Blowing steady device for inhibiting vortex-induced vibration of double-split steel box girder and use method thereof

Abstract

The application provides a blowing steady device for inhibiting vortex-induced vibration of a double-split steel box girder. Compared with an original guide plate, the disturbance guide plate can determine a possible formation position of periodic vortex shedding according to characteristics of a flow wind and a state of the bridge. By rotating a gas guide pipe, the jet flow disturbs the periodic vortex shedding, thereby improving and inhibiting the vortex-induced vibration problem of the main girder. In addition, by rotating the gas guide pipe, the jet flow can be directed to the flow direction, thereby preventing the generation of the periodic vortex shedding from the root. By arranging multiple exhaust ports, the jet flow outlet angle of the gas guide pipe is wide, the jet flow is output in multiple directions, and the vortex-induced vibration of the main girder is more accurately and effectively inhibited. The disturbance guide plate has a simple structure and does not have a precise and complex mechanical structure, and is easy to control. The gas guide pipe can be made of light material, and the motor has small output power.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wind-induced vibration control of large-span bridges, in particular to a blowing steady-state device for inhibiting vortex-induced vibration of a double-split steel box girder and a use method thereof. BACKGROUND

[0002] In the prior art, with the rapid development of society and economy and the use of light-weight high-strength materials, the span of bridges is increasing day by day, the structural fundamental frequency is getting lower and lower, the mass is getting lighter and lighter, and the damping ratio is smaller, so the influence of wind on large-span bridges is more and more obvious. If the vortex-induced vibration problem is not effectively solved, great difficulties will be caused to the design and operation of the bridge. Therefore, the wind-induced vibration problem of the large-span bridge needs to be effectively solved to improve the safety reserve of the bridge.

[0003] Aerodynamic measures and damping measures are two main methods for inhibiting wind-induced vibration of a main girder. The damping measures improve the equivalent damping of a structural system by installing dampers such as TMD, AT-MD and AMD to reduce the vortex vibration amplitude. The aerodynamic measures reduce wind-induced vibration by optimizing the aerodynamic shape of the structure, and the main aerodynamic measures include a wind nozzle, a fairing, a stabilizing plate, a guide vane, a flow suppression plate, a grille, a windbreak, a skirt plate and a maintenance track. The aerodynamic measures are widely used because of their strong robustness and low cost and maintenance cost. However, the aerodynamic measures have poor self-adaptive ability, and with the increase of the span of the bridge, the control effect of the aerodynamic measures on the vortex-induced vibration is increasingly unsatisfactory.

[0004] To improve the shortcomings of passive measures, the application provides a blowing steady-state device for inhibiting vortex-induced vibration of a double-split steel box girder and a use method thereof. SUMMARY

[0005] The application provides a blowing steady-state device for inhibiting vortex-induced vibration of a double-split steel box girder, which improves the self-adaptive ability of the aerodynamic measures, adjusts the intensity of the jet flow, and thereby disturbs the vortex shedding of the bridge to solve the vortex vibration problem.

[0006] The blowing steady-state device for inhibiting vortex-induced vibration of a double-split steel box girder comprises two box girders and two cross beams connected between the two box girders, and a guide vane arranged between the two cross beams. The guide vane is hollow and forms a cavity. A plurality of exhaust ports are arranged on the side of the guide vane and are connected with the cavity. A gas guide assembly is arranged in the cavity and can release gas to the exhaust ports in different directions. When the double-split box girder produces vortex-induced vibration, the gas guide assembly can release gas to the exhaust ports in different directions by rotating to inhibit vortex-induced vibration.

[0007] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, the air guide assembly comprises:

[0008] An air guide pipe is rotatably arranged in the cavity, and an air outlet is arranged on the air guide pipe;

[0009] An air generator is arranged in the box girder and communicates with the air guide pipe, and is used for generating air;

[0010] A transmission mechanism is arranged in the guide vane, and can drive the air guide pipe to rotate, so that the air outlet on the air guide pipe releases air to the air outlets in different directions.

[0011] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, a plurality of air outlets distributed around the guide vane in different directions are a group, and a plurality of groups are arranged along the length direction of the guide vane, and a plurality of air outlets are arranged along the length direction of the air guide pipe and correspond to the plurality of groups of air outlets.

[0012] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, each group of air outlets is provided with 8 air outlets, and the 8 air outlets are in radial communication with the outside from the cavity.

[0013] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, the transmission mechanism comprises a transmission shaft, a transmission belt in transmission connection with the transmission shaft and the air guide pipe, and a driving motor arranged in the guide vane and used for driving the transmission shaft to rotate to drive the air guide pipe to rotate.

[0014] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, a plurality of transmission mechanisms are arranged along the length direction of the guide vane.

[0015] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, two box girders are provided with displacement sensors for detecting displacement information at the ends away from the guide vane.

[0016] The air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, the transverse beam further comprises an information processor for obtaining the displacement information of the displacement sensor, and the information processor controls the air guide assembly to release air flow according to the obtained displacement information.

[0017] A use method of the air blowing steady device for inhibiting vortex-induced vibration of the double split steel box girder as described above, comprising the following steps:

[0018] S1, judging whether the split box girder generates vortex-induced vibration;

[0019] S2, when judging that the box girder generates vortex-induced vibration, the air guide assembly can release gas to the exhaust port by rotating to suppress vortex-induced vibration;

[0020] S3, judging whether the vortex-induced vibration of the box girder is improved, if it is suppressed, the control of the split box girder section bridge is completed, if it is not suppressed, continue to send signals to the air guide assembly, the air guide assembly continues to increase the amount of released gas to the exhaust port to suppress vortex-induced vibration, and the process is repeated until the vortex-induced vibration of the double split steel box girder is suppressed, and then the work is stopped.

[0021] The use method of the air blowing steady-state device for suppressing vortex-induced vibration of a double split steel box girder as described above, step S1 specifically comprises:

[0022] Step S101: Real-time monitoring of vortex vibration at different positions of the split box girder;

[0023] Step S102: judging whether the real-time amplitude exceeds the vortex vibration limit value of the bridge.

[0024] Compared with the prior art, the application has the following beneficial effects:

[0025] 1. The application provides an air blowing steady-state device for suppressing vortex-induced vibration of a double split steel box girder. Compared with the existing original fairing, the spoiler fairing can judge where periodic vortex shedding is likely to occur according to the characteristics of the incoming flow and the state of the bridge. By rotating the air guide pipe, the jet flow can disturb the periodic vortex shedding, thereby improving and suppressing the vortex-induced vibration problem of the main girder. In addition, by rotating the air guide pipe, the jet flow can be directed in the incoming flow direction to prevent the generation of periodic vortex shedding from the source. By providing multiple exhaust ports, the jet flow outlet angle of the air guide pipe is wide, and the jet flow is output in multiple directions, which is more accurate and effective in suppressing the vortex-induced vibration of the main girder. The spoiler fairing structure is simple and does not have precise and complex mechanical structures, and is easy to control. The fairing pipe can be made of lightweight materials, and the motor output power is small.

[0026] 2. The application provides a use method of an air blowing device for suppressing vortex-induced vibration of a double split steel box girder. The operation is simple and the degree of automation is high. Whether the box girder generates vortex-induced vibration can be judged by the displacement sensor arranged at both ends of the box girder, and information is transmitted to the information processor. After processing by the information processor, it is determined whether the anti-vibration assembly and the air guide assembly work. If it is suppressed, the control of the split box girder section bridge is completed. If it is not suppressed, continue to send signals to the air guide assembly, the air guide assembly continues to increase the amount of released gas to the exhaust port to suppress vortex-induced vibration, and the jet flow power of the air guide assembly is adjusted according to the size of the vortex-induced vibration, and the size of the wind speed is adjusted, which is convenient for control. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the technical solutions in the embodiments of the present application clearer, the accompanying drawings needed in the embodiment description will be briefly introduced.

[0028] Figure 1 is a perspective view of the blowing steady-state device for suppressing vortex-induced vibration of a double-split steel box girder of the present application and a hidden internal view of the cross beam;

[0029] Figure 2 is an enlarged perspective view of position A of the blowing steady-state device for suppressing vortex-induced vibration of a double-split steel box girder of the present application;

[0030] Figure 3 is an exploded view of the anti-vibration assembly and the gas guide assembly of the blowing steady-state device for suppressing vortex-induced vibration of a double-split steel box girder of the present application;

[0031] Figure 4 is a sectional view of the cavity of the blowing steady-state device for suppressing vortex-induced vibration of a double-split steel box girder of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described below in combination with the accompanying drawings:

[0033] As shown in Figures 1-4 , a blowing device for suppressing vortex-induced vibration of a double-split steel box girder, comprising a box girder 1, a cross beam 10, an anti-vibration assembly 2, a cavity 20, exhaust ports 201, a gas guide assembly 3, a gas guide pipe 30, a gas generator 31, gas outlets 32, a displacement sensor 4, and an information processor 5.

[0034] The blowing steady-state device for suppressing vortex-induced vibration of a double-split steel box girder, the split box girder comprising two box girders 1 and two cross beams 10 connected between the two box girders 1, the blowing steady-state device comprising a flow guide plate 2 arranged between the two cross beams 10, the flow guide plate 2 being hollow inside and forming a cavity 20, the flow guide plate 2 being provided with a plurality of exhaust ports 201 on the side thereof, the exhaust ports 201 being directed in different directions and being in communication with the cavity 20, the cavity 20 being provided with a gas guide assembly 3 that can release gas to the exhaust ports 201 in different directions, when the split box girder generates vortex-induced vibration, the gas guide assembly 3 can release gas to the exhaust ports 201 in different directions by rotating to suppress vortex-induced vibration, by arranging the gas guide assembly that can rotate in the anti-vibration assembly, compared with the prior art, the spoiler flow guide plate can determine where periodic vortex shedding is likely to occur according to the characteristics of the incoming flow and the state of the bridge, by rotating the gas guide pipe, the jet flow can disturb the periodic vortex shedding, thereby improving and suppressing the problem of vortex-induced vibration of the main girder, secondly, by rotating the gas guide assembly, the jet flow can be directed to the incoming flow direction to prevent the generation of periodic vortex shedding from the source.

[0035] Preferably, the gas guide assembly 3 comprises:

[0036] A gas guide pipe 30 is rotatably arranged in the cavity 20, and a gas outlet hole 32 is arranged on the gas guide pipe 30;

[0037] A gas generator 31 is arranged in the box girder 1 and communicates with the gas guide pipe 30, and is used for generating gas.

[0038] A transmission mechanism 21 is arranged in the guide plate 2 and can drive the gas guide pipe 30 to rotate, so that the gas outlet hole 32 on the gas guide pipe 30 releases gas to the different directions of the exhaust port 201. By arranging the gas generator for generating gas and the gas guide pipe, the gas guide pipe can rotate inside the cavity to suppress vortex-induced vibration of the jet flow in different directions. By arranging the transmission mechanism, the rotation of the gas guide pipe is more automatic and does not need manual operation. Moreover, the jet direction of the gas guide pipe can be controlled by the information processor, and the transmission mode is more stable.

[0039] Preferably, a plurality of exhaust ports 201 distributed around the guide plate 2 in different directions form a group, and a plurality of groups are arranged along the length direction of the guide plate 2. A plurality of gas outlet holes 32 are arranged along the length direction of the gas guide pipe 30 and correspond to the plurality of groups of exhaust ports 201. By arranging a plurality of exhaust ports, the jet outlet angle of the gas guide pipe is wide, and the jet flow is output in multiple directions, which is more accurate and effective in suppressing vortex-induced vibration of the main girder. The spoiler guide plate has a simple structure and is easy to control. The guide pipe can be made of lightweight materials, and the motor has small output power.

[0040] Preferably, each group of exhaust ports 201 has 8 exhaust ports 201, and the 8 exhaust ports 201 are in communication with the outside in a radial manner from the cavity 20. The exhaust ports can be arranged in eight directions uniformly distributed around the anti-vibration assembly. The jet outlet angle of the gas guide pipe is wide, and the jet flow is output in multiple directions, which is more accurate and effective in suppressing vortex-induced vibration of the main girder. The gas guide pipe can be made of lightweight materials to reduce the connection burden of the gas generator to the gas guide pipe.

[0041] Preferably, the transmission mechanism 21 includes a transmission shaft 211, a transmission belt 212 in transmission connection with the transmission shaft 211 and the gas guide pipe 30, and a drive motor arranged in the guide plate 2 and used for driving the transmission shaft 211 to rotate to drive the gas guide pipe 30 to rotate.

[0042] Preferably, a plurality of transmission mechanisms 21 are arranged along the length direction of the guide plate 2.

[0043] Preferably, two box girders 1 away from one end of the guide plate 2 are each provided with a displacement sensor 4 for detecting displacement information.

[0044] Preferably, the crossbeam 10 is also provided with an information processor 5 for obtaining displacement information of the displacement sensor 4, and the information processor 5 controls the air release of the air guide assembly 3 according to the obtained displacement information.

[0045] A method for using the air blowing steady device for suppressing vortex-induced vibration of a double split steel box girder according to any one of claims 1-8, comprising the following steps:

[0046] S1, judging whether the split box girder produces vortex-induced vibration;

[0047] S2, when it is judged that the box girder 1 produces vortex-induced vibration, the air guide assembly 3 can release air to the air outlet 201 by rotating to suppress vortex-induced vibration, the data processor controls the input power of the air blower, starts to record data as 0, records data as 0-7, the output power is low power, when the recorded data is 8-15, the output power is medium power, when the recorded data is 15 or more, the output power is high power, the transmission device controls the rotation of the air guide pipe to change the blowing direction, and records data +1;

[0048] S3, judging whether the vortex-induced vibration of the box girder 1 is improved, if it is suppressed, the split box girder cross-section bridge control is completed, if it is not suppressed, continue to send signals to the air guide assembly 3, the air guide assembly 3 continues to increase the amount of air released to the air outlet 201 to suppress vortex-induced vibration, and the process is repeated until the vortex-induced vibration of the double split steel box girder is suppressed, and then the work is stopped.

[0049] Preferably, step S1 specifically comprises:

[0050] Step S101: real-time monitoring of vortex vibration at different positions of the split box girder;

[0051] Step S102: judging whether the real-time amplitude exceeds the vortex vibration limit value of the bridge.

[0052] More preferably, according to article 8.2.9 of “Highway Bridge Wind Resistance Design Specification” (JTG / T 3360-01-2018): when the span is less than 200m, the vortex-induced resonance of the bridge in the W1 wind action level and below the wind speed range can be tested according to the formula (8.2.9-1) and formula (8.2.9-2) given in the specification. According to article 8.2.9 of the wind resistance specification.

[0053] Allowable vertical displacement peak value:

[0054] Allowable torsional angle peak value:

[0055] Allowable vertical displacement root mean square:

[0056] Allowable peak value of vertical displacement:

[0057] When the bridge span is greater than 200m, the vortex-induced resonance amplitude is mainly considered from the perspective of pedestrian comfort. According to article 8.5.1 of the “Code for Design of Wind-resistant Highway Bridges” (JTG / T 3360-01-2018), the peak value of vertical acceleration caused by buffeting and vortex-induced resonance of bridges with pedestrian access function should not exceed 1.1m / s2, and the peak value of lateral acceleration should not exceed 0.5m / s2. According to this provision, the allowable peak values of vertical bending vortex vibration and torsional vortex vibration of the main girder are derived as follows:

[0058] Allowable peak value of vertical displacement: h 2 (m)

[0059] Allowable peak value of torsional angle:

[0060] Allowable peak value of vertical displacement: RMS = 0.0197 / f h 2 (m)

[0061] Allowable peak value of torsional angle:

[0062] In the formula, fh is the vertical modal frequency, ft is the torsional modal frequency, and B is the width of the bridge sidewalk.

[0063] According to article 3.2.2 of the “Code for Design of Wind-resistant Highway Bridges” (JTG / T 3360-01-2018), the wind-resistant design of bridges is determined according to W1 wind action level and W2 wind action level, and the corresponding wind speed values and design standards should meet the provisions of Table 3.2.2. According to this provision, the vortex vibration design target requirements are as shown in the table.

[0064]

[0065] Therefore, when the main girder is in a windless environment or the wind speed has little effect on the main girder, the blowing steady-state device for suppressing vortex-induced vibration of the double-part steel box girder does not work, does not require additional power input, and the shape of the anti-vibration assembly 2 can provide a better aerodynamic effect for the bridge.

[0066] When the wind environment causes the main beam to produce vortex-induced vibration, the place where the periodic vortex is likely to form is judged according to the state of the incoming flow wind, and the air outlet hole 32 in the air guide assembly 3 is aligned with a directional hole position on the air outlet 201 on the anti-vibration assembly 2 through the rotating device, and the input energy of the air blower is judged according to the vibration condition of the main beam. After the judgment, the gas generator generates airflow, which is blown into the hollow air guide pipe 30, and the gas enters the air guide pipe 30. Because the air outlet hole 32 has been aligned with a directional hole position on the air outlet 201 on the anti-vibration assembly 2 through the transmission mechanism 21, the gas is sprayed out from here to form a jet, change the gas flow field around the main beam, and disturb the formation of periodic vortex shedding, so as to suppress the bridge vortex-induced vibration.

[0067] Therefore, the application provides a kind of blowing gas steady device for inhibiting double split type steel box girder vortex-induced vibration and its use method, relative to prior art, spoiler fairing can be according to the characteristics of the incoming flow wind and the state of bridge to judge the place where periodic vortex shedding is likely to form, by rotating air guide pipe, jet is disturbed periodic vortex shedding, to improve and inhibit the problem of main beam vortex-induced vibration, second, can be by rotating air guide pipe, the direction of incoming flow is jet, prevents the generation of periodic vortex shedding from the root; By setting multiple air outlets, the jet outlet angle of air guide pipe is wide, and jet is output to multiple directions, which is more accurate and effective for inhibiting main beam vortex-induced vibration; Spoiler fairing structure is simple, without precise and complex mechanical structure, and easy to control; Air guide pipe can be made of light material, and motor output power is small.

[0068] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An air-blowing steady-state device for suppressing vortex-induced vibration of a double-splitter steel box girder, wherein the split box girder comprises two box girders (1) and two crossbeams (10) connecting the two box girders (1), characterized in that: The air blowing steady device comprises a guide plate (2) arranged between the two beams (10), the guide plate (2) is hollow inside and forms a cavity (20), the guide plate (2) is provided with a plurality of exhaust ports (201) in different directions and communicated with the cavity (20), the cavity (20) is provided with a guide assembly (3) capable of releasing gas to the exhaust ports (201) in different directions, when the split box girder produces vortex-induced vibration, the guide assembly (3) can release gas to the exhaust ports (201) in different directions by rotating to suppress vortex-induced vibration.

2. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 1, characterized in that: The guide assembly (3) comprises: A guide pipe (30) is rotatably arranged in the cavity (20), and an air outlet hole (32) is arranged on the guide pipe (30); A gas generator (31) is arranged in the box girder (1) and communicated with the guide pipe (30) for generating gas; A transmission mechanism (21) is arranged in the guide plate (2) and can drive the guide pipe (30) to rotate, so that the air outlet hole (32) on the guide pipe (30) releases gas to the exhaust ports (201) in different directions.

3. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 2, characterized in that: A plurality of exhaust ports (201) distributed in different directions on the periphery of the guide plate (2) are a group, and a plurality of groups are arranged along the length direction of the guide plate (2), the air outlet hole (32) is arranged along the length direction of the guide pipe (30) and corresponds to a plurality of groups of the exhaust ports (201).

4. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 2, characterized in that: Each group of the exhaust ports (201) is provided with 8 exhaust ports (201), and the 8 exhaust ports (201) are in radial communication with the outside from the cavity (20).

5. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 2, characterized in that: The transmission mechanism (21) comprises a transmission shaft (211), a transmission belt (212) in transmission connection with the transmission shaft (211) and the guide pipe (30), and a driving motor arranged in the guide plate (2) for driving the transmission shaft (211) to rotate to drive the guide pipe (30) to rotate.

6. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 5, characterized in that: The transmission mechanism (21) is arranged in a plurality of groups along the length direction of the guide plate (2).

7. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 1, characterized in that: The two box girders (1) are provided with displacement sensors (4) for detecting displacement information at one end away from the guide plate (2).

8. The steady blowing device for suppressing vortex-induced vibration of a double-section steel box girder according to claim 7, characterized in that: The beam (10) is further provided with an information processor (5) for acquiring the displacement information of the displacement sensor (4), and the information processor (5) controls the guide assembly (3) to release gas flow according to the acquired displacement information.

9. A method of using the steady blowing device for suppressing vortex-induced vibration of a bifurcated steel box girder according to any one of claims 1-8, characterized in that, The method comprises the following steps: S1, judging whether the split box girder produces vortex-induced vibration; S2, when it is judged that the box girder (1) produces vortex-induced vibration, the guide assembly (3) can release gas to the exhaust ports (201) by rotating to suppress vortex-induced vibration; S3, judging whether the vortex-induced vibration of the box girder (1) is improved, if it is suppressed, the split box girder cross-section bridge control is completed, if it is not suppressed, continue to send signals to the guide assembly (3), the guide assembly (3) continues to increase the amount of released gas to the exhaust ports (201) to suppress vortex-induced vibration, and the process is repeated until the vortex-induced vibration of the double split steel box girder is suppressed, and then the work is stopped.

10. The method of claim 9, wherein the method further comprises: adjusting the angle of the jetting nozzle to the angle of attack of the vortex shedding. Step S1 specifically comprises: Step S101: Real-time monitoring of vortex vibration of different positions of the split box girder; Step S102: Determine whether the real-time amplitude exceeds the vortex vibration limit value of the bridge.

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