A bridge with improved vortex vibration and flutter stability of main beam

Abstract

The present invention belongs to the technical field of bridges, and specifically provides a bridge that improves the vortex vibration and flutter stability of the main beam, including a main beam, and a plurality of railing assemblies arranged on the main beam, the railing assembly including a mounting plate, a rotation drive unit and a railing unit, the mounting plate and the main beam are rotationally coordinated, the rotation drive unit is transmission-connected to the mounting plate, and the inclination angle and inclination direction of the railing assembly can be adjusted. A plurality of railing units are provided on the mounting plate, and the railing unit includes two relatively arranged fixed columns and a plurality of cross bars, and the plurality of cross bars can be movably arranged up and down on the fixed columns, and the height of the railing assembly can be changed. The present invention provides the main beam with a variety of achievable aerodynamic shapes by providing a rotatable railing assembly and a liftable cross bar, and can flexibly change the aerodynamic shape of the main beam to meet the stability requirements of the main beam against vortex vibration and flutter in different wind environments, and solves the problem that existing bridges lack reliable response measures when facing complex wind environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridges, and in particular relates to a bridge capable of improving the vortex vibration and flutter stability of a main beam. Background Art

[0002] Vortex vibration and flutter are two types of vibration that can occur on bridges under the influence of wind. Vortex vibration is a self-excited, forced vibration that is particularly prone to occur at low wind speeds. Prolonged vortex vibration can cause fatigue damage to bridges, shortening their lifespan. Flutter, a divergent, self-excited vibration that occurs at high wind speeds, is highly detrimental to bridges. In bridge design, vortex vibration must be controlled, while flutter must be avoided.

[0003] Currently, the primary method for improving the stability of bridge girders against vortex-induced and flutter vibrations is through aerodynamic measures, such as modifying the bridge's aerodynamic shape by installing nozzles, deflectors, and dampeners on the girders. However, these measures are relatively simple, inflexible, and inefficient, and have little effect on improving bridge vortex-induced and flutter stability under complex weather conditions. Summary of the Invention

[0004] The present invention provides a bridge with improved vortex vibration and flutter stability of the main beam, aiming to improve the stability of vortex vibration and flutter of the main beam under complex meteorological conditions in a more flexible, intelligent and efficient manner.

[0005] To achieve the above-mentioned object, the present invention adopts a technical solution: providing a bridge for improving the vortex vibration and flutter stability of a main beam, comprising a main beam and a plurality of railing assemblies spaced apart along the width direction of the main beam, wherein the railing assemblies are provided on the upper surface of the main beam and extend along the length direction of the main beam, with adjacent railing assemblies forming isolation passages; the railing assemblies include:

[0006] A mounting plate is provided on the main beam and extends along the length direction of the main beam;

[0007] a rotation drive unit, provided on the main beam and drivingly connected to the mounting plate, the rotation drive unit being used to drive the mounting plate to rotate around an axis parallel to the length direction of the main beam; and

[0008] At least one railing unit is provided on the mounting plate. When there are multiple railing units, the multiple railing units are spaced apart along the length direction of the mounting plate. The railing unit includes two fixed columns and multiple cross bars. The two fixed columns are spaced apart along the length direction of the mounting plate. The fixed columns are provided with a slide groove in the vertical direction. The cross bar is connected between the two fixed columns. The cross bar slides in cooperation with the slide groove. The multiple cross bars are spaced apart from top to bottom.

[0009] In one possible implementation, a first accommodating groove is provided on the upper surface of the main beam, the first accommodating groove extends along the length direction of the main beam, the cross-section of the first accommodating groove is semicircular, the bottom of the mounting plate is a semi-cylindrical surface adapted to the first accommodating groove, and a semi-annular gear ring is provided at the bottom of the mounting plate, and the output shaft of the rotary drive unit engages with the gear ring for transmission.

[0010] In one possible implementation, a drainage hole is provided at the bottom of the first accommodating tank. One end of the drainage hole communicates with the first accommodating tank, and the other end of the drainage hole extends to the bottom or side of the main beam, allowing water to drain downward under the action of gravity. A rain sensor is provided within the drainage hole, and a valve mechanism is provided at the outlet end of the drainage hole to control the opening and closing of the drainage hole.

[0011] In a possible implementation, the railing unit further includes a lifting drive mechanism, and the lifting drive mechanism includes:

[0012] A plurality of screw rods are arranged in the slide groove at intervals along the length of the mounting plate, the screw rods are arranged vertically, the number of the screw rods corresponds to the number of the cross rods, and each cross rod has a threaded hole and a plurality of guide holes; wherein the threaded hole of the cross rod is threadedly engaged with the corresponding screw rod, and the guide holes are slidably engaged with the remaining screw rods; and

[0013] A plurality of driving members are respectively arranged on the fixed columns, and the driving members correspond to the screw rods one by one and are used to drive the corresponding screw rods to rotate around their own axes.

[0014] In a possible implementation, the crossbar includes:

[0015] a separator in the shape of a long rod; and

[0016] Two sliding parts are respectively arranged at two ends of the partition part, and the sliding parts have the threaded hole and the guide hole.

[0017] In one possible implementation, a first adjustment slot is provided at the bottom of the partition, an adjustment plate and a first telescopic rod are accommodated in the first adjustment slot, the adjustment plate is provided with a second adjustment slot opposite to the first adjustment slot, one end of the first telescopic rod is connected to the bottom of the first adjustment slot, and the other end is connected to the bottom of the second adjustment slot, and the first telescopic rod is used to drive the adjustment plate to move so that the adjustment plate extends from or is retracted into the adjustment slot.

[0018] In one possible implementation, a storage bin is provided on the upper surface of the mounting plate, the storage bin is located between the two fixed columns, the lower end of the screw rod extends into the storage bin, and the cross bar has a storage state of being accommodated in the storage bin and an isolation state of being removed from the storage bin.

[0019] In a possible implementation, a protective cover is provided on the top of the storage bin, and the protective cover is slidably arranged in a horizontal direction.

[0020] In one possible implementation, a second accommodating groove is provided at the bottom of the main beam, and the second accommodating groove extends along the length direction of the main beam. A second telescopic rod is provided in the second accommodating groove, and the lower end of the second telescopic rod is connected to the maintenance vehicle track. The second telescopic rod is used to drive the maintenance vehicle track to extend from the second accommodating groove or be received in the second accommodating groove. When the maintenance vehicle track is received in the second accommodating groove, the bottom of the maintenance vehicle track can close the opening of the second accommodating groove.

[0021] In a possible implementation, the bridge for improving the vortex vibration and flutter stability of the main beam further includes a meteorological environment identification component, and the meteorological environment identification component includes an anemometer and a wind vane respectively provided on the main beam.

[0022] Compared with the prior art, the bridge provided by the present invention improves the vortex vibration and flutter stability of the main beam, which has the following beneficial effects:

[0023] The present invention provides a bridge for improving the vortex vibration and flutter stability of a main beam, comprising a main beam and multiple railing assemblies disposed on the main beam. The railing assemblies include a mounting plate, a rotary drive unit, and a railing unit. The mounting plate is rotationally coupled to the main beam, and the rotary drive unit is in transmission connection with the mounting plate. The railing assembly can adjust its inclination angle and direction, enabling the railing assembly to not only have the blocking and separating functions of a conventional railing but also to change the aerodynamic profile of the main beam. The mounting plate is provided with multiple railing units, each comprising two opposed fixed posts and multiple crossbars. The multiple crossbars are movably disposed on the fixed posts, allowing the height of the railing assembly to be changed, and thus the aerodynamic profile of the main beam to be changed.

[0024] The present invention provides a rotatable railing assembly and a liftable crossbar, so that the main beam has a variety of achievable aerodynamic shapes, can flexibly change the aerodynamic shape of the main beam, meet the stability requirements of the main beam against vortex vibration and flutter in different wind environments, and solve the problem that existing bridges lack reliable response measures when facing complex wind environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A perspective view of a bridge with improved vortex vibration and flutter stability of a main beam provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0029] Figure 3 An internal cross-sectional view of a bridge for improving the vortex vibration and flutter stability of a main beam provided in an embodiment of the present application;

[0030] Figure 4 This is a partial schematic diagram of the mounting plate and railing unit in an embodiment of the present application;

[0031] Figure 5 This is a schematic structural diagram of the crossbar in an embodiment of the present application;

[0032] Figure 6 This is an internal cross-sectional view of the partition in the embodiment of the present application;

[0033] Figure 7 This is a schematic structural diagram of another possible implementation of the lifting drive mechanism in the embodiment of the present application;

[0034] Figure 8 This is the relationship diagram of the critical wind speed of the main beam flutter under different wind attack angles and bridge deck conditions measured by wind tunnel tests;

[0035] Figure 9 The critical wind speed relationship diagram of the main beam flutter under different wind attack angles and handrail heights measured by wind tunnel tests;

[0036] Figure 10 This is a diagram showing the critical wind speed relationship of the main beam flutter under different wind attack angles and railing inclination angles measured through wind tunnel tests;

[0037] Figure 11 Schematic diagram of the position of the main beam at wind attack angles of -3°, 0° and +3 degrees.

[0038] Description of reference numerals:

[0039] 1. Main beam; 101. First accommodating groove; 102. Drain hole; 103. Second accommodating groove; 104. Second telescopic rod; 2. Handrail assembly; 3. Maintenance vehicle track; 10. Mounting plate; 11. Ring gear; 12. Storage compartment; 20. Handrail unit; 21. Fixed column; 22. Cross bar; 221. Partition; 222. Sliding part; 2221. Threaded hole; 2222. Guide hole; 223. Adjustment plate; 224. First telescopic rod; 23. Lifting drive mechanism; 231. Screw; 232. Drive member; 233. Rack; 234. Travel gear. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0042] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures. These relative terms include, for example, "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "rear," and the like. Such spatially relative terms are intended to encompass different orientations of the device during use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, changes position, or changes motion, these directional indications will change accordingly. For example, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations. The device may be oriented differently (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0043] Please also refer to Figures 1 to 11, the following describes a bridge for improving the vortex vibration and flutter stability of the main beam provided by an embodiment of the present invention.

[0044] See also Figure 1 and Figure 2 An embodiment of the present invention provides a bridge that improves the vortex vibration and flutter stability of a main beam. The bridge primarily comprises a main beam 1 and a plurality of guardrail assemblies 2 spaced apart along the width of the main beam 1. The guardrail assemblies 2 are disposed on the upper surface of the main beam 1 and extend along the length of the main beam 1. Adjacent guardrail assemblies 2 form isolation passages. The isolation passages can be used for pedestrians, bicycles, and vehicles, and can also be used to establish green belts. The guardrail assembly 2 includes a mounting plate 10, a rotation drive unit, and a guardrail unit 20. The mounting plate 10 is provided on the main beam 1 and extends along the length direction of the main beam 1; the rotation drive unit is provided on the main beam 1 and is transmission-connected to the mounting plate 10, and the rotation drive unit is used to drive the mounting plate 10 to rotate around an axis parallel to the length direction of the main beam 1; at least one railing unit 20 is provided on the mounting plate 10. When there are multiple railing units 20, the multiple railing units 20 are spaced apart along the length direction of the mounting plate 10. The railing unit 20 includes two fixed columns 21 and multiple cross bars 22. The two fixed columns 21 are spaced apart along the length direction of the mounting plate 10. The fixed columns 21 are provided with a slide groove in the vertical direction. The cross bar 22 is connected between the two fixed columns 21. The cross bar 22 slides in cooperation with the slide groove. The multiple cross bars 22 are spaced apart from top to bottom.

[0045] Compared with the prior art, the embodiment of the present invention provides a bridge that improves the vortex vibration and flutter stability of the main beam, which has the following beneficial effects:

[0046] A bridge for improving the vortex vibration and flutter stability of a main beam provided by an embodiment of the present invention includes a main beam 1 and a plurality of railing assemblies 2 disposed on the main beam 1. The railing assemblies 2 include a mounting plate 10, a rotational drive unit, and a railing unit 20. The mounting plate 10 is rotationally coupled to the main beam 1, and the rotational drive unit is transmission-connected to the mounting plate 10. The railing assembly 2 can adjust its tilt angle and tilt direction, so that the railing assembly 2 not only has the blocking and separating functions of a conventional railing, but also has the function of changing the aerodynamic shape of the main beam 1. The mounting plate 10 is provided with a plurality of railing units 20. The railing units 20 include two fixed columns 21 disposed opposite each other and a plurality of crossbars 22. The plurality of crossbars 22 are movably disposed on the fixed columns 21, thereby changing the height of the railing assembly 2 and, consequently, the aerodynamic shape of the main beam 1.

[0047] The embodiment of the present invention provides a rotatable railing assembly 2 and a liftable cross bar 22, so that the main beam 1 has a variety of achievable aerodynamic shapes, can flexibly change the aerodynamic shape of the main beam 1, meet the stability requirements of the main beam 1 against vortex vibration and flutter in different wind environments, and solve the problem that existing bridges lack reliable response measures when facing complex wind environments.

[0048] In the embodiment of the present invention, the main beam 1 is an existing bridge structure, such as a streamlined box beam, a steel box beam, etc. There is no specific restriction on the length, width, aspect ratio and other parameters of the main beam 1, and the user can set them according to actual conditions.

[0049] Multiple railing assemblies 2 are arranged in parallel on the main beam 1. The railing assemblies 2 are composed of a mounting plate 10, a rotational drive unit, and a railing unit 20. The mounting plate 10 is arranged on the bridge deck of the main beam 1 and rotates in conjunction with the main beam 1. Optionally, the mounting plate 10 can be embedded in the bridge deck or protrude from the bridge deck of the main beam 1. The cross-sectional shape of the mounting plate 10 can be square, circular, semicircular, fan-shaped, triangular, etc. The rotational drive unit is used to drive the mounting plate 10 to rotate about a horizontal axis parallel to the length of the main beam 1. The rotational drive unit can be an existing rotational drive device such as a drive motor or a hydraulic drive motor. One or more rotational drive devices can be provided as needed to meet the rotational adjustment requirements of the railing assembly 2. Power transmission between the rotational drive unit and the rotating shaft of the mounting plate 10 can be achieved through gear meshing transmission, chain transmission, etc., and a speed-reducing and torque-increasing transmission device such as a reducer can be provided between the output shaft of the rotational drive unit and the rotating shaft of the mounting plate 10 as needed.

[0050] The railing unit 20 comprises two fixed columns 21 and a crossbar 22. Two fixed columns 21 are positioned opposite each other, with space between them forming a space for the crossbar 22. The ends of the crossbar 22 are housed in slots in the two fixed columns 21, allowing the crossbar 22 to move up and down, thereby changing the aerodynamic shape of the main beam 1. Optionally, the crossbar 22 can be hydraulically driven along the slots, or its position can be manually adjusted. The fixed columns 21 and crossbar 22 can be made of steel or other materials.

[0051] The railing assembly 2 can be divided into sidewalk railings, anti-collision railing systems, central isolation railings, etc. according to their functions.

[0052] It should be noted that in order to clearly understand which aerodynamic shape of the main beam 1 has better vortex vibration and flutter stability in different wind environments, it is necessary to make a bridge model, and then simulate the bridge model through a wind tunnel test. According to the test results, a corresponding adjustment strategy is formulated, and the adjustment strategy is applied to the actual bridge under construction to provide data support for the adjustment of the aerodynamic shape of the bridge.

[0053] See also Figures 1 to 4In some possible embodiments, a first accommodating groove 101 is provided on the upper surface of the main beam 1. The first accommodating groove 101 extends along the length direction of the main beam 1. The cross-section of the first accommodating groove 101 is semicircular. The bottom of the mounting plate 10 is a semi-cylindrical surface adapted to the first accommodating groove 101. A semi-annular gear ring 11 is provided at the bottom of the mounting plate 10. The output shaft of the rotary drive unit engages with the gear ring 11 for transmission.

[0054] By controlling the rotation direction of the rotary drive unit (clockwise or counterclockwise), the tilt direction of the railing assembly 2 can be changed, so that the railing assembly 2 is tilted toward the inside or outside of the bridge. By controlling the output angle of the rotary drive unit, the tilt angle of the railing assembly 2 can be changed, for example, to 20°, 30°, 80°, 90°, etc.

[0055] See also Figure 3 In some possible embodiments, a drainage hole 102 is provided at the bottom of the first receiving tank 101. One end of the drainage hole 102 communicates with the first receiving tank 101, and the other end of the drainage hole 102 extends to the bottom or side of the main beam 1, allowing water to drain downward under the action of gravity. The drainage hole 102 can be formed directly on the main beam 1 or by providing a drainage pipe, as long as it can prevent water from accumulating in the first receiving tank 101.

[0056] To prevent birds from nesting in drain hole 102, a valve mechanism is installed at the outlet of drain hole 102. This valve mechanism controls the opening and closing of drain hole 102. Specifically, the valve mechanism can be a conventional electronically controlled ball valve, solenoid valve, or other valve that can be used to control the opening and closing of pipes. A rain sensor is installed within drain hole 102. When the rain sensor detects water in drain hole 102, it controls the valve mechanism to open and drain water. Once water is drained, the valve mechanism closes promptly to prevent birds from entering drain hole 102.

[0057] See also Figure 2 and Figure 4 In some possible embodiments, the railing unit 20 further includes a lifting drive mechanism 23, which includes a screw rod 231 and a drive member 232. A plurality of screw rods 231 are spaced apart in the slide groove along the length direction of the mounting plate 10. The screw rods 231 are vertically arranged. The number of screw rods 231 corresponds to the number of cross bars 22. Each cross bar 22 has a threaded hole 2221 and a plurality of guide holes 2222. The threaded hole 2221 of the cross bar 22 is threadedly engaged with the corresponding screw rod 231, and the guide holes 2222 are slidably engaged with the remaining screw rods 231. The plurality of drive members 232 are respectively provided on the fixed column 21. The drive members 232 correspond one-to-one with the screw rod 231 and are used to drive the corresponding screw rod 231 to rotate around its own axis.

[0058] In this embodiment, the lifting drive mechanism 23 is used to drive the crossbar 22 to move vertically. The lifting drive mechanism 23 includes a plurality of screw rods 231 arranged side by side. Each screw rod 231 is controlled to rotate by an independent driving member 232. The plurality of screw rods 231 can rotate independently without affecting each other. The number of screw rods 231 corresponds to the number of crossbars 22. The crossbar 22 has a plurality of guide holes 2222 and a threaded hole 2221. The threaded hole 2221 is threadedly engaged with one of the screw rods 231, and the guide hole 2222 is slidably engaged with the remaining plurality of screw rods 231. With such an arrangement, the crossbar 22 can be raised and lowered by controlling a specific screw rod 231. At the same time, during the raising and lowering process of the crossbar 22, the remaining screw rods 231 play a guiding role.

[0059] The lifting drive mechanism 23 provided in this embodiment is disposed within the fixed column 21, resulting in a compact structure. A common motor can be used as the driving member 232, facilitating installation. A guide hole 2222 and a threaded hole 2221 are provided at the end of the crossbar 22. There are no special requirements for the specific shape and structure of the crossbar 22, facilitating ease of manufacture.

[0060] In addition to the above implementation methods, Figure 7 As shown, the lifting drive mechanism 23 includes a rack vertically arranged on the fixed column 21, and a traveling gear and a motor are set at the end of the cross bar 22. The traveling gear is engaged with the rack for transmission, and the motor drives the traveling gear to rotate, so that the cross bar 22 can move up and down along the rack.

[0061] See also Figure 5 In some possible embodiments, the cross bar 22 includes a partition 221 and two sliding parts 222, the partition 221 is in the shape of a long rod; the two sliding parts 222 are respectively arranged at both ends of the partition 221, and the sliding part 222 has a threaded hole 2221 and a guide hole 2222, the threaded hole 2221 is used to threadably cooperate with one of the screw rods 231, and the guide hole 2222 is used to slide with the remaining screw rods 231.

[0062] Considering that the air permeability of the guardrail assembly 2 will change when the guardrail assembly 2 changes its own inclination angle or the height of the crossbar 22, the change in air permeability may cause the wind resistance of the bridge to deteriorate. Figure 5 and Figure 6In some possible embodiments, a first adjustment slot is defined at the bottom of the partition 221. An adjustment plate 223 and a first telescopic rod 224 are positioned within the first adjustment slot. The adjustment plate 223 defines a second adjustment slot opposite the first adjustment slot. One end of the first telescopic rod 224 is connected to the bottom of the first adjustment slot, and the other end is connected to the bottom of the second adjustment slot. The first telescopic rod 224 is used to drive the adjustment plate 223 to move, thereby extending the adjustment plate 223 from or retracting it into the adjustment slot. The first telescopic rod 224 can be an electric telescopic rod, a pneumatic push rod, or the like. To achieve a more compact overall structure, the first adjustment slot is defined at the bottom of the partition 221, and the second adjustment slot is defined at the top of the adjustment plate 223. The first telescopic rod 224 is accommodated within the first and second adjustment slots.

[0063] In this embodiment, a first adjustment slot is defined below the divider 221 of the crossbar 22. An adjustment plate 223 is slidably disposed within the first adjustment slot. When the airflow rate of the handrail assembly 2 changes, the adjustment plate 223 can be retracted and extended to maintain the original airflow rate, eliminating potential risks. If desired, a further retractable plate can be positioned below the adjustment plate 223 to form a multi-section retractable structure. The retractable plate's placement and actuation are similar to those of the adjustment plate 223, and it can also be retracted and extended using an electric telescopic rod. This will not be further described here.

[0064] See also Figure 4 In some possible embodiments, a storage bin 12 is provided on the upper surface of the mounting plate 10. The storage bin 12 is located between two fixed columns 21. The lower end of the screw rod 231 extends into the storage bin 12. The cross bar 22 has a storage state in the storage bin 12 and an isolation state removed from the storage bin 12. When the cross bar 22 is completely stored in the storage bin 12, the main beam 1 forms a bare beam, which can further optimize the aerodynamic shape of the main beam 1.

[0065] In some possible embodiments, a protective cover is provided on the top of the storage bin 12, and the protective cover is slidably arranged in the horizontal direction. During normal use, the protective cover is provided on the top of the storage bin 12 to prevent water, garbage and other objects from entering.

[0066] Optionally, the protective cover can be made of a metal plate, and the protective cover can be opened or closed by a hydraulic cylinder.

[0067] See also Figure 3In some possible embodiments, a second accommodating groove 103 is provided at the bottom of the main beam 1, and the second accommodating groove 103 extends along the length direction of the main beam 1. A second telescopic rod 104 is provided in the second accommodating groove 103, and the lower end of the second telescopic rod 104 is connected to the maintenance vehicle track 3. The second telescopic rod 104 is used to drive the maintenance vehicle track 3 to extend from the second accommodating groove 103 or be retracted into the second accommodating groove 103. When the maintenance vehicle track 3 is retracted into the second accommodating groove 103, the bottom of the maintenance vehicle track 3 can close the opening of the second accommodating groove 103, thereby further optimizing the aerodynamic shape of the main beam 1.

[0068] In some possible embodiments, a bridge for improving the vortex vibration and flutter stability of a main beam further includes a meteorological environment identification component. The meteorological environment identification component includes an anemometer and a wind vane, respectively, disposed on the main beam 1. The anemometer and wind vane are used to monitor the wind environment of the bridge in real time and transmit the data to a control center, so that the control center can adopt appropriate control strategies based on the current wind environment. The wind vane and anemometer can be commercially available products, and their specific specifications and models are not limited.

[0069] In combination with the contents of the above embodiments, the working principle thereof is specifically described below:

[0070] The present invention provides a bridge with improved vortex vibration and flutter stability of the main beam. The meteorological conditions are monitored in real time by a meteorological environment recognition component. The shapes of components such as the railing assembly 2 and the maintenance vehicle track 3 are adjusted by using driving components such as hydraulic cylinders, drive motors, and electric telescopic rods, so that the aerodynamic shape of the main beam 1 is optimized. The main beam 1 has a variety of different aerodynamic shapes, thereby flexibly, intelligently, and efficiently responding to the occurrence of vortex vibration of the main beam 1 under complex meteorological conditions, while avoiding the occurrence of flutter and improving the stability of the bridge.

[0071] In actual applications, the corresponding aerodynamic shape control strategies for different wind environments are already recorded in the control center. The control center can be a single controller or a control location managed by a dedicated staff. In other words, the bridge's aerodynamic shape can be adjusted automatically by a pre-set controller or manually on-site through remote control or other means.

[0072] The intelligent meteorological environment recognition component monitors the current wind angle and speed. The control center receives this data and selects a solution from a library that matches the current wind conditions. After specifying a control strategy, the control center remotely controls related equipment via wireless network signals and PLC control programs. This includes adjusting the inclination angle, air permeability, and height of the railing assembly 2, optimizing the aerodynamic shape of the main beam 1 to suppress vortex vibration amplitude and improve flutter stability.

[0073] like Figure 1 and Figure 3 As shown, taking a streamlined box girder with a width-to-height ratio of 10:1 as an example, when the bridge is in normal operation, it is in a completed state, and vehicles and pedestrians can pass normally. The bridge deck is installed with a railing assembly 2 and a maintenance vehicle track 3. In the completed state, the railing assembly 2 is vertical, and the maintenance vehicle track 3 is exposed. The normal height of the sidewalk railing can be specifically 0.34 times the beam height (the height of the main beam 1 is defined as H, and the height of the railing assembly 2 is 0.34H) and 81.50% air permeability. In different control strategies, the height and air permeability of the crossbar 22 can be increased or decreased as needed. For example, the maximum height of the crossbar 22 can be 0.54H. The height and air permeability of the anti-collision railing between the motor vehicle lane and the sidewalk and the central isolation railing between the two-way motor vehicle lanes can be the same as or different from those of the sidewalk railing.

[0074] Since the railing assemblies 2 on the outermost edges of the main beam 1 serve as sidewalk railings, they are located close to the edge of the main beam 1 and are therefore the locations requiring the most attention. Aerodynamic shape adjustments specifically involve changing the height, inclination, air permeability, and bridge deck conditions of the sidewalk railings. Of course, the height and inclination of the crash barriers and central isolation railings on the inner side of the bridge can also be adjusted as needed.

[0075] The bridge deck state of the main beam 1 includes a completed bridge state during normal operation and a bare beam state when the bridge is out of operation. In the completed bridge state, the crossbar 22 and the maintenance vehicle track 3 are exposed to the outside world and can be operated normally. In the bare beam state, the crossbar 22 and the maintenance vehicle track 3 do not exist on the bridge deck. At this time, the entire bridge needs to be closed and traffic is prohibited. The railing assembly 2 can be tilted toward the inside of the bridge, referred to as inward tilting, or it can be tilted toward the outside of the bridge, referred to as outward tilting.

[0076] The meteorological environment recognition component measures the wind speed and angle of attack of the bridge's wind environment. The anemometer detects the incoming wind speed in real time, while the wind vane measures the angle of the incoming wind relative to the main girder 1. The collected wind speed and angle of attack data are transmitted in real time to the terminal controller, which performs dimensionless processing on the wind speed and determines the wind speed level. Dimensionless processing is a conventional technique, and its specific implementation will not be detailed here.

[0077] The relationship between wind speed and vibration range is defined as follows: when the dimensionless wind speed is less than or equal to 2.5m / s, it is the vortex vibration range, recorded as Class A wind speed; when the dimensionless wind speed is greater than 2.5m / s but less than or equal to 3.5m / s, it is the flutter test range, recorded as Class B wind speed; when the dimensionless wind speed is greater than 3.5m / s but less than or equal to 4.8m / s, it is the flutter critical range, recorded as Class C wind speed; when the dimensionless wind speed is greater than 4.8m / s, it is the flutter range, recorded as Class D wind speed.

[0078] The controller classifies the wind attack angle into categories. For example, it defines: -3° wind attack angle as Class A angle, 0° wind attack angle as Class B angle, and +3° wind attack angle as Class C angle. The wind attack angle diagram is shown in the figure below. Figure 11 As shown, Figure 11 The rectangle at the mid-coordinate origin represents the cross section of main beam 1.

[0079] The controller compares wind speed and angle of attack data with a library of control strategy solutions, selects a matching aerodynamic shape solution from the library, and then sends adjustment instructions related to this aerodynamic shape to the corresponding drive device to adjust the bridge's aerodynamic shape. Of course, there are other ways to control wind-induced vibrations in bridges, such as installing a tuned mass damper (TMD). The technical solution provided by this invention is used to modify the aerodynamic shape of a bridge. In practical applications, it does not conflict with the installation of a damper and can be used simultaneously.

[0080] In the solution library, the stored data and their corresponding aerodynamic measures and solutions are shown in Table 1.

[0081] Table 1: Solution library for different control strategies

[0082]

[0083] In the above scheme, the control strategies for wind attack angles of 0°, -3° and +3° are recorded. In actual application, corresponding control strategies for other wind attack angles can also be recorded without limitation.

[0084] When the controller issues the instruction "adjust to bridge state": the mounting plate 10 of the railing assembly 2 starts to rotate under the drive of the rotary drive unit and the ring gear, so that the railing assembly 2 is in a vertical state, the height of the cross bar 22 at the highest position is 0.34H, and the air permeability is adjusted to 81.50% by extending or contracting the adjustment plate, and the maintenance vehicle track 3 extends downward from the bottom of the main beam 1.

[0085] When the controller issues the instruction "adjust to bare beam state": the storage bin opens, the cross bar 22 moves downward into the storage bin, and then the protective cover is closed, and the fixed column 21 remains unchanged; the maintenance vehicle track 3 moves into the second accommodating groove under the drive of the second telescopic rod 104.

[0086] When the controller issues the instruction "lower the height of the sidewalk railing to 0.24H": the outermost railing assembly 2, i.e. the sidewalk railing, is in a vertical state, the height of the highest crossbar 22 is adjusted to 0.24H (H is the height of the main beam 1), and the air permeability is adjusted to 81.50% by retracting the adjustment plate, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1 under the drive of the second telescopic rod 104.

[0087] When the controller issues the instruction "lower the sidewalk railing height to 0.44H": similarly, the sidewalk railing is adjusted to a vertical state, the maximum height of the crossbar 22 is 0.44H, the air permeability is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0088] When the controller issues the instruction "lower the height of the sidewalk railing to 0.54H": similarly, the sidewalk railing is adjusted to a vertical state, the maximum height of the crossbar 22 is 0.54H, the air permeability is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0089] When the instruction is "sidewalk railing tilted inward 20°": the inclination angle of the outermost sidewalk railing is adjusted to 20° toward the inside of the bridge, the maximum height of the crossbar 22 is 0.34H, the air permeability is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0090] When the instruction is "sidewalk railing tilted outward 20°": Similarly, the inclination angle of the sidewalk railing is adjusted to 20° toward the outside of the bridge, the maximum height of the crossbar 22 is 0.34H, the air permeability is 81.50%, and the maintenance vehicle track 3 extends out of the bottom of the main beam 1.

[0091] When the command is “Start TMD tuned mass damper”: the system turns on the TMD tuned mass damper pre-installed on the bridge.

[0092] It should be noted that the above is only an example of a bridge control strategy and is not a limitation for actual application. In actual application, users can set the relevant parameters and actions of the control strategy according to the situation.

[0093] The reliability of the proposed scheme was verified through wind tunnel tests, using three wind attack angles of -3°, 0°, and +3°. Within each wind attack angle, both the bare beam and completed bridge conditions were tested. The completed bridge condition included guardrail assembly 2 configurations with varying crossbar 22 heights (0.24H, 0.34H, 0.44H, and 0.54H) and angles of inclination (vertical, 20° inward, and 20° outward). Using the guardrail assembly 2 with a crossbar 22 height of 0.34H and a vertical position as the baseline, vortex-induced vibration and flutter tests were conducted on the main beam 1. The occurrence of vortex-induced vibration and the critical flutter wind speed for the main beam 1 under different operating conditions were determined.

[0094] Table 2 Wind-induced vibration of main beam 1 obtained from wind tunnel test

[0095]

[0096] The details of the test results are shown in Table 2 above, and Figure 8 、 Figure 9 and Figure 10 From Table 2 and Figure 8 、 Figure 9 and Figure 10 It can be seen that under different wind attack angle conditions, under Class A wind speed, due to the low wind speed, the system will give priority to aerodynamic measures that prevent vortex vibration of the bridge and ensure normal operation of the bridge; under Class B wind speed, since the flutter test wind speed has not been reached, the system will uniformly choose to adjust to the completed bridge state and increase the acquisition frequency to closely monitor the wind environment; under Class C wind speed, since the wind speed exceeds the flutter test wind speed but has not yet approached the flutter critical wind speed, the system will turn on the flutter warning and give priority to taking aerodynamic measures with the highest flutter critical wind speed; under Class D wind speed, since the wind speed approaches the flutter critical wind speed, flutter may occur, so while turning on the flutter warning and taking aerodynamic measures with the highest flutter critical wind speed, the TMD tuned mass damper is enabled to suppress vibration.

[0097] Through the above control strategy scheme, the bridge can adjust the aerodynamic shape of the main beam 1 in real time, automatically, flexibly and diversely according to the wind environment, thereby improving the wind resistance stability of the main beam 1 against vortex vibration and flutter in complex wind environments.

[0098] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above description is a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A bridge with improved vortex vibration and flutter stability of the main beam, characterized in that: The invention comprises a main beam (1), and a plurality of railing assemblies (2) arranged at intervals along the width direction of the main beam (1), wherein the railing assemblies (2) are arranged on the upper surface of the main beam (1) and extend along the length direction of the main beam (1); the railing assemblies (2) comprise: A mounting plate (10) is provided on the main beam (1) and extends along the length direction of the main beam (1); a rotation drive unit, provided on the main beam (1) and in transmission connection with the mounting plate (10), the rotation drive unit being used to drive the mounting plate (10) to rotate around an axis parallel to the length direction of the main beam (1); and A plurality of railing units (20) are arranged on the mounting plate (10) at intervals along the length direction of the mounting plate (10), the railing units (20) comprising two fixed columns (21) and a plurality of cross bars (22), the two fixed columns (21) being arranged at intervals along the length direction of the mounting plate (10), the fixed columns (21) having a vertical slide groove, the cross bar (22) being connected between the two fixed columns (21), the cross bar (22) being slidably engaged with the slide groove, and the plurality of cross bars (22) being arranged at intervals from top to bottom; The crossbar (22) comprises: A partition (221) in the shape of a long rod; and Two sliding parts (222) are respectively provided at two ends of the partition part (221), and the sliding parts (222) have a threaded hole (2221) and a guide hole (2222); A first adjustment slot is provided at the bottom of the partition (221), wherein an adjustment plate (223) and a first telescopic rod (224) are accommodated in the first adjustment slot. The adjustment plate (223) is provided with a second adjustment slot opposite to the first adjustment slot. One end of the first telescopic rod (224) is connected to the bottom of the first adjustment slot, and the other end is connected to the bottom of the second adjustment slot. The first telescopic rod (224) is used to drive the adjustment plate (223) to move, so that the adjustment plate (223) extends from or is retracted into the first adjustment slot.

2. A bridge for improving vortex vibration and flutter stability of main beams according to claim 1, characterized in that: A first accommodating groove (101) is provided on the upper surface of the main beam (1), the first accommodating groove (101) extends along the length direction of the main beam (1), the cross section of the first accommodating groove (101) is semicircular, the bottom of the mounting plate (10) is a semi-cylindrical surface adapted to the first accommodating groove (101), a semi-annular gear ring (11) is provided at the bottom of the mounting plate (10), and the output shaft of the rotary drive unit is meshed with the gear ring (11) for transmission.

3. A bridge for improving vortex vibration and flutter stability of main beams according to claim 2, characterized in that: A drainage hole (102) is provided at the bottom of the first accommodating groove (101), one end of the drainage hole (102) is communicated with the first accommodating groove (101), and the other end of the drainage hole (102) extends to the bottom or side of the main beam (1), a rain sensor is provided in the drainage hole (102), and a valve mechanism is provided at the outlet end of the drainage hole (102), and the valve mechanism is used to control the opening and closing of the drainage hole (102).

4. The bridge for improving vortex vibration and flutter stability of main beam according to claim 1, characterized in that: The handrail unit (20) further comprises a lifting drive mechanism (23), wherein the lifting drive mechanism (23) comprises: A plurality of screw rods (231) are arranged in the slide groove at intervals along the length direction of the mounting plate (10), the screw rods (231) are arranged vertically, the number of the screw rods (231) corresponds to the number of the cross rods (22), and each cross rod (22) has a threaded hole (2221) and a plurality of guide holes (2222); wherein the threaded hole (2221) of the cross rod (22) is threadedly engaged with one of the screw rods (231), and the guide holes (2222) are slidably engaged with the remaining screw rods (231) in a one-to-one correspondence; and A plurality of driving members (232) are respectively provided on the fixed columns (21), and the driving members (232) correspond one-to-one to the screw rods (231) and are used to drive the corresponding screw rods (231) to rotate around their own axes.

5. A bridge for improving vortex vibration and flutter stability of main beams according to claim 4, characterized in that: A storage bin (12) is provided on the upper surface of the mounting plate (10), and the storage bin (12) is located between the two fixed columns (21). The lower end of the screw rod (231) extends into the storage bin (12), and the cross bar (22) has a storage state in which it is accommodated in the storage bin (12), and an isolation state in which it is removed from the storage bin (12).

6. A bridge for improving vortex vibration and flutter stability of main beams according to claim 5, characterized in that: A protective cover is provided on the top of the storage bin (12), and the protective cover is slidably arranged in a horizontal direction.

7. The bridge for improving the vortex vibration and flutter stability of the main beam according to claim 1, characterized in that: A second receiving groove (103) is provided at the bottom of the main beam (1), and the second receiving groove (103) extends along the length direction of the main beam (1). A second telescopic rod (104) is provided in the second receiving groove (103), and the lower end of the second telescopic rod (104) is connected to the maintenance vehicle track (3). The second telescopic rod (104) is used to drive the maintenance vehicle track (3) to extend from the second receiving groove (103) or to be received in the second receiving groove (103). When the maintenance vehicle track (3) is received in the second receiving groove (103), the bottom of the maintenance vehicle track (3) can close the opening of the second receiving groove (103).

8. The bridge for improving the vortex vibration and flutter stability of the main beam according to claim 1, characterized in that: The bridge for improving the vortex vibration and flutter stability of the main beam further comprises a meteorological environment identification component, wherein the meteorological environment identification component comprises an anemometer and a wind vane respectively arranged on the main beam (1).

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