Structure and method for improving wind vibration performance of long-span bridge

Abstract

The application provides a structure and method for improving wind vibration performance of a large-span bridge, and relates to the technical field of bridge engineering. The structure comprises a stand, a railing, a main active air blowing and sucking structure, an incoming flow monitoring device and a power control device. The incoming flow monitoring device is used for monitoring the wind speed and direction of the incoming flow. The power control device can control the active air sucking of the air sucking port and the active air blowing of the air blowing port of the main active air blowing and sucking structure. The method comprises monitoring the wind speed and direction of the incoming flow or the vibration response of the main beam. When the monitored wind speed of the incoming flow reaches the vortex vibration or flutter wind speed, or the monitored vibration response of the main beam reaches the vortex vibration or shows a flutter trend, the power control device is used to make the air sucking port on the windward side of the railing actively suck air and the air blowing port on the leeward side of the railing actively blow air. The application can adjust whether the main active air blowing and sucking structure blows or sucks air in real time according to the wind speed and direction of the incoming flow or the response of the main beam, and can effectively improve the wind-induced vibration stability of the bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a structure and method for improving the wind vibration performance of long-span bridges. Background Technology

[0002] Currently, the trend towards longer spans in bridges is growing. However, due to the characteristics of flexible structure, low damping, and light weight of the main girder of long-span bridges, the structural response amplitude under external loads is large, and they are highly sensitive to wind loads, resulting in wind-induced vibration problems that cannot be ignored. Flutter and vortex-induced vibration are the most representative of these problems. Flutter is a self-excited vibration that can diverge and has the potential to cause serious damage to the bridge structure. Vortex-induced vibration is a limited-amplitude vibration that, while not likely to cause serious accidents such as bridge collapse, often occurs at low wind speeds and can easily have an adverse impact on driving safety and comfort, and may even cause structural fatigue failure of the bridge. Therefore, the control of wind-induced vibration problems such as flutter and vortex-induced vibration needs to be given widespread attention.

[0003] Common wind-induced vibration control measures in engineering mainly include mechanical control measures and pneumatic control measures. Among them, mechanical control measures, such as the use of adjustable mass dampers (TMD), have the disadvantages of high cost and size limitation due to beam height, although they have good vibration reduction effect. Therefore, it is generally believed that under the same conditions, pneumatic control measures with more active vibration suppression mechanism should be given priority. Common pneumatic control measures include deflectors, deflectors, central stabilizing plates, central slots and vents. These pneumatic control measures are usually fixed on the bridge structure and can be called passive pneumatic control. They are widely used due to their low cost and strong robustness.

[0004] However, long-span bridges currently employing traditional passive aerodynamic measures still face the following technical challenges:

[0005] 1. The wind environment of long-span bridges is very complex. Once the traditional passive aerodynamic measures are determined by wind tunnel tests, their layout is difficult to adjust. Therefore, they can only work within a certain wind angle of attack and low wind speed range. When facing complex wind environments, their robustness and universality are weak, so their application is limited.

[0006] 2. Due to the sensitivity of the wind vibration performance of long-span bridge structures to their aerodynamic shape, a passive aerodynamic measure may improve one wind vibration performance while reducing other wind vibration performances.

[0007] 3. To meet the needs of normal use of long-span bridges, the arrangement of bridge ancillary facilities such as railings (including maintenance railings and crash barriers) will further blunt the shape of the bridge deck, thereby reducing the bridge's wind vibration performance (tests have shown that airflow separation and vortex shedding are serious phenomena at the railings).

[0008] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0009] In view of the above, the present invention provides a structure to improve the wind vibration performance of long-span bridges, aiming to solve the technical problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] In a first aspect, the present invention provides a structure for improving the wind-induced vibration performance of long-span bridges, which mainly includes:

[0012] Columns;

[0013] Railings, installed on posts; and

[0014] An active blowing and sucking structure includes an air inlet, an air outlet, an air inlet, an air inlet pipe, an air outlet pipe, an incoming flow monitoring device, and a power control device;

[0015] The air inlet and air inlet are connected to each other, and the air outlet and air outlet are connected to each other.

[0016] The incoming flow monitoring device is used to monitor the wind speed and direction of the incoming flow at the railing;

[0017] The power control device can control the air intake to actively draw in air and the air outlet to actively blow air based on the wind speed and direction determined by the incoming flow monitoring device, and can also adjust the magnitude of the blowing and suction force.

[0018] in:

[0019] The air intake and air outlet are respectively located on the windward and leeward sides of the railing;

[0020] The intake and exhaust pipes are not connected and are both located inside the railing.

[0021] In some embodiments of the present invention, multiple active blowing and sucking structures are distributed along the length of the railing.

[0022] In some embodiments of the present invention, multiple air intakes and air outlets are evenly distributed on the railing.

[0023] In some embodiments of the present invention, both the air intake pipe and the air blowing pipe are located inside the railing.

[0024] Secondly, the present invention provides a structure for improving the wind-induced vibration performance of long-span bridges, which mainly includes:

[0025] Columns;

[0026] Railings, installed on posts; and

[0027] The active air blowing and suction structure includes an air intake, an air blowing port, an air intake pipe, an air blowing pipe, a main beam vibration response monitoring device, and a power control device;

[0028] The air inlet and air inlet are connected to each other, and the air outlet and air outlet are connected to each other.

[0029] The main beam vibration response monitoring device is used to monitor the vibration response of the main beam.

[0030] The power control device can control the air intake to actively draw in air and the air blowing port to actively blow air based on the vibration response of the main beam monitored by the main beam vibration response monitoring device, and can also adjust the magnitude of the blowing and suction force.

[0031] in:

[0032] The air intake and air outlet are located on the windward and leeward sides of the railing;

[0033] The intake and exhaust pipes are not connected and are both located inside the railing.

[0034] In some embodiments of the present invention, multiple active blowing and sucking structures are distributed along the length of the railing.

[0035] In some embodiments of the present invention, multiple air intakes and air outlets are evenly distributed on the railing.

[0036] In some embodiments of the present invention, both the air intake pipe and the air blowing pipe are located inside the railing.

[0037] Thirdly, the present invention provides a method for improving the wind-induced vibration performance of long-span bridges, which mainly includes the following steps:

[0038] S1: Monitor the incoming wind speed and direction or monitor the vibration response of the main beam;

[0039] S2: When the monitored incoming wind speed reaches the vortex or flutter wind speed, the air intake on the windward side of the railing is actively drawn in and the air outlet on the leeward side of the railing is actively blown out through the power control device.

[0040] or,

[0041] When the monitored vibration response of the main beam reaches the level of vortex-induced vibration or shows a tendency to flutter, the air intake on the windward side of the railing is actively drawn in and the air outlet on the leeward side of the railing is actively blew out through the power control device.

[0042] In some embodiments of the present invention, the magnitude of the active air intake force at the air intake port and the active air blowing force at the air blowing port increases with the increase of the monitored incoming air velocity.

[0043] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0044] 1. The present invention adopts active pneumatic control measures, which can adjust whether the active blowing and suction structure blows or sucks in real time according to the incoming wind speed and direction; when the air inlet draws air and the air outlet blows air, it can form a three-dimensional spanwise disturbance at the railing, destroying the vortex shedding structure formed at that point during flutter or vortex-induced vibration, thereby effectively improving the stability of the bridge's wind-induced vibration.

[0045] 2. The present invention adopts active aerodynamic control measures, and the vibration suppression mechanism is more proactive and can adapt to vibration suppression tasks in various wind environments, and the control effect on wind-induced vibration of bridges is more significant.

[0046] 3. The openings (inlet and outlet) on the railings have the least impact on the aerodynamic shape of long-span bridges, thus making it less likely to suppress one vibration while amplifying another. Even if the active air intake structure is damaged or fails or there is a power outage, the stability of wind-induced vibration will not be affected by the change in the aerodynamic shape of the bridge caused by the structure itself.

[0047] 4. Compared with the active air blowing and suction method of drilling holes (inlet and outlet) in the main beam, drilling holes in the railing has the following advantages: the active air blowing and suction structure is easier to install, maintain, and replace, and has better feasibility; the active air blowing and suction structure can be flexibly arranged to follow the position of the railing, so as to achieve a better vibration damping effect; since airflow separation and vortex shedding are severe at the railing, the utilization rate of blowing and suction force is higher when destroying the vortex shedding structure formed during flutter or vortex vibration at this location; if holes are drilled in the main beam, the stress on the main beam structure will be greatly affected, while the railing does not have high requirements for stress performance, so drilling holes in the railing is more suitable.

[0048] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A structural schematic diagram of the main beam and the structure for improving the wind-induced vibration performance of long-span bridges;

[0051] Figure 2 A structural diagram of the railings and posts;

[0052] Figure 3 A schematic diagram of the structure of the air inlet, air outlet, air inlet pipe, and air outlet pipe;

[0053] Figure 4 This is a schematic diagram of the incoming flow monitoring device and power control device provided in Example 1;

[0054] Figure 5 This is a schematic diagram of the main beam vibration response monitoring device and power control device provided in Example 2.

[0055] icon:

[0056] 1-Column,

[0057] 2-Fence, 21-Windward side, 22-Leafward side

[0058] 31-Intake port, 32-Outtake port, 33-Intake pipe, 34-Outtake pipe, 351-Incoming flow monitoring device, 352-Main beam vibration response monitoring device, 36-Power control device

[0059] 4-Main beam. Detailed Implementation

[0060] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention.

[0061] In the description of the embodiments of the present invention, it should be understood that the terms "length", "upper", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

[0062] Furthermore, the term "multiple" means two or more, unless otherwise explicitly specified.

[0063] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0064] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0065] Example 1

[0066] Please refer to Figures 1-4 , Figure 4 The direction indicated by the middle arrow is the airflow direction; in the first aspect, this embodiment provides a structure to improve the wind vibration performance of long-span bridges, which mainly includes: column 1, railing 2 and active blowing and suction structure.

[0067] The railing 2 and the column 1 are auxiliary facilities of the long-span bridge. The railing 2 is installed on the column 1, and the column 1 is installed on the upper edge of the main beam 4.

[0068] The active air blowing and suction structure can mainly include an air intake 31, an air blowing 32, an air intake pipe 33, an air blowing pipe 34, an incoming flow monitoring device 351, and a power control device 36. Multiple active air blowing and suction structures can be distributed along the length of the railing 2. In other words, the main beam 4 can be divided into multiple bridge segments along the length of the main beam 4, and an active air blowing and suction structure can be set on the railing 2 of each bridge segment, so that each active air blowing and suction structure can work independently or cooperate with each other, thereby improving the vibration suppression effect.

[0069] The air intake 31 and the air intake pipe 33 are interconnected, and the air blowing port 32 and the air blowing pipe 34 are interconnected. The air intake 31 and the air blowing port 32 are respectively located on the windward side 21 and the leeward side 22 of the railing 2, and multiple air intake ports 31 and air blowing ports 32 are evenly distributed on the railing 2. The air intake pipe 33 and the air blowing pipe 34 are not interconnected and function independently. In a specific implementation scenario, both the air intake pipe 33 and the air blowing pipe 34 are located inside the railing 2. That is to say, the railing 2 itself is used as a pipe, and the active air blowing and suction structure does not need to be configured with additional pipes for the air intake pipe 33 and the air blowing pipe 34. When additional pipes are configured, in order to minimize the impact on the aerodynamic shape of the long-span bridge, the additional pipes need to be hidden. Although this is not difficult to achieve, it is relatively more troublesome.

[0070] The incoming flow monitoring device 351 is used to monitor the wind speed and direction of the incoming flow at two points on the railing in real time.

[0071] The power control device 36 can control the air intake 31 to actively draw in air and the air outlet 32 ​​to actively blow air according to the wind speed and wind direction determined by the incoming flow monitoring device 351, and can adjust the magnitude of the blowing and suction force.

[0072] This embodiment employs active aerodynamic control measures. Specifically, when there is wind, the active blowing and suction structure can be adjusted in real time according to the wind speed and direction of the incoming flow to determine whether to blow or suction and the magnitude of the blowing and suction force. When the air intake 31 draws in air and the air outlet 32 ​​blows air, a three-dimensional spanwise (length direction of the railing 2) disturbance can be formed at the railing 2, which can destroy the vortex shedding structure formed at this location during flutter or vortex-induced vibration, thereby effectively improving the stability of the bridge's wind-induced vibration. When there is no wind, the air intake 31 and the air outlet 32 ​​do not work and do not affect the aerodynamic performance of long-span bridges.

[0073] It is understandable that after the air intake 31 and air outlet 32 ​​are opened, their positions on the railing 2 remain unchanged. The windward side 21 and leeward side 22 of the railing 2 are two relative concepts because the wind direction is constantly changing. When the wind direction changes, the windward side 21 and leeward side 22 of the railing 2 may also change. Therefore, the windward side 21 and leeward side 22 of the railing 2 do not refer to two fixed sides of the railing 2. Similarly, the air intake 31 and air outlet 32 ​​are also two relative concepts. That is to say, when one side of the railing 2 is windward, that side is the windward side 21, and the hole on the windward side 21 is the air intake 31. The other side of the railing 2 is the leeward side 22, and the hole on the leeward side 22 is the air outlet 32.

[0074] Secondly, this embodiment provides a method for improving the wind-induced vibration performance of long-span bridges, which utilizes the structure provided in this embodiment for improving the wind-induced vibration performance of long-span bridges. This method mainly includes the following steps:

[0075] S1: Monitor the incoming wind speed and direction or monitor the vibration response of the main beam 4 using the incoming flow monitoring device 351;

[0076] S2: When the monitored incoming wind speed reaches the vortex or flutter wind speed, the power control device 36 causes the air intake 31 on the windward side 21 of the railing 2 to actively draw in air and the air outlet 32 ​​on the leeward side 22 of the railing 2 to actively blow air. The magnitude of the active air intake 31 and the active air blowing 32 can increase as the monitored incoming wind speed increases.

[0077] Example 2

[0078] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 Firstly, this embodiment provides a structure for improving the wind vibration performance of long-span bridges, which mainly includes: a column 1, a railing 2, and an active air blowing and suction structure.

[0079] The railing 2 and the column 1 are auxiliary facilities of the long-span bridge. The railing 2 is installed on the column 1, and the column 1 is installed on the upper edge of the main beam 4.

[0080] The active air blowing and suction structure can mainly include an air intake 31, an air blowing 32, an air intake pipe 33, an air blowing pipe 34, an incoming flow monitoring device 351, and a power control device 36. Multiple active air blowing and suction structures can be distributed along the length of the railing 2. In other words, the main beam 4 can be divided into multiple bridge segments along the length of the main beam 4, and an active air blowing and suction structure can be set on the railing 2 of each bridge segment, so that each active air blowing and suction structure can work independently or cooperate with each other, thereby improving the vibration suppression effect.

[0081] The air intake 31 and the air intake pipe 33 are interconnected, and the air blowing port 32 and the air blowing pipe 34 are interconnected. The air intake 31 and the air blowing port 32 are respectively located on the windward side 21 and the leeward side 22 of the railing 2, and multiple air intake ports 31 and air blowing ports 32 are evenly distributed on the railing 2. The air intake pipe 33 and the air blowing pipe 34 are not interconnected and function independently. In a specific implementation scenario, both the air intake pipe 33 and the air blowing pipe 34 are located inside the railing 2. That is to say, the railing 2 itself is used as a pipe, and the active air blowing and suction structure does not need to be configured with additional pipes for the air intake pipe 33 and the air blowing pipe 34. When additional pipes are configured, in order to minimize the impact on the aerodynamic shape of the long-span bridge, the additional pipes need to be hidden. Although this is not difficult to achieve, it is relatively more troublesome.

[0082] The main beam vibration response monitoring device 352 is used to monitor the vibration response of the main beam 4 in real time.

[0083] The power control device 36 can control the air intake 31 to actively intake air and the air blowing port 32 to actively blow air according to the vibration response of the main beam 4 monitored by the main beam vibration response monitoring device 352, and can adjust the magnitude of the blowing and suction force.

[0084] This embodiment adopts active pneumatic control measures. Specifically, the active air blowing and suction structure can be adjusted in real time according to the vibration response of the main beam 4 to determine whether to blow or suck air and the magnitude of the blowing and suction force. When the air intake 31 sucks air and the air blowing 32 blows air, a three-dimensional spanwise (length direction of the railing 2) disturbance can be formed at the railing 2, which can destroy the vortex shedding structure formed at this location during flutter or vortex vibration, thereby effectively improving the stability of the bridge's wind-induced vibration.

[0085] It is understandable that after the air intake 31 and air outlet 32 ​​are opened, their positions on the railing 2 remain unchanged. The windward side 21 and leeward side 22 of the railing 2 are two relative concepts because the wind direction is constantly changing. When the wind direction changes, the windward side 21 and leeward side 22 of the railing 2 may also change. Therefore, the windward side 21 and leeward side 22 of the railing 2 do not refer to two fixed sides of the railing 2. Similarly, the air intake 31 and air outlet 32 ​​are also two relative concepts. That is to say, when one side of the railing 2 is windward, that side is the windward side 21, and the hole on the windward side 21 is the air intake 31. The other side of the railing 2 is the leeward side 22, and the hole on the leeward side 22 is the air outlet 32.

[0086] Secondly, this embodiment provides a method for improving the wind-induced vibration performance of long-span bridges, which utilizes the structure provided in this embodiment for improving the wind-induced vibration performance of long-span bridges. This method mainly includes the following steps:

[0087] S1: Monitor the incoming wind speed and direction or monitor the vibration response of the main beam 4 using the main beam vibration response monitoring device 352;

[0088] S2: When the vibration response of the main beam 4 monitored reaches the level of vortex vibration or shows a tendency to flutter, the air intake 31 on the windward side 21 of the railing 2 actively draws in air and the air outlet 32 ​​on the leeward side 22 of the railing 2 actively blows air through the power control device 36.

[0089] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure for improving the wind-induced vibration performance of long-span bridges, characterized in that, include: Columns; The railing is installed on the posts; and An active blowing and sucking structure includes an air inlet, an air outlet, an air inlet, an air inlet pipe, an air outlet pipe, an incoming flow monitoring device, and a power control device; The air inlet and the air inlet pipe are connected to each other, and the air outlet and the air inlet pipe are connected to each other. The incoming flow monitoring device is used to monitor the wind speed and direction of the incoming flow at the railing; The power control device can control the air inlet to actively inhale and the air outlet to actively blow air according to the wind speed and direction determined by the incoming flow monitoring device, and can adjust the magnitude of the blowing and suction force. in: Multiple active air blowing and suction structures are distributed along the length of the railing; The air intake and the air outlet are respectively located on the windward and leeward sides of the railing; Both the air intake pipe and the air blowing pipe are located inside the railing, and the air intake pipe and the air blowing pipe are not connected.

2. The structure for improving the wind vibration performance of long-span bridges according to claim 1, characterized in that, The multiple air intakes and air outlets are evenly distributed on the railing.

3. A structure for improving the wind-induced vibration performance of long-span bridges, characterized in that, include: Columns; The railing is installed on the posts; and The active air blowing and suction structure includes an air intake, an air blowing port, an air intake pipe, an air blowing pipe, a main beam vibration response monitoring device, and a power control device; The air inlet and the air inlet pipe are connected to each other, and the air outlet and the air inlet pipe are connected to each other. The main beam vibration response monitoring device is used to monitor the vibration response of the main beam. The power control device can control the air intake to actively draw in air and the air blowing port to actively blow air based on the main beam vibration response monitored by the main beam vibration response monitoring device, and can also adjust the magnitude of the blowing and suction force. in: Multiple active air blowing and suction structures are distributed along the length of the railing; The air intake and the air outlet are distributed on the windward and leeward sides of the railing; The air intake pipe and the air blowing pipe are not connected and are both located inside the railing.

4. The structure for improving the wind vibration performance of long-span bridges according to claim 3, characterized in that, The multiple air intakes and air outlets are evenly distributed on the railing.

5. A method for improving the wind-induced vibration performance of long-span bridges, characterized in that, Using the structure for improving the wind-induced vibration performance of long-span bridges as described in any one of claims 1-4, the method includes the following steps: S1: Monitor the incoming wind speed and direction or monitor the vibration response of the main beam; S2: When the monitored incoming wind speed reaches the vortex or flutter wind speed, the air intake on the windward side of the railing is actively drawn in and the air outlet on the leeward side of the railing is actively blown out through the power control device. or, When the monitored vibration response of the main beam reaches the level of vortex-induced vibration or shows a tendency to flutter, the air intake on the windward side of the railing is actively drawn in and the air outlet on the leeward side of the railing is actively blew out through the power control device.

6. The method for improving the wind-induced vibration performance of long-span bridges according to claim 5, characterized in that, The magnitude of the active air intake force at the air intake port and the active air blowing force at the air blowing port increases with the increase of the monitored incoming air velocity.

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