JP2020094390A - Base isolation structure - Google Patents

Base isolation structure Download PDF

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JP2020094390A
JP2020094390A JP2018232538A JP2018232538A JP2020094390A JP 2020094390 A JP2020094390 A JP 2020094390A JP 2018232538 A JP2018232538 A JP 2018232538A JP 2018232538 A JP2018232538 A JP 2018232538A JP 2020094390 A JP2020094390 A JP 2020094390A
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seismic isolation
core
layer
isolation layer
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今井　克彦
Katsuhiko Imai
克彦 今井
敬 津曲
Kei Tsumagari
敬 津曲
佐藤　宏
Hiroshi Sato
宏 佐藤
真士 豊田
Masashi Toyoda
真士 豊田
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Corp
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Abstract

To reduce vibration response of an upper story part in a high-rise or super-high-rise structure.SOLUTION: A base isolation layer 6 is provided between an upper story part 4 which is an uppermost portion in a high-rise or ultra-high-rise structure 2 and a lower story part 3 on a lower side of the upper story part 4. The lower story part 3 has a core part 31 and a core adjacent part 32 adjacent to the core part 31. The core part 31 is set to have higher rigidity than the core adjacent part 32. The upper story part 4 is suspended and supported by a frame 7 having columns 71 erected on an upper part of the base isolation layer 6 and beams 72 supported by the columns 71.SELECTED DRAWING: Figure 1

Description

本発明は、免震構造に関する。 The present invention relates to a seismic isolation structure.

免震構造では、免震装置によって地盤から構造物に入力される地震エネルギーを低減させることで振動応答を低減させるように構成されている（例えば、特許文献１参照）。高層や超高層の構造物においても、免震構造を採用することで地震時の振動応答を効率的に低減させることができる。 The seismic isolation structure is configured to reduce the vibration response by reducing the seismic energy input from the ground to the structure by the seismic isolation device (see, for example, Patent Document 1). Even in high-rise and ultra-high-rise structures, the seismic isolation structure can effectively reduce the vibration response during an earthquake.

特開２０１３−０４０４７９号公報JP, 2013-040479, A

高層や超高層の構造物では、免震構造であっても高次モードの影響により高層部の振動応答が増幅し、応答加速度が大きくなることがある。 In a high-rise or ultra-high-rise structure, even in a base-isolated structure, the vibration response of the high-rise part may be amplified due to the influence of higher-order modes, and the response acceleration may increase.

そこで、本発明は、高層や超高層の構造物における高層部の振動応答を低減させることができる免震構造を提供することを目的とする。 Therefore, an object of the present invention is to provide a seismic isolation structure capable of reducing the vibration response of the high-rise portion in a high-rise or super-high-rise structure.

上記目的を達成するため、本発明に係る免震構造は、高層または超高層の構造物における最上部分となる高層部と、前記高層部の下側の下層部と、の間に免震層が設けられ、前記下層部は、コア部と、前記コア部に隣接するコア隣接部と、を有し、前記コア部は、前記コア隣接部よりも剛性が大きく設定されていることを特徴とする。 In order to achieve the above object, the seismic isolation structure according to the present invention has a seismic isolation layer between a high-rise portion that is the uppermost portion of a high-rise or ultra-high-rise structure and a lower-side lower portion of the high-rise portion. The lower layer portion includes a core portion and a core adjacent portion adjacent to the core portion, and the core portion is set to have a rigidity higher than that of the core adjacent portion. .

本発明では、下層部は、コア部を有することにより、高剛性の心棒を有する構造となり、地震時の振動応答を低減させることができる。そして、高層部と下層部との間に免震層が設けられていることにより、下層部から高層部に伝達される地震エネルギーを低減させることができ、高層部の振動応答を低減させることができる。
また、高層部が免震構造となることにより、下層部に対して高層部がＴＭＤ（チューンド・マス・ダンパー）効果を発揮するため、下層部の地震エネルギーを低減させることができる。 In the present invention, since the lower layer portion has the core portion, the lower layer portion has a structure having a highly rigid mandrel, and the vibration response at the time of an earthquake can be reduced. Since the seismic isolation layer is provided between the high-rise part and the low-rise part, the seismic energy transmitted from the low-rise part to the high-rise part can be reduced, and the vibration response of the high-rise part can be reduced. it can.
In addition, since the high-rise portion has a seismic isolation structure, the high-rise portion exerts a TMD (tuned mass damper) effect on the lower-rise portion, so that the seismic energy of the lower-rise portion can be reduced.

また、本発明に係る免震構造では、前記高層部は、前記免震層の上部に立設する柱と前記柱に支持された梁とを有する架構に吊り支持されていてもよい。
このような構成とすることにより、免震層の上部に高層部の柱を立設して高層部を構築する場合と比べて、免震層の上部に立設する柱の数を少なくすることができる。免震層に設けられる免震支承は、一般に免震層の上に立設される柱の下側に設けるため、免震層の上部に立設する柱の数を少なくできることによって、免震支承の台数を少なくすることができる。これにより、免震層の剛性を低くすることができ、高層部の長周期化を図ることができる。 Further, in the seismic isolation structure according to the present invention, the high-rise portion may be suspended and supported by a frame having a column standing on the upper part of the seismic isolation layer and a beam supported by the column.
By adopting such a configuration, the number of columns to be erected on the upper part of the seismic isolation layer should be reduced compared to the case of constructing a high-rise part by erection of the high-rise column on the upper part of the seismic isolation layer. You can The seismic isolation bearing provided on the seismic isolation layer is generally provided below the column that is erected on the seismic isolation layer, so the number of columns that are erected on the seismic isolation layer can be reduced. It is possible to reduce the number of. Thereby, the rigidity of the seismic isolation layer can be reduced, and the period of the high-rise portion can be lengthened.

本発明によれば、高層や超高層の構造物における高層部の振動応答を低減させることができる。 ADVANTAGE OF THE INVENTION According to this invention, the vibration response of the high-rise part in a high-rise or super-high-rise structure can be reduced.

本発明の実施形態による構造物の一例を示す立面図である。1 is an elevation view showing an example of a structure according to an embodiment of the present invention. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG.

以下、本発明の実施形態による免震構造について、図１および図２に基づいて説明する。
図１に示すように、本実施形態による免震構造１は、超高層の構造物２に採用されている。
本実施形態の構造物２は、地上４２階建てで、地上１階から５階までは商業施設として使用され、地上１階から３４階まではオフィスとして使用され、地上３５階から４２階まではホテルとして使用されるように想定されている。
以下では、地上１階から３４階までを下層部３とし、地上３５階から４２階までの最上部分を高層部４とする。
下層部３と高層部４との間には免震層６が設けられている。 Hereinafter, a seismic isolation structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the seismic isolation structure 1 according to the present embodiment is adopted for a super high-rise structure 2.
The structure 2 of this embodiment is 42 stories above the ground, is used as a commercial facility from the 1st floor to the 5th floor, is used as an office from the 1st floor to the 34th floor, and is from the 35th floor to the 42nd floor above the ground. It is intended to be used as a hotel.
Below, the 1st floor to the 34th floor above the ground will be referred to as the lower layer 3, and the uppermost portion from the 35th floor to the 42nd floor above will be referred to as the high-rise portion 4.
A seismic isolation layer 6 is provided between the lower layer portion 3 and the higher layer portion 4.

下層部３は、上下方向全体にわたってほぼ同じ外形に形成されている。図２に示すように、下層部３は、平面における中央部に位置するコア部３１と、コア部３１の周囲に隣接するコア隣接部３２と、を有している。本実施形態では、コア隣接部３２は、コア部３１を囲繞するように設けられている。コア部３１には、エレベータや階段などが設置され、コア隣接部３２には、店舗や執務室などが設置されている。
図１および図２に示すように、コア部３１には、所定の剛性を有するコアフレーム３３が設けられているとともに、粘性系ダンパーおよび履歴系ダンパーなどの制振装置３４（図１参照）が設けられている。コア部３１は、コア隣接部３２よりも剛性が大きく設定されている。
コア部３１は、上の層よりも下の層のほうが平面視形状が大きく設計され、剛性が大きく設定されている。各層のコア部３１は、上下方向に連続するように配置されている。 The lower layer portion 3 has substantially the same outer shape over the entire vertical direction. As shown in FIG. 2, the lower layer portion 3 has a core portion 31 located in the center of the plane and a core adjoining portion 32 adjacent to the periphery of the core portion 31. In the present embodiment, the core adjacent portion 32 is provided so as to surround the core portion 31. An elevator, stairs, etc. are installed in the core part 31, and a store, an office, etc. are installed in the core adjacent part 32.
As shown in FIGS. 1 and 2, the core portion 31 is provided with a core frame 33 having a predetermined rigidity, and a vibration damping device 34 (see FIG. 1) such as a viscous damper and a hysteresis damper is provided. It is provided. The core portion 31 is set to have higher rigidity than the core adjacent portion 32.
In the core portion 31, the lower layer is designed to have a larger plan view shape than the upper layer, and the rigidity is set to be large. The core portion 31 of each layer is arranged so as to be continuous in the vertical direction.

高層部４は、上下方向全体にわたってほぼ同じ外形に形成されている。高層部４は、平面視形状が下層部３よりも小さく形成されている。高層部４は、下層部３の平面視における中央部分の上部で、コア部３１の上部に配置されている（図２参照）。 The high-rise part 4 is formed in substantially the same outer shape in the entire vertical direction. The high-rise portion 4 is formed to have a shape in plan view smaller than that of the lower-rise portion 3. The high-layer part 4 is arranged above the core part 31 at the upper part of the central part of the lower layer part 3 in a plan view (see FIG. 2 ).

図１に示すように、本実施形態では、高層部４は、免震層６の上部に立設する柱７１と、柱７１に支持された梁７２とを有する架構７に吊り支持されている。このため、免震層６の上部に直接高層部４を構築する場合と比べて、免震層６の上部に立接される柱が少なくなっている。
免震層６には、積層ゴムなどの免震装置６１が設けられている。免震装置は、架構７の柱７１および免震層６の上部に立接される高層部４の柱それぞれの直下となる位置に設置されている。 As shown in FIG. 1, in the present embodiment, the high-rise part 4 is suspended and supported by a frame 7 having a column 71 standing upright on the seismic isolation layer 6 and a beam 72 supported by the column 71. .. Therefore, the number of columns that are erected on the upper part of the seismic isolation layer 6 is smaller than that when the high-rise part 4 is directly constructed on the upper part of the seismic isolation layer 6.
The seismic isolation layer 6 is provided with a seismic isolation device 61 such as laminated rubber. The seismic isolation device is installed at a position directly below each of the columns 71 of the frame 7 and the columns of the high-rise part 4 erected on the upper part of the seismic isolation layer 6.

次に、上述した本実施形態による免震構造１の作用・効果について図面を用いて説明する。
上述した本実施形態による免震構造１では、下層部３は、コア部３１を有することにより、高剛性の心棒を有する構造となり、地震時の振動応答を低減させることができる。そして、高層部４と下層部３との間に免震層６が設けられていることにより、下層部３から高層部４に伝達される地震エネルギーを低減させることができ、高層部４の振動応答を低減させることができる。
また、高層部４が免震構造となることにより、下層部３に対して高層部４がＴＭＤ（チューンド・マス・ダンパー）効果を発揮するため、下層部３の地震エネルギーを低減させることができる。 Next, the operation and effect of the seismic isolation structure 1 according to the present embodiment described above will be described with reference to the drawings.
In the seismic isolation structure 1 according to the present embodiment described above, the lower layer portion 3 has the core portion 31 so that the lower layer portion 3 has a highly rigid mandrel, and the vibration response during an earthquake can be reduced. Since the seismic isolation layer 6 is provided between the high-rise part 4 and the lower-rise part 3, the seismic energy transmitted from the lower-rise part 3 to the high-rise part 4 can be reduced, and the vibration of the high-rise part 4 can be reduced. The response can be reduced.
Further, since the high-rise part 4 has a seismic isolation structure, the high-rise part 4 exerts a TMD (tuned mass damper) effect on the lower-rise part 3, so that the seismic energy of the lower-rise part 3 can be reduced. ..

また、高層部４は、免震層６の上部に立設する柱と柱に支持された梁とを有する架構に吊り支持されていることにより、免震層６の上部に高層部４の柱を立設して高層部４を構築する場合と比べて、免震層６の上部に立設する柱の数を少なくすることができる。免震層６に設けられる免震支承は、一般に免震層６の上に立設される柱の下側に設けるため、免震層６の上部に立設する柱の数を少なくできることによって、免震支承の台数を少なくすることができる。これにより、免震層６の剛性を低くすることができ、高層部４の長周期化を図ることができる。 In addition, the high-rise part 4 is suspended and supported by a frame having columns that stand upright on the seismic isolation layer 6 and beams supported by the columns, so that the pillars of the high-rise part 4 are provided above the seismic isolation layer 6. It is possible to reduce the number of columns that are erected on the seismic isolation layer 6 as compared with the case where the high-rise part 4 is constructed by erected. Since the seismic isolation bearings provided in the seismic isolation layer 6 are generally provided below the columns that are erected on the seismic isolation layer 6, the number of columns that are erected on the seismic isolation layer 6 can be reduced, The number of seismic isolation bearings can be reduced. As a result, the rigidity of the seismic isolation layer 6 can be reduced, and the length of the high-rise portion 4 can be increased.

以上、本発明による免震構造の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記の実施形態では、高層部４は、免震層６の上部に立設する柱と柱に支持された梁とを有する架構に吊り支持されている。これに対し、高層部４は、架構に吊り支持されず、免震層６の上部に高層部４の柱が立設するように構築されていてもよい。 Although the embodiments of the seismic isolation structure according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist thereof.
For example, in the above-described embodiment, the high-rise part 4 is suspended and supported by a frame having columns that stand upright on the seismic isolation layer 6 and beams that are supported by the columns. On the other hand, the high-rise part 4 may not be suspended and supported by the frame, but the pillar of the high-rise part 4 may be erected above the seismic isolation layer 6.

また、上記の実施形態では、コア部３１に粘性系ダンパーおよび履歴系ダンパーなどの制振装置３４が設けられているが、コア部３１に制振装置３４が設けられていなくてもよい。また、コア部３１以外に制振装置が設けられていてもよい。また、コア部３１やコア部３１以外に設けられる制振装置の種類は適宜設定されてよい。 Further, in the above embodiment, the core portion 31 is provided with the vibration damping device 34 such as the viscous damper and the hysteresis damper, but the core portion 31 may not be provided with the vibration damping device 34. A vibration damping device may be provided in addition to the core portion 31. Further, the type of the vibration damping device provided in the core portion 31 or other than the core portion 31 may be appropriately set.

また、上記の実施形態では、高層部４は、平面形状が下層部３よりも小さく、平面視において下層部３の外周部の内側に配置されているが、高層部４が下層部３と同じ平面形状であってもよい。また、高層部４が下層部３よりも側方に張り出す構成であってもよい。 Further, in the above-described embodiment, the high-rise portion 4 has a planar shape smaller than that of the lower-layer portion 3 and is arranged inside the outer peripheral portion of the lower-layer portion 3 in a plan view, but the high-rise portion 4 is the same as the lower-layer portion 3. It may have a planar shape. Further, the high layer portion 4 may be configured to project laterally beyond the lower layer portion 3.

１ 免震構造
２ 構造物
３ 下層部
４ 高層部
６ 免震層
７ 架構
３１ コア部
３２ コア隣接部
７１ 柱
７２ 梁 1 seismic isolation structure 2 structure 3 lower layer 4 high-rise part 6 seismic isolation layer 7 frame 31 core part 32 core adjoining part 71 column 72 beam

Claims (2)

高層または超高層の構造物における最上部分となる高層部と、前記高層部の下側の下層部と、の間に免震層が設けられ、
前記下層部は、コア部と、前記コア部に隣接するコア隣接部と、を有し、
前記コア部は、前記コア隣接部よりも剛性が大きく設定されていることを特徴とする免震構造。 A seismic isolation layer is provided between a high-rise part, which is the uppermost part in a high-rise or ultra-high-rise structure, and a lower-layer part below the high-rise part,
The lower layer portion has a core portion and a core adjacent portion adjacent to the core portion,
The seismic isolation structure is characterized in that the core portion is set to have a rigidity higher than that of the core adjacent portion. 前記高層部は、前記免震層の上部に立設する柱と前記柱に支持された梁とを有する架構に吊り支持されていることを特徴とする請求項１に記載の免震構造。 The seismic isolation structure according to claim 1, wherein the high-rise portion is suspended and supported by a frame having a column standing upright on the seismic isolation layer and a beam supported by the column.
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JP2011137303A (en) * 2009-12-28 2011-07-14 Shimizu Corp Base isolation structure
JP2013040479A (en) * 2011-08-15 2013-02-28 Shimizu Corp Seismic isolation and control structure
JP2017071909A (en) * 2015-10-05 2017-04-13 清水建設株式会社 Multistoried base-isolated structure

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JP2003328586A (en) * 2002-05-15 2003-11-19 Shimizu Corp Base isolation structure for building
JP2005090101A (en) * 2003-09-18 2005-04-07 Takenaka Komuten Co Ltd Seismic response control structure
JP2006045933A (en) * 2004-08-05 2006-02-16 Takenaka Komuten Co Ltd Continuous layer core wall type seismic control high-rise multiple dwelling house building
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022127169A (en) * 2021-02-19 2022-08-31 清水建設株式会社 Base-isolation structure
JP7440441B2 (en) 2021-02-19 2024-02-28 清水建設株式会社 Seismic isolation structure

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