here, the RC beams 9A and 9A have the length dimension in the stacking direction X of the RC beams 9 and 9 (see FIG. 5) according to the second embodiment approximately twice as large.
In the case of the vibration control structure according to the fourth embodiment, it can be applied when the length of the RC beam 9A, 9A in the stacking direction X is large, and two sets of viscoelastic dampers 1A, 1A are arranged. By doing so, it is possible to further improve the damper performance.

As mentioned above, although the 1st thru | or 4th embodiment of the damping structure provided with the viscoelastic damper by this invention was described, this invention is not limited to said embodiment, and does not deviate from the meaning. The range can be changed as appropriate.
For example, in the present embodiment, the multi-layered viscoelastic dampers 1 and 1A having five steel plates 6 are provided. However, the number of steel plates is not limited, and the main point is five or more steel plates. Any structure having the above is sufficient.
In addition, in the viscoelastic dampers 1 and 1A, the thickness dimension of the steel plate 6, the material of the viscoelastic body 7, the mounting structure of the steel plate 6 and the viscoelastic body 7, the RC stub 4 (4A to 4D) and the RC beams 9 and 9A The size and the length in the axial direction are not particularly limited and can be set as appropriate.
Moreover, the board | substrate 5 interposed between the viscoelastic dampers 1 and 1A and a protrusion (RC stub 4 or RC beam 9, 9A) can also be abbreviate | omitted.

1, 1A Viscoelastic damper 2 Column 3 Beam 4, 4A, 4B, 4C, 4D RC stub (projection)
5, 5A, 5B Substrate 6 Steel plate 7 Viscoelastic body 8 Earthquake resistant wall 9, 9A RC beam (projection)
61, 62, 63 First steel plate 64, 65 Second steel plate R Frame surface

Claims (3)

A vibration control structure comprising a viscoelastic damper between two members sandwiching a viscoelastic body between a plurality of steel plates arranged in parallel,
The viscoelastic damper is
It consists of five or more steel plates arranged in parallel to each other and a viscoelastic body sandwiched between these steel plates,
A damping structure provided with a viscoelastic damper, wherein the steel plates are alternately fixed by rigid joints to both reinforced concrete protrusions provided on each of the two members.   The said viscoelastic body damper functions as a boundary beam damper, The damping structure provided with the viscoelastic damper of Claim 1 characterized by the above-mentioned.   Between the pair of protrusions, a plurality of sets of the viscoelastic dampers made of a combination of five or more steel plates and viscoelastic bodies are arranged in the stacking direction of the steel plates and the viscoelastic bodies. The vibration control structure according to claim 1 or 2.

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