JPH11280295A - Base isolating structure - Google Patents
Base isolating structureInfo
- Publication number
- JPH11280295A JPH11280295A JP8683498A JP8683498A JPH11280295A JP H11280295 A JPH11280295 A JP H11280295A JP 8683498 A JP8683498 A JP 8683498A JP 8683498 A JP8683498 A JP 8683498A JP H11280295 A JPH11280295 A JP H11280295A
- Authority
- JP
- Japan
- Prior art keywords
- sliding
- sliding bearing
- coil spring
- bearing
- seismic isolation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Abstract
Description
【0001】[0001]
【発明が属する技術分野】本発明は免震構造に関し、特
に建物荷重、積載荷重等の鉛直荷重を滑り支承又は転が
り支承のみに負担させる免震構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure, and more particularly to a seismic isolation structure in which a vertical load such as a building load or a loading load is applied only to a sliding bearing or a rolling bearing.
【0002】[0002]
【従来の技術】滑り支承(又は転がり支承)を用いる免
震としては、建物荷重(軸力)を水平方向に並列に設け
た滑り支承と積層ゴムとによって分担し、積層ゴムを滑
り支承の地震時の水平方向復元力とする構造と、建物荷
重を滑り支承のみによって負担し、水平方向復元力を別
途設ける構造とがあり、前者の構造には、積層ゴムの鉛
直変形(長期クリープ)が大きく、免震階直上の梁の撓
みによって滑り支承と積層ゴムとの軸力分担の比率が変
化し、これによって滑り支承の水平摩擦力が変わるた
め、所期通りの免震性能が発揮されない場合があるとい
った欠陥がある。2. Description of the Related Art As seismic isolation using a sliding bearing (or rolling bearing), building load (axial force) is shared by a sliding bearing provided in parallel in a horizontal direction and a laminated rubber, and the laminated rubber is subjected to an earthquake caused by the sliding bearing. There are two types: a structure that uses horizontal restoring force at the time and a structure that bears the building load only by sliding bearings and separately provides a horizontal restoring force. The former structure has large vertical deformation (long-term creep) of laminated rubber. Because the ratio of the axial force distribution between the sliding bearing and the laminated rubber changes due to the deflection of the beam directly above the seismic isolation floor, the horizontal friction force of the sliding bearing changes, and the expected seismic isolation performance may not be exhibited. There is a defect that there is.
【0003】一方、後者の構造では、水平復元力を建物
荷重を負担しない積層ゴムとすると不経済であるため、
従来は、水平方向に配設したコイルバネが水平復元力と
して一般的に採用されている。On the other hand, in the latter structure, it is uneconomical if the horizontal restoring force is a laminated rubber that does not bear the building load.
Conventionally, a coil spring arranged in the horizontal direction is generally adopted as a horizontal restoring force.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、水平面
内に配したコイルバネでは、一のバネによる復元力が一
方向のみにしか効かず、その分、バネの設置数を増やす
必要があり、また、地震時の変形は一般に±30〜40
cm程度であるが、これを満足するバネは自然長が長く
高価となるといった問題がある。However, in the case of a coil spring arranged in a horizontal plane, the restoring force of one spring works only in one direction, and it is necessary to increase the number of springs accordingly. The deformation at the time is generally ± 30-40
cm, but there is a problem that a spring satisfying this condition has a long natural length and is expensive.
【0005】更に、滑り支承には小さな地震にも免震効
果を発揮させるべくゴムパッドが一般に鉛直方向に直列
に付加されるが、地震後にゴムパッドに残留変形が残り
易いという問題もある。[0005] Further, in the sliding bearing, rubber pads are generally added in series in a vertical direction so as to exert a seismic isolation effect even in a small earthquake, but there is a problem that residual deformation tends to remain on the rubber pads after the earthquake.
【0006】本発明は以上のような問題点に鑑みてなさ
れたものであり、その目的は、一のコイルバネによって
復元力を二方向に効かせることができ、滑り支承のゴム
パッドに残留変形が残らず、コスト的にも有利な免震構
造を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to enable a restoring force to be exerted in two directions by a single coil spring, and to cause residual deformation on a rubber pad of a sliding bearing. Another object is to provide a seismic isolation structure that is advantageous in terms of cost.
【0007】[0007]
【課題を解決するための手段】本発明に係る免震構造
は、鉛直荷重を滑り支承又は転がり支承のみで受ける免
震構造において、前記滑り支承又は転がり支承の地震時
の水平方向復元力を水平方向に対し角度付けして配設し
たコイルバネとしてなることを特徴とする。According to the seismic isolation structure of the present invention, in a seismic isolation structure in which a vertical load is received only by a sliding bearing or a rolling bearing, the horizontal restoring force of the sliding bearing or the rolling bearing during an earthquake is reduced. It is characterized by being a coil spring arranged at an angle to the direction.
【0008】コイルバネを水平方向に対し角度付けして
配設することにより、一のバネによる復元力を二方向に
効かせることができ、また、免震の水平変形に比べて、
バネの伸びを小さくすることができ、更に、大変形時に
は大きな水平力を発揮するが、小変形時にはバネの効き
は僅かであるため、地震後に滑り支承のゴムパッドには
残留変形が残らない。[0008] By arranging the coil spring at an angle to the horizontal direction, the restoring force of one spring can be made effective in two directions.
The extension of the spring can be reduced, and a large horizontal force is exerted at the time of large deformation, but the effect of the spring is small at the time of small deformation, so that no residual deformation remains on the rubber pad of the sliding bearing after the earthquake.
【0009】尚、水平方向に対するコイルバネの角度は
特に限定はしないが、例えば90度等とすることができ
る。The angle of the coil spring with respect to the horizontal direction is not particularly limited, but may be, for example, 90 degrees.
【0010】滑り支承としては、滑り材と滑り相手材と
からなる滑り免震装置にゴムシートと金属板とを交互に
重ね合わせてなるゴムパッドを直列に付加したものを好
ましく用いることができる。As the sliding bearing, it is possible to preferably use a sliding seismic isolation device comprising a sliding material and a sliding partner material and a rubber pad formed by alternately superimposing a rubber sheet and a metal plate in series.
【0011】転がり支承としては、ボールベアリング・
ユニット等にゴムパッドを重ねたものを好ましく用いる
ことができる。[0011] Rolling bearings include ball bearings
A unit in which a rubber pad is overlaid on a unit or the like can be preferably used.
【0012】[0012]
【実施例】以下、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【0013】図1は本発明に係る免震構造を略示する説
明図であり、地盤側フーチング1’と上部建物フーチン
グ2’との間に滑り支承10が介設されると共に、地盤
側1と上部建物2との間のフーチングから外れる箇所に
コイルバネ20が鉛直方向に配設され、滑り支承10は
上部建物2の全重量を負担し、コイルバネ20は滑り支
承10の地震時の水平方向復元力となる。FIG. 1 is an explanatory view schematically showing a seismic isolation structure according to the present invention. A sliding bearing 10 is interposed between a footing 1 'on the ground side and a footing 2' on the upper building. A coil spring 20 is vertically disposed at a position deviating from the footing between the upper building 2 and the sliding bearing 10 to bear the entire weight of the upper building 2, and the coil spring 20 restores the sliding bearing 10 in the horizontal direction in the event of an earthquake. Help.
【0014】滑り支承10は、滑り材(テフロン等)1
1と滑り相手材(ステンレス等)12とからなる滑り免
震装置にゴムシートと鋼板とを交互に重ね合わせてなる
ゴムパッド13を直列に付加したものであり、ゴムパッ
ド13が地盤側フーチング1’に、滑り材11がゴムパ
ッド13上に、滑り相手材12が上部建物フーチング
2’にそれぞれ固設される。The sliding bearing 10 is made of a sliding material (such as Teflon) 1
A rubber pad 13 formed by alternately superimposing a rubber sheet and a steel plate is added in series to a sliding seismic isolation device comprising a sliding member 1 and a sliding partner material (stainless steel or the like) 12. The sliding material 11 is fixed on the rubber pad 13 and the sliding partner material 12 is fixed on the upper building footing 2 '.
【0015】コイルバネ20の取付けはピン接合とすれ
ばよく、従って、フックやアイボルト等の簡便な方法を
用いることができる。また、コイルバネ20として、例
えば大型車(バス、重機)用のサスペンションバネを用
いることができる。The coil spring 20 may be attached by using a pin, so that a simple method such as a hook or an eyebolt can be used. Further, as the coil spring 20, for example, a suspension spring for a large vehicle (bus, heavy equipment) can be used.
【0016】図2は、以上の免震構造が地震時に図1の
状態から水平変形した状態を略示し、滑り支承10の滑
り材11−滑り相手材12間は滑り、また、コイルバネ
20は斜めに伸長して、滑り相手材12を初期位置に復
帰させる水平方向復元力を具備する。FIG. 2 schematically shows a state in which the above seismic isolation structure is horizontally deformed from the state shown in FIG. 1 at the time of the earthquake. The sliding member 10 of the sliding bearing 10 slides between the sliding member 12 and the coil spring 20 is inclined. And a horizontal restoring force for returning the mating member 12 to the initial position.
【0017】コイルバネ20を鉛直に配したことによ
り、免震層の水平変形に比べバネの伸びは小さくなり、
また、一のバネ20による復元力は二方向に効く。更
に、バネ20の鉛直向きの力は浮き上がり防止に有効と
なる。By arranging the coil spring 20 vertically, the elongation of the spring is smaller than the horizontal deformation of the seismic isolation layer,
The restoring force of one spring 20 works in two directions. Further, the vertical force of the spring 20 is effective in preventing the floating.
【0018】[0018]
【発明の効果】以上述べたように、本発明に係る免震構
造では、滑り支承の水平方向復元力として水平方向に対
し角度付けして配設したコイルバネを用いるため、一の
バネによって復元力を二方向に効かせることができ、そ
の分、バネの設置数を減らすことができ、また、免震の
水平変形に比べバネの伸びを小さくすることができるた
め、自然長が短く安価なバネを用いることができる。As described above, in the seismic isolation structure according to the present invention, since the coil spring disposed at an angle to the horizontal direction is used as the horizontal restoring force of the sliding bearing, the restoring force is controlled by one spring. Can be applied in two directions, the number of springs can be reduced accordingly, and the extension of the spring can be made smaller than the horizontal deformation of seismic isolation. Can be used.
【0019】更に、コイルバネは大変形時には大きな水
平力を発揮する一方、小変形時のバネの効きは僅かで済
むため、地震後、滑り支承に付加されるゴムパッドに残
留変形は残らない。Further, the coil spring exerts a large horizontal force at the time of large deformation, while the effect of the spring at the time of small deformation is small, so that there is no residual deformation in the rubber pad added to the sliding bearing after the earthquake.
【0020】更にまた、幾何学的非線形効果(材料の特
性によるものではなく、幾何学的な関係から非線形性が
生じるという効果)によって地震動に共振し憎くなり、
また、ハードニング効果(水平変形が大きくなるほど水
平方向復元力の増加(剛性)が大きくなるという効果)
により想定を超える地震時にもバネはストッパーとして
変位を抑制し(コイルバネは塑性化すればエネルギー吸
収をも担う。)、上下動による浮き上がりを防止すると
いった諸効果が得られる。Furthermore, it resonates with the ground motion due to the geometric nonlinear effect (the effect that nonlinearity is caused not by the property of the material but by the geometric relationship), and hates,
Also, the hardening effect (the effect of increasing the horizontal restoring force (rigidity) as the horizontal deformation increases)
Accordingly, even in the event of an earthquake exceeding expectations, the spring suppresses the displacement as a stopper (the coil spring also plays a role in absorbing energy if it is plasticized), and has various effects such as prevention of lifting due to vertical movement.
【図1】本発明に係る免震構造を略示する説明図であ
る。FIG. 1 is an explanatory view schematically showing a seismic isolation structure according to the present invention.
【図2】図1の状態から地震によって変形した状態を略
示する説明図である。FIG. 2 is an explanatory view schematically showing a state deformed by the earthquake from the state of FIG.
1 地盤側 1’ 地盤側フーチング 2 上部建物フーチング 2’ 上部建物 10 滑り支承 11 滑り材 12 滑り相手材 13 ゴムパッド 20 コイルバネ DESCRIPTION OF SYMBOLS 1 Ground side 1 'Ground side footing 2 Upper building footing 2' Upper building 10 Sliding bearing 11 Sliding material 12 Sliding partner material 13 Rubber pad 20 Coil spring
Claims (1)
で受ける免震構造において、前記滑り支承又は転がり支
承の地震時の水平方向復元力を水平方向に対し角度付け
して配設したコイルバネとしてなることを特徴とする免
震構造。In a seismic isolation structure in which a vertical load is received only by a sliding bearing or a rolling bearing, a coil spring is provided in which the horizontal restoring force of the sliding bearing or the rolling bearing during an earthquake is angled with respect to the horizontal direction. A seismic isolation structure characterized by the following.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8683498A JPH11280295A (en) | 1998-03-31 | 1998-03-31 | Base isolating structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8683498A JPH11280295A (en) | 1998-03-31 | 1998-03-31 | Base isolating structure |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11280295A true JPH11280295A (en) | 1999-10-12 |
Family
ID=13897852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8683498A Pending JPH11280295A (en) | 1998-03-31 | 1998-03-31 | Base isolating structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11280295A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9879415B2 (en) | 2013-11-08 | 2018-01-30 | Iso Systems Limited | Resilient bearing |
-
1998
- 1998-03-31 JP JP8683498A patent/JPH11280295A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9879415B2 (en) | 2013-11-08 | 2018-01-30 | Iso Systems Limited | Resilient bearing |
US10267032B2 (en) | 2013-11-08 | 2019-04-23 | Iso Systems Limited | Resilient bearing |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2866081C (en) | Modular isolation systems | |
JP2005538314A (en) | Isolation platform | |
JP3421732B2 (en) | Vertical seismic isolation device and three-dimensional seismic isolation device | |
JP4706958B2 (en) | Seismic isolation structure | |
JPH11280295A (en) | Base isolating structure | |
JPH08158697A (en) | Base isolation method and base isolation device applied to same method | |
JP2002070943A (en) | Slip support device for base isolation | |
JP4439694B2 (en) | High-damping frame of high-rise building | |
JP2003090145A (en) | Support method and support structure to cope with pull- out force in base isolation structure | |
JP2603426B2 (en) | Seismic isolation structure | |
JPH0512437Y2 (en) | ||
JP3336481B2 (en) | Installation method of seismic isolation device | |
JP3733500B2 (en) | Base-isolated building on soft ground | |
JPH0882012A (en) | Three-dimensional base isolation device | |
JP3033371B2 (en) | Performance confirmation method of seismic isolated floor system and seismic isolated floor horizontal force test device | |
JP2922928B2 (en) | Seismic isolation / isolation system | |
JPS61109879A (en) | Earthquake-proof apparatus | |
JP3268403B2 (en) | Horizontal spring device for base-isolated floor | |
JP2662772B2 (en) | Seismic isolation bearing structure for structures | |
JP3663563B2 (en) | Seismic isolation device | |
JP4045886B2 (en) | Deformation limiting device for seismic isolation bearing device and building support structure | |
JP2011184950A (en) | Slide foundation structure | |
JPS60261845A (en) | Earthquake dampening and support apparatus | |
JP2001032880A (en) | Support member for base isolation and vibration control device using roller | |
JPH1122783A (en) | Base isolation device |