JPH0830509B2 - Vibration control device for tower structures - Google Patents
Vibration control device for tower structuresInfo
- Publication number
- JPH0830509B2 JPH0830509B2 JP63317028A JP31702888A JPH0830509B2 JP H0830509 B2 JPH0830509 B2 JP H0830509B2 JP 63317028 A JP63317028 A JP 63317028A JP 31702888 A JP31702888 A JP 31702888A JP H0830509 B2 JPH0830509 B2 JP H0830509B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- liquid
- cross
- tower
- vibration damping
- 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 - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 36
- 238000013016 damping Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000005192 partition Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、長大吊橋や斜張橋の塔、長高煙突、高層
建物、観光用タワーなどの塔状構造物において、風圧や
地震による同構造物の振動を可及的に減衰せしめる制振
装置に関し、さらに詳しくは、液体のスロッシング現象
を利用した制振装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to tower-like structures such as towers of long suspension bridges and cable-stayed bridges, long high chimneys, high-rise buildings, tourist towers, etc. More particularly, the present invention relates to a vibration damping device that utilizes the sloshing phenomenon of a liquid.
［従来技術およびその問題点］ 液体のスロッシング現象を利用したダンパーにおい
て、その制振効果を向上させるには、槽内に液体の粘性
抵抗を増大させる必要がある。従来、このような手段と
しては、粘性の大きい液体を用いる方法や、液槽に液体
の粘性抵抗を増大させる抵抗板を内装する方法が知られ
ている。[Prior Art and its Problems] In a damper utilizing the sloshing phenomenon of liquid, it is necessary to increase the viscous resistance of the liquid in the tank in order to improve the vibration damping effect. Heretofore, as such means, there have been known a method of using a highly viscous liquid and a method of incorporating a resistance plate for increasing the viscous resistance of the liquid in a liquid tank.
しかし、これらの方法では、所期の制振効果を発揮さ
せることはできない。However, these methods cannot exert the desired damping effect.
この発明は、簡単な構造で優れた制振効果を発揮する
ことができる塔状構造物の制振装置を提供することを目
的とするものであって、液槽に液体の粘性抵抗を増大さ
せる抵抗部材を内装する方法において、抵抗部材として
特定の形状を有する複数の部材を用いて成るものであ
る。It is an object of the present invention to provide a vibration damping device for a tower-like structure that can exhibit excellent vibration damping effect with a simple structure, and increases viscous resistance of liquid in a liquid tank. In the method of incorporating the resistance member, a plurality of members having a specific shape are used as the resistance member.
［問題点の解決手段］ この発明による塔状構造物の制振装置は、上記目的の
達成のために、塔状構造物の所要高さに設けられる液槽
に、液体の粘性抵抗を増大させる抵抗部材が内装されて
いる制振装置において、抵抗部材として複数本の横断面
十字状の柱状物が配設されていることを特徴とする。[Means for Solving Problems] In order to achieve the above-mentioned object, the vibration damping device for a tower-like structure increases the viscous resistance of a liquid in a liquid tank provided at a required height of the tower-like structure. In a vibration damping device in which a resistance member is installed, a plurality of columnar members having a cross-shaped cross section are arranged as the resistance member.
液槽の設置位置は、塔状構造物の頂部ないしその付近
の適当な部位である。The installation position of the liquid tank is an appropriate portion at or near the top of the tower-like structure.
横断面十字状の柱状物の本数は、その設置位置および
サイズにもよるが、通常は３〜90本程度である。但し、
この数は限定的なものではない。The number of pillars having a cross-shaped cross section depends on the installation position and size, but is usually about 3 to 90. However,
This number is not limiting.
横断面十字状の柱状物の設置位置は液槽の形状にもよ
るが、液槽が例えば直方体である場合、柱状物は液槽の
幅方向に設けられる。Although the installation position of the columnar object having a cross shape in cross section depends on the shape of the liquid tank, when the liquid tank is, for example, a rectangular parallelepiped, the columnar object is provided in the width direction of the liquid tank.
液槽には横断面十字状の柱状物の外に必要に応じて仕
切板、格子板、多孔板などが設けられてもよい。この仕
切板によって液槽内における貯液部の長さを設定するこ
とができる。A partition plate, a grid plate, a perforated plate, etc. may be provided in the liquid tank in addition to the columnar member having a cross-shaped cross section, if necessary. With this partition plate, the length of the liquid storage portion in the liquid tank can be set.
［作用］ 塔状構造物の所要高さに設けられる槽内に、抵抗部材
として複数本の横断面十字状の柱状物が配設されている
ので、塔状構造物に加えられる振動外力により槽内の液
体がスロッシングすると、液体が横断面十字状の柱状物
に衝突して大きなうずを生じ、これによって液体の運動
エネルギーが消費される。即ち、横断面十字状の柱状物
の設置によって、液体の粘性抵抗が大巾に増大され、そ
の結果制振効果の向上が達成される。[Operation] Since a plurality of pillars having a cross-shaped cross section are arranged as resistance members in the tank provided at the required height of the tower-shaped structure, the tank is oscillated by the vibration external force applied to the tower-shaped structure. When the liquid therein sloshing, the liquid collides with a columnar member having a cruciform cross section to generate a large vortex, which consumes the kinetic energy of the liquid. That is, the viscous resistance of the liquid is greatly increased by the installation of the columnar member having a cross-shaped cross section, and as a result, the vibration damping effect is improved.
［実施例］ この発明をさらに具体的に説明するために、この発明
の実施例を挙げる。[Examples] In order to more specifically describe the present invention, examples of the present invention will be given.
実施例１ 第１図において、やぐら状の塔状構造物（１）の頂部
に、直方体の液槽（２）が固着されている。液槽（２）
内の両端部にはそれぞれ端壁に平行に仕切板（３）が設
けられている。これら一対の仕切板（３）は槽長方向に
移動可能であって、これらによって槽長が調整される。Example 1 In FIG. 1, a rectangular parallelepiped liquid tank (2) is fixed to the top of a tower-shaped tower structure (1). Liquid tank (2)
A partition plate (3) is provided at each of both ends in parallel to the end wall. The pair of partition plates (3) are movable in the tank length direction, and the tank length is adjusted by these.
液槽（２）内において一対の仕切板（３）の間に横断
面十字状の９本の柱状物（４）が立設されている。これ
らは、槽長をほぼ３等分すると考えてその両端部および
中央部にそれぞれ３本ずつ巾方向に等間隔で配置されて
いる。液槽（２）には所要高さまで水が貯えられてい
る。In the liquid tank (2), nine pillars (4) having a cross-shaped cross section are erected between a pair of partition plates (3). Considering that the tank length is divided into approximately three equal parts, three pieces are arranged at equal intervals in the width direction at both ends and the central part. Water is stored in the liquid tank (2) up to the required height.
横断面十字状の柱状物（４）の配置の例としては、第
３図（イ）〜（ヘ）に示すものがある。すなわち、同図
（イ）では３本の柱状物（４）が槽長の中央部において
巾方向に等間隔で配置されている。同図（ロ）の配置は
第１図の配置とほぼ同じである。同図（ハ）では12本の
柱状物（４）が設けられている。これらは、槽長をほぼ
３等分すると考えてその両端部および中央部にそれぞれ
４本ずつ巾方向に等間隔で配置されている。同図（ニ）
では23本の柱状物（４）が設けられている。これらは、
槽長をほぼ５等分すると考えて一端側から奇数番目の位
置にそれぞれ５本ずつ巾方向に等間隔で配置され、一端
から偶数番目の位置にそれぞれ４本ずつ巾方向に等間隔
で配置されている。同図（ホ）では41本の柱状物（４）
が設けられている。これらは、槽長をほぼ９等分すると
考えて一端側から奇数番目の位置にそれぞれ５本ずつ巾
方向に等間隔で配置され、一端から偶数番目の位置にそ
れぞれ４本ずつ巾方向に等間隔で配置されている。同図
（ヘ）では85本の柱状物（４）が設けられている。これ
らは、槽長をほぼ19等分すると考えて一端側から奇数番
目の位置にそれぞれ５本ずつ巾方向に等間隔で配置さ
れ、一端から偶数番目の位置にそれぞれ４本ずつ巾方向
に等間隔で配置されている。As an example of the arrangement of the columnar member (4) having a cross-shaped cross section, there is one shown in FIGS. That is, in FIG. 4A, three columnar members (4) are arranged at equal intervals in the width direction at the center of the tank length. The arrangement of FIG. 2B is almost the same as the arrangement of FIG. In the same figure (c), 12 columns (4) are provided. Considering that the tank length is divided into approximately three equal parts, four are arranged at equal intervals in the width direction at both ends and the central part. Same figure (d)
In, 23 columnar objects (4) are provided. They are,
Considering that the tank length is divided into 5 equal parts, 5 pieces each are arranged at equal positions in the width direction at the odd-numbered positions from one end, and 4 pieces are arranged at equal intervals in the width direction at each even-numbered position from the one end. ing. In the figure (e), 41 columns (4)
Is provided. Considering that the tank length is divided into about 9 equal parts, 5 pieces are arranged at equal positions in the width direction from the one end side, and 5 pieces are arranged at equal intervals in the width direction. It is located in. In the same figure (f), 85 pillars (4) are provided. Considering that the tank length is divided into approximately 19 equal parts, 5 pieces are arranged at equal intervals in the width direction from one end side, and 5 pieces are arranged at equal intervals in the width direction. It is located in.
いま槽長（対象とする振動方向）を（ａ）とし、水深
を（ｈ）とし、液槽（２）の槽巾を（ｂ）とすると、液
体のスロッシング周波数（fs）は次式（１）で求められ
る。Assuming that the tank length (target vibration direction) is (a), the water depth is (h), and the tank width of the liquid tank (2) is (b), the sloshing frequency (fs) of the liquid is given by the following equation (1) ) Is required.
ここで、ｇは重力加速度、αはπ/aである。 Here, g is gravitational acceleration, and α is π / a.
そこで、このスロッシング周波数（fs）を当該塔状構
造物の固有振動数（fT）にほぼ一致させるように槽長
（ａ）と水深（ｈ）を設定し、スロッシング時に運動す
る水の量を確保できるように槽巾（ｂ）を決定する。槽
巾（ｂ）に制限があるときには、ｂ＝nb′を満たす槽巾
（ｂ′）を有する液槽ｎ台で、上記液槽を代替させるこ
ともできる。Therefore, the tank length (a) and the water depth (h) are set so that the sloshing frequency (fs) is almost equal to the natural frequency (f T ) of the tower structure, and the amount of water moving during sloshing is set. Determine the tank width (b) so that it can be secured. When the tank width (b) is limited, n liquid tanks having a tank width (b ′) satisfying b = nb ′ can replace the above liquid tank.
一対の仕切板（３）の移動によって槽長（ａ）を変化
させ、これに伴って当該塔状構造物の固有振動数（fT）
に応じてスロッシング周波数（fs）を調整する。水深
（ｈ）＝80cmのとき、槽長（ａ）とスロッシング周波数
（fs）の関係は、第２図に示すとおりである。The tank length (a) is changed by the movement of the pair of partition plates (3), and the natural frequency (f T ) of the tower structure is accordingly changed.
Adjust the sloshing frequency (fs) accordingly. When the water depth (h) = 80 cm, the relationship between the tank length (a) and the sloshing frequency (fs) is as shown in FIG.
第３図（イ）〜（ヘ）に示す配置で横断面十字状の柱
状物を設けた場合、および同柱状物を設けずに液槽内に
水のみを貯えた場合について、それぞれ、制振装置担体
で（すなわち同装置を塔状構造物に設けるのではなく、
制振装置のみを用いて）、スロッシング時の波高の共振
応答曲線を求めた。ここで槽長は120cm、槽巾は300cm、
水深は15cm、加振振幅（Ｘ）は1mm、水の波高はηと
し、また柱状物の高さは27cm、その十字巾は3cmとす
る。The vibration damping was carried out in the case where the cross-section cross-shaped columnar article was provided in the arrangement shown in FIGS. 3 (a) to (f), and in the case where only the water was stored in the liquid tank without providing the columnar article. In the device carrier (ie, rather than installing the device in a tower structure,
The resonance response curve of the wave height during sloshing was obtained using only the vibration damping device. Here, the tank length is 120 cm, the tank width is 300 cm,
The depth of water is 15 cm, the vibration amplitude (X) is 1 mm, the wave height of water is η, the height of the pillar is 27 cm, and the cross width is 3 cm.
スロッシング周波数と比（η/x）との関係を第４図に
示す。同図から明らかなように、横断面十字状の柱状物
の設置によって粘性抵抗が大巾に増大され、その結果制
振効果の向上が達成されることがわかる。The relationship between the sloshing frequency and the ratio (η / x) is shown in FIG. As is clear from the figure, the viscous resistance is greatly increased by the installation of the cross-shaped columnar object, and as a result, the vibration damping effect is improved.
つぎに、第５図に示すように、振動台（41）の上に高
さ155cmで横断面正方形（30cm×30cm）の塔モデル（4
2）を立設し、これの頂部に槽長および槽巾ともに30cm
の液槽（43）を設置し、同槽内に横断面十字状の柱状物
３本を立設し、同槽に水深5cmの水（44）を貯えた（質
量比＝3.2％）。振動台（41）の加振振巾をXmm、槽の振
幅をxmmとし、振動外力に対する塔状構造物の塔頂にお
ける変位の共振応答曲線を求めた。また、上記槽に水の
みを貯えて柱状物を設置しない場合、および上記制振装
置を設置しない場合についても、上記同じように共振応
答曲線を求めた。Next, as shown in Fig. 5, a tower model (4 cm) with a height of 155 cm and a square cross section (30 cm x 30 cm) is placed on the vibrating table (41).
2) is erected, and the tank length and tank width are 30 cm on the top of it.
The liquid tank (43) was installed, three pillars having a cross-shaped cross section were erected in the tank, and water (44) having a water depth of 5 cm was stored in the tank (mass ratio = 3.2%). With the vibration amplitude of the vibrating table (41) set to X mm and the amplitude of the tank set to x mm, the resonance response curve of the displacement at the top of the tower-like structure with respect to the external vibration force was obtained. Also, the resonance response curve was obtained in the same manner as above, even when only the water was stored in the tank and the columnar object was not installed, and when the vibration damping device was not installed.
スロッシング周波数と比（x/X）との関係を第６図に
示す。同図から明らかなように、横断面十字状の柱状物
の設置によって共振ピーク値が大巾に低減され、その結
果制振効果の向上が達成されることがわかる。The relationship between the sloshing frequency and the ratio (x / X) is shown in FIG. As is clear from the figure, the resonance peak value is significantly reduced by the installation of the cross-shaped cross-section columnar object, and as a result, the improvement of the vibration damping effect is achieved.
［発明の効果］ この発明の塔状構造物の制振装置によれば、抵抗部材
として複数本の横断面十字状の柱状物または複数枚の格
子板ないし多孔板を配設するので、塔状構造物に加えら
れる振動外力によりスロッシングした液体が横断面十字
状の柱状物に衝突して大きなうずを生じ、これによって
液体の運動エネルギーが消費されることにより、液体の
粘性抵抗が大巾に増大され、その結果制振効果の向上が
達成される。したがって、この発明によれば、簡単な構
造で優れた制振効果を発揮することができる。[Advantages of the Invention] According to the vibration damping device for a tower-like structure of the present invention, since a plurality of columnar members having a cross-shaped cross section or a plurality of lattice plates or perforated plates are arranged as the resistance member, the tower-like structure is provided. The vibrating resistance of the liquid is greatly increased by the sloshing liquid colliding with the cross-shaped cross-shaped column due to the vibration external force applied to the structure and generating a large eddy, which consumes the kinetic energy of the liquid. As a result, the improvement of the vibration damping effect is achieved. Therefore, according to the present invention, an excellent vibration damping effect can be exhibited with a simple structure.
第１図はこの発明の実施例を示す制振装置の斜視図、第
２図は槽長とフロッシング周波数との関係を示すグラ
フ、第３図（イ）（ロ）（ハ）（ニ）（ホ）（ヘ）は、
柱状物の配置状態を示す平面図、第４図はスロッシング
周波数と比（η/X）との関係を示すグラフ、第５図は塔
モデルを示す正面図、第６図はスロッシング周波数と比
（x/X）との関係を示すグラフである。 （１）……塔状構造物、（２）……液槽、（３）……仕
切板、（４）……柱状物。FIG. 1 is a perspective view of a vibration damping device showing an embodiment of the present invention, FIG. 2 is a graph showing the relationship between tank length and flossing frequency, and FIG. 3 (a) (b) (c) (d) ( (E) (f)
FIG. 4 is a front view showing a tower model, FIG. 6 is a slanting frequency vs. ratio (η / X) graph, FIG. (x / X) is a graph showing the relationship with x. (1) ... tower-like structure, (2) ... liquid tank, (3) ... partition plate, (4) ... columnar object.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 南條 正洋 大阪府大阪市西区江戸堀１丁目６番14号 日立造船株式会社内 (72)発明者 有馬 健次 大阪府大阪市西区江戸堀１丁目６番14号 日立造船株式会社内 (72)発明者 加道 博章 大阪府大阪市西区江戸堀１丁目６番14号 日立造船株式会社内 (56)参考文献 特開 昭62−292943（ＪＰ，Ａ) 特開 平１−131769（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Nanjo 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Kenji Arima 1-16-1 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd. (72) Inventor Hiroaki Kado 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Inside Hitachi Shipbuilding Co., Ltd. (56) Reference JP-A-62-292943 (JP, A) JP-A-1 -131769 (JP, A)
Claims (1)
液体の粘性抵抗を増大させる抵抗部材が内装されている
制振装置において、抵抗部材として複数本の横断面十字
状の柱状物が配設されていることを特徴とする、塔状構
造物の制振装置。1. A tank provided at a required height of a tower-shaped structure,
In a vibration damping device in which a resistance member for increasing the viscous resistance of a liquid is installed, a plurality of pillars having a cross-shaped cross section are arranged as the resistance member. Shaking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317028A JPH0830509B2 (en) | 1988-12-15 | 1988-12-15 | Vibration control device for tower structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63317028A JPH0830509B2 (en) | 1988-12-15 | 1988-12-15 | Vibration control device for tower structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02163535A JPH02163535A (en) | 1990-06-22 |
| JPH0830509B2 true JPH0830509B2 (en) | 1996-03-27 |
Family
ID=18083620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63317028A Expired - Lifetime JPH0830509B2 (en) | 1988-12-15 | 1988-12-15 | Vibration control device for tower structures |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830509B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002213105A (en) * | 2001-01-16 | 2002-07-31 | Ishikawajima Harima Heavy Ind Co Ltd | Self-supporting chimney damping structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62292943A (en) * | 1986-06-10 | 1987-12-19 | Mitsubishi Heavy Ind Ltd | Dynamic vibration reducer |
| JPH0756191B2 (en) * | 1987-11-17 | 1995-06-14 | 清水建設株式会社 | Vibration suppression device for structures |
-
1988
- 1988-12-15 JP JP63317028A patent/JPH0830509B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02163535A (en) | 1990-06-22 |
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