Wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridge

Abstract

The invention discloses a wind tunnel test device for separation and coupling of vertical bending and torsion modes of a bridge, and belongs to the technical field of bridge wind tunnel tests, the wind tunnel test device comprises support frames mounted on two sides of a bridge segment model, guide rods are arranged on the support frames, and a support seat is slidably mounted on the guide rods; a connecting rod fixedly connected with a bridge segment model is rotatably installed on the supporting base, two supporting cross rods are arranged on the supporting frame, a suspension arm located between the two supporting cross rods is fixedly connected to the connecting rod, an elastic assembly is installed between the suspension arm and the supporting cross rods, and a limiting block fixedly connected with the connecting rod is rotatably installed on the supporting base. Two limiting plates are installed on the guide rod in a sliding mode, sliding blocks are installed on the limiting plates in a sliding mode, the two sliding blocks are connected to opposite threads of the two-way screw in a threaded mode, grooves are formed in the limiting blocks, and a driving part capable of sliding along the grooves is fixedly installed on the two-way screw. The vertical bending mode and the torsion mode can be locked or unlocked by rotating or sliding the driving part.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge wind tunnel tests, and in particular relates to a wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges. Background Art

[0002] For bridges with large spans, low stiffness and other structures that are easily affected by wind loads, wind tunnel testing is an important part of bridge design and safety assessment. Wind tunnel testing can simulate the generation of wind loads and act on the test model to obtain the response of the model, reflecting the response and vibration characteristics of the actual bridge under wind loads. Wind tunnel testing can be used to evaluate the performance of the bridge design to ensure that the structure can withstand the designed wind load and meet the relevant design standards and specifications. Bridge wind tunnel test types can be divided into segment tests and full-bridge aeroelastic tests. The present invention provides a test model and test method for wind tunnel experiments on bridge segment models. The segment model is usually a scaled model that reflects a certain modal dynamic characteristic of the bridge. The design of the segment model needs to consider maintaining similarity to the aerodynamic shape and modal dynamic characteristics of the actual structure to ensure the accuracy and reliability of the test results.

[0003] Under the action of wind load, the bridge mainly experiences vertical bending and torsional vibration deformation. Studying the characteristics of vertical bending, torsional independent vibration and vertical bending and torsional coupled vibration of the bridge under wind load is of great significance to improving the wind resistance of the bridge and ensuring the safety and reliability of the bridge during operation. There is a coupling effect between the vertical bending mode and the torsional mode of the bridge, which will affect each other. That is, when the main beam of the bridge vibrates, there are often both vertical bending vibration modes and torsional vibration modes. This coupling effect has an important influence on the dynamic response and vibration characteristics of the bridge structure, and the influence is more significant under high wind speed wind load. The current wind tunnel test model generally adopts the coupling form of structural vertical bending and torsional modes, or separates the vertical bending and torsional modes of the model by adjusting the spring stiffness of the model and the additional mass. It is impossible to achieve completely independent vibration of vertical bending or torsional, but can only reduce the mutual influence between them. However, for some specific engineering needs or some refined mechanism research work, when designing the segment model, more attention may be paid to the independent vibration analysis of vertical bending or torsional vibration, or a comprehensive analysis of the influencing mechanisms of independent vibration and coupled vibration. This requires further development and improvement of the current segment model wind tunnel test technology.

[0004] Aiming at the comprehensive analysis demand of independent vibration and coupled vibration of vertical bending and torsional vibration of bridge under wind load, the present invention proposes a bridge vertical bending and torsional modal separation and coupling segment model for wind tunnel test. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a wind tunnel test device for separation and coupling of vertical bending and torsional modes of a bridge, so as to analyze the independent vibration and coupled vibration of vertical bending and torsional of the bridge under wind load.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges, comprising a support frame installed on opposite sides of the length direction of a bridge segment model, the support frame being fixedly installed with at least two vertically arranged guide rods away from the bridge segment model side, a support seat being slidably installed on the guide rod, a connecting rod being rotatably installed on the support seat, the connecting rod being fixedly connected to the bridge segment model, two supporting cross bars being symmetrically arranged about a central cross section of the bridge segment model being fixedly installed on the support frame close to the bridge segment model side, a suspension arm being fixedly connected to the connecting rod and being located between the two supporting cross bars, and the suspension arm and the supporting cross bar being connected to the connecting rod. An elastic component is installed between the two, and a limit block is installed on the support seat to be rotated away from the side of the bridge segment model. The limit block is fixedly connected to the connecting rod, and two limit plates symmetrically arranged about the central cross-section of the support seat are slidably installed on the guide rod. The limit plate is provided with a strip slide groove arranged along the length direction of the bridge segment model, and a slider is installed in the strip slide groove for limited sliding. The two sliders are threadedly connected to the opposite threads of the bidirectional screw, and the limit block is provided with a groove arranged in the vertical direction. A driving part capable of vertical limited sliding along the groove is fixedly installed on the bidirectional screw, and sliding the slider along the strip slide groove can connect or disconnect the driving part with the groove.

[0008] Furthermore, sliding grooves are provided on the side walls opposite to the support cross bar and the boom, and two elastic components symmetrically arranged about the connecting rod axis are installed between the support cross bar and the boom, and the elastic components include a connecting block slidably installed in the sliding groove, and a spring in a stretched state is fixedly connected between the two oppositely arranged connecting blocks.

[0009] Furthermore, a plurality of sockets connected to the slide slot are arranged side by side on the support cross bar and the boom along the extension direction of the slide slot. The sockets arranged on the support cross bar correspond one to one with the sockets arranged on the boom, and a plug rod matching the sockets is inserted on the connecting block.

[0010] Furthermore, the slide grooves on both sides of the supporting cross bar are connected, and the connecting blocks on both sides of the supporting cross bar are fixedly connected.

[0011] Furthermore, a rolling bearing is fixedly mounted on the support seat, and the connecting rod is fixedly connected to the inner ring of the rolling bearing.

[0012] Furthermore, the support seat and the guide rod are connected via a sliding bearing.

[0013] Furthermore, the limit block is arranged in a circular shape, and a plurality of grooves extending radially along the limit block are arranged on the limit block at equal angle intervals with the axis of the limit block as the center.

[0014] Furthermore, during the wind tunnel test, it includes a state in which the vertical bending mode and the torsional mode are separated and a state in which the vertical bending mode and the torsional mode are coupled. In the state in which the vertical bending mode and the torsional mode are separated, the vertical bending mode is locked and the torsional mode is unlocked, or the vertical bending mode is unlocked and the torsional mode is locked; in the state in which the vertical bending mode and the torsional mode are coupled, both the vertical bending mode and the torsional mode are unlocked.

[0015] Furthermore, during the wind tunnel test, the bridge segment model is adjusted so that one of the multiple grooves extends in the vertical direction; the driving part is rotated to rotate the bidirectional screw to move the two sliders toward or away from the support seat, thereby moving the limit plate toward or away from the support seat, so that the limit plate and the support seat are abutted against or a gap is provided, thereby locking or unlocking the vertical bending mode; the slider is slid along the strip slide groove toward or away from the limit block, so that the driving part is connected or disconnected from the groove, thereby locking or unlocking the torsional mode.

[0016] The beneficial effects of the present invention are:

[0017] The present invention can realize locking and unlocking of the vertical bending state by rotating the driving part, and can realize locking and unlocking of the torsion mode by connecting or disengaging the sliding driving part with the groove, thereby realizing separation and coupling of the vertical bending mode and the torsion mode.

[0018] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0020] Figure 1 It is a schematic diagram of the overall structure of a wind tunnel test device according to an embodiment of the present invention;

[0021] Figure 2 A side view of a wind tunnel test device according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the installation of a support base according to an embodiment of the present invention.

[0023] The markings in the accompanying drawings are as follows: bridge segment model 1, supporting frame 2, guide rod 201, supporting cross bar 202, supporting seat 3, connecting rod 4, boom 5, elastic component 6, connecting block 601, spring 602, limit block 7, groove 701, limit plate 8, strip slide 801, slider 802, bidirectional screw 9, driving part 901, slide 10, socket 11, and plug rod 12. DETAILED DESCRIPTION

[0024] like Figures 1 to 3 As shown, the present invention provides a wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges, comprising: a support frame 2 installed on opposite sides of the length direction of a bridge segment model 1, the support frame 2 is fixedly installed with at least two vertically arranged guide rods 201 on the side away from the bridge segment model 1, a support seat 3 is slidably installed on the guide rod 201, a connecting rod 4 is rotatably installed on the support seat 3, the connecting rod 4 is fixedly connected to the bridge segment model 1, two supporting cross bars 202 symmetrically arranged about the central cross section of the bridge segment model 1 are fixedly installed on the support frame 2 close to the bridge segment model 1, a suspension arm 5 located between the two supporting cross bars 202 is fixedly connected to the connecting rod 4, and an elastic group is installed between the suspension arm 5 and the supporting cross bar 202. Part 6, the support seat 3 is rotatably installed with a limit block 7 away from the side of the bridge segment model 1, the limit block 7 is fixedly connected to the connecting rod 4, and two limit plates 8 symmetrically arranged about the central cross-section of the support seat 3 are slidably installed on the guide rod 201, and the limit plate 8 is provided with a strip slide groove 801 arranged along the length direction of the bridge segment model 1, and a slider 802 is installed in the strip slide groove 801 for limiting sliding. The two sliders 802 are threadedly connected to the opposite threads of the bidirectional screw 9, and the limit block 7 is provided with a groove 701 arranged along the vertical direction, and a driving part 901 capable of vertical limited sliding along the groove 701 is fixedly installed on the bidirectional screw 9, and sliding the slider 802 along the strip slide groove 801 can connect or disconnect the driving part 901 with the groove 701.

[0025] In this scheme, three tests can be implemented, among which,

[0026] Test 1, coupled vibration of vertical bending mode and torsional mode, vertical bending mode unlocking: rotating the driving part 901 to rotate the bidirectional screw 9 so that the two sliders 802 move away from the support seat 3, thereby driving the limit plate 8 to move away from the support seat 3, so that a limited gap is set between the limit plate 8 and the support seat 3; torsional mode unlocking: sliding the slider 802 along the strip slide groove 801 in the direction away from the limit block 7 to disengage the driving part 901 from the groove 701; during the test, the bridge segment model 1 is fixedly connected to the support seat 3 through the connecting rod 4. When the bridge segment model 1 is in the vertical bending mode, the support seat 3 can slide back and forth in the limit gap. When the bridge segment model 1 is in the torsional mode, the bridge segment model 1, the connecting rod 4 and the limit block 7 can realize reciprocating rotation.

[0027] Test 2, independent vibration of vertical bending mode, vertical bending mode unlocking: rotating the driving part 901 to rotate the bidirectional screw 9 so that the two sliders 802 move away from the support seat 3, thereby driving the limit plate 8 to move away from the support seat 3, so that a limited gap is set between the limit plate 8 and the support seat 3; torsional mode locking: sliding the slider 802 along the strip slide groove 801 in the direction close to the limit block 7, so that the driving part 901 cooperates with the groove 701, and the driving part 901 can slide vertically along the groove 701; in the experiment, the bridge segment model 1 is fixedly connected to the support seat 3 by the connecting rod 4. When the bridge segment model 1 is in the vertical bending mode, the support seat 3 can slide back and forth in the limit gap. Due to the limitation of the limit block 7 by the driving part 901, the bridge segment model 1 cannot rotate.

[0028] Test three, independent vibration of torsional mode, vertical bending mode locking: rotating the driving part 901 to rotate the bidirectional screw 9 so that the two sliders 802 move toward the support seat 3, thereby driving the limit plate 8 to move toward the support seat 3, until the limit plates 8 on both sides of the support seat 3 are against the support seat 3; torsional mode unlocking: sliding the slider 802 along the strip groove 801 in the direction away from the limit block 7, so that the driving part 901 is out of the groove 701; during the test, the limit plates 8 on both sides of the support seat 3 are limited and cannot move vertically, and the limit block 7 can rotate due to the loss of the limit of the driving part 901.

[0029] This solution can achieve locking and unlocking of the vertical bending state by rotating the driving part 901, and can achieve locking and unlocking of the torsional mode by connecting or disconnecting the sliding driving part 901 with the groove 701, thereby achieving separation and coupling of the vertical bending mode and the torsional mode.

[0030] In one embodiment of the present invention, a slide groove 10 is provided on the side wall opposite to the support cross bar 202 and the boom 5, and two elastic components 6 symmetrically arranged about the axis of the connecting rod 4 are installed between the support cross bar 202 and the boom 5. The elastic component 6 includes a connecting block 601 slidably installed in the slide groove 10, and a spring 602 in a stretched state is fixedly connected between the two oppositely arranged connecting blocks 601.

[0031] In the present solution, by setting two groups of elastic components 6 symmetrical about the axis of the connecting rod 4, the boom 5 can vibrate back and forth in the vertical bending mode, and the vertical bending frequency can be adjusted by replacing springs 602 with different stiffnesses; in the torsion mode, the torsion frequency can be adjusted by sliding the connecting block 601 along the slide groove 10 to change the distance between the two groups of elastic components 6; and the spring 602 is always in a stretched state, which can ensure that the spring 602 is always in axial deformation in the vertical bending mode and the torsion mode to avoid bending deformation of the spring 602.

[0032] In one embodiment of the present invention, a plurality of sockets 11 connected to the slide slot 10 are arranged side by side on the support cross bar 202 and the boom 5 along the extension direction of the slide slot 10. The sockets 11 arranged on the support cross bar 202 correspond one-to-one to the sockets 11 arranged on the boom 5. A plug rod 12 cooperating with the sockets 11 is plugged into the connecting block 601. After the connecting block 601 is slid to a preset position, the plug rod 12 is inserted into the socket 11 and plugged into the connecting block 601 to fix the position of the connecting block 601, thereby ensuring the stable deformation of the spring 602 in the vertical bending mode and the torsional mode.

[0033] In one embodiment of the present invention, the slide grooves 10 on both sides of the supporting cross bar 202 are connected, and the connecting blocks 601 on both sides of the supporting cross bar 202 are fixedly connected to facilitate the overall sliding of the elastic component 6.

[0034] In one embodiment of the present invention, the limit block 7 is configured to be circular, and a plurality of grooves 701 extending radially along the limit block 7 are provided on the limit block 7 at equal angle intervals with the axis of the limit block 7 as the center.

[0035] In this solution, by setting a plurality of grooves 701, the limit block 7 can be rotated to make one of the plurality of grooves 701 in a vertical state, so that the bridge stage model 1 is rotated to a corresponding angle, and vertical bending and torsion tests can be performed on the bridge stage model 1 when the bridge segment model 1 is in an inclined state and a horizontal state.

[0036] In one embodiment of the present invention, a rolling bearing (not shown in the figure) is fixedly mounted on the support seat 3, and the connecting rod 4 is fixedly connected to the inner ring of the rolling bearing to reduce the friction of the connecting rod 4 in the torsional mode.

[0037] In one embodiment of the present invention, the support seat 3 is connected to the guide rod 201 via a sliding bearing (not shown in the figure) to reduce the friction on the guide rod 201 in the vertical bending mode.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A wind tunnel test device for separation and coupling of vertical bending and torsion modes of a bridge, comprising support frames installed on opposite sides of the length direction of a bridge segment model, characterized in that: The support frame is fixedly installed with at least two vertically arranged guide rods away from the bridge segment model side, and a support seat is slidably installed on the guide rod, and a connecting rod is rotatably installed on the support seat, and the connecting rod is fixedly connected to the bridge segment model; the support frame is fixedly installed with two supporting cross bars symmetrically arranged about the central cross section of the bridge segment model on the side close to the bridge segment model, and a hanging arm located between the two supporting cross bars is fixedly connected to the connecting rod, and an elastic component is installed between the hanging arm and the supporting cross bar; the support seat is rotatably installed with a limiting block away from the bridge segment model side, and the limiting block is fixedly connected to the connecting rod; two limiting plates symmetrically arranged about the central cross section of the support seat are slidably installed on the guide rod, and the limiting plate is provided with a strip slide groove arranged along the length direction of the bridge segment model, and a slider is limitedly installed in the strip slide groove for sliding, and the two sliders are threadedly connected to the opposite threads of the bidirectional screw, and the limiting block is provided with a groove arranged in the vertical direction, and a driving part capable of vertical limited sliding along the groove is fixedly installed on the bidirectional screw, and sliding the slider along the strip slide groove can connect or disengage the driving part from the groove.

2. The wind tunnel test device for separation and coupling of vertical bending and torsional modes of bridges according to claim 1, characterized in that: The side walls opposite to the support cross bar and the boom are both provided with sliding grooves, and two elastic components symmetrically arranged about the connecting rod axis are installed between the support cross bar and the boom, and the elastic components include a connecting block slidably installed in the sliding groove, and a spring in a stretched state is fixedly connected between the two oppositely arranged connecting blocks.

3. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 2 is characterized in that: The supporting cross bar and the boom are provided with a plurality of sockets connected to the slide slot in parallel along the extension direction of the slide slot. The sockets provided on the supporting cross bar correspond to the sockets provided on the boom one by one, and the connecting block is provided with a plug rod matching the sockets.

4. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 3 is characterized in that: The slide grooves on both sides of the supporting cross bar are connected, and the connecting blocks on both sides of the supporting cross bar are fixedly connected.

5. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 4, characterized in that: A rolling bearing is fixedly mounted on the support seat, and the connecting rod is fixedly connected to the inner ring of the rolling bearing.

6. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 5 is characterized in that: The support seat and the guide rod are connected via a sliding bearing.

7. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 6 is characterized in that: The limit block is arranged in a circular shape, and a plurality of grooves extending in the radial direction of the limit block are arranged on the limit block at equal angle intervals with the axis of the limit block as the center.

8. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 7 is characterized in that: During the wind tunnel test, it includes a vertical bending mode and a torsional mode separation state and a vertical bending mode and a torsional mode coupling state. In the vertical bending mode and torsional mode separation state, the vertical bending mode is locked and the torsional mode is unlocked, or the vertical bending mode is unlocked and the torsional mode is locked; in the vertical bending mode and torsional mode coupling state, both the vertical bending mode and the torsional mode are unlocked.

9. The wind tunnel test device for separation and coupling of vertical bending and torsion modes of bridges according to claim 8, characterized in that: During the wind tunnel test, the bridge segment model is adjusted so that one of the multiple grooves extends in the vertical direction; the driving part is rotated to rotate the bidirectional screw to move the two sliders toward or away from the support seat, thereby moving the limit plate toward or away from the support seat, so that the limit plate and the support seat are abutted against or a gap is provided, thereby locking or unlocking the vertical bending mode; the slider is slid along the strip slide groove toward or away from the limit block, so that the driving part is connected or disconnected from the groove, thereby locking or unlocking the torsion mode.

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