CN114922049A - Control device for restraining wind vibration of bridge - Google Patents
Control device for restraining wind vibration of bridge Download PDFInfo
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- CN114922049A CN114922049A CN202210286868.7A CN202210286868A CN114922049A CN 114922049 A CN114922049 A CN 114922049A CN 202210286868 A CN202210286868 A CN 202210286868A CN 114922049 A CN114922049 A CN 114922049A
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- 230000000452 restraining effect Effects 0.000 title claims description 4
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000013017 mechanical damping Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention mainly relates to a control method of bridge structure wind vibration, which is used for inhibiting the divergent amplitude vibration phenomenon caused by the fact that the energy input by aerodynamic force under high wind speed is larger than the energy dissipated by mechanical damping of a bridge structure system. The method is realized by installing the symmetrical air nozzles on the simplified bridge model, and the large-scale vortex shedding caused by unstable distribution of the bridge wake velocity can be improved. The aerodynamic shape of the bridge is changed by installing the air nozzle at the windward side of the cross section of the bridge, so that the effects of reducing resistance and improving the aerodynamic stability of the bridge are achieved.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a passive control device for inhibiting wind vibration of a bridge.
Background
Wind-induced vibration is an important factor affecting the safety and the service performance of the large-span bridge. With the gradual lifting of modern bridge span, the structure fatigue can be caused to the bridge vibrations, reduces its aerodynamic stability. The inhibition of the energy of vortex shedding of the bridge wake flow and the reduction of the flutter amplitude are necessary preconditions for wind resistance design, and wind tunnel experiments and CFD numerical simulation of bridge section models are common research methods.
The control technology of the bridge wind vibration can be divided into active control and passive control according to the control type. Active control, i.e., active control, applies feedback from a set sensor to a driver to alter the force distribution at the bridge surface, stabilize the wake, and inhibit vortex shedding, according to the response of the flow system, by applying external energy. Passive control means passive control to change the geometry of the bluff body to influence the formation of vortex shedding. The passive control has great advantages in both economy and functionality, and is an ideal means for restraining the wind vibration of the bridge.
Disclosure of Invention
The invention aims to provide a passive control device for inhibiting wind vibration of a bridge, which greatly improves the wind resistance of the bridge on the premise of only changing the cross section shape of the bridge.
In order to achieve the purpose, the invention adopts the following technical scheme:
the symmetrical triangular air nozzles with the same length as the main span are arranged on the windward side of the bridge, and the air nozzles can be installed in multiple sections. The height of the tuyere is equal to the height of the bridge. The same size of air nozzle can be arranged on the leeward side, but the control effect of the air nozzle arranged on the windward side is better than that of the leeward side.
The section of the tuyere is isosceles triangle, and the angle alpha of the tuyere can be adjusted, generally about 40-115 degrees. Outside this range, the bridge stability can be negatively affected.
Compared with the prior control device, the invention has the following advantages:
no additional energy input is needed to reduce the energy loss. The tuyere has a simple appearance, is convenient to install and disassemble, and can be used for coping with different bridge appearances and wind directions and finding the most suitable tuyere angle. The design material of the tuyere is cheap, and the tuyere has good economic benefit. The drag reduction effect of the symmetrical air nozzles is good, and the air nozzles enable the whole bridge main body to be streamline. The air nozzle greatly reduces the separation bubbles of the boundary layer, reduces the lift coefficient of the bridge, and inhibits the vortex shedding at the rear edge of the bridge.
Drawings
FIG. 1 is a profile structure of a bridge with a tuyere installed at the front edge.
FIG. 2 is a cross-section of a bridge after the tuyere has been applied.
FIG. 3 shows the flow display result and the numerical simulation vorticity field obtained from the wind tunnel experiment when the simplified bridge model is not applied with the tuyere.
FIG. 4 shows a flow display result and a numerical simulation vorticity field obtained by a wind tunnel experiment after a tuyere is applied to the simplified bridge model.
FIG. 5 is a velocity power spectrum of the bridge model at 10 times the distance of the plate thickness at the trailing edge when no tuyere is applied.
FIG. 6 is a velocity power spectrum of a bridge simplified model after a tuyere is applied to the rear edge of the model by a distance of 10 times the plate thickness.
FIG. 7 is a diagram showing the ratio of the pulsating lift coefficient after and before the control is applied under different forced vibration amplitudes
Detailed Description
A further understanding of the performance and control effect of the control device may be realized by reference to the following illustrative description when read in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic view of a simplified bridge model with a tuyere, wherein the total length of the bridge model is 0.55m, the plate thickness is 0.02m, and the plate width is 0.1 m. The symmetrical air nozzles are arranged on one side of the model and are windward when a wind tunnel experiment is carried out. The bottom surface of the tuyere control part is superposed with the side surface of the model, and the sectional treatment is carried out, wherein the spanwise length of the tuyere is the length of the model and is 0.55 m. The width of the tuyere shown in the figure is equal to the plate thickness, is 0.02m, and the angle of the tuyere is 93 degrees and is an axisymmetrical tuyere. The improvement on the flow stability of the bridge model under the wind attack angle is very obvious. Fig. 2 is a cross-section of the bridge after the tuyere is applied.
In order to observe the vortex shedding condition of the rear edges of the front and rear rectangular plates under control, a wind tunnel experiment was performed. When a wind tunnel experiment is carried out, the incoming flow of the upstream inlet is set to be uniform flow with the wind speed of 1.4 m/s. The reflux type low-speed wind tunnel can provide fluid with the turbulence degree of about 5 percent, and the experimental Reynolds number is 1560. The segment model is transversely arranged at the horizontal center of the wind tunnel, and the side surface of the segment model is vertical to the incoming flow direction. In practical engineering application, when the width-thickness ratio of the cross section of the bridge is 5, namely the width-thickness ratio of the cross section of the experimental model is met, the bridge is prone to torsional flutter. Therefore, a single-degree-of-freedom torsional oscillation system is established, and the condition when torsional vibration response occurs is simulated. The amplitude response is set to 0-15 deg. and the oscillation frequency is 0-5 Hz. And obtaining a flow display image of the wake flow by a smoke line technology. The left graph of fig. 3 is the flow display result of the uncontrolled model, and the right graph is the corresponding numerical simulation result for verifying the correctness of the experimental result. It can be seen that at the trailing edge of the model, large scale vortices are shed alternately on the upper and lower sides of the sheet, progressing gradually as it moves downstream.
The left graph of fig. 4 shows the flow display results after control is applied, and the right graph shows the corresponding numerical simulation results. It can be seen that the scale of the alternately shed vortices is significantly reduced and that the shedding of vortices is significantly faster, resulting in an increased number of vortices shed in the same time. At the moment, the vibration frequency of the model is far away from the vortex shedding frequency, and the resonance phenomenon is not easily caused.
FIG. 5 is a velocity power spectrum of the uncontrolled model at a quiescent level. The abscissa corresponding to the illustrated main peak is the dimensionless vortex shedding frequency, i.e. the Steroha number, St 1 0.113. The corresponding ordinate, i.e. the main peak energy, was 76.2.
FIG. 6 is a velocity power spectrum of a model with a tuyere under the same condition. As shown, the strouha number St 2 0.177, main peak energy of 48.3. The vortex shedding frequency is obviously improved compared with an uncontrolled model, and the vortex energy is reduced. This contributes greatly to the suppression of resonance and vortex shedding.
Fig. 7 is a ratio of the pulsating lift coefficient after control is applied to the pulsating lift coefficient when torsional flutter occurs and when control is not applied to the pulsating lift coefficient under each working condition. The reduction of the pulsating lift coefficient can represent the improvement of the aerodynamic stability and vortex shedding inhibition effect of the bridge model. It can be seen that the pulsating lift coefficient is improved to different degrees in response to different amplitude frequencies. When the vibration frequency is lower or higher, the control effect is less ideal. When the dimensionless vibration frequency is within the range of 0.025-0.03, the pneumatic stability of the bridge model with torsional vibration is greatly improved by the air nozzle.
According to the experiment and the numerical simulation result, the tuyere can effectively inhibit the torsional vibration and increase the aerodynamic stability of the bridge.
Claims (2)
1. A passive control device for restraining wind vibration of a bridge is characterized in that the device is a triangular air nozzle, and the effect of the device is similar to that of a fairing. The air nozzle is arranged on the windward side of the bridge, and the air nozzle enables the cross section of the whole bridge to tend to be streamline. The angle of the tuyere is 93 degrees, and the control effect is achieved within the range of 40 degrees to 115 degrees. The control member is installed in segments and is easy to disassemble. The height of the tuyere is the same as the height of the cross section of the bridge.
2. The device for suppressing wind vibration of a bridge according to claim 1, wherein the control member is installed on the windward side of the bridge or on both the windward side and the leeward side of the bridge. The bottom surface of the tuyere coincides with the side surface of the bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210286868.7A CN114922049A (en) | 2022-03-22 | 2022-03-22 | Control device for restraining wind vibration of bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210286868.7A CN114922049A (en) | 2022-03-22 | 2022-03-22 | Control device for restraining wind vibration of bridge |
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| Publication Number | Publication Date |
|---|---|
| CN114922049A true CN114922049A (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210286868.7A Pending CN114922049A (en) | 2022-03-22 | 2022-03-22 | Control device for restraining wind vibration of bridge |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990046760A (en) * | 1999-04-22 | 1999-07-05 | 장승필 | A Passive Aerodynamics Control Apparatus for Bridge Flutter |
| DE102004053898A1 (en) * | 2004-11-09 | 2006-05-11 | Tutech Innovation Gmbh | Device for damping oscillatory motion in a building |
| CN102191747A (en) * | 2011-03-25 | 2011-09-21 | 中铁大桥勘测设计院有限公司 | Adaptive tuyere of steel box girder |
| CN104233945A (en) * | 2014-09-17 | 2014-12-24 | 上海大学 | Girder tuyere for controlling wind-induced vibration of cable bearing bridge |
| CN107503281A (en) * | 2017-07-13 | 2017-12-22 | 东北林业大学 | Loads of Long-span Bridges wind-induced vibration flow control method based on vortex generator |
| CN111101436A (en) * | 2020-01-14 | 2020-05-05 | 中铁二院工程集团有限责任公司 | Bridge wind barrier device and using method thereof |
| CN212895874U (en) * | 2020-07-09 | 2021-04-06 | 同济大学 | Wing-shaped air nozzle for controlling bridge vortex vibration |
| CN113026523A (en) * | 2021-03-29 | 2021-06-25 | 深圳大学 | Wind-resistant flow guide device for box girder bridge and implementation method thereof |
-
2022
- 2022-03-22 CN CN202210286868.7A patent/CN114922049A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990046760A (en) * | 1999-04-22 | 1999-07-05 | 장승필 | A Passive Aerodynamics Control Apparatus for Bridge Flutter |
| DE102004053898A1 (en) * | 2004-11-09 | 2006-05-11 | Tutech Innovation Gmbh | Device for damping oscillatory motion in a building |
| CN102191747A (en) * | 2011-03-25 | 2011-09-21 | 中铁大桥勘测设计院有限公司 | Adaptive tuyere of steel box girder |
| CN104233945A (en) * | 2014-09-17 | 2014-12-24 | 上海大学 | Girder tuyere for controlling wind-induced vibration of cable bearing bridge |
| CN107503281A (en) * | 2017-07-13 | 2017-12-22 | 东北林业大学 | Loads of Long-span Bridges wind-induced vibration flow control method based on vortex generator |
| CN111101436A (en) * | 2020-01-14 | 2020-05-05 | 中铁二院工程集团有限责任公司 | Bridge wind barrier device and using method thereof |
| CN212895874U (en) * | 2020-07-09 | 2021-04-06 | 同济大学 | Wing-shaped air nozzle for controlling bridge vortex vibration |
| CN113026523A (en) * | 2021-03-29 | 2021-06-25 | 深圳大学 | Wind-resistant flow guide device for box girder bridge and implementation method thereof |
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