A double-amplitude bridge testing device considering forced vibration and disturbance effect

Abstract

The application discloses a kind of double-width bridge test device considering forced vibration and interference effect, belong to bridge experimental technical field, including symmetrically being arranged in wind tunnel support frame, support frame between being provided with test model, the end of test model is provided with end plate, and the upper and lower sides of both ends of end plate are vertically provided with suspension spring connected with support frame;Opposite faces of support frame are all provided with guide rail that is horizontal and perpendicular to test model, and the mounting seat is slidably connected on guide rail, and mounting seat and guide rail are locked by fastening bolt;Vibration model parallel to test model is provided between mounting seat, and vibration equipment for making forced vibration model vibrate is provided on mounting seat;Laser displacement sensor for detecting vibration of vibration model and test model is provided on support frame, and pressure scanning valve is further provided on support frame;The purpose of the application is to solve the problem that existing device is not suitable for forced vibration and interference effect test of double-width bridge.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge experiments, and particularly relates to a double-width bridge test device considering forced vibration and interference effect. BACKGROUND

[0002] With the continuous increase of the size of modern bridges, the problem of wind-induced vibration is becoming more and more important. Among them, the double-width bridge has a wide overall width, stable structure and large traffic capacity, and has been widely used in practical engineering. However, there is a significant aerodynamic interference phenomenon between the two box girder sections of the double-width bridge, and the aerodynamic parameters are quite different from those of the single-width bridge. At the same time, when forced vibration occurs under external influence, interference effect will also be triggered, resulting in more complex interference effect of the double-width bridge. However, the existing interference effect test device is only suitable for single-width bridges and cannot be applied to double-width bridges. Therefore, a test device for forced vibration and interference effect of double-width bridges is needed. SUMMARY

[0003] Therefore, the application discloses a double-width bridge test device considering forced vibration and interference effect, which aims to solve the problem that the existing device is not suitable for forced vibration and interference effect test of double-width bridges.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme.

[0005] A double-width bridge test device considering forced vibration and interference effect, comprising support frames symmetrically arranged in a wind tunnel, a test model arranged between the support frames, end plates arranged at the ends of the test model, suspension springs vertically arranged on the upper and lower sides of the two ends of the end plates and connected with the support frames, guide rails horizontally and vertically arranged on the opposite surfaces of the support frames, mounting seats slidably connected with the guide rails, fastening bolts arranged between the mounting seats and the guide rails, a vibration model arranged between the mounting seats and parallel to the test model, vibration equipment arranged on the mounting seats and used for causing the forced vibration model to vibrate, a laser displacement sensor arranged on the support frames and used for detecting the vibration of the vibration model and the test model, and a pressure scanning valve arranged on the support frames and used for detecting the surface aerodynamic force data of the vibration model and the test model.

[0006] In the present scheme, the vibration device is used to force the vibration model to vibrate, and the vibration model vibrates at the same time to cause interference effect with the test model, so that the test model vibrates; at the same time, the test model and the vibration model are in the wind tunnel environment and vibrate due to aerodynamic interference, the two situations are superimposed, the state of the model is detected in real time through the laser displacement sensor and the pressure scanning valve, which can better fit the actual situation and improve the accuracy of the test; in addition, by adjusting the distance between the vibration model and the test model through the sliding mounting seat, and replacing the beam model with different end surfaces, the situation of different double-width bridges under the influence of forced vibration and interference effect can be tested.

[0007] Further, one end of the guide rail is rotatably connected with a support frame, arc-shaped grooves are formed in the support frame, the other end of the guide rail is slidably connected with the arc-shaped grooves, and the guide rail and the arc-shaped grooves are locked by fastening bolts; a through groove coaxial with the test model is formed in the end plate, mounting shafts coaxial with the connecting shafts are rotatably connected in the through groove, the end portion of the test model is detachably connected with the mounting shafts, a sliding groove coaxial with the mounting shafts is formed in one end of the mounting shafts facing the guide rail, a connecting rod is slidably connected in the sliding groove, a plurality of clamping grooves parallel to the connecting rod are uniformly arranged on the one end of the connecting rod facing the guide rail, a connecting groove coaxial with the connecting rod is formed in the end portion of the guide rail, and a protrusion matched with the clamping groove is arranged on the inner wall of the connecting groove.

[0008] During the test, the wind attack angle needs to be adjusted to simulate different conditions; at this time, the connecting rod is slid in the direction of the connecting groove, the end portion of the connecting rod is inserted into the connecting groove, the connecting shaft is synchronously rotated with the guide rail through the cooperation of the protrusion and the clamping groove; at the same time, the other end of the connecting rod is no longer abutted with the limiting rod, the limiting rod slides out of the limiting hole under the action of the elastic return element, so that the mounting shaft can rotate relative to the end plate; at this time, only the fastening bolts need to be removed, the guide rail is rotated, the guide rail drives the vibration model to rotate, and the guide rail drives the connecting shaft to synchronously rotate through the connecting rod, so as to adjust the wind attack angle; during the whole adjustment process, the bridge surfaces of the test model and the vibration model always remain parallel, which conforms to the actual situation and does not need to be adjusted additionally, thereby reducing the error between the test model and the vibration model; after the adjustment is completed, the guide rail is locked, the connecting rod is reversely slid, the connecting rod is separated from the connecting groove, the test model can freely vibrate, the end portion of the connecting rod pushes the limiting rod, and the limiting rod is inserted into the limiting hole to lock the mounting shaft and the end plate, so as to prevent the test model from deflecting during the vibration process and causing an included angle between the test model and the vibration model, thereby affecting the test.

[0009] Further, the vibration device comprises rotating shafts which are detachably connected to two ends of the vibration model, and the ends of the rotating shafts are connected with connecting seats, the ends of the connecting seats are vertically slidably connected with mounting seats, the mounting seats are provided with vertical motion servo motors for driving the vertical movement of the connecting seats, and the connecting seats are provided with torsional motion servo motors for driving the torsional movement of the rotating shafts.

[0010] In the scheme, the vertical motion servo motors drive the vibration model to vibrate vertically, and the torsional motion servo motors drive the vibration model to torsionally move, thereby simulating the disordered vibration in reality.

[0011] Further, the connecting rods and the sliding grooves are also provided with elastic return members, and the connecting grooves are provided with electromagnets for attracting the connecting rods.

[0012] Further, the arc-shaped grooves are provided with angle marks, and the guide rails are provided with distance marks.

[0013] Further, the connecting rods are provided with wear-resistant layers.

[0014] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, which is to be taken as a combination of the specification, the claims, and the appended drawings. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the objects, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for description:

[0016] Figure 1 The drawings are structural schematic views of embodiments of the present application;

[0017] Figure 2 The drawings are structural schematic views of embodiments of the present application; Figure 1 The drawings are structural schematic views of embodiments of the present application;

[0018] Figure 3 The drawings are structural schematic views of embodiments of the present application;

[0019] Figure 4 The drawings are structural schematic views of embodiments of the present application; Figure 3 The drawings are structural schematic views of embodiments of the present application;

[0020] In the drawings, the following signs are used: support frame 1, test model 2, suspension spring 3, guide rail 4, end plate 5, mounting seat 6, fastening bolt 7, vibration model 8, arc-shaped groove 9, mounting shaft 10, connecting rod 11, clamping groove 12, protrusion 13, limiting rod 14, elastic return member 15, rotating shaft 16, connecting seat 17, electromagnet 18. DETAILED DESCRIPTION

[0021] As Figures 1-4 shown:

[0022] A double-width bridge test device considering forced vibration and interference effect, comprising symmetrically arranged support frames 1 fixed at the bottom in a wind tunnel; a test model 2 is arranged between the support frames 1, the end of the test model 2 is provided with an end plate 5, a suspension spring 3 is vertically arranged on the upper side of the two ends of the end plate 5, and the suspension spring 3 is connected with the support frame 1; horizontal guide rails 4 are arranged on the opposite faces of the support frames 1, and the guide rails 4 are perpendicular to the test model 2, mounting seats 6 are slidingly connected on the guide rails 4, and the mounting seats 6 and the guide rails 4 are locked through fastening bolts 7; a vibration model 8 parallel to the test model 2 is arranged between the mounting seats 6, vibration equipment for causing the vibration model 8 to vibrate is arranged on the mounting seat 6; laser displacement sensors (conventional technical means, not shown in the figure) for detecting the vibration of the vibration model 8 and the test model 2 are arranged on the support frames 1, and pressure scanning valves (conventional technical means, not shown in the figure) for detecting the surface aerodynamic force data of the vibration model 8 and the test model 2 are also arranged on the support frames 1.

[0023] In the scheme, the vibration equipment is used to cause the vibration model 8 to vibrate, and the vibration model 8 causes interference effect with the test model 2 while vibrating, so that the test model 2 vibrates; at the same time, the test model 2 and the vibration model 8 are in a wind tunnel environment, and vibrate due to aerodynamic interference, the two cases are superimposed, and the state of the model is detected in real time through the laser displacement sensor and the pressure scanning valve, which can better fit the actual situation and improve the precision of the test; in addition, by sliding the mounting seat 6, the distance between the vibration model 8 and the test model 2 is adjusted, and different beam model bodies with different end faces are replaced, so that the conditions of different double-width bridges under the influence of forced vibration and interference effect can be tested.

[0024] In the embodiment, one end of the guide rail 4 is fixedly connected with the support frame 1, the support frame 1 is provided with an arc-shaped slot 9, the other end of the guide rail 4 is slidably connected with the arc-shaped slot 9, and the guide rail 4 and the arc-shaped slot 9 are locked by the fastening bolt 7; the end plate 5 is provided with a through slot coaxial with the test model 2, the through slot is rotatably connected with the mounting shaft 10 coaxial with the connecting shaft, the test model 2 is detachably connected with the mounting shaft 10, the mounting shaft 10 is provided with a sliding slot coaxial with the connecting shaft at one end thereof, the sliding slot is slidably connected with the connecting rod 11, the connecting rod 11 is uniformly provided with a plurality of clamping slots 12 parallel to the connecting rod 11 at one end thereof, the guide rail 4 is provided with a connecting slot coaxial with the connecting rod 11 at one end thereof, and the inner wall of the connecting slot is provided with a protrusion 13 matched with the clamping slot 12; the connecting shaft is provided with a plurality of grooves in communication with the sliding slot, the grooves are slidably connected with the limiting rods 1414, the limiting rods 1414 and the grooves are provided with the elastic reset members 15, and the end face of the connecting rod 11 facing the sliding slot is arc-shaped; the through slot is provided with a plurality of limiting holes matched with the limiting rods 1414.

[0025] During the test, the wind attack angle needs to be adjusted to simulate different conditions; at this time, the connecting rod 11 is slid in the direction of the connecting slot, the end of the connecting rod 11 is inserted into the connecting slot, the connecting shaft is synchronously rotated with the guide rail 4 through the cooperation of the protrusion 13 and the clamping slot 12; at the same time, the other end of the connecting rod 11 is no longer abutted with the limiting rod 1414, the limiting rod 1414 slides out of the limiting hole under the action of the elastic reset member 15, the mounting shaft 10 can be rotated relative to the end plate 5, at this time, only the fastening bolt 7 needs to be removed, the guide rail 4 is rotated, the guide rail 4 drives the vibration model 8 to rotate, and the guide rail 4 drives the connecting shaft to synchronously rotate through the connecting rod 11, so as to adjust the wind attack angle, during the whole adjustment process, the bridge of the test model 2 and the vibration model 8 always keeps parallel, which conforms to the actual situation, without the need for additional adjustment, the error between the test model 2 and the vibration model 8 is reduced; after the adjustment is completed, the guide rail 4 is locked, the connecting rod 11 is reversely slid, the connecting rod 11 is separated from the connecting slot, the test model can freely vibrate, the end of the connecting rod 11 presses and drives the limiting rod 1414, the limiting rod 1414 is inserted into the limiting hole, the mounting shaft 10 and the end plate 5 are locked, and the test model 2 is prevented from being deflected during the vibration process, so as to avoid the angle between the test model 2 and the vibration model 8, which affects the test.

[0026] In the embodiment, the vibration device comprises a rotating shaft 16 detachably connected with both ends of the vibration model 8, the rotating shaft 16 is connected with a connecting seat 17 at the end, the connecting seat 17 is vertically slidably connected with the mounting seat 6 at the end, the mounting seat 6 is provided with a vertical motion servo motor for driving the vertical movement of the connecting seat 17, and the connecting seat 17 is provided with a torsional motion servo motor for driving the torsional movement of the rotating shaft 16.

[0027] In the present scheme, the vertical motion servo motor drives the vibration model 8 to vibrate vertically, and the torsional motion servo motor drives the vibration model 8 to twist, simulating the real disordered vibration.

[0028] In the present embodiment, the connecting rod 11 and the sliding groove are also provided with elastic reset members 15, and the connecting groove is provided with electromagnets 18 for adsorbing the connecting rod 11; when it is necessary to adjust the wind attack angle, the electromagnets 18 are controlled to be powered on to adsorb the connecting rod 11, so that the connecting rod 11 is inserted into the connecting groove; after the adjustment is completed, the electromagnets 18 are controlled to be powered off, and the connecting rod 11 is reset under the control of the elastic reset members 15.

[0029] In the present embodiment, the edge of the arc-shaped groove 9 is provided with angle marks, and the guide rail 4 is provided with distance marks, so as to indicate the angle adjustment of the wind attack angle and the interval adjustment between the vibration model 8 and the test model 2.

[0030] In the present embodiment, the connecting rod 11 is provided with a wear-resistant layer on the side, so as to prevent the connecting rod 11 from being worn during sliding, which causes the clamping groove 12 on the connecting rod 11 to fail to cooperate with the protrusion 13.

[0031] Finally, it should be explained that the above preferred embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application 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 application.

Claims

1. A two-span bridge test apparatus considering forced vibration and disturbance effects, comprising support frames symmetrically arranged in a wind tunnel, characterized in that: The support frame is provided with a test model, and the end of the test model is provided with an end plate, and the upper and lower sides of the two ends of the end plate are vertically provided with suspension springs connected with the support frame; the opposite faces of the support frame are provided with rails perpendicular to the test model, and the rails are slidably connected with mounting seats, and the mounting seats and the rails are locked by fastening bolts; the mounting seats are provided with a vibration model parallel to the test model, and the mounting seats are provided with a vibration device for forcing the vibration model to vibrate; the support frame is provided with a laser displacement sensor for detecting the vibration of the vibration model and the test model, and the support frame is also provided with a pressure scanning valve for detecting the surface aerodynamic force data of the vibration model and the test model; one end of the rail is rotatably connected with the support frame, and the support frame is provided with an arc-shaped groove, and the other end of the rail is slidably connected with the arc-shaped groove, and the rail and the arc-shaped groove are locked by fastening bolts; the end plate is provided with a through groove coaxial with the test model, and the through groove is rotatably connected with a mounting shaft coaxial with the connecting shaft, and the end of the test model is detachably connected with the mounting shaft, and the end of the mounting shaft towards the rail is provided with a sliding groove coaxial with the connecting shaft, and the sliding groove is slidably connected with a connecting rod, and the end of the connecting rod towards the rail is uniformly provided with a plurality of clamping grooves parallel to the connecting rod, and the end of the rail is provided with a connecting groove coaxial with the connecting rod, and the inner wall of the connecting groove is provided with a protrusion matched with the clamping groove; a plurality of recesses are formed in the circumferential side of the connecting shaft and communicated with the sliding groove, and the recesses are slidably connected with a limiting rod, and the limiting rod and the recess are provided with an elastic reset member, and the end face of the connecting rod towards the sliding groove is arc-shaped; a plurality of limiting holes matched with the limiting rod are arranged on the circumferential side of the inner wall of the through groove.

2. A two-span bridge testing apparatus that takes into account forced vibrations and interference effects according to claim 1, characterized in that: The vibration device comprises a rotating shaft detachably connected with the two ends of the vibration model, and the end of the rotating shaft is connected with a connecting seat, and the end of the connecting seat is vertically slidably connected with the mounting seat, and the mounting seat is provided with a vertical motion servo motor for driving the vertical movement of the connecting seat, and the connecting seat is provided with a torsional motion servo motor for driving the torsional movement of the rotating shaft.

3. A two-span bridge testing apparatus that takes into account forced vibrations and interference effects according to claim 2, characterized in that: The connecting rod and the sliding groove are also provided with an elastic reset member, and the connecting groove is provided with an electromagnet for adsorbing the connecting rod.

4. A two-span bridge testing apparatus that takes into account forced vibrations and interference effects according to claim 3, characterized in that: The edge of the arc-shaped groove is provided with an angle mark, and the rail is provided with a distance mark.

5. A two-span bridge testing apparatus that takes into account forced vibrations and interference effects according to claim 4, characterized in that: The connecting rod is provided with a wear-resistant layer on the circumferential side. The connecting rod is provided with a wear-resistant layer on the circumferential side.

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