JPS62211406A - Method for vibrating structure - Google Patents
Method for vibrating structureInfo
- Publication number
- JPS62211406A JPS62211406A JP5253986A JP5253986A JPS62211406A JP S62211406 A JPS62211406 A JP S62211406A JP 5253986 A JP5253986 A JP 5253986A JP 5253986 A JP5253986 A JP 5253986A JP S62211406 A JPS62211406 A JP S62211406A
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- vibration
- vehicle
- obstacles
- period
- 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
- 238000000034 method Methods 0.000 title claims description 13
- 238000009434 installation Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 16
- 238000002474 experimental method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、橋梁などの長大構造物の振動実験に適用され
る加振方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration excitation method applied to vibration experiments of long structures such as bridges.
従来、橋梁などの構造物を加振する方法は種々の方法が
行なわれてきたが、本発明との関連で、代表的なものと
して次の2通9の方法を挙げる。Conventionally, various methods have been used to vibrate structures such as bridges, but the following two methods are listed as representative methods in relation to the present invention.
(11車輌による衝撃加振
橋梁の上を単に車輌が走行するだけでも、着干の振動が
発生する場合があるが、振動振幅が極めて小さ過ぎて実
験の加振方法としては殆んど適用できない。(Simply driving a vehicle on a bridge with impact vibration caused by 11 vehicles can cause drying vibrations, but the vibration amplitude is so small that it is hardly applicable as an excitation method for experiments. .
そこで、大きな加振力を得る方法として第2図に示すよ
うにトラックなどの重車輌3に障害物2を乗ル越えさせ
てその際に橋梁1に衝撃力を作用させる方法が用いられ
る事もあった。Therefore, as a method of obtaining a large excitation force, as shown in Fig. 2, a method may be used in which a heavy vehicle 3 such as a truck is driven over an obstacle 2 and an impact force is applied to the bridge 1 at that time. there were.
(2)起振機による加振
橋梁の上に起振機5を設置し、起振機が発生する力を橋
梁1に作用させる方法であり、従来の振動実験で最も多
く利用されている方法である。(2) Vibration by a vibrator This is a method in which a vibrator 5 is installed on the bridge and the force generated by the vibrator is applied to the bridge 1, and is the method most often used in conventional vibration experiments. It is.
起振機5は第3図に示すように、原理的には回転軸6に
偏心ウェイトW7’z取り付けこを利用するものが一般
的である。こ〜で、Wはウェイト重量、!は重力の加速
度、rはつエイトの軸心からの偏心距離、ωは回転の角
振動数である。As shown in FIG. 3, the vibration exciter 5 generally utilizes an eccentric weight W7'z attached to the rotating shaft 6 in principle. Here, W is the weight weight! is the acceleration of gravity, r is the eccentric distance from the axis of the eight, and ω is the angular frequency of rotation.
従来技術の問題点は次のような事が挙げられる。 Problems with the conventional technology include the following.
(1)車輌による衝撃加振
障害物の個数が1個であるため橋梁に作用する力が単独
の衝撃力のみで、これによる橋梁の振動応答振幅の発生
量は極めて小さく大きな応答振幅量は得られなかった。(1) Since the number of impact-exciting obstacles caused by a vehicle is one, the force acting on the bridge is only a single impact force, and the amount of vibration response amplitude generated by this is extremely small and a large response amplitude cannot be obtained. I couldn't.
又、単独の衝撃力の中には多くの周波数成分を同時に含
んでいるため、橋梁振動の多くの振動成分を同時に誘起
し、実験の対象とする振動成分以外の振動成分、即ち、
雑音を多く含んだ歪んだ振動波形となり実験精度も低下
する。In addition, since a single impact force contains many frequency components simultaneously, many vibration components of bridge vibration are simultaneously induced, and vibration components other than the vibration component targeted for the experiment, i.e.
This results in a distorted vibration waveform that contains a lot of noise, and the accuracy of the experiment decreases.
(2)起振機による加振
起振機加振の場合は加振力がF=!デω2となる。この
場合大きな加振力を得ようとするとウェイトの重量Wを
大きくするか、ウェイトの回転半径rを大きくすること
が必要となり、起振機の規模が大きいものが必要となる
。特に橋梁のように実験の対象となる振動の周期が長い
、耶ち角振動数ωが小さい範囲では、加振力が著しく小
さくなる欠点がある。(2) Excitation by an exciter In the case of exciter excitation, the excitation force is F=! It becomes deω2. In this case, in order to obtain a large excitation force, it is necessary to increase the weight W of the weight or the rotation radius r of the weight, and a large-scale exciter is required. In particular, in a range where the vibration period is long and the helical angular frequency ω is small, such as in a bridge, the excitation force becomes significantly small.
又、起振機の場合、駆動源として通常モータが使用され
るため、大きな加振力を得るためには、大出力のモータ
が必要とな)、一般の橋梁には電力設備を有しない事か
ら起振機駆動のだめの電カニ事を必要とする。In addition, in the case of an exciter, a motor is usually used as the drive source, so in order to obtain a large excitation force, a high-output motor is required), and ordinary bridges do not have electric power equipment. It requires an electric crab with an exciter drive.
橋梁の上面に複数個以上の障害物を適当な間隔を置いて
連続的に設置し、この上を車輌を一定速度で走行させ橋
梁に連続的に衝撃力を作用させる。A plurality of obstacles or more are successively installed on the top surface of a bridge at appropriate intervals, and a vehicle is run on the obstacles at a constant speed to continuously apply an impact force to the bridge.
この時、障害物の設置間隔と車輌の走行速度の関係を調
整し、車輌が隣接する障害物を乗り越え通過する時間々
隔(周期]が橋梁の固有周期に一致、又は固有周期の整
数倍に一致するようにする。At this time, the relationship between the installation interval of obstacles and the vehicle's running speed is adjusted so that the time interval (period) at which the vehicle passes over the adjacent obstacles matches the natural period of the bridge, or is an integral multiple of the natural period. make it match.
橋梁の固有周期に同調した大きな衝撃力を連続的に橋梁
に作用させる事によシ、橋梁の振動振幅は除々に成長し
て大きな振動振幅が得られる。By continuously applying a large impact force synchronized to the natural period of the bridge to the bridge, the vibration amplitude of the bridge gradually grows and a large vibration amplitude can be obtained.
第1図telに実施例を示す。 An example is shown in FIG.
橋梁1の上面に障害物2を4列並べて設置した例である
。車輌’3t−進行方向4の方向にはy定速で走行させ
障害物2を順次乗p越えていく。This is an example in which four rows of obstacles 2 are installed on the top surface of a bridge 1. The vehicle is caused to travel at a constant speed y in the traveling direction 4, passing over obstacles 2 one after another.
この時、橋梁の固有周期をT(秒)をすれば、車輌の走
行速度を調整して車輌が隣接する障害物を通過する時間
々隔がはrT(秒)になる様にする。At this time, if the natural period of the bridge is T (seconds), the traveling speed of the vehicle is adjusted so that the time interval at which the vehicle passes an adjacent obstacle is rT (seconds).
第1図<6)はこれにより橋梁に作用する加振力を模式
的に示した図であり、周期T(秒)の間隔で力が作用す
る。FIG. 1<6) is a diagram schematically showing the excitation force that acts on the bridge due to this, and the force acts at intervals of period T (seconds).
第2図(c+lは、この加振力を受けた場合の橋梁の振
動応答を模式的に示したものであり、周期で(秒)の振
動成分が同調して除々に大きく成長していく。Figure 2 (c+l) schematically shows the vibration response of the bridge when it receives this excitation force, and the vibration components of the period (seconds) synchronize and gradually grow larger.
車輌が障害物を乗り越えた際の衝撃力を連続的に橋梁に
作用させ、かつその衝撃力の作用する時間々隔を橋梁の
固有振動周期に同調させる事によシ、実験の対象とする
橋梁の振動振幅を大きく誘起することかできる。By applying the impact force generated when a vehicle overcomes an obstacle to the bridge continuously, and by synchronizing the time interval at which the impact force acts to the natural vibration period of the bridge, we created a bridge that was the subject of an experiment. It is possible to induce a large vibration amplitude.
従来の方法と比較し、大きな橋梁の振動振幅を手軽に誘
起できる。Compared to conventional methods, it is possible to easily induce large vibration amplitudes in bridges.
第1図(Aは本発明の一実施例としての側面図、同図(
61は同図(cL)の実施例によって橋梁に作用する加
振力を模式的に示した図、又、同図(e)は同図(bl
の加振力を受けた場合の橋梁の振動応答を模式的に示し
た図である。
第2図は車輌による従来の加振方法を示し、第3図は起
振機による従来の加振方法を示す。
1・・・橋梁、 2・・・障害物、 3・・・
車輌4・・・車輌の走行方向
復代理人 弁理士 岡 本 重 文
外2名
第3図Fig. 1 (A is a side view as an embodiment of the present invention;
61 is a diagram schematically showing the excitation force acting on the bridge according to the embodiment of the same figure (cL), and the same figure (e) is a diagram schematically showing the excitation force acting on the bridge according to the embodiment of the same figure (cL).
FIG. 2 is a diagram schematically showing the vibration response of a bridge when subjected to an excitation force of . FIG. 2 shows a conventional vibration excitation method using a vehicle, and FIG. 3 shows a conventional vibration excitation method using a vibrator. 1... Bridge, 2... Obstacle, 3...
Vehicle 4...Vehicle travel direction Sub-agent Patent attorney Shige Okamoto 2 persons Figure 3
Claims (1)
をあけて設置しその上を車輌を一定速度で走行させ、 前記障害物の設置間隔距離と車輌の走行速度の関係を調
整し、車輌が障害物を乗り越え通過する時間間隔(周期
)が構造物の固有周期、又は固有周期の整数倍に一致す
るようにしたことを特徴とする構造物加振方法。[Scope of Claims] A plurality of obstacles are installed at predetermined intervals on the upper surface of a long structure such as a bridge, and a vehicle is run over the obstacles at a constant speed, and the distance between the installation intervals of the obstacles and the vehicle's running speed are determined. A method for exciting a structure, characterized in that the relationship is adjusted so that the time interval (period) during which a vehicle passes over an obstacle matches the natural period of the structure or an integral multiple of the natural period.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5253986A JPS62211406A (en) | 1986-03-12 | 1986-03-12 | Method for vibrating structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5253986A JPS62211406A (en) | 1986-03-12 | 1986-03-12 | Method for vibrating structure |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62211406A true JPS62211406A (en) | 1987-09-17 |
Family
ID=12917579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5253986A Pending JPS62211406A (en) | 1986-03-12 | 1986-03-12 | Method for vibrating structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62211406A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010229807A (en) * | 2009-03-26 | 2010-10-14 | Accuracy Technology Corp | Method of evaluating safety of bridge by vibration measurement |
-
1986
- 1986-03-12 JP JP5253986A patent/JPS62211406A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010229807A (en) * | 2009-03-26 | 2010-10-14 | Accuracy Technology Corp | Method of evaluating safety of bridge by vibration measurement |
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