JP2746834B2 - Bridge body damping device - Google Patents

Bridge body damping device

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Publication number
JP2746834B2
JP2746834B2 JP14055094A JP14055094A JP2746834B2 JP 2746834 B2 JP2746834 B2 JP 2746834B2 JP 14055094 A JP14055094 A JP 14055094A JP 14055094 A JP14055094 A JP 14055094A JP 2746834 B2 JP2746834 B2 JP 2746834B2
Authority
JP
Japan
Prior art keywords
bridge
vibration damping
damping
vibration
displacement
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.)
Expired - Fee Related
Application number
JP14055094A
Other languages
Japanese (ja)
Other versions
JPH0813416A (en
Inventor
一彦 川島
茂樹 運上
秀毅 向
明英 久保
Original Assignee
建設省土木研究所長
財団法人土木研究センター
株式会社ピー・エス
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 建設省土木研究所長, 財団法人土木研究センター, 株式会社ピー・エス filed Critical 建設省土木研究所長
Priority to JP14055094A priority Critical patent/JP2746834B2/en
Publication of JPH0813416A publication Critical patent/JPH0813416A/en
Application granted granted Critical
Publication of JP2746834B2 publication Critical patent/JP2746834B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は、地震時等に生じる橋体
の振動を抑制するための橋体の制振装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge body vibration damping device for suppressing the vibration of a bridge body generated during an earthquake or the like.
【0002】[0002]
【従来の技術】近年長大な橋が建設されるようになって
きたが、長大な橋では低次の橋軸方向振動モードに起因
する橋軸方向応答変位が大きくなるため、これを低減す
る工夫が望まれている。長大な橋では低次の振動モード
は周期が長く、低加速度、大変位でコントロールが難し
い。
2. Description of the Related Art In recent years, long bridges have been constructed. However, in long bridges, the response in the bridge axis direction caused by a low-order vibration mode in the bridge axis direction becomes large. Is desired. In a long bridge, the low-order vibration mode has a long cycle and is difficult to control due to low acceleration and large displacement.
【0003】従来、地震時における橋の制振には橋の両
端に、又は主塔部に、例えば図4〜図6に示すようなダ
ンパを設けている。図4はオリフィス32を設けたシリ
ンダ31内に鉛33、ピストン35を収納し、シール材
34でシールした免震装置30である。ピストン35が
矢印36で示す方向に移動すると、鉛がエネルギー吸収
材として作用する。図5の免震装置40は、上板41と
下板42との間に積層ゴム43を介装し、中心に鉛プラ
グ44を立設したものである。矢印45、46のいずれ
の方向に対しても免震作用がある。図6は軟鋼の曲がり
梁である棒53のたわみにより免震する装置で、アーム
52の一端に棒53を固定し、アーム52の他端のピン
51を制振すべき物体及び固定物にそれぞれ取付けてお
く。地震により矢印55で示す相対運動が生じたとき、
棒53がたわみ範囲54で示すように曲げたわみを生
じ、免震する。これらの装置は、いずれも大きな変位に
対して、変位量が少なく、多数の装置の取付けを要し、
高価となる。
Conventionally, for damping a bridge during an earthquake, dampers as shown in FIGS. 4 to 6 are provided at both ends of the bridge or at the main tower. FIG. 4 shows a seismic isolation device 30 in which a lead 33 and a piston 35 are accommodated in a cylinder 31 provided with an orifice 32 and sealed with a sealing material 34. When the piston 35 moves in the direction indicated by the arrow 36, lead acts as an energy absorbing material. In the seismic isolation device 40 of FIG. 5, a laminated rubber 43 is interposed between an upper plate 41 and a lower plate 42, and a lead plug 44 is erected at the center. There is a seismic isolation effect in both directions of the arrows 45 and 46. FIG. 6 shows a seismic isolation device using the bending of a bar 53, which is a mild steel bending beam. Install it. When the relative motion indicated by the arrow 55 occurs due to the earthquake,
The bar 53 bends as shown by the flexure range 54 and seismically isolates. Each of these devices has a small amount of displacement for a large displacement, and requires the installation of a large number of devices.
It will be expensive.
【0004】大型の橋では、大型のダンパを必要とす
る。しかし、長大な橋では、固有周期が長く、応答変位
が非常に大きいのでダンパの効果が不十分となる問題が
あり、さらに集中的に大きな制動力を必要とするので、
設計が困難であり、また高価である。
[0004] Large bridges require large dampers. However, a long bridge has a problem that the natural cycle is long and the response displacement is very large, so that the effect of the damper is insufficient.Moreover, since a large braking force is required intensively,
It is difficult and expensive to design.
【0005】[0005]
【発明が解決しようとする課題】長大な橋においては、
従来、地震時の大きな変位によって落橋する危険性があ
り、このため、大きなダンパを設けなければならない。
これでも変位を吸収することができない時には、橋の設
計に大きな制約があった。本発明は長大な橋の地震時の
損傷を極小にするために、橋に摺動体を設けその摩擦抵
抗による減衰効果を利用して、地震被害を防止すること
ができる構造を提供することを目的とする。
SUMMARY OF THE INVENTION In a long bridge,
Conventionally, there is a risk of a bridge being dropped due to a large displacement during an earthquake, and therefore a large damper must be provided.
When displacement could not be absorbed, there were significant restrictions on the bridge design. An object of the present invention is to provide a structure in which a sliding body is provided on a bridge and the damping effect of its frictional resistance is used to prevent earthquake damage in order to minimize damage to a long bridge during an earthquake. And
【0006】[0006]
【課題を解決するための手段】本発明は、上記問題点を
解決するためになされたもので、制振しようとする橋体
に沿って橋体と相対移動可能に摺動面で接し、橋軸方向
に橋体外方に延長し、この延長した部分が橋台及び/又
は地盤に固定された制振要素からなることを特徴とする
橋体の制振装置である。
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a sliding surface which is relatively movable along a bridge to be damped and which is in contact with the bridge. A vibration damping device for a bridge body, which extends axially outward of a bridge body, and the extended portion comprises a vibration damping element fixed to an abutment and / or ground.
【0007】また、本発明の別の発明は、制振しようと
する橋体に固定し、橋軸方向に橋体外方に延長し、橋体
外部分が摺動面で地盤に接する制振要素からなることを
特徴とする橋体の制振装置を提供する。
Further, another invention of the present invention relates to a damping element which is fixed to a bridge to be damped, extends outward in the bridge axis direction, and the outer portion of the bridge comes into contact with the ground on a sliding surface. The present invention provides a bridge body vibration damping device.
【0008】[0008]
【作用】本発明の制振装置は橋軸両側に延長して連続一
体に構築する。そして、第1の発明では、この制振装置
は、橋体と縁を切っておき、相互にずれを生ずることが
できるようにし、相互摩擦により振動を減衰させる。こ
の構造においては地震による変位を制動する制動力が橋
面全体に分散する。また、この制振装置には、摩擦力に
よる引張り力が発生するので、これに対応する構造を考
慮した設計とする。
The vibration damping device according to the present invention extends continuously on both sides of the bridge shaft and is constructed continuously and integrally. In the first aspect of the present invention, the vibration damping device has a bridge body and an edge cut so that mutual displacement can be caused, and vibration is attenuated by mutual friction. In this structure, the braking force for braking the displacement due to the earthquake is distributed over the entire bridge surface. Further, since a tensile force due to frictional force is generated in this vibration damping device, a design corresponding to this structure is taken into consideration.
【0009】第2の発明では、制振装置は橋体と一体と
し、橋体外の部分において、地盤と摩擦を生じるように
しておく。長大な橋の地震発生時における応答変位は、
本発明の制振装置との摩擦により顕著に低減される。制
振装置の大きさは制限されないので、従来のように多数
の機械的な装置を使用する必要がなく、橋の設計の余裕
度が著しく拡大する。
[0009] In the second invention, the vibration damping device is integrated with the bridge body so as to generate friction with the ground outside the bridge body. The response displacement of a long bridge during an earthquake
It is significantly reduced by friction with the vibration damping device of the present invention. Since the size of the damping device is not limited, it is not necessary to use a large number of mechanical devices as in the related art, and the design margin of the bridge is greatly increased.
【0010】また、摩擦力を減衰に用いるのは理論上の
効果も大きい。なお、摺動部の摩擦を増大させるため
に、増摩材を用いたり、表面形状を工夫することは自由
である。
The use of frictional force for damping has a great theoretical effect. It is to be noted that in order to increase the friction of the sliding portion, it is possible to freely use an abrasive material or devise the surface shape.
【0011】[0011]
【実施例】図1は本発明の橋体の制振装置を示す説明図
である。橋体1は、橋脚2上に両端を支持され、主塔3
からケーブル4によって支持されている。本発明の制振
装置11は、図1に示すように、橋体1の上に橋体1と
は縁を切って摺動面12を設けて載置し、橋体から延長
した部分を地盤13に固定面14で固定するようにす
る。
FIG. 1 is an explanatory view showing a vibration damping device for a bridge according to the present invention. The bridge body 1 is supported at both ends on a pier 2 and has a main tower 3
From the cable 4. As shown in FIG. 1, a vibration damping device 11 of the present invention is mounted on a bridge body 1 with a sliding surface 12 cut off from the edge of the bridge body 1 and a portion extended from the bridge body is ground. 13 with a fixing surface 14.
【0012】1径間が75mの連続2径間からなるPC
斜張橋についてシミュレーションによって本発明の実施
例の振動解析を試算した。 斜張橋のケーブル張り形は準
ハープとし、主塔はフリー、2%の構造減衰を見込み、
摩擦抵抗を桁端部に作用させた。道路橋示方書I種地盤
動加速度の2倍を用いて試算した。
PC consisting of two continuous spans each having a span of 75 m
Implementation of the present invention by simulation for cable-stayed bridge
An example vibration analysis was calculated. Cable-stayed type of cable-stayed bridge is equivalent
Harp, the main tower is free,2%Expected structural damping of
Friction resistance was applied to the end of the spar. Road Bridge Specifications Class I Ground
forShakeA trial calculation was made using twice the dynamic acceleration.
【0013】制振装置11は、橋単位長さ当たりの重量
の約5%の重量とした。この制振装置11は主桁上にス
ライド可能に構築したものとした。制振装置11は橋軸
方向に0.2G以上の加速度が作用すると主桁上で滑動
を開始し、主桁に対し相対運動方向と逆向きの動摩擦抵
抗力を作用する。動摩擦抵抗をμ=0.2と仮定し、シ
ミュレーションにより振動解析を行った結果を、図3に
示す。図3は横軸に時間を取り、縦軸にそれぞれ振動の
加速度(ACC:gal)、振動速度(VEL:kin
e)、変位(DIS:cm)をとったチャートである。
摩擦がないときの速度曲線21、変位曲線23に対し
て、摩擦を考慮したときは速度曲線22、変位曲線24
のようになった。
The weight of the vibration damping device 11 is about 5% of the weight per unit length of the bridge. The vibration damping device 11 was constructed so as to be slidable on the main girder. When an acceleration of 0.2 G or more acts in the bridge axis direction, the vibration damping device 11 starts sliding on the main girder, and exerts a dynamic frictional resistance force on the main girder in a direction opposite to the relative movement direction. FIG. 3 shows the result of vibration analysis performed by simulation, assuming that the dynamic frictional resistance is μ = 0.2. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the acceleration of vibration (ACC: gal) and the vibration speed (VEL: kin).
e) is a chart showing displacement (DIS: cm).
In contrast to the speed curve 21 and the displacement curve 23 when there is no friction, the speed curve 22 and the displacement curve 24 when friction is considered.
It became like.
【0014】図3から明らかなように、延長150mの
斜張橋で最大応答変位が25cmから14cmに、ほぼ
半減した。図2は、制振装置11が、橋体1と固定面1
5で固定され、地盤13とは固定せずに摺動面16を設
けた例を示したものである。
As is clear from FIG. 3, the maximum response displacement of the cable-stayed bridge having a length of 150 m was reduced by half from 25 cm to 14 cm. FIG. 2 shows that the vibration damping device 11 includes the bridge 1 and the fixed surface 1.
5 shows an example in which the sliding surface 16 is provided without being fixed to the ground 13.
【0015】[0015]
【発明の効果】本発明の橋体の制振装置は、以上のよう
に構成されているので、橋体の地震時の変位を効果的に
減少させることができ、落橋等の事故を防止することが
できるという優れた効果を奏する。
Since the bridge body vibration damping device of the present invention is constructed as described above, the displacement of the bridge body during an earthquake can be effectively reduced, and an accident such as a falling bridge can be prevented. It has an excellent effect that it can be performed.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の実施例の橋体の制振装置を示す側面図
である。
FIG. 1 is a side view showing a bridge body vibration damping device according to an embodiment of the present invention.
【図2】本発明の実施例の橋体の制振装置を示す側面図
である。
FIG. 2 is a side view showing a vibration damping device for a bridge according to an embodiment of the present invention.
【図3】実施例の効果を示すチャートである。FIG. 3 is a chart showing effects of the embodiment.
【図4】従来の制振装置の説明図である。FIG. 4 is an explanatory diagram of a conventional vibration damping device.
【図5】従来の制振装置の説明図である。FIG. 5 is an explanatory diagram of a conventional vibration damping device.
【図6】従来の制振装置の説明図である。FIG. 6 is an explanatory diagram of a conventional vibration damping device.
【符号の説明】 1 橋体 2 橋脚 3 主塔 4 ケーブル 11 制振装置 12、16 摺動
面 13 地盤 14、15 固定
面 21、22 速度曲線 23、24 変位
曲線 30、40、50 免震装置
[Description of Signs] 1 Bridge 2 Bridge pier 3 Main tower 4 Cable 11 Damping device 12, 16 Sliding surface 13 Ground 14, 15 Fixed surface 21, 22 Velocity curve 23, 24 Displacement curve 30, 40, 50 Seismic isolation device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 運上 茂樹 茨城県つくば市大字旭1番地 建設省土 木研究所内 (72)発明者 向 秀毅 茨城県つくば市大字旭1番地 建設省土 木研究所内 (72)発明者 久保 明英 東京都千代田区丸の内3丁目4番1号 株式会社ピー・エス内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeki Ungami, 1st Asahi, Asahi, Tsukuba, Ibaraki Prefecture Within the Public Works Research Institute, Ministry of Construction (72) Inventor Akihide Kubo 3-4-1 Marunouchi, Chiyoda-ku, Tokyo PS Inn Co., Ltd.

Claims (2)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 制振しようとする橋体に沿って橋体と相
    対移動可能に摺動面で接し、橋軸方向に橋体外方に延長
    し、該延長した部分が橋台及び/又は地盤に固定された
    制振要素からなることを特徴とする橋体の制振装置。
    Claims: 1. A sliding surface movably relative to a bridge along a bridge body to be damped, and extends outward in the bridge axis direction, and the extended portion is connected to an abutment and / or ground. A bridge body vibration damping device comprising a fixed vibration damping element.
  2. 【請求項2】 制振しようとする橋体に固定し、橋軸方
    向に橋体外方に延長し、橋体外部分が摺動面で地盤に接
    する制振要素からなることを特徴とする橋体の制振装
    置。
    2. A bridge body fixed to a bridge body to be damped, extending outwardly of the bridge body in the bridge axis direction, and a portion outside the bridge body is made of a vibration damping element contacting the ground with a sliding surface. Vibration control device.
JP14055094A 1994-06-22 1994-06-22 Bridge body damping device Expired - Fee Related JP2746834B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14055094A JP2746834B2 (en) 1994-06-22 1994-06-22 Bridge body damping device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14055094A JP2746834B2 (en) 1994-06-22 1994-06-22 Bridge body damping device

Publications (2)

Publication Number Publication Date
JPH0813416A JPH0813416A (en) 1996-01-16
JP2746834B2 true JP2746834B2 (en) 1998-05-06

Family

ID=15271288

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14055094A Expired - Fee Related JP2746834B2 (en) 1994-06-22 1994-06-22 Bridge body damping device

Country Status (1)

Country Link
JP (1) JP2746834B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105274936B (en) * 2015-11-20 2017-09-22 长安大学 A kind of vibration suppression method and device of control bridge tower vibrations

Also Published As

Publication number Publication date
JPH0813416A (en) 1996-01-16

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