JP2011208479A - Base isolation structure - Google Patents

Base isolation structure Download PDF

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JP2011208479A
JP2011208479A JP2010079662A JP2010079662A JP2011208479A JP 2011208479 A JP2011208479 A JP 2011208479A JP 2010079662 A JP2010079662 A JP 2010079662A JP 2010079662 A JP2010079662 A JP 2010079662A JP 2011208479 A JP2011208479 A JP 2011208479A
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seismic isolation
main body
base
structure main
isolation device
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JP5565679B2 (en
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Hideo Nakajima
秀雄 中島
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a low-cost base isolation structure which reduces or prevents rocking vibrations of a structure.SOLUTION: In the base isolation structure 10 provided with a base isolating device 14 supporting the weight of a structure body 12, the base isolating device 14 is arranged at the height position where an overturning moment applied to the structure body 12 by an earthquake force is reduced. The base isolation structure 10 further includes a base part 16 arranged adjacently to the structure body 12 from a supporting foundation 20 to a middle height of the structure body 12 in a manner that it does not come into direct contact with the structure body 12. The base isolating device 14 is arranged between the structure body 12 and the base part 16.

Description

本発明は、免震構造物に関するものである。   The present invention relates to a seismic isolation structure.

従来、構造物を上下方向に免震支持する免震装置（上下・水平両方向の３次元免震を含む）は、上下方向に変形し易いために構造物全体のロッキング振動を起こし易いことが問題となっている。図３に示すように、このロッキング振動は、地震力による転倒モーメントによって引き起こされるものである。特に、構造物１の高さと幅の比（アスペクト比）が大きい免震構造物はこのロッキング振動による浮き上がりの影響を受け易く、免震装置２に大きな引張力が作用することが問題となる。このような問題に対し、構造物の浮き上がり量を制限するためのロッキング防止装置を別途設け、ロッキング振動を抑制することが知られている（例えば、特許文献１および非特許文献１参照）。   Conventionally, seismic isolation devices (including 3D seismic isolation in both the vertical and horizontal directions) that support the structure in the vertical direction are susceptible to rocking vibration of the entire structure because they are easily deformed in the vertical direction. It has become. As shown in FIG. 3, this rocking vibration is caused by a falling moment due to seismic force. In particular, a seismic isolation structure having a large height / width ratio (aspect ratio) of the structure 1 is easily affected by lifting due to this rocking vibration, and a large tensile force acts on the seismic isolation device 2. In order to solve such a problem, it is known to separately provide a locking prevention device for limiting the amount of floating of the structure to suppress the rocking vibration (see, for example, Patent Document 1 and Non-Patent Document 1).

特許第３８５６６０７号公報Japanese Patent No. 3856607

「３次元免震建物の開発：その３ ロッキング抑制装置付オイルダンパーの解析と実験」、露木保男、高橋治、會田裕昌、藤田隆史、山本康裕、社団法人日本建築学会大会学術講演梗概集、２００８年９月、ｐ．４３９〜４４０“Development of three-dimensional seismic isolation building: Part 3 Analysis and experiment of oil damper with rocking restraint device”, Yasuo Tsuki, Osamu Takahashi, Hiromasa Hirota, Takashi Fujita, Yasuhiro Yamamoto, Abstracts of Annual Conference of Architectural Institute of Japan, 2008 September, p. 439-440

ところで、上記の従来の特許文献１のように、ロッキング振動を抑制するために別途ロッキング防止装置を設けるとコストアップを招いてしまう。   By the way, as in the above-described conventional patent document 1, if a separate locking prevention device is provided in order to suppress the rocking vibration, the cost increases.

本発明は、上記に鑑みてなされたものであって、構造物のロッキング振動を抑制ないし防止することができる低コストの免震構造物を提供することを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at providing the low-cost seismic isolation structure which can suppress thru | or prevent the rocking vibration of a structure.

上記した課題を解決し、目的を達成するために、本発明の請求項１に係る免震構造物は、構造物本体の重量を支持する免震装置を備える免震構造物において、前記免震装置を、前記構造物本体に作用する地震力による転倒モーメントを小さく抑制する高さ位置に設けたことを特徴とする。   In order to solve the above-described problems and achieve the object, a seismic isolation structure according to claim 1 of the present invention is a seismic isolation structure including a seismic isolation device that supports the weight of the structure body. The apparatus is provided at a height position that suppresses a falling moment due to a seismic force acting on the structure body.

また、本発明の請求項２に係る免震構造物は、上述した請求項１において、前記構造物本体の支持基盤から略中間高さまで前記構造物本体に直接接しないように前記構造物本体に隣接して設けられた基部をさらに備え、前記免震装置を、前記構造物本体と前記基部との間に設けたことを特徴とする。   In addition, the seismic isolation structure according to claim 2 of the present invention is the structure main body according to claim 1 described above, wherein the structure main body is not directly in contact with the structure main body from the support base of the structure main body to a substantially intermediate height. A base portion provided adjacently is further provided, and the seismic isolation device is provided between the structure main body and the base portion.

また、本発明の請求項３に係る免震構造物は、上述した請求項１または２において、前記免震装置を、前記構造物本体に接続した補強部材と前記基部との間に設けたことを特徴とする。   Moreover, the seismic isolation structure which concerns on Claim 3 of this invention provided the said seismic isolation apparatus in the above-mentioned Claim 1 or 2 between the reinforcement member connected to the said structure main body, and the said base. It is characterized by.

本発明によれば、構造物本体の重量を支持する免震装置を備える免震構造物において、前記免震装置を、前記構造物本体に作用する地震力による転倒モーメントを小さく抑制する高さ位置に設けたので、転倒モーメントの大小に応じて振動規模が決まる構造物本体のロッキング振動を抑制ないし防止することができる。このため、構造物本体に別途ロッキング防止装置を設ける必要はなくコストアップを招かない。したがって、ロッキング振動を抑制ないし防止する低コストの免震構造物を提供することができる。   According to the present invention, in the seismic isolation structure including the seismic isolation device that supports the weight of the structure main body, the height position that suppresses the overturning moment due to the seismic force acting on the structure main body is small. Therefore, it is possible to suppress or prevent the rocking vibration of the structure body whose vibration scale is determined according to the magnitude of the overturning moment. For this reason, it is not necessary to separately provide an anti-locking device on the structure main body, and the cost is not increased. Therefore, a low-cost seismic isolation structure that suppresses or prevents rocking vibration can be provided.

図１は、本発明に係る免震構造物の実施例を示す側面図である。FIG. 1 is a side view showing an embodiment of a seismic isolation structure according to the present invention. 図２は、本発明に係る免震構造物の他の実施例を示す側面図である。FIG. 2 is a side view showing another embodiment of the seismic isolation structure according to the present invention. 図３は、従来の免震構造物のロッキング振動を説明する側面図である。FIG. 3 is a side view for explaining rocking vibration of a conventional seismic isolation structure.

以下に、本発明に係る免震構造物の実施例を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。   Below, the example of the seismic isolation structure concerning the present invention is described in detail based on a drawing. Note that the present invention is not limited to the embodiments.

図１に示すように、本発明に係る免震構造物１０は、構造物本体１２を免震支持する免震装置１４と、この免震装置１４を支持する基部１６と、構造物本体１２に接続した補強部材１８とを備える。   As shown in FIG. 1, a seismic isolation structure 10 according to the present invention includes a seismic isolation device 14 that isolates and supports a structure main body 12, a base 16 that supports the seismic isolation device 14, and a structure main body 12. And a connected reinforcing member 18.

免震装置１４は、基部１６と補強部材１８との間に介装してあり、補強部材１８を介して構造物本体１２の重量を支持している。この免震装置１４は、構造物本体１２に作用する地震力による転倒モーメントを小さく抑制する高さ位置に設けてある。   The seismic isolation device 14 is interposed between the base portion 16 and the reinforcing member 18, and supports the weight of the structure main body 12 via the reinforcing member 18. The seismic isolation device 14 is provided at a height position that suppresses a falling moment due to a seismic force acting on the structure body 12.

基部１６は、構造物本体１２の支持基盤２０から構造物本体１２の略中間高さまで、構造物本体１２に直接接しないように構造物本体１２の外周側（図１の側面視で構造物本体の両側）に隣接して立設してある。この基部１６は、柱、ブレース、耐震壁などの構造体で構成することができる。   The base portion 16 extends from the support base 20 of the structure main body 12 to a substantially intermediate height of the structure main body 12 so as not to directly contact the structure main body 12 (the structure main body in the side view of FIG. 1). (Adjacent to both sides). This base part 16 can be comprised with structures, such as a pillar, a brace, and a seismic wall.

ここで、地震力による転倒モーメントは、図１に示すように、構造物本体１２の重心Ｇから転倒支点となる免震装置１４までの鉛直距離と、構造物本体１２に働く水平方向の地震力の積で決まる。このため、ここでいう転倒モーメントを小さく抑制する高さ位置とは、構造物本体１２の重心Ｇから転倒支点となる免震装置１４までの鉛直距離を短くした高さ位置のことであり、好適には、免震装置１４を構造物本体１２の略中間高さ位置や、構造物本体１２の重心Ｇの高さ位置に設けることが望ましい。   Here, as shown in FIG. 1, the overturning moment due to the seismic force includes the vertical distance from the center of gravity G of the structure body 12 to the seismic isolation device 14 serving as the overturning fulcrum, and the horizontal seismic force acting on the structure body 12. Determined by the product of For this reason, the height position that suppresses the overturning moment is a height position that shortens the vertical distance from the center of gravity G of the structure body 12 to the seismic isolation device 14 that is the overturning fulcrum. For this, it is desirable to provide the seismic isolation device 14 at a substantially intermediate height position of the structure main body 12 or a height position of the center of gravity G of the structure main body 12.

補強部材１８は、構造物本体１２の略中間高さで水平方向に延設されており、両端を下方の免震装置１４により支持されている。この補強部材１８は、ブレースによるトラス構造部材で構成してもよいし、超大型のメガトラスで構成してもよい。このようにすることで、補強部材１８の曲げ剛性を向上することができる。   The reinforcing member 18 extends in the horizontal direction at a substantially intermediate height of the structure body 12, and both ends are supported by the seismic isolation device 14 below. The reinforcing member 18 may be constituted by a truss structure member made of braces, or may be constituted by a super large mega truss. By doing in this way, the bending rigidity of the reinforcement member 18 can be improved.

上記構成の動作および作用を説明する。
図１に示すように、免震構造物１０に地震力が作用すると、支持基盤２０、基部１６、免震装置１４、補強部材１８を介して構造物本体１２に揺れが伝わり、地震力による転倒モーメントが働く。これにより、構造物本体１２は、免震装置１４を転倒支点としてロッキング振動を起こそうとする。 The operation and action of the above configuration will be described.
As shown in FIG. 1, when seismic force acts on the seismic isolation structure 10, the vibration is transmitted to the structure main body 12 via the support base 20, the base 16, the seismic isolation device 14, and the reinforcing member 18, and falls due to seismic force. Moment works. Thereby, the structure main body 12 tries to cause rocking vibration by using the seismic isolation device 14 as a fall fulcrum.

ここで、免震装置１４は、地震力による転倒モーメントを小さく抑制する高さ位置に設けてあるので、転倒モーメントの大小に応じて振動規模が決まるロッキング振動は抑制ないし防止される。このため、ロッキング振動を抑制ないし防止するために構造物本体１２に別途ロッキング防止装置を設ける必要はなくコストアップを招かない。したがって、本発明によれば、ロッキング振動を抑制ないし防止する低コストの免震構造物を提供することができる。   Here, since the seismic isolation device 14 is provided at a height that suppresses the overturning moment due to the seismic force, rocking vibrations whose vibration magnitude is determined according to the magnitude of the overturning moment are suppressed or prevented. For this reason, it is not necessary to provide a separate locking prevention device in the structure body 12 in order to suppress or prevent the locking vibration, and the cost is not increased. Therefore, according to the present invention, it is possible to provide a low-cost seismic isolation structure that suppresses or prevents rocking vibration.

このように、本発明に係る免震構造物１０は、従来のように免震装置を構造物本体１２の下部ではなく、構造物本体１２の高さの中間部に配置することで、地震時に免震装置１４の高さ位置に関して働く転倒モーメントを小さく抑制するものであり、その免震装置１４の高さ位置によってはロッキング振動を無視できるレベルにまで抑制することができ、別途ロッキング防止装置を設ける必要はなくなる。   Thus, the seismic isolation structure 10 according to the present invention is arranged in the middle of the height of the structure main body 12 instead of the lower part of the structure main body 12 as in the prior art, so that at the time of an earthquake. The overturning moment acting on the height position of the seismic isolation device 14 is suppressed to a small level. Depending on the height position of the seismic isolation device 14, the rocking vibration can be suppressed to a negligible level. There is no need to provide it.

また、図２に示すように、構造物本体１２の外周側と内側の凹部２２とに基部１６および免震装置１４を設け、補強部材１８を介して構造物本体１２を外周側と内側とで支持する構成としてもよい。このようにしても本発明と同一の作用効果を奏することができる。   In addition, as shown in FIG. 2, the base 16 and the seismic isolation device 14 are provided in the outer peripheral side and the inner concave portion 22 of the structure main body 12, and the structure main body 12 is separated between the outer peripheral side and the inner side via the reinforcing member 18. It is good also as a structure to support. Even if it does in this way, there can exist the same effect as this invention.

以上説明したように、本発明によれば、構造物本体の重量を支持する免震装置を備える免震構造物において、前記免震装置を、前記構造物本体に作用する地震力による転倒モーメントを小さく抑制する高さ位置に設けたので、転倒モーメントの大小に応じて振動規模が決まる構造物本体のロッキング振動を抑制ないし防止することができる。このため、構造物本体に別途ロッキング防止装置を設ける必要はなくコストアップを招かない。したがって、ロッキング振動を抑制ないし防止する低コストの免震構造物を提供することができる。   As described above, according to the present invention, in the seismic isolation structure including the seismic isolation device that supports the weight of the structure main body, the seismic isolation device is subjected to a falling moment due to the seismic force acting on the structure main body. Since it is provided at the height position to be suppressed to a small level, it is possible to suppress or prevent the rocking vibration of the structure body whose vibration scale is determined according to the magnitude of the overturning moment. For this reason, it is not necessary to separately provide an anti-locking device on the structure main body, and the cost is not increased. Therefore, a low-cost seismic isolation structure that suppresses or prevents rocking vibration can be provided.

以上のように、本発明に係る免震構造物は、ロッキング振動を抑制ないし防止するのに有用であり、特に、低コストにロッキング振動を抑制ないし防止するのに適している。   As described above, the seismic isolation structure according to the present invention is useful for suppressing or preventing rocking vibration, and is particularly suitable for suppressing or preventing rocking vibration at a low cost.

１０ 免震構造物
１２ 構造物本体
１４ 免震装置
１６ 基部
１８ 補強部材
２０ 支持基盤
２２ 凹部
DESCRIPTION OF SYMBOLS 10 Base isolation structure 12 Structure main body 14 Base isolation device 16 Base 18 Reinforcement member 20 Support base 22 Recessed part

Claims (3)

構造物本体の重量を支持する免震装置を備える免震構造物において、
前記免震装置を、前記構造物本体に作用する地震力による転倒モーメントを小さく抑制する高さ位置に設けたことを特徴とする免震構造物。 In a seismic isolation structure equipped with a seismic isolation device that supports the weight of the structure body,
A seismic isolation structure characterized in that the seismic isolation device is provided at a height that suppresses a falling moment due to a seismic force acting on the structure body. 前記構造物本体の支持基盤から略中間高さまで前記構造物本体に直接接しないように前記構造物本体に隣接して設けられた基部をさらに備え、前記免震装置を、前記構造物本体と前記基部との間に設けたことを特徴とする請求項１に記載の免震構造物。   A base portion provided adjacent to the structure main body so as not to directly contact the structure main body from a support base of the structure main body to a substantially intermediate height, the seismic isolation device, the structure main body and the structure main body The base-isolated structure according to claim 1, wherein the base-isolated structure is provided between the base portion and the base portion. 前記免震装置を、前記構造物本体に接続した補強部材と前記基部との間に設けたことを特徴とする請求項１または２に記載の免震構造物。   The seismic isolation structure according to claim 1 or 2, wherein the seismic isolation device is provided between a reinforcing member connected to the structure main body and the base.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9910502B2 (en) 2011-09-15 2018-03-06 Koninklijke Philips N.V. Gesture-based user-interface with user-feedback

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002121929A (en) * 2000-10-13 2002-04-26 Takenaka Komuten Co Ltd Three-dimensional floating body base isolation method provided with air cushion and floating body base isolation structure
JP2002147055A (en) * 2000-11-16 2002-05-22 Takenaka Komuten Co Ltd Floating body high-floor type base isolation structure using heavy muddy water
JP2005083018A (en) * 2003-09-05 2005-03-31 Shimizu Corp Floating type base isolation structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002121929A (en) * 2000-10-13 2002-04-26 Takenaka Komuten Co Ltd Three-dimensional floating body base isolation method provided with air cushion and floating body base isolation structure
JP2002147055A (en) * 2000-11-16 2002-05-22 Takenaka Komuten Co Ltd Floating body high-floor type base isolation structure using heavy muddy water
JP2005083018A (en) * 2003-09-05 2005-03-31 Shimizu Corp Floating type base isolation structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9910502B2 (en) 2011-09-15 2018-03-06 Koninklijke Philips N.V. Gesture-based user-interface with user-feedback

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