JP3346132B2 - How to prevent bridge gutter flutter - Google Patents
How to prevent bridge gutter flutterInfo
- Publication number
- JP3346132B2 JP3346132B2 JP29644895A JP29644895A JP3346132B2 JP 3346132 B2 JP3346132 B2 JP 3346132B2 JP 29644895 A JP29644895 A JP 29644895A JP 29644895 A JP29644895 A JP 29644895A JP 3346132 B2 JP3346132 B2 JP 3346132B2
- Authority
- JP
- Japan
- Prior art keywords
- bridge girder
- flutter
- bridge
- cross
- present
- 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
Links
Landscapes
- Bridges Or Land Bridges (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、橋桁の耐風制振方
法に関し、特に橋桁のフラッタ防止方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a bridge girder against wind and, more particularly, to a method for preventing a bridge girder from fluttering.
【０００２】[0002]
【従来の技術】吊橋や斜張橋あるいは大スパンの連続梁
のような長径間の橋梁は、中小の橋梁に比べたわみやす
く、橋梁が側方あるいは斜方から強風をうけると、橋梁
の上下面に発生する渦により橋梁がねじれ方向に振動す
るフラッタと呼ばれる振動が生じることが知られてお
り、これは、自励振動と言われる振動現象の一種であ
り、かって、中央スパン８５３ｍの吊橋を破壊させたこ
とのある極めて破局的な振動現象である。2. Description of the Related Art Long span bridges, such as suspension bridges, cable-stayed bridges or large span continuous beams, are more flexible than small and medium-sized bridges. It is known that the vortex generated in the bridge causes vibration called flutter, in which the bridge vibrates in the torsional direction. This is a kind of vibration phenomenon called self-excited vibration, which destroys a suspension bridge with a central span of 853 m. It is a very catastrophic vibration phenomenon that has been caused.
【０００３】従来、当該フラッタ防止方法として、作用
空気力を低減させることを目的としたグレーティング床
版の採用が公知の技術となっている他、特開昭６１ー２
１６９０８号公報（以下、先行例１という。）に示すよ
うに、中央分離帯付近に障害物を設けるセンターバリヤ
方式や、特開昭６１ー２１１４０６号公報（以下、先行
例２という。）に示す橋桁の基本設計断面が非流線型で
あるときに整流板を設けたもの、あるいは、特開平６ー
２００９７７号公報（以下、先行例３という。）に示す
ように橋桁の振動に合わせてフラップ等の整流板をアク
ティブに駆動させる方法、が公知である。Conventionally, as a method for preventing such flutter, the use of a grating floor slab for reducing the working air force has been a known technique.
As shown in Japanese Patent No. 16908 (hereinafter referred to as "Prior Art 1"), a center barrier method in which an obstacle is provided in the vicinity of the median strip, and in Japanese Patent Application Laid-Open No. 61-21406 (hereinafter referred to as "Prior Art 2"). A rectifying plate is provided when the basic design cross section of the bridge girder is a non-streamline type, or a flap or the like is provided in accordance with the vibration of the bridge girder as disclosed in Japanese Patent Application Laid-Open No. 6-200977 (hereinafter referred to as Prior Example 3). A method of actively driving a current plate is known.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
フラッタ防止方法は、フラッタが発生する風速を高速側
に移し、安全性を高める効果があるものの、それぞれ解
決すべき課題を有している。However, the conventional method for preventing flutter has the effect of shifting the wind speed at which flutter occurs to a high speed side and improving the safety, but each has problems to be solved.
【０００５】前記従来技術におけるグレーティング床版
および先行例１に示すセンターバリヤ方式の採用は、車
両走行性の悪化、運転席からの視界の悪化を招く問題が
ある。[0005] The use of the grating floor slab in the prior art and the center barrier system shown in the prior art example 1 has a problem that the vehicle traveling performance deteriorates and the visibility from the driver's seat deteriorates.
【０００６】前記先行例２に示す橋桁の基本設計断面が
非流線型であるときに整流板を設けたものは、整流板の
取付けにかなりの工期とコストを要する他、相対風速に
よる剥離渦が発生するため、フラッタ防止についても効
果が充分でなく、問題がある。In the bridge girder shown in the preceding example 2 in which the basic design cross section is non-streamline type and the current plate is provided, it takes a considerable time and cost to install the current plate, and a separation vortex is generated due to the relative wind speed. Therefore, the effect of preventing flutter is not sufficient and there is a problem.
【０００７】さらに、前記先行例３に示すように橋桁の
振動に合わせてフラップ等の整流板をアクティブに駆動
させる方法においては、装置が複雑であり、膨大な工期
とコスト増をまねく問題がある。Further, in the method of actively driving a current plate such as a flap according to the vibration of a bridge girder as shown in the above-mentioned prior example 3, the apparatus is complicated, and there is a problem that an enormous construction period and cost increase are caused. .
【０００８】本発明は前述の問題点を解決し車両走行性
や視界の悪化を招くことなく、簡易な方法にてフラッタ
を効果的に防止する方法を提供するものである。The present invention solves the above-mentioned problems and provides a method for effectively preventing flutter by a simple method without deteriorating the vehicle running performance and visibility.
【０００９】[0009]
【課題を解決するための手段】前述の課題は、以下の手
段により達成される。 １．橋桁の橋軸方向両側部に設けられた支持アーム先端
において橋長方向にわたり張設された索体に、該索体を
支点として揺動するように、可撓性の整流体を係止し、
該整流体を風圧の作用により柔軟に変形させ、振動状態
に応じた流線型断面を形成せしめ、剥離渦の生成を防止
することを特徴とする橋桁のフラッタ防止方法。 Means for Solving the Problems The above-mentioned problem is solved by the following means.
Achieved by steps. 1. Ends of support arms provided on both sides of the bridge girder in the bridge axis direction
The rope is stretched over the bridge length direction at
Lock the flexible rectifier so that it swings as a fulcrum,
The rectifier is flexibly deformed by the action of wind pressure,
To form a streamlined cross section according to the conditions, preventing the generation of separation vortices
A method for preventing flutter of a bridge girder.
【００１０】フラッタは、橋桁の前縁部で生成された剥
離渦が風下側に流下していく間にねじれ変形が進み、橋
桁の風下部が上方に変形しようとするタイミングのとき
に、流下してきた剥離渦にさらに上方へ引っ張られると
いう、いわゆる自励力が作用することにより生じる。つ
まり、橋桁の前縁部で生じる大きな剥離渦が、フラッタ
発生の要因になっている。[0010] The flutter flows down when the separation vortex generated at the leading edge of the bridge girder is torsionally deformed while flowing downwindward, and the leeward portion of the bridge girder is deformed upward. The so-called self-exciting force acts on the separated vortex, which is further pulled upward. That is, the large separation vortex generated at the leading edge of the bridge girder causes flutter.
【００１１】しかるに、フラッタ発生の可能性がある風
速においては、その風圧作用により、風上側の整流体が
変形し、振動状態に応じた流線型断面が構成されること
により剥離渦の生成が防止され、フラッタ発生が防止さ
れる。However, at a wind speed at which flutter is likely to occur, the rectifier on the windward side is deformed by the wind pressure action, and a streamlined cross section is formed according to the vibration state, thereby preventing generation of separation vortex. And flutter generation is prevented.
【００１２】[0012]
【発明の実施の形態】図１（ａ）（ｂ）は、本発明の橋
桁のフラッタ防止方法に関する第一の実施の形態に関す
る橋桁の横断面図で、１は橋桁である。２、２は複数の
整流体で、該橋桁１の橋軸方向両側部に複数設けられた
支持アーム３、３を介して取付けられており、布、合成
樹脂等からなる可撓性の材料で構成されている。該整流
体２、２は支持アーム３の先端で橋長方向にわたり張設
されたロープ、ワイヤ等の索体４に係止されている。1 (a) and 1 (b) are cross-sectional views of a bridge girder relating to a first embodiment of a method for preventing flutter of a bridge girder according to the present invention, wherein 1 is a bridge girder. Reference numerals 2 and 2 denote a plurality of rectifiers, which are attached via a plurality of support arms 3 and 3 provided on both sides in the bridge axis direction of the bridge girder 1 and are made of a flexible material such as cloth, synthetic resin, or the like. It is configured. The rectifiers 2 and 2 are fixed to ropes 4 such as ropes and wires that are stretched over the bridge length direction at the ends of the support arms 3.
【００１３】図１（ａ）は、無風状態であり、整流体
２、２は垂下状態にある。図１（ｂ）は、横風状態であ
り、整流体２、２は索体４を軸として風下側が上下方向
に揺動する。FIG. 1A shows a windless state, and the rectifiers 2 and 2 are in a hanging state. FIG. 1B shows a crosswind state, in which the rectifiers 2 and 2 swing vertically on the leeward side with the rope 4 as an axis.
【００１４】図２は、図１（ｂ）の平面図で、整流体２
は支持アーム３、３の間に分割して配置されており、分
割的に揺動する。FIG. 2 is a plan view of FIG.
Is divided between the support arms 3 and swings in a divided manner.
【００１５】図３は、本発明の橋桁のフラッタ防止方法
に関する第二の実施の形態に関する横断面図で、橋桁１
の橋軸方向の両側部に複数の支持アーム３が前述の図１
と同様に取付けられており、該支持アーム３間に軸体
５、５が張設されており、該軸体５に軽量なパネル状の
整流体６の基部環６′が嵌合している。FIG. 3 is a cross-sectional view showing a second embodiment of a method for preventing flutter of a bridge girder according to the present invention.
A plurality of support arms 3 are provided on both sides in the bridge axis direction of FIG.
The shafts 5 and 5 are stretched between the support arms 3, and the base ring 6 ′ of the lightweight panel-shaped rectifier 6 is fitted to the shaft 5. .
【００１６】図４は、図３の平面図で、従って、図３の
如く横風が橋桁１に作用すると整流体６は軸体５を中心
として風下側が上下に揺動し、振動状態に応じた流線型
断面が構成され剥離渦の生成が抑制される。FIG. 4 is a plan view of FIG. 3. Therefore, when a cross wind acts on the bridge girder 1 as shown in FIG. 3, the rectifying body 6 swings up and down on the shaft 5 around the shaft body 5, and responds to the vibration state. A streamlined cross section is formed, and generation of separation vortices is suppressed.
【００１７】図５は、本発明の第一の実施形態である可
撓性の整流体２を矩形箱型断面の橋桁１に取り付けた実
施形態を示す横断面図である。尚、１ａは高欄、１ｂは
地覆である。FIG. 5 is a cross-sectional view showing a first embodiment of the present invention in which a flexible straightening body 2 is attached to a bridge girder 1 having a rectangular box-shaped cross section. In addition, 1a is a row and 1b is a ground cover.
【００１８】可撓性の整流体２は無風状態では垂れ下が
っているが、フラッタが発生するような高風速作用下で
は風圧の作用により変形し流線型断面が構成され剥離渦
の生成が抑制される。Although the flexible rectifier 2 hangs down in a windless state, it is deformed by the action of wind pressure under a high wind speed in which flutter is generated, and a streamlined cross section is formed to suppress generation of separation vortices.
【００１９】図６は、本発明の第一の実施形態である可
撓性の整流体２を流線型箱型断面の橋桁１に取り付けた
実施形態を示す横断面図であり、前述と同様なフラッタ
防止の効果をもたらす。FIG. 6 is a cross-sectional view showing a first embodiment of the present invention in which a flexible rectifier 2 is attached to a bridge girder 1 having a streamlined box-shaped cross section. It has the effect of prevention.
【００２０】図７は、橋桁１に横風が作用した場合の橋
桁１の揺れに対して、本発明の場合と対策なしの従来技
術とを比較した横断面図である。FIG. 7 is a cross-sectional view showing a comparison between the case of the present invention and the prior art without any countermeasures against shaking of the bridge girder 1 when a cross wind acts on the bridge girder 1.
【００２１】時刻ｔ0 においての従来技術（ａ）では橋
桁１の上面に剥離渦が発生するが、本発明（ｂ）では可
撓性の整流体２により剥離渦は発生しない。In the prior art (a) at time t 0 , the separation vortex is generated on the upper surface of the bridge girder 1, but in the present invention (b), the separation vortex is not generated by the flexible rectifier 2.
【００２２】時刻ｔ0 ＋Ｔ／４（Ｔは周期）においての
従来技術（ｃ）では橋桁１の上面に発生した剥離渦が流
下するが、本発明（ｄ）では剥離渦は存在しない。In the prior art (c) at time t 0 + T / 4 (T is a period), the separation vortex generated on the upper surface of the bridge girder flows down, but in the present invention (d), the separation vortex does not exist.
【００２３】時刻ｔ0 ＋Ｔ／２（Ｔは周期）においての
従来技術（ｅ）では橋桁１の上面を流下してきた剥離渦
は端部で橋桁１を上方へ持ち上げる作用が働き、同時
に、橋桁１の左端部下方に剥離渦が作用した左端部は下
方へ下げる作用が働くので自励力で橋桁１の揺れが増大
しフラッター現象が発生する。これに対し、本発明
（ｆ）では剥離渦は存在しないのでフラッターは生じな
い。In the prior art (e) at time t 0 + T / 2 (T is a cycle), the separation vortex flowing down the upper surface of the bridge girder 1 works to lift the bridge girder 1 upward at the end, and at the same time, the bridge girder 1 At the left end where the separation vortex acts below the left end of the slab, the lower end acts, and the self-excited force causes the sway of the bridge girder 1 to increase and the flutter phenomenon occurs. On the other hand, in the present invention (f), flutter does not occur because there is no separation vortex.
【００２４】図８は、テストに使用したモデル１（対策
なし）の横断面図を示し、図９は、本発明に関する橋桁
模型のモデル２の横断面図であり、橋桁模型１′の両側
部４０ｍｍに糸を張り、該糸に可撓性の整流体として幅
３５ｍｍのトレーシングペーパを使用して風洞実験を行
った。FIG. 8 is a cross-sectional view of Model 1 (no countermeasure) used for the test, and FIG. 9 is a cross-sectional view of Model 2 of the bridge girder model according to the present invention. A wind tunnel experiment was performed using a tracing paper having a width of 35 mm as a flexible straightening body with a thread stretched over 40 mm.
【００２５】実験条件は、モデル１、２の固有振動数ｆ
0 ＝２．１Ｈｚ、極慣性モーメントを２．３４２×１０
5 ｇ・ｃｍ・ｓ2 とした。The experimental conditions are the natural frequencies f of the models 1 and 2
0 = 2.1 Hz, polar inertia moment is 2.342 × 10
5 g · cm · s 2 .
【００２６】図１０は、本発明の場合の模型橋桁と対策
なしの橋桁模型とのテストによる結果を示すグラフで、
本発明のモデル２は、対策なしのモデル１に比べ、高風
速域で安定していることがわかる。FIG. 10 is a graph showing the test results of the model bridge girder and the bridge girder model without measures in the present invention.
It can be seen that the model 2 of the present invention is more stable in the high wind speed region than the model 1 without any measures.
【００２７】[0027]
【発明の効果】本発明は橋軸方向に沿い、かつ、橋桁か
ら外方に離隔した位置に整流体が設置されるので、車両
走行性や視界の悪化を招くことがない。According to the present invention, since the rectifier is installed at a position along the bridge axis direction and spaced apart from the bridge girder, the vehicle traveling performance and visibility are not deteriorated.
【００２８】また、設置される可撓性またはパネル状の
整流体は極めて軽量であり、設置構造も簡単であるので
コストは低廉であり、充分なフラッタ防止効果が得られ
る。Further, the flexible or panel-shaped rectifier to be installed is extremely lightweight and the installation structure is simple, so that the cost is low and a sufficient flutter prevention effect can be obtained.
【図１】（ａ）（ｂ）は、本発明の橋桁のフラッタ防止
方法に関する第一の実施の形態に関する橋桁の横断面図
である。FIGS. 1A and 1B are cross-sectional views of a bridge girder according to a first embodiment of a method for preventing flutter of a bridge girder according to the present invention.
【図２】図１（ｂ）の平面図である。FIG. 2 is a plan view of FIG. 1 (b).
【図３】本発明の橋桁のフラッタ防止方法に関する第二
の実施の形態に関する横断面図である。FIG. 3 is a cross-sectional view of a second embodiment of the method for preventing flutter of a bridge girder according to the present invention.
【図４】図３の平面図である。FIG. 4 is a plan view of FIG. 3;
【図５】本発明の第一の実施形態である可撓性の整流体
を矩形箱型断面の橋桁に取り付けた実施形態を示す横断
面図である。FIG. 5 is a cross-sectional view showing the first embodiment of the present invention, in which a flexible straightening body is attached to a bridge girder having a rectangular box-shaped cross section.
【図６】本発明の第一の実施形態である可撓性の整流体
を流線型箱型断面の橋桁に取り付けた実施形態を示す横
断面図である。FIG. 6 is a cross-sectional view showing the first embodiment of the present invention, in which a flexible straightening body is attached to a bridge girder having a streamlined box-shaped cross section.
【図７】橋桁１に横風が作用した場合の橋桁１の揺れに
対して、本発明の場合と対策なしの従来技術とを比較し
た横断面図である。FIG. 7 is a cross-sectional view comparing the case of the present invention and a conventional technique without a countermeasure against shaking of the bridge girder 1 when a cross wind acts on the bridge girder 1;
【図８】テストに使用したモデル１（対策なし）の横断
面図である。FIG. 8 is a cross-sectional view of Model 1 (without measures) used in the test.
【図９】本発明に関する橋桁模型のモデル２の横断面図
である。FIG. 9 is a cross-sectional view of Model 2 of the bridge girder model according to the present invention.
【図１０】本発明の場合の橋桁と対策なしの橋桁模型テ
ストによる結果を示すグラフである。FIG. 10 is a graph showing results of a bridge girder in the case of the present invention and a bridge girder model test without measures.
１ 橋桁 ２ 可撓性の整流体 ３ 支持アーム ４ 索体 ５ 軸体 ６ パネル状整流体 DESCRIPTION OF SYMBOLS 1 Bridge girder 2 Flexible rectifier 3 Support arm 4 Cord 5 Shaft 6 Panel rectifier
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−200977（ＪＰ，Ａ) 特開 昭61−211406（ＪＰ，Ａ) 特公 昭53−16217（ＪＰ，Ｂ２) 特公 昭51−17216（ＪＰ，Ｂ２) 実公 昭47−14360（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.7，ＤＢ名) E01D 1/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-200977 (JP, A) JP-A-61-211406 (JP, A) JP-B-53-16217 (JP, B2) JP-B-51- 17216 (JP, B2) Jikken 47-14360 (JP, Y1) (58) Field surveyed (Int. Cl. 7 , DB name) E01D 1/00
Claims (1)
アーム先端において橋長方向にわたり張設された索体
に、該索体を支点として揺動するように、可撓性の整流
体を係止し、該整流体を風圧の作用により柔軟に変形さ
せ、振動状態に応じた流線型断面を形成せしめ、剥離渦
の生成を防止することを特徴とする橋桁のフラッタ防止
方法。 1. Supports provided on both sides of a bridge girder in the bridge axis direction.
A cable spanned across the bridge length at the end of the arm
In addition, a flexible rectifier is provided so as to swing around the cable body.
The body is locked and the rectifier is flexibly deformed by the action of wind pressure.
To form a streamlined cross section according to the vibration state,
Of fluttering of bridge girder characterized by preventing generation of slab
Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29644895A JP3346132B2 (en) | 1995-11-15 | 1995-11-15 | How to prevent bridge gutter flutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29644895A JP3346132B2 (en) | 1995-11-15 | 1995-11-15 | How to prevent bridge gutter flutter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09137404A JPH09137404A (en) | 1997-05-27 |
| JP3346132B2 true JP3346132B2 (en) | 2002-11-18 |
Family
ID=17833684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29644895A Expired - Fee Related JP3346132B2 (en) | 1995-11-15 | 1995-11-15 | How to prevent bridge gutter flutter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3346132B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458881A (en) * | 2020-11-30 | 2021-03-09 | 大连理工大学 | Semi-active device for controlling bridge flutter |
| CN112458882A (en) * | 2020-11-30 | 2021-03-09 | 大连理工大学 | Flexible device for controlling bridge vortex vibration |
-
1995
- 1995-11-15 JP JP29644895A patent/JP3346132B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09137404A (en) | 1997-05-27 |
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