Device for adjusting the model of the vortex-induced vibration interference test of the main girder of a twin-span bridge

Abstract

The application provides a device for assisting in adjusting a vortex vibration interference test model of a double-width bridge main beam, comprising two fixed frames, two moving frames, a plurality of elastic frames and two segment models; the two fixed frames are arranged at intervals along a first path; the two moving frames are arranged at intervals along the first path, and the moving frames move along a second path; the plurality of elastic frames are respectively rotationally connected to the fixed frames or the moving frames, and can slide in an up-down direction; the elastic frames are respectively provided with elastic members at upper and lower ends inside the elastic frames; and two connecting blocks are connected between the two elastic members; and the two segment models are respectively connected to the two opposite connecting blocks at two ends. The device for assisting in adjusting the vortex vibration interference test model of the double-width bridge main beam can flexibly adjust the angle of the elastic frame in a large wind attack angle range, and can ensure that the two segment models always maintain a parallel state through cooperation between the connecting blocks and the magnets during the adjustment process.

Description

Technical Field

[0001] This application belongs to the field of wind tunnel vibration testing technology, specifically relating to a device for adjusting a test model of vortex-induced vibration interference of a double-span bridge main beam. Background Technology

[0002] With the continuous improvement of bridge construction technology, long-span double-span bridges are frequently seen in mountainous terrain with a wider range of wind attack angles. It is necessary to test their models in wind tunnels to detect their wind resistance performance under high wind attack angles, so as to avoid vortex-induced vibration affecting driving comfort or even causing structural fatigue damage.

[0003] Segmental model wind tunnel vibration test is an important means of testing and studying the vortex-induced vibration characteristics of double-span bridges. However, the current segmental model wind tunnel vibration test has the following shortcomings: (1) It is impossible to accurately and quickly change the wind attack angle of the double-span bridge main beam model; (2) The suspension components of the model in the existing technology are too long and cannot suppress the swaying of the double-span bridge main beam model in the wind direction; (3) It is impossible to ensure that the direction of spring tension is always perpendicular to the model plane, which will significantly affect the accuracy of the test results under high wind attack angle; (4) It is difficult to ensure that the stiffness of the test device is sufficient and cannot eliminate the problem of resonance transmission between the double-span bridge main beam models; (5) When changing the model position (such as adjusting the vertical position, horizontal spacing, wind attack angle), it is difficult to ensure that the tension length of the spring does not change, which causes the structural damping to change and seriously affects the accuracy of the test results; (6) The existing technology mainly uses the method of tightening and loosening turnbuckles to adjust the vertical spacing of the model, which is time-consuming and laborious and it is difficult to ensure the synchronization of the two sides of the model and the adjustment accuracy. Summary of the Invention

[0004] This application provides a device for adjusting the test model of vortex-induced vibration interference of the main beam of a double-span bridge, which aims to solve the technical problems of difficult model adjustment and inaccurate measurement results in the wind tunnel vibration test of segmental models in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A device is provided to assist in adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge, comprising:

[0007] Two fixed frames are spaced apart along the first path, with their upper and lower ends respectively abutting against the wind tunnel wall;

[0008] Two movable frames are spaced apart along a first path, and their upper and lower ends are slidably connected to the wind tunnel wall. The movable frames move along a second path, which is perpendicular to the first path.

[0009] Multiple elastic frames are rotatably connected to the fixed frame or the movable frame, and are capable of sliding in the vertical direction. The rotation axis of each elastic frame is parallel to the first path. Each elastic frame has elastic elements at its upper and lower ends, and a connecting block connects two of the elastic elements. Magnets with the same magnetic poles are respectively installed on the inner side of the connecting block and the elastic frame.

[0010] Two segment models are connected at both ends to two opposite connecting blocks, so that the two segment models are spaced apart and parallel along the second path.

[0011] In one possible implementation, the device for adjusting the vortex-induced vibration interference test model of the auxiliary double-span bridge main girder further includes:

[0012] Multiple turntables are slidably connected to the corresponding fixed frame or the movable frame in the vertical direction, and the surfaces of the multiple turntables are perpendicular to the first path. The elastic frame is rotatably connected to the turntables.

[0013] In one possible implementation, both the moving frame and the fixed frame are rectangular frames, and the turntable includes:

[0014] The connecting frame has set screw holes on both sides, and set screws are provided in the set screw holes. The set screws can be pressed against the inner side of the fixed frame or the inner side of the movable frame to limit the displacement of the connecting frame in the vertical direction.

[0015] The outer ring is installed inside the connecting frame;

[0016] An inner ring, rotatably mounted inside the outer ring, with its rotation axis parallel to the first path, is connected to the elastic frame; and

[0017] Multiple rollers are symmetrically arranged on the outer periphery of the connecting frame, and the rollers roll in cooperation with the inner side of the fixed frame or the inner side of the movable frame.

[0018] In one possible implementation, the turntable moves up and down via a lifting assembly, the lifting assembly comprising:

[0019] The upper pulley is installed on the inner top of the movable frame or the fixed frame;

[0020] A sliding wheel is installed at the inner bottom of the movable frame or the fixed frame; and

[0021] A chain is wound around the upper pulley and the lower pulley respectively, and both ends are connected to the ends of the turntable. The chain is provided with a pull handle, which drives the chain to slide, thereby driving the turntable to move up and down.

[0022] The two lower sliding wheels within the movable frame are connected by a transmission, and the two lower sliding wheels within the fixed frame are also connected by a transmission.

[0023] In one possible implementation, the fixed frame includes:

[0024] The first vertical sliding frame is a rectangular frame, and the elastic frame is slidably disposed inside the first vertical sliding frame. The top of the first vertical sliding frame is connected to the top of the wind tunnel; and

[0025] A jack is installed at the bottom of the first vertical sliding frame, and the jack is placed at the bottom of the wind tunnel.

[0026] In one possible implementation, the mobile framework includes:

[0027] The upper slide rail is installed at the top of the wind tunnel and extends along the second path;

[0028] A sliding rail, installed at the bottom of the wind tunnel, extends along the second path; and

[0029] The second vertical sliding frame is a rectangular frame, and the elastic frame is slidably disposed on the inner side of the second vertical sliding frame. The upper and lower ends of the second vertical sliding frame are slidably connected to the upper slide rail and the lower slide rail, respectively.

[0030] In one possible implementation, pulleys are installed at the upper and lower ends of the second vertical sliding frame, and the pulleys are in rolling cooperation with the upper slide rail or the lower slide rail;

[0031] The upper and lower ends of the second vertical sliding frame are also provided with vertically arranged limiting holes. The limiting holes have limiting members that can abut against the lower slide rail or the upper slide rail to limit the displacement of the second vertical sliding frame on the second path.

[0032] In one possible implementation, the resilient framework further includes:

[0033] The frame body is installed on the end face of the inner ring. Connectors are installed at the upper and lower ends of the frame body, and the connectors are respectively connected to the corresponding elastic elements.

[0034] The connecting block and the side wall of the frame body are respectively equipped with magnets so that the connecting block is located on the vertical center line of the frame body.

[0035] In one possible implementation, the end of the segment model is provided with a model fixing shaft, which passes through the connecting block.

[0036] In one possible implementation, the outer circumference of the inner ring is provided with a plurality of locking holes along its own radial direction, and the inner ring wall of the outer ring is provided with positioning holes corresponding to the locking holes. The inner ring and the outer ring are fixed relative to each other by fasteners, and the fasteners pass through the locking holes and are inserted into the positioning holes.

[0037] The device for adjusting the vortex-induced vibration interference test model of the main girder of the double-span bridge provided in this application, compared with the prior art, allows the elastic frame to rotate around an axis parallel to the first path, enabling flexible angle adjustment within the range of wind angle of attack (±5°). Furthermore, during adjustment, the cooperation between the connecting block and the magnet ensures that the two segment models remain parallel, significantly improving adjustment efficiency and accuracy. By placing magnets with the same poles on the inner side of the connecting block and the elastic frame, the lateral displacement of the connecting block is limited by the principle of like poles repulsion. This eliminates the need for excessively long suspension components, avoiding interference from windward swaying. Simultaneously, this method does not increase the damping of the model along the elastic component direction, ensuring the stability of damping parameters in the vortex-induced vibration test. The repulsive effect of the magnets keeps the connecting block always at the vertical center of the elastic frame. Regardless of the rotation angle of the elastic frame, the tensile direction of the elastic component remains perpendicular to the model plane. Even under wind angle of attack conditions (±5°), this effectively avoids the problem of decreased test accuracy due to deviation in the elastic component direction. The two segmental models are mounted on two independent support structures, a fixed frame and a movable frame, respectively. These two structures are not in direct contact, ensuring that the dynamic characteristics of the two models are independent and preventing vibration in one model from causing resonance in the other. When adjusting the wind angle of attack, horizontal spacing, and vertical spacing, the length of the elastic element remains unchanged, suppressing damping parameter fluctuations caused by adjusting the element's length and significantly improving the accuracy of the test results. The elastic frame can slide vertically, and with the limiting effect of the connecting block and magnet, the vertical displacement synchronization of the two segmental models is better during adjustment. Compared to the traditional method of tightening and loosening turnbuckles, this method offers higher adjustment efficiency and superior accuracy. Attached Figure Description

[0038] 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 or the prior art 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.

[0039] Figure 1 A schematic diagram of the device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge provided in the embodiments of this application;

[0040] Figure 2 This is an assembly diagram of the fixed frame, turntable, and elastic frame used in the embodiments of this application;

[0041] Figure 3 This is an assembly diagram of the movable frame, turntable, and elastic frame used in the embodiments of this application;

[0042] Figure 4 This is an enlarged view of the assembly of the second vertical sliding frame and the lower rail used in the embodiments of this application;

[0043] Figure 5 This is a schematic diagram of the elastic frame used in the embodiments of this application;

[0044] Figure 6 This is a schematic diagram of the structure of the turntable used in the embodiments of this application;

[0045] Figure 7 This is a schematic diagram of the assembly of the inner and outer rings used in the embodiments of this application;

[0046] Figure 8 This is a schematic diagram of the assembly of the lower pulley and the second driven pulley used in an embodiment of this application;

[0047] Figure 9 This is a schematic diagram of the assembly of the lower pulley and the first driven pulley used in the embodiments of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Fixed frame; 11. First vertical sliding frame; 12. Jack;

[0050] 2. Moving frame; 21. Upper slide rail; 22. Lower slide rail; 23. Second vertical sliding frame; 24. Limiting component; 25. Pulley;

[0051] 3. Elastic frame; 31. Elastic component; 32. Connecting block; 33. Magnet; 34. Frame body; 35. Connecting component;

[0052] 4. Turntable; 41. Connecting bracket; 411. Set screw; 42. Outer ring; 43. Inner ring; 44. Roller; 45. Fastener;

[0053] 5. Segmental model; 51. Model fixed axis;

[0054] 6. Lifting assembly; 61. Upper pulley; 62. Lower pulley; 63. Chain; 64. Pull handle; 65. First driven wheel; 66. Second driven wheel; 67. First transmission wheel; 68. Second transmission wheel; 69. Synchronous chain. Detailed Implementation

[0055] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0061] Please refer to the following: Figures 1 to 9 This application describes the device for adjusting the vortex-induced vibration interference test model of a double-span bridge main girder. The device includes two fixed frames 1, two movable frames 2, multiple elastic frames 3, and two segmental models 5. The two fixed frames 1 are spaced apart along a first path, with their upper and lower ends respectively abutting against the wind tunnel wall. The two movable frames 2 are spaced apart along the first path, with their upper and lower ends slidably connected to the wind tunnel wall. The movable frames 2 move along a second path, which is perpendicular to the first path. The multiple elastic frames 3 are rotatably connected to the fixed frames 1 or the movable frames 2, and can slide in the vertical direction. The rotation axis of the elastic frames 3 is parallel to the first path. Each elastic frame 3 has an elastic element 31 at its upper and lower ends, and a connecting block 32 connects the two elastic elements 31. Magnets 33 with the same magnetic poles are installed on the inner sides of the connecting blocks 32 and the elastic frames 3, respectively. The two segmental models 5 are connected at both ends to the two opposite connecting blocks 32, so that the two segmental models 5 are spaced apart and parallel along the second path.

[0062] It should be noted that the fixed frame 1 serves as a stable load-bearing element, providing a solid installation foundation for the elastic frame 3. The movable frame 2 can slide along the second path, thereby changing its relative position with the fixed frame 1. The elastic frame 3 can rotate to adjust the wind attack angle of the segment model 5, and can also slide up and down to adjust the vertical position of the segment model 5. The elastic element 31 suspends the connecting block 32, providing elastic support for the vibration of the segment model 5. The repulsive force generated between the like-pole magnets 33 can limit the lateral displacement of the connecting block 32. The two segment models 5 are respectively connected to the corresponding connecting blocks 32 of the fixed frame 1 and the movable frame 2, realizing the simulated arrangement of the main beam of the double-span bridge.

[0063] It should be noted that the "Code for Wind Resistance Design of Highway Bridges" specifies that the angle of attack of strong winds in mountainous areas is within ±5°. Therefore, even when segment model 5 is tilted, the same-pole magnet 33 will not significantly affect the vertical force analysis of the elastic frame 3.

[0064] In practice, two fixed frames 1 are abutted and fixed at designated positions on the wind tunnel wall. Two movable frames 2 are then slidably installed onto the wind tunnel wall, ensuring smooth sliding along the second path. Elastic frames 3 are rotatably connected to the fixed frames 1 and movable frames 2 respectively. Elastic elements 31 are installed at the upper and lower ends inside the elastic frame 3. A connecting block 32 is connected between the two elastic elements 31, and magnets 33 of the same polarity are installed on the connecting block 32 and the inner side of the elastic frame 3. The two ends of the two segmental models 5 are connected to the corresponding connecting blocks 32, ensuring that the two segmental models 5 are spaced apart and parallel along the second path. Rotating the elastic frame 3 adjusts the wind attack angle of the segmental models 5; sliding the movable frame 2 changes the horizontal distance between the two segmental models 5; sliding the elastic frame 3 up and down adjusts the vertical distance between the two segmental models 5. After adjustment, the device is stabilized before the experiment can begin.

[0065] Optionally, the elastic element 31 can be a helical spring. Helical springs have high strength and good deformation continuity, which meets the usage requirements. Alternatively, a tower spring or a disc spring can be used, as long as it meets the usage requirements; these will not be listed here.

[0066] The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge provided in this embodiment has the following advantages compared with the prior art:

[0067] (1) The elastic frame 3 can rotate around the axis parallel to the first path, and can flexibly adjust the angle within the range of wind attack angle (±5°). During the adjustment process, the two segment models 5 can always be kept parallel through the cooperation of the connecting block 32 and the magnet 33, which greatly improves the adjustment efficiency and accuracy.

[0068] (2) By setting the same pole magnet 33 on the inner side of the connecting block 32 and the elastic frame 3, the lateral displacement of the connecting block 32 is limited by the principle of repulsion between the same poles. There is no need to use an excessively long suspension component, thus avoiding the interference of windward swaying on the test. At the same time, this method will not increase the damping of the model along the direction of the elastic element 31, thus ensuring the stability of the damping parameters in the vortex vibration test.

[0069] (3) The repulsive effect of the magnet 33 can keep the connecting block 32 always in the vertical center position of the elastic frame 3. No matter how much the elastic frame 3 rotates, the stretching direction of the elastic element 31 can remain perpendicular to the model plane. Even under the condition of strong wind angle of attack (±5°), the problem of test accuracy reduction caused by the deviation of the elastic element 31 can be effectively avoided.

[0070] (4) The two segmental models 5 are respectively mounted on two independent support structures, the fixed frame 1 and the movable frame 2. The two structures are not in direct contact, which can ensure that the dynamic characteristics of the two models are independent of each other and that the vibration of one model will not cause the other model to resonate.

[0071] (5) When adjusting the wind attack angle, horizontal spacing and vertical spacing, the length of the elastic element 31 will not change, which suppresses the damping parameter fluctuation caused by the adjustment of the length of the elastic element 31 and greatly improves the accuracy of the test results.

[0072] (6) The elastic frame 3 can slide in the up and down direction. With the limiting effect of the connecting block 32 and the magnet 33, the vertical displacement synchronization of the two segment models 5 is better during the adjustment process. Compared with the traditional method of tightening and loosening turnbuckles, the adjustment efficiency is higher and the accuracy is better.

[0073] In some embodiments, see Figures 1 to 3 The device for adjusting the test model of vortex-induced vibration interference of the main beam of the double-span bridge also includes multiple turntables 4. The multiple turntables 4 are slidably connected to the corresponding fixed frame 1 or movable frame 2 in the up and down direction. The surfaces of the multiple turntables 4 are perpendicular to the first path. The elastic frame 3 is rotatably connected to the turntables 4.

[0074] In this embodiment, the surface of the turntable 4 is perpendicular to the first path. The elastic frame 3 is rotatably connected to the turntable 4, making the rotation axis of the elastic frame 3 more precise and preventing deviation during rotation. This allows for precise angle control within the range of ±5° of the wind attack angle. The turntable 4 slides up and down along the fixed frame 1 or the movable frame 2, causing the elastic frame 3 to move synchronously. During sliding, the elastic frame 3 experiences uniform force, effectively ensuring the parallelism of the two segment models 5 during vertical adjustment and avoiding vertical spacing adjustment errors caused by sliding jams. When the turntable 4 drives the elastic frame 3 to slide, the elastic element 31 inside the elastic frame 3 will not be stretched or compressed, ensuring that the structural damping remains stable. The turntable 4 integrates both rotation and sliding functions. Operators can adjust the turntable 4 to achieve synchronous adjustment of the wind attack angle and vertical spacing. Compared to the step-by-step adjustment method of traditional devices, this saves a significant amount of operation time and improves experimental efficiency.

[0075] In some embodiments, see Figure 2 , Figure 3 and Figure 6 Both the movable frame 2 and the fixed frame 1 are rectangular frames. The turntable 4 includes a connecting frame 41, an outer ring 42, an inner ring 43, and multiple rollers 44. The connecting frame 41 has set screw holes 411 on both sides, and set screws 411 are provided in the set screw holes. The set screws 411 can be pressed against the inner side of the fixed frame 1 or the inner side of the movable frame 2 to limit the displacement of the connecting frame 41 in the vertical direction. The outer ring 42 is installed inside the connecting frame 41. The inner ring 43 is rotatably installed inside the outer ring 42, and the axis of rotation is parallel to the first path. The inner ring 43 is connected to the elastic frame 3. Multiple rollers 44 are symmetrically arranged on the outer periphery of the connecting frame 41, and the rollers 44 roll in cooperation with the inner side of the fixed frame 1 or the inner side of the movable frame 2.

[0076] The rollers 44 provided in this embodiment roll into contact with the inner side of the fixed frame 1 or the movable frame 2, converting sliding friction into rolling friction, significantly reducing sliding resistance. Operators can easily adjust the vertical position of the elastic frame 3, saving time and effort. The rolling contact method also reduces component wear and extends the device's service life. Once the turntable 4 slides to the target vertical position, tightening the set screw 411 firmly fixes the connecting frame 41 to the fixed frame 1 or the movable frame 2, preventing displacement of the turntable 4 during the test and ensuring the stability of the segment model 5's vertical position. The rotation axis of the inner ring 43 is parallel to the first path, preventing skew during rotation and enabling precise angle adjustment within the high wind angle range, ensuring the two segment models 5 remain parallel. The sliding and rotation of the turntable 4 do not change the tensile length of the elastic element 31 inside the elastic frame 3, ensuring constant structural damping and significantly improving the reliability of the vortex-induced vibration test results.

[0077] In some embodiments, see Figure 1The turntable 4 moves up and down via a lifting assembly 6, which includes an upper pulley 61, a lower pulley 62, and a chain 63. The upper pulley 61 is installed on the inner top of the movable frame 2 or the fixed frame 1; the lower pulley 62 is installed on the inner bottom of the movable frame 2 or the fixed frame 1; the chain 63 is wound around the upper pulley 61 and the lower pulley 62 respectively, and both ends are connected to the ends of the turntable 4. The chain 63 is provided with a pull handle 64, which drives the chain 63 to slide, thereby driving the turntable 4 to move up and down; wherein, the two lower pulleys 62 in the movable frame 2 are connected by a transmission, and the two lower pulleys 62 in the fixed frame 1 are also connected by a transmission.

[0078] In this embodiment, the combination of the pull handle 64 and the pulley system allows the operator to raise and lower the turntable 4 with only a small pulling force, making operation more convenient and saving test preparation time. When the lifting assembly 6 drives the turntable 4 to slide, the elastic element 31 inside the elastic frame 3 will not be stretched or compressed, and the structural damping remains constant, enhancing the structural stability of the device. The connection between the pulley system and the chain 63 is firm and reliable, and there will be no loosening or slippage during the test, which can effectively suppress the downwind swaying of the segment model 5 and avoid resonance transmission between the main beam models of the double-span bridge.

[0079] In practice, the two sliding wheels 62 in the movable frame 2 are connected by a transmission, and the two sliding wheels 62 in the fixed frame 1 are also connected by a transmission. When the pull handle 64 is pulled, the chain 63 drives the two turntables 4 to move up and down synchronously, so that the vertical displacements at both ends of the elastic frame 3 are approximately the same, saving the time of manual adjustment of the two elastic frames 3, speeding up the adjustment efficiency, and thus keeping the segment model 5 in a horizontal state at all times.

[0080] As one embodiment of the transmission connection between the two sliding pulleys 62, see [reference]. Figure 8 and Figure 9 The lifting assembly 6 also includes a first driven wheel 65 and a second driven wheel 66. The first driven wheel 65 is coaxially connected to one of the lower pulleys 62 and rotates synchronously. The second driven wheel 66 is mounted on another fixed frame 1. The first driven wheel 65 and the second driven wheel 66 rotate synchronously through a synchronous chain 69. A first transmission wheel 67 is coaxially mounted on the second driven wheel 66, and the second driven wheel 66 rotates synchronously with the first transmission wheel 67. A second transmission wheel 68 is coaxially mounted on the lower pulley 62 corresponding to the second driven wheel 66, and this lower pulley 62 rotates synchronously with the second transmission wheel 68. The first transmission wheel 67 and the second transmission wheel 68 mesh so that the rotation directions of the two lower pulleys 62 are opposite, thereby enabling the two elastic frames 3 to rise or fall synchronously.

[0081] It should be noted that, Figure 8 and Figure 9This is a schematic diagram demonstrating the installation of the sliding wheel 62 on the movable frame 2. When the sliding wheel 62 is installed on the fixed frame 1, the assembly structure and principle are the same as those when the sliding wheel 62 is installed on the movable frame 2.

[0082] In some embodiments, see Figure 2 The fixed frame 1 includes a first vertical sliding frame 11 and a jack 12. The first vertical sliding frame 11 is a rectangular frame, and the elastic frame 3 is slidably disposed on the inner side of the first vertical sliding frame 11. The top of the first vertical sliding frame 11 is connected to the top of the wind tunnel. The jack 12 is installed at the bottom end of the first vertical sliding frame 11 and is placed at the bottom of the wind tunnel.

[0083] In practice, the jack 12 can lift the first vertical sliding frame 11 from below, so that the top of the first vertical sliding frame 11 is tightly pressed against the top of the wind tunnel.

[0084] In this embodiment, by adjusting the jack 12, the first vertical sliding frame 11 can be abutted between the top and bottom of the wind tunnel, ensuring that the fixed frame 1 will not shift or shake during the test, providing a stable support foundation for the elastic frame 3 and the segmental model 5. The elastic frame 3 slides along the inner side of the first vertical sliding frame 11, and the sliding trajectory is more stable, ensuring the parallel state of the segmental model 5 during vertical adjustment. The fixed frame 1 is rigidly connected to the wind tunnel wall through the jack 12, forming two completely independent support systems with the moving frame 2. The two systems have no direct contact, which can effectively eliminate the resonance transmission between the two bridge main beam models and ensure that the dynamic characteristics of the two segmental models 5 are independent of each other. The height adjustment of the jack 12 is flexible and can adapt to wind tunnel test environments at different heights, reducing the difficulty of test preparation.

[0085] In some embodiments, see Figure 3 The movable frame 2 includes an upper slide rail 21, a lower slide rail 22, and a second vertical sliding frame 23. The upper slide rail 21 is installed at the top of the wind tunnel and extends along the second path; the lower slide rail 22 is installed at the bottom of the wind tunnel and extends along the second path; the second vertical sliding frame 23 is a rectangular frame, and an elastic frame 3 is slidably disposed inside the second vertical sliding frame 23. The upper and lower ends of the second vertical sliding frame 23 are slidably connected to the upper slide rail 21 and the lower slide rail 22, respectively.

[0086] The upper slide rail 21 and lower slide rail 22 provided in this embodiment provide precise sliding guidance for the second vertical sliding frame 23. The second vertical sliding frame 23 slides along the second path, precisely controlling the relative position between the moving frame 2 and the fixed frame 1, thereby achieving precise adjustment of the horizontal spacing between the two segment models 5. The second vertical sliding frame 23 enhances the structural rigidity of the device, providing stable support for the elastic frame 3 and improving the stability of the test results. When sliding the second vertical sliding frame 23, the length of the elastic element 31 inside the elastic frame 3 does not change, the structural damping remains constant, and the rotation angle of the elastic frame 3 is not affected. This allows for the adjustment of the horizontal spacing while maintaining the stability of the wind attack angle and the vertical spacing, significantly improving test efficiency.

[0087] In some embodiments, see Figure 4 The upper and lower ends of the second vertical sliding frame 23 are respectively equipped with pulleys 25, which roll in cooperation with the upper slide rail 21 or the lower slide rail 22. The upper and lower ends of the second vertical sliding frame 23 are also provided with vertically arranged limiting holes, and the limiting holes have limiting members 24. The limiting members 24 can abut against the lower slide rail 22 or the upper slide rail 21 to limit the displacement of the second vertical sliding frame 23 on the second path.

[0088] In practice, the limiting component 24 can be either a set screw or a bolt.

[0089] In this embodiment, pulley 25 rolls in conjunction with the upper slide rail 21 and the lower slide rail 22, significantly reducing sliding resistance. Operators can easily push the second vertical sliding frame 23 to adjust the horizontal spacing. Once the second vertical sliding frame 23 reaches the target position, the limiting member 24 is inserted into the limiting hole and abuts against the upper slide rail 21 or the lower slide rail 22, firmly fixing the position of the second vertical sliding frame 23. This prevents changes in the horizontal spacing due to airflow interference during the test, enhancing the structural stability of the device. When sliding the second vertical sliding frame 23, the length of the elastic member 31 inside the elastic frame 3 remains unchanged, and the structural damping remains constant. Simultaneously, the rotation angle of the elastic frame 3 is not affected, maintaining the stability of the wind attack angle and vertical spacing while adjusting the horizontal spacing.

[0090] In some embodiments, see Figure 5 The elastic frame 3 also includes a frame body 34, which is installed on the end face of the inner ring 43. Connectors 35 are installed at the upper and lower ends of the frame body 34, and the connectors 35 are connected to the corresponding elastic members 31. Magnets 33 are installed on the side wall of the connecting block 32 and the side wall of the frame body 34, so that the connecting block 32 is located on the vertical center line of the frame body 34.

[0091] In practice, the connector 35 uses turnbuckles.

[0092] In this embodiment, the connector 35 stably fixes the elastic element 31 to the upper and lower ends inside the frame body 34, preventing the elastic element 31 from falling off or shifting during the test, thus ensuring the stability of the elastic support. The connecting block 32 and the same-pole magnet 33 on the side wall of the frame body 34 repel each other, ensuring that the connecting block 32 always remains on the vertical centerline of the frame body 34. This ensures that the tensile direction of the elastic element 31 is always perpendicular to the plane of the segment model 5, effectively avoiding the problem of decreased test accuracy caused by the directional deviation of the elastic element 31, even under high wind angle of attack conditions. The repulsive effect of the magnet 33 restricts the lateral displacement of the connecting block 32, suppressing the downwind swaying of the segment model 5. At the same time, this method does not increase the damping of the segment model 5 along the direction of the elastic element 31, and the length of the elastic element 31 does not change during adjustment, ensuring that the structural damping remains constant.

[0093] In some embodiments, see Figure 5 The segmental model 5 has a model fixing shaft 51 at its end, which passes through the connecting block 32. The model fixing shaft 51 effectively prevents the segmental model 5 from falling off or shifting during the test, ensuring its stability during vibration. Operators only need to insert or remove the model fixing shaft 51 from the connecting block 32 to complete the installation or removal of the segmental model 5, improving test preparation efficiency. The installation method of the model fixing shaft 51 does not change the tensile length of the elastic element 31, nor does it add additional damping, ensuring that the structural damping remains constant. The design of the model fixing shaft 51 is suitable for segmental models 5 of different specifications. By simply replacing the model fixing shaft 51 with a different size, the requirements of various double-span bridge main girder vortex-induced vibration tests can be met, expanding the applicability of the device.

[0094] In some embodiments, see Figure 7 The inner ring 43 has multiple locking holes along its radial direction on its outer periphery, and the outer ring 42 has positioning holes on its inner ring wall corresponding to the locking holes. The inner ring 43 and the outer ring 42 are relatively fixed by fasteners 45, which pass through the locking holes and are inserted into the positioning holes.

[0095] In this embodiment, multiple locking holes are radially formed on the outer periphery of the inner ring 43. Different locking holes can be selected to cooperate with the positioning holes of the outer ring 42 according to the test requirements, so as to achieve precise adjustment of different wind attack angles. Especially in the range of large wind attack angles, it can meet the test requirements of various working conditions. Fasteners 45 pass through the locking holes and are inserted into the positioning holes to firmly fix the inner ring 43 and the outer ring 42, preventing changes in the wind attack angle due to airflow interference during the test. This enhances the anti-interference capability of the device. The robust locking structure can effectively suppress the downwind swaying of the segment model 5, while avoiding the resonance transmission between the two bridge main beam models, thus improving the stability of the test process.

[0096] It should be noted that multiple fasteners 45 can be set; the diagram shown is for illustrative purposes only.

[0097] As another way of matching the inner ring 43 and the outer ring 42, the end face of the inner ring 43 facing away from the elastic frame 3 has a connecting protrusion ring with a first hole. The outer ring 42 has a second hole corresponding to the first hole. The inner ring 43 and the outer ring 42 are installed together by bolts that pass through both the first hole and the second hole. In use, multiple first holes and multiple second holes are provided, so that the connecting protrusion ring can drive the inner ring 43 to freely adjust the angle and fix it.

[0098] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for adjusting a test model of vortex-induced vibration interference of a double-span bridge main girder, characterized in that, include: Two fixed frames (1) are set at intervals along the first path, and their upper and lower ends abut against the wind tunnel wall respectively; Two movable frames (2) are spaced apart along a first path and are slidably connected to the wind tunnel wall at their upper and lower ends respectively. The movable frames (2) move along a second path, which is perpendicular to the first path. Multiple elastic frames (3) are rotatably connected to the fixed frame (1) or the movable frame (2) respectively, and can slide in the up and down direction. The rotation axis of the elastic frame (3) is parallel to the first path. The upper and lower ends of the elastic frame (3) are respectively provided with elastic elements (31), and a connecting block (32) is connected between two elastic elements (31). The connecting block (32) and the inner side of the elastic frame (3) are respectively equipped with magnets (33) with the same magnetic poles. Two segment models (5) are connected at both ends to two opposite connecting blocks (32) so that the two segment models (5) are spaced apart and parallel along the second path. The two segment models (5) are respectively mounted on a fixed frame (1) and a movable frame (2). The two fixed frames (1) and the two movable frames (2) have no direct contact. as well as Multiple turntables (4) are slidably connected to the corresponding fixed frame (1) or the movable frame (2) in the up and down direction, and the surfaces of the multiple turntables (4) are perpendicular to the first path. The elastic frame (3) is rotatably connected to the turntables (4). Both the movable frame (2) and the fixed frame (1) are rectangular frames, and the turntable (4) includes: The connecting frame (41) has set screw (411) holes on both sides. The set screw (411) holes have set screws (411) inside. The set screws (411) can be pressed against the inner side of the fixed frame (1) or the inner side of the movable frame (2) to limit the displacement of the connecting frame (41) in the vertical direction. The outer ring (42) is installed inside the connecting frame (41); An inner ring (43) is rotatably mounted inside the outer ring (42), with its rotation axis parallel to the first path. The inner ring (43) is connected to the elastic frame (3). Multiple rollers (44) are symmetrically arranged on the outer periphery of the connecting frame (41), and the rollers (44) roll in cooperation with the inner side of the fixed frame (1) or the inner side of the movable frame (2). The elastic frame (3) also includes: The frame body (34) is installed on the end face of the inner ring (43). Connectors (35) are installed at the upper and lower ends of the frame body (34). The connectors (35) are connected to the corresponding elastic members (31). The connecting block (32) and the side wall of the frame body (34) are respectively equipped with magnets (33) so that the connecting block (32) is located on the vertical center line of the frame body (34).

2. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 1, characterized in that, The turntable (4) moves up and down via a lifting assembly (6), the lifting assembly (6) comprising: The upper pulley (61) is installed on the inner top of the movable frame (2) or the fixed frame (1); A sliding wheel (62) is installed at the inner bottom of the movable frame (2) or the fixed frame (1); and A chain (63) is wound around the upper pulley (61) and the lower pulley (62) respectively, and both ends are connected to the ends of the turntable (4). A pull handle (64) is provided on the chain (63). The pull handle (64) drives the chain (63) to slide, so as to drive the turntable (4) to move up and down. The two sliding wheels (62) in the movable frame (2) are connected by a transmission, and the two sliding wheels (62) in the fixed frame (1) are also connected by a transmission.

3. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 1, characterized in that, The fixed frame (1) includes: The first vertical sliding frame (11) is a rectangular frame, and the elastic frame (3) is slidably disposed on the inner side of the first vertical sliding frame (11). The top of the first vertical sliding frame (11) is connected to the top of the wind tunnel; and A jack (12) is installed at the bottom of the first vertical sliding frame (11) and the jack (12) is placed at the bottom of the wind tunnel.

4. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 1, characterized in that, The mobile frame (2) includes: The upper slide rail (21) is installed on the top of the wind tunnel and extends along the second path; A sliding rail (22) is installed at the bottom of the wind tunnel and extends along the second path; and The second vertical sliding frame (23) is a rectangular frame. The elastic frame (3) is slidably disposed on the inner side of the second vertical sliding frame (23). The upper and lower ends of the second vertical sliding frame (23) are slidably connected to the upper slide rail (21) and the lower slide rail (22) respectively.

5. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 4, characterized in that, The upper and lower ends of the second vertical sliding frame (23) are respectively equipped with pulleys (25), and the pulleys (25) are in rolling cooperation with the upper slide rail (21) or the lower slide rail (22); The second vertical sliding frame (23) is provided with vertically arranged limiting holes at its upper and lower ends. The limiting holes have limiting members (24) that can abut against the lower slide rail (22) or the upper slide rail (21) to limit the displacement of the second vertical sliding frame (23) on the second path.

6. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 1, characterized in that, The end of the segment model (5) is provided with a model fixing shaft (51), which passes through the connecting block (32).

7. The device for adjusting the test model of vortex-induced vibration interference of the main girder of a double-span bridge as described in claim 1, characterized in that, The inner ring (43) has multiple locking holes along its radial direction on its outer periphery. The outer ring (42) has positioning holes on its inner ring wall corresponding to the locking holes. The inner ring (43) and the outer ring (42) are relatively fixed by fasteners (45). The fasteners (45) pass through the locking holes and are inserted into the positioning holes.

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