JPH10184089A - Vibration isolation structure of structure - Google Patents
Vibration isolation structure of structureInfo
- Publication number
- JPH10184089A JPH10184089A JP34952596A JP34952596A JPH10184089A JP H10184089 A JPH10184089 A JP H10184089A JP 34952596 A JP34952596 A JP 34952596A JP 34952596 A JP34952596 A JP 34952596A JP H10184089 A JPH10184089 A JP H10184089A
- Authority
- JP
- Japan
- Prior art keywords
- slope
- building
- support plate
- foundation
- ball
- 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)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、構造物の免震構造
に関する。TECHNICAL FIELD The present invention relates to a seismic isolation structure for a structure.
【0002】[0002]
【従来の技術】従来より、転がり支承手段を用いた建築
物の免震構造が知られている。転がり支承手段は、基礎
または建築物に固定されかつ略摺鉢状の斜面を有する支
持板と、基礎と建築物とが水平方向に相対的に変位した
ときに前記支持板の斜面を転動するボールとから主に構
成されており、前記斜面でボールを転動させて復元力を
得るようにしている。斜面の角度θは、例えば、転がり
摩擦係数μが0.07である場合、約4(°)に設定され
る。2. Description of the Related Art Conventionally, seismic isolation structures for buildings using rolling bearing means have been known. The rolling bearing means is fixed to the foundation or the building and has a support plate having a substantially mortar-shaped slope, and rolls the slope of the support plate when the base and the building are relatively displaced in the horizontal direction. The ball is mainly composed of a ball and the ball is rolled on the slope to obtain a restoring force. The angle θ of the slope is set to about 4 (°) when the rolling friction coefficient μ is 0.07, for example.
【0003】[0003]
【発明が解決しようとする課題】ところで、前記ボール
が斜面を上昇する工程では、転がり支承手段の分担荷重
(建築物の重量を転がり支承手段の個数で割った荷重)
をW、転がり摩擦係数をμ、斜面の角度をθとすると、
図3に示すように、ボールaには、摩擦力に打ち勝つ力
と抗力に打ち勝つ力との和である(μ・W・cos2θ+W
・sinθ・cosθ)が水平方向に作用しており、この力は
建築物に水平力として働く。この水平力は、θ=4
(°)、μ=0.07、W=5(ton)とすると、μ・W・c
os2θ+W・sinθ・cosθ=0.7(ton)となる。したが
って、斜面bが一定の角度であるため、建築物は、ボー
ルaが上昇し始める瞬間に0.7(ton)の衝撃を受ける
という不具合がある。また、0.7(ton)の水平力は、
非免震の建築物が受ける加速度137(Gal)の地震動に
相当する(980(Gal)/5(ton)×0.7(ton)=13
7(Gal))。よって、従来の転がり支承では137(Gal)
以下の地震には対応しきれないという問題点がある。In the process of raising the ball on the slope, the load shared by the rolling bearing means (the load obtained by dividing the weight of the building by the number of the rolling bearing means).
Is W, the rolling friction coefficient is μ, and the angle of the slope is θ,
As shown in FIG. 3, the ball a has the sum of the force overcoming the frictional force and the force overcoming the drag (μ · W · cos 2 θ + W).
・ Sinθ ・ cosθ) acts in the horizontal direction, and this force acts as a horizontal force on the building. This horizontal force is θ = 4
(°), μ = 0.07, W = 5 (ton), μ · W · c
os 2 θ + W · sin θ · cos θ = 0.7 (ton) Therefore, since the slope b has a constant angle, the building has a disadvantage that the ball a receives an impact of 0.7 (ton) at the moment when the ball a starts to rise. Also, the horizontal force of 0.7 (ton) is
This corresponds to a ground motion with an acceleration of 137 (Gal) received by a non-seismic building (980 (Gal) / 5 (ton) x 0.7 (ton) = 13
7 (Gal)). Therefore, in the conventional rolling bearing, 137 (Gal)
There is a problem that it cannot respond to the following earthquakes.
【0004】本発明は、前記従来の問題点に鑑みてなさ
れたものであって、構造物に働く衝撃を緩和し、かつ、
小さい地震に対しても良好に免震性能を発揮する構造物
の免震構造を提供することを目的とする。[0004] The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above-mentioned problems, and has an object to mitigate an impact acting on a structure,
An object of the present invention is to provide a seismic isolation structure for a structure that exhibits good seismic isolation performance even for a small earthquake.
【0005】[0005]
【課題を解決するための手段】本発明は、前記目的を達
成するため次のような構成を有する。すなわち、請求項
1の発明は、基礎と構造物との間に介在して該構造物を
水平方向に移動自在に支持する転がり支承手段を備えた
構造物の免震構造において、前記転がり支承手段は、基
礎または構造物に固定されかつ略摺鉢状の斜面を有する
支持部材と、基礎と構造物とが水平方向に相対的に変位
したときに前記支持部材の斜面を転動するボールとから
主になり、前記支持部材の中心から半径方向外側に行く
に従って角度が大きくなるように前記斜面を段階的に傾
斜させたことを特徴とする構造物の免震構造である。The present invention has the following configuration to achieve the above object. In other words, the invention according to claim 1 is a seismic isolation structure for a structure having rolling support means interposed between a foundation and a structure for movably supporting the structure in a horizontal direction. The support member is fixed to the foundation or structure and has a substantially mortar-shaped slope, and a ball that rolls on the slope of the support member when the foundation and the structure are relatively displaced in the horizontal direction. Mainly, a seismic isolation structure for a structure, characterized in that the slope is inclined stepwise so that the angle becomes larger toward the outside in the radial direction from the center of the support member.
【0006】本発明によれば、前記支持部材の中心から
半径方向外側に行くに従って角度が大きくなるように前
記斜面を段階的に形成したので、ボールの上昇工程にお
いて、建築物が受ける水平力が段階的に大きくなり、建
築物に加わる衝撃を緩和することができる。According to the present invention, the slope is formed in a stepwise manner so that the angle increases radially outward from the center of the support member, so that the horizontal force applied to the building during the ball lifting process is reduced. The size gradually increases, and the impact applied to the building can be reduced.
【0007】[0007]
【発明の実施の形態】以下、図面を参照して本発明の一
実施形態を説明する。本実施形態に係る免震構造は、本
発明を一般住宅用の建築物に適用した例である。図1に
示すように、基礎2と建築物4との間であって例えば建
築物4の四隅のそれぞれの角には、建築物4を水平方向
に移動自在に支持する転がり支承手段6が介在されてい
る。転がり支承手段6は、基礎2側に設けられた下側支
持板(支持部材に相当)8と、下側支持板8に対向して
建築物4の土台に固定された上側支持板10と、上側支
持板10と下側支持板8との間に配設されると共に基礎
2と建築物4とが水平方向に相対的に変位したときに上
側支持板10および下側支持板8それぞれに対して転動
するボール12とを有する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The seismic isolation structure according to the present embodiment is an example in which the present invention is applied to a building for a general house. As shown in FIG. 1, between the foundation 2 and the building 4, for example, at each of the four corners of the building 4, rolling bearing means 6 that supports the building 4 movably in the horizontal direction is interposed. Have been. The rolling bearing means 6 includes a lower support plate (corresponding to a support member) 8 provided on the foundation 2 side, an upper support plate 10 fixed to the base of the building 4 so as to face the lower support plate 8, The upper support plate 10 and the lower support plate 8 are disposed between the upper support plate 10 and the lower support plate 8, respectively, when the foundation 2 and the building 4 are relatively displaced in the horizontal direction. Ball 12 that rolls.
【0008】上側支持板10は、水平面に沿った下面1
0aを有する平面視で略円形のものである。下側支持板
8は、平面視で略円形を呈して基礎2に固定される。下
側支持板8には、その中心から外方に行くに従って建築
物4の土台に近づく略摺鉢状の斜面8aを有する。[0008] The upper support plate 10 has a lower surface 1 along a horizontal plane.
It is substantially circular in plan view having 0a. The lower support plate 8 has a substantially circular shape in plan view and is fixed to the foundation 2. The lower support plate 8 has a substantially mortar-shaped slope 8a approaching the base of the building 4 from the center to the outside.
【0009】この斜面8aは、下側支持板8の中心から
半径方向外側に行くに従って段階的に角度が大きくなる
ように形成される。すなわち、斜面8aは、直径D1を
外径とした内側の斜面8a1と、前記直径D1を内径と
し直径D2を外径とした円錐台状の外側の斜面8a2と
からなり、これら二段の斜面8a1,8a2は、共に縦
断面直線状に形成される。The slope 8a is formed such that the angle gradually increases from the center of the lower support plate 8 toward the outside in the radial direction. That is, the slope 8a includes an inner slope 8a1 having an outer diameter of D1 and an outer slope 8a2 having a truncated cone shape having an inner diameter of D1 and an outer diameter of D2. , 8a2 are both formed in a straight line in longitudinal section.
【0010】図2は、本実施形態の免震構造に係る復元
力特性を示す図であり、前記内側の斜面8a1の角度を
1(°)とし、外側の斜面8a2の角度を4(°)に設定し
た場合の復元力特性を示している。また、図2におい
て、建築物4に加わる水平力を示す縦軸の右側(第1、
第4象限)は、ボール12が斜面8aを右方向に昇って
左方向に下降する特性を示し、左側(第2、第3象限)
は、ボール12が斜面8aを左方向に昇って右方向に下
降する特性を示す。なお、この場合の転がり支承手段6
の分担荷重は5(ton)、転がり摩擦係数は0.07であ
る。FIG. 2 is a graph showing the restoring force characteristics of the seismic isolation structure of the present embodiment. The angle of the inner slope 8a1 is 1 (°), and the angle of the outer slope 8a2 is 4 (°). 4 shows the restoring force characteristics when set to. In FIG. 2, the right side of the vertical axis indicating the horizontal force applied to the building 4 (first,
The fourth quadrant shows the characteristic that the ball 12 rises rightward on the slope 8a and descends leftward, and the left side (second and third quadrants).
Shows a characteristic in which the ball 12 rises leftward on the slope 8a and descends rightward. In this case, the rolling bearing means 6
Has a shared load of 5 (ton) and a rolling friction coefficient of 0.07.
【0011】図2の第1象限に示すように、下側支持板
8の中心にあるボール12は、地震が起きると、先ず緩
やかな1(°)の斜面8a1を昇り始め、この斜面8a1
を昇りきると次に4(°)の斜面8a2を上昇する。この
工程において建築物4が受ける水平力は、ボール12が
緩やか1(°)の斜面8a1を昇るときは0.44(ton)
であり、4(°)の斜面8a2では通常の0.7(ton)と
なる。この水平力の大きさについては、第3象限で示す
左側にボール12が昇る場合も同様である(但し、その
場合は水平力に負の符号が付く)。また、1(°)の斜面
8a1から4(°)の斜面8a2へ移るときの衝撃力は、
0.7(ton)から0.44(ton)を差引いた0.26(to
n)となる。As shown in the first quadrant of FIG. 2, when an earthquake occurs, the ball 12 at the center of the lower support plate 8 first starts climbing a gentle 1 (°) slope 8a1.
Then, the slope 8a2 of 4 (°) is ascended. In this process, the horizontal force applied to the building 4 is 0.44 (ton) when the ball 12 rises slowly on the slope 8a1 of 1 (°).
In the case of the slope 8a2 of 4 (°), the normal value is 0.7 (ton). The magnitude of this horizontal force is the same when the ball 12 rises to the left as shown in the third quadrant (however, in this case, the horizontal force is given a negative sign). The impact force when moving from the slope 8a1 of 1 (°) to the slope 8a2 of 4 (°) is as follows.
0.26 (to) obtained by subtracting 0.44 (ton) from 0.7 (ton)
n).
【0012】以上のような本実施形態の免震構造によれ
ば、ボール12の上昇工程において、建築物4が受ける
衝撃力は、転がり始めでは0.44(ton)であり、ボー
ル12が斜面8a1から斜面8a2へ移行するときは
0.26(ton)となるため、一度に0.7(ton)の大きな
衝撃が建築物4に加わることはなく、衝撃を緩和するこ
とができる。また、この場合の等価減衰定数は32(%)
であり、一般に免震構造に要求される条件(等価減衰定
数が20〜40(%)の範囲)も満足している。According to the seismic isolation structure of the present embodiment as described above, the impact force applied to the building 4 in the step of lifting the ball 12 is 0.44 (ton) at the beginning of rolling, and the ball 12 When transitioning from 8a1 to the slope 8a2, it is 0.26 (ton). Therefore, a large impact of 0.7 (ton) is not applied to the building 4 at a time, and the impact can be reduced. The equivalent damping constant in this case is 32 (%)
This also satisfies the conditions generally required for the seismic isolation structure (the equivalent damping constant is in the range of 20 to 40 (%)).
【0013】また、0.44(ton)の水平力が働くとき
の地震の加速度は、980(Gal)/5(ton)×0.44(t
on)=86(Gal)であり、本実施形態では、86(Gal)程
度の小規模の地震から免震が働くようになる。小さい地
震の場合、ボール12の変位も小さくなることから、緩
やかな斜面8a1のみで対応可能である。The acceleration of an earthquake when a horizontal force of 0.44 (ton) acts is 980 (Gal) / 5 (ton) × 0.44 (t)
on) = 86 (Gal), and in the present embodiment, seismic isolation starts from a small-scale earthquake of about 86 (Gal). In the case of a small earthquake, the displacement of the ball 12 is also small, so it is possible to deal with only the gentle slope 8a1.
【0014】なお、本実施形態は本発明の好適な実施の
態様であり、本発明の技術的範囲はこの実施形態に限定
されない。例えば、本実施形態では、上側支持板10お
よび下側支持板8の両方でボール12を転動させる転が
り支承手段6に本発明を適用したが、本発明はこれに限
定されず、基礎および構造物のうちの一方にボールを回
転自在に保持させると共に他方のみに支持部材を設け、
該他方側の支持部材のみでボールを転動させる転がり支
承手段(例えば、いわゆるフリーベアリングタイプの支
承手段)に対しても、適用可能である。また、本発明に
係る斜面は、上側支持板10に設けてもよいし、上側支
持板10および下側支持板8の両方に設けてもよい。The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment. For example, in the present embodiment, the present invention is applied to the rolling bearing means 6 for rolling the ball 12 on both the upper support plate 10 and the lower support plate 8, but the present invention is not limited to this, and the present invention is not limited to this. A ball is rotatably held on one of the objects and a support member is provided only on the other,
The present invention is also applicable to a rolling bearing means (for example, a so-called free-bearing type bearing means) for rolling a ball only by the other supporting member. Further, the slope according to the present invention may be provided on the upper support plate 10 or on both the upper support plate 10 and the lower support plate 8.
【0015】[0015]
【発明の効果】以上の説明の通り、本発明によれば、構
造物の免震構造において、構造物に加わる衝撃を緩和
し、かつ、小さい地震に対しても良好に免震性能を発揮
することができる。As described above, according to the present invention, in a seismic isolation structure for a structure, the impact applied to the structure is reduced, and the seismic isolation performance is excellent even for a small earthquake. be able to.
【図1】本実施形態に係る転がり支承手段の側面図であ
る。FIG. 1 is a side view of a rolling bearing according to the present embodiment.
【図2】本実施形態に係る復元力特性を示す図である。FIG. 2 is a diagram showing restoring force characteristics according to the embodiment.
【図3】従来の免震構造においてボールに作用する力を
示す転がり支承手段の側面図である。FIG. 3 is a side view of a rolling bearing means showing a force acting on a ball in a conventional seismic isolation structure.
2 基礎 4 建築物(構造物の一例) 6 転がり支承手段 8 下側支持板(支持部材に相当) 8a 斜面 8a1 内側の斜面 8a2 外側の斜面 12 ボール 2 Foundation 4 Building (example of structure) 6 Rolling bearing means 8 Lower support plate (corresponding to support member) 8a Slope 8a1 Inner slope 8a2 Outer slope 12 Ball
Claims (1)
を水平方向に移動自在に支持する転がり支承手段を備え
た構造物の免震構造において、 前記転がり支承手段は、基礎または構造物に固定されか
つ略摺鉢状の斜面を有する支持部材と、基礎と構造物と
が水平方向に相対的に変位したときに前記支持部材の斜
面を転動するボールとから主になり、前記支持部材の中
心から半径方向外側に行くに従って角度が大きくなるよ
うに前記斜面を段階的に傾斜させたことを特徴とする構
造物の免震構造。1. A seismic isolation structure for a structure having rolling bearing means interposed between a foundation and a structure for movably supporting the structure in a horizontal direction, wherein the rolling bearing means comprises a foundation or A support member fixed to the structure and having a substantially mortar-shaped slope, mainly comprising a ball rolling on the slope of the support member when the foundation and the structure are relatively displaced in the horizontal direction, A seismic isolation structure for a structure, wherein the slope is inclined stepwise so that the angle becomes larger toward the outside in the radial direction from the center of the support member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34952596A JPH10184089A (en) | 1996-12-27 | 1996-12-27 | Vibration isolation structure of structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP34952596A JPH10184089A (en) | 1996-12-27 | 1996-12-27 | Vibration isolation structure of structure |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10184089A true JPH10184089A (en) | 1998-07-14 |
Family
ID=18404325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP34952596A Pending JPH10184089A (en) | 1996-12-27 | 1996-12-27 | Vibration isolation structure of structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10184089A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003097086A (en) * | 2001-09-19 | 2003-04-03 | Sekisui Chem Co Ltd | Base isolation building and construction method therefor |
JP2007239179A (en) * | 2006-03-05 | 2007-09-20 | Okabe Co Ltd | Base isolated structure, and base isolation device for use in the base isolated structure |
ITNA20110028A1 (en) * | 2011-06-30 | 2012-12-31 | Vincenzo Nunziata | ANTI-SEISMIC BALL INSULATOR ON INCLINED PLANS |
US8646976B2 (en) | 2011-02-24 | 2014-02-11 | Dreco Energy Services Ltd. | Auto-centering structural bearing |
JP2021143714A (en) * | 2020-03-12 | 2021-09-24 | 株式会社ダイフク | Floating unit |
-
1996
- 1996-12-27 JP JP34952596A patent/JPH10184089A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003097086A (en) * | 2001-09-19 | 2003-04-03 | Sekisui Chem Co Ltd | Base isolation building and construction method therefor |
JP2007239179A (en) * | 2006-03-05 | 2007-09-20 | Okabe Co Ltd | Base isolated structure, and base isolation device for use in the base isolated structure |
US8646976B2 (en) | 2011-02-24 | 2014-02-11 | Dreco Energy Services Ltd. | Auto-centering structural bearing |
ITNA20110028A1 (en) * | 2011-06-30 | 2012-12-31 | Vincenzo Nunziata | ANTI-SEISMIC BALL INSULATOR ON INCLINED PLANS |
JP2021143714A (en) * | 2020-03-12 | 2021-09-24 | 株式会社ダイフク | Floating unit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6420586B2 (en) | Roof isolation structure | |
JPH10184089A (en) | Vibration isolation structure of structure | |
JP6228337B1 (en) | Wind resistance device | |
JP2000304089A (en) | Falling preventive device for building and slip-out preventive device for laminate rubber isolator | |
JP2878626B2 (en) | Seismic isolation device | |
JP2005030071A (en) | Rolling vibration absorption bearing with attenuation function | |
JP2000074138A (en) | Slide type base isolation device for lightweight structure | |
JPH10184088A (en) | Vibration-isolation wind-resistant structure of structure | |
JP2575283B2 (en) | Seismic isolation device | |
JP3648651B2 (en) | Construction method of base-isolated building by the reverse driving method | |
JPS60211142A (en) | Quake damping device | |
JPH10115345A (en) | Base-isolated structure of construction | |
JP2000266116A (en) | Swinging bearing type base isolation device | |
JPH09196116A (en) | Base isolator of structure | |
JP3817084B2 (en) | Seismic isolation device | |
JP3260473B2 (en) | Mega structure brace frame damping structure incorporating damper unit | |
JP2001108013A (en) | Sliding base isolation device | |
JP2005249210A (en) | Damping apparatus | |
JP2927357B2 (en) | Seismic isolation support device | |
JP3028081B2 (en) | Dynamic rigid structure | |
JPH0849445A (en) | Method for installing base isolation system | |
JP3240432B2 (en) | Damping structure | |
JPH10220066A (en) | Base isolation structure for building | |
JPH10292670A (en) | Base isolating structure | |
JPH10280731A (en) | Vibration isolation device |