CN212321037U

CN212321037U - Natural wind field vortex vibration test device for super-large-proportion aeroelastic model of long-span continuous steel box girder bridge

Info

Publication number: CN212321037U
Application number: CN202021791052.2U
Authority: CN
Inventors: 许福友; 王博; 王旭; 董博文; 张明杰
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-01-08
Anticipated expiration: 2030-08-25

Abstract

The utility model provides a stride continuous steel box girder bridge super large proportion aeroelastic model nature wind field vortex test device that shakes greatly, including the pier that plays the fixed stay effect, the support of simulation girder boundary condition, the core beam of simulation case roof beam rigidity and the coat of simulation aerodynamic configuration. The main parts of the device can be repeatedly utilized for many times, and various parameters can be conveniently adjusted to meet the simulation requirements of different bridge projects. Compared with a wind tunnel test method, the test device can ensure that the test model is not limited by the size of a wind tunnel, the scale ratio of the model can be several times that of a large wind tunnel test model, the rigidity, the frequency ratio and the wind speed ratio of the model can be improved, the Reynolds number is greatly improved, and the test precision is also improved; and large-scale wind tunnel test equipment is not required to be occupied, and a large amount of energy consumption can be saved. Compared with a real bridge field test, the device is convenient for changing bridge model parameters and can be repeatedly used for many times, so that vortex vibration research of a comprehensive system is more convenient to develop, and the test difficulty and the cost are greatly reduced.

Description

Natural wind field vortex vibration test device for super-large-proportion aeroelastic model of long-span continuous steel box girder bridge

Technical Field

The utility model belongs to the technical field of the test research that shakes of continuous steel box girder bridge whirlpool in the anti-wind design of bridge, a test device of the research that shakes of whirlpool in the natural wind field of the continuous steel box girder bridge super large proportion aeroelastic model of striding greatly is related to.

Background

The long-span continuous steel box girder bridge has the advantages of strong spanning capability, large structural rigidity, good anti-seismic performance, convenient construction, smooth high-speed driving and the like, is favored by bridge designers, a large number of long-span continuous steel box girder bridges are built around the world, and more and larger-span continuous steel box girder bridges are built in the future. The large-span continuous steel box girder bridge has the advantages that due to the fact that the section is blunt, the mass is light, the damping is small, the frequency is low, the cases that the real bridge generates large-amplitude vertical bending vortex vibration are not enumerated, and for example, the Russian Volgar bridge, the Japan Tokyo bay bridge, the Chinese Chongqi bridge and the like generate large-amplitude vertical vortex vibration. Fortunately, reports about the torsional vortex vibration of a long-span continuous steel box girder bridge are not found so far, so that attention can be paid to the torsional vortex vibration.

Although the vortex vibration of the long-span continuous steel box girder bridge cannot cause catastrophic damage to the structure, the vortex vibration can affect the driving comfort and safety, cause the fatigue damage and even damage of components, and cause wide adverse social effects. Therefore, the vortex vibration of the long-span continuous steel box girder bridge needs to be strictly controlled. For the research on the vortex vibration of the long-span continuous steel box girder bridge, the method mainly comprises two methods in the past: aeroelastic model wind tunnel test and real bridge on-site monitoring. The wind tunnel test has the advantages that: (1) the wind field parameters (such as wind speed, wind direction, wind attack angle, turbulence degree and the like) are controllable and can be set according to requirements; (2) the wind tunnel test is carried out indoors and is generally not influenced by changes of atmospheric environment (such as seasons, day and night, wind and rain, air temperature and the like); (3) the model and the test instrument are convenient to install, operate and use, and can be used for continuous tests. The disadvantages include: (1) the wind tunnel test model is small (the ratio is 1:100-1:50), and the Reynolds number effect is obvious; (2) a special large wind tunnel laboratory is needed, and the energy consumption is high; (3) wind tunnels are difficult to simulate complex natural wind field characteristics. Real bridge on-site monitoring advantages include: (1) by arranging sensors such as an anemometer and an acceleration sensor on site, vortex vibration of the bridge structure under the actual incoming flow condition can be acquired, and the method belongs to one hand of real data; (2) the method is not limited by similar criteria, and the detailed structure, the geometric nonlinearity, the material nonlinearity and the like are all truly embodied; (3) the bridge wind-induced response can be monitored for a long time by combining a bridge health monitoring system. The disadvantages include: (1) the arrangement of the real bridge sensor has a plurality of problems, such as high difficulty, high investment and high maintenance cost; (2) the frequency of the vortex vibration of the bridge is limited, the measured data is few, and a large amount of measured data with research value is difficult to obtain; (3) once the bridge is built, system parameters (parameters such as pneumatic appearance, modal parameters and boundary conditions) are difficult to adjust, and the research efficiency is low.

For cable bearing bridges (cable-stayed bridges, suspension bridges and arch bridges with suspenders), the steel box girder bridge has relatively simple structure and stress, relatively few requirements on model design and manufacturing, and low design and manufacturing difficulty. The main characteristics of the method include: (1) the model design does not need to strictly meet the Froude number similarity criterion, so the frequency ratio between the real bridge and the model can be selected in a large range according to the scale ratio and the wind speed ratio of the model, and is basically not limited, thereby providing great convenience for the selection of core beam model materials with analog rigidity; (2) the modeling, the height and the rigidity of the bridge pier basically have no influence on the vertical bending vortex vibration of the steel box girder, so that a group of bridge pier models do not need to be specially made for each bridge to be tested, and the same bridge pier models can be repeatedly utilized, so that the test period can be greatly shortened, and the test cost is saved; (3) the vertical bending rigidity and the mass distribution of the constant-section continuous steel box girder are basically unchanged along the axial direction of the bridge, so the core girder for simulating the rigidity can directly adopt light-weight, high-strength, corrosion-resistant and rust-proof metal sectional materials which are very easily bought in the market, such as galvanized steel pipes, channel steel, steel bent frames, aluminum pipes, channel aluminum, aluminum bent frames and the like, the size, the number and the like of the core girder are determined according to the parameters such as the quality, the rigidity and the like of the solid steel box girder, the special design and processing are basically not needed, the constant-section core girder can be repeatedly utilized for a plurality of times, and can be assembled into a plurality of forms, and the rigidity of the constant-section core girder is; in addition, in order to improve the vortex vibration locking wind speed, the rigidity and the vibration frequency of the core beam can be improved, and further the wind speed ratio and the test precision are improved; (4) for the variable cross-section box girder, the vertical bending rigidity and the mass distribution of the variable cross-section box girder are changed along the longitudinal direction of the bridge, so that a variable height steel plate or an aluminum plate can be welded on a top plate or a bottom plate of a constant cross-section profile, the thickness, the height and the number of the steel plates are designed according to the similar rigidity, and the design calculation and the processing are very convenient; (5) the coat for simulating the pneumatic appearance of the box girder can be made of organic glass plates, aluminum plates, steel plates, foam plates and the like, and the pneumatic appearance can be conveniently adjusted according to research needs (such as thickening, widening, angle adjustment and the like); (6) the large-span continuous steel box girder bridge generally adopts two-span or three-span one-connection and also has multi-span one-connection practical engineering, but in order to increase the model proportion and improve the test precision, the multi-span condition also generally simplifies the approximate two-span or three-span model, and correspondingly needs three or four piers. According to the test site conditions, the position of one pier can be fixed, and the positions of other piers can be adjusted, so that the device can be conveniently adapted to different spans and the axial and wind direction requirements of the bridge. Based on the reasons, the test platform and the device for repeated use of different spans and different main beam sections can be manufactured, comprehensive and comprehensive research on the continuous box girder vortex vibration is facilitated, the test period is greatly shortened, and the test cost is reduced. Aiming at the defects of the wind tunnel test and the field actual measurement method for researching the vortex vibration of the long-span continuous steel box girder bridge, the method and the device for developing the vortex vibration test research in a good natural wind field by adopting the super-large-proportion aeroelastic model are provided, and the method and the device have relative advantages and characteristics.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to stride the needs of continuous steel box girder bridge whirlpool research of shaking greatly, provide one kind and can compensate some not enough that present wind tunnel test method and real bridge observation method face, develop the test device that strides continuous steel box girder bridge super large proportion aeroelastic model whirlpool of shaking greatly under the different operating mode conditions in good natural wind field. The device mainly comprises a pier, a support, a box girder core beam, a height-variable steel plate or aluminum plate, a box girder pneumatic coat, a railing, a central separation belt and a balancing weight. In addition, instrument equipment such as an acceleration sensor, a high-speed camera, an anemoscope and the like can be additionally arranged according to test conditions and requirements.

The technical scheme of the utility model:

the natural wind field vortex vibration test device of the large-scale proportional aeroelastic model of the long-span continuous steel box girder bridge is arranged in a flat open test field with good natural wind field conditions (high wind speed, stable wind field, low turbulence and long duration of the wind field). The test device comprises a pier 1, a support 2, a box girder core beam 3, a height-variable steel plate or aluminum plate 4 (adjusting the vertical bending rigidity of the section of the height-variable box girder), a box girder pneumatic coat 5, a railing 6, a central separation belt 7 and a balancing weight 8. The pier 1 ensures sufficient height, strength and rigidity. According to the scale ratio (1:20-1:10) of the aeroelastic model, for the sake of economy and convenience, the steel tube can be made of a round (diameter 0.5-0.8m) or rectangular (0.5-0.8m) steel tube (wall thickness is 10-20 mm) with two ends sealed, the height is 2.5-4 m, and the bottom of the steel tube is welded on the top surface of a steel plate (with the transverse bridge length of 2-2.5m, the longitudinal bridge width of 0.8-1m and the thickness of 15-20mm) serving as a base. The concrete block is placed on the steel plate base to be pressed (on one hand, manufacturing cost can be saved as much as possible, 1/10 which is insufficient for steel materials is achieved, on the other hand, the concrete block is separated from the steel plate base, moving is convenient, corrosion cannot occur, and overturning of the pier 1 under the action of wind load is prevented. The lifting lugs are arranged at the positions, close to four corners, of the steel plate base, so that the position of the bridge pier 1 can be conveniently lifted and adjusted. The support 2 is fixedly connected to the top of the pier 1, and the support 2 can adopt a proper jack, so that the heights of two sides of the model can be conveniently adjusted, namely the included angle between the model and the horizontal plane is changed, and different wind attack angles are realized; the box girder core beam 3 is placed on the top of the support 2, and simply supported, hinged or fixedly supported, and for the continuous bridge with the equal section, the rigidity and the mass distribution are basically unchanged along the axial direction of the bridge, so the box girder core beam 3 can generally select the metal section with the equal section; for the variable cross-section box girder, a variable height steel plate or an aluminum plate 4 can be welded on a top plate or a bottom plate of the constant cross-section profile to simulate the variable cross-section box girder; the box girder pneumatic coat 5 is wrapped on the box girder core girder 3 and the height-variable steel plate or the aluminum plate 4, the box girder pneumatic coat 5 and the core girder 3 are fixedly connected together by a diaphragm plate or other suitable connecting pieces, and the box girder pneumatic coat 5 can conveniently adjust the pneumatic appearance by thickening, widening, adjusting the angle and the like according to the research requirement; for the bridge-forming state, auxiliary facilities such as a railing 6 and a central separation belt 7 can be added according to needs so as to research the vortex vibration phenomenon of the super-large-proportion continuous steel box girder bridge model under different aerodynamic shapes. In addition, the weight 8 may be required to simulate the mass distribution of the system according to the mass of the core beam 3, the height-variable steel plate or aluminum plate 4, the box beam pneumatic coat 5, the railing 6, the central dividing strip 7 and other existing components, so as to realize the similarity of the modal shape and the modal mass. It is known from the theory that under otherwise constant conditions, the eddy vibration response is related to the Scruton number (related to the product of mass and damping ratio). Therefore, the mass of the mold can be greatly reduced by increasing the damping ratio, and the test cost (material cost, machining cost, installation cost, etc.) can be reduced. Wind-induced acceleration and displacement vibration signals of the super-large-proportion continuous steel box girder bridge aeroelastic model are collected by an acceleration sensor 9 or a high-speed camera 10, and wind field parameters (wind speed, wind direction and the like) can be monitored by a three-dimensional anemometer 11 during field test.

The utility model has the advantages that: the large-span continuous steel box girder bridge super-large-proportion aeroelastic model vortex vibration test is developed in a good natural wind field, and has the following advantages: (1) large wind tunnel test equipment is not needed, and a large amount of energy consumption is saved; (2) the scale of the model can be improved by 3 times or even more than that of a large-scale wind tunnel test, the model proportion can reach 1/10, and the scale of the full-bridge aeroelastic model in the wind tunnel laboratory is less than 1/50 at all times; (3) the wind tunnel laboratory can not truly simulate the natural wind field characteristics, and part of parameters (such as wind speed spectrum, integral scale and the like) have great difference; (4) compared with actual measurement on a real bridge site, the device is convenient for changing the self conditions (span, axial direction, aerodynamic shape, mass, rigidity, damping and attack angle) of the bridge, and can be repeatedly utilized for many times, thereby being more convenient for developing comprehensive system research; (5) compared with real bridge field actual measurement, the test difficulty and the cost are greatly reduced, and the sensor and the test equipment are convenient to disassemble, assemble and detect.

Drawings

FIG. 1 is a structural diagram of a natural wind field vortex vibration test device of a large-span constant-section continuous steel box girder bridge super-large proportion aeroelastic model.

FIG. 2 is a structural diagram of a natural wind field vortex vibration test device of a large-span variable-section continuous steel box girder bridge super-large-scale aeroelastic model.

Fig. 3 is a schematic view of the connection of the core beam, the height-adjustable steel plate or the aluminum plate of the box girder.

Fig. 4 is a partial schematic view of a pier steel plate base, a lifting lug and a concrete block.

FIG. 5 is a vertical layout view of a natural wind field vortex vibration test device of a large-span continuous steel box girder bridge super-large proportion aeroelastic model.

In the figure: 1, bridge piers; 2, a support; 3, a box girder core beam; 4-step high steel plate or aluminum plate; 5 box girder pneumatic coat; 6, a railing; 7 a central separator; 8, a balancing weight; 9 an acceleration sensor; 10 a high-speed camera; 11 three-dimensional anemometer.

Detailed Description

The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1, 2, 3, 4 and 5, the natural wind field vortex vibration test device of the large-span continuous steel box girder bridge super-large-scale aeroelastic model comprises a pier 1, a support 2, a box girder core beam 3, a height-changing steel plate or aluminum plate 4, a box girder pneumatic coat 5, a rail 6, a central separation belt 7 and a counterweight 8. The pier 1 is arranged on a flat ground, so that enough height, strength, rigidity and anti-overturning performance are ensured, and the position of the pier 1 can be adjusted according to the span and axial requirements of the bridge; the support 2 is fixedly connected to the top of the pier 1; the box girder core girder 3 is placed on the top of the support 2, and a proper jack can be adopted as the support to conveniently adjust the elevation of the core girder 3 to realize different wind attack angles with simple, hinged or fixed support, and for the box girder with equal section, a light high-strength anti-corrosion and anti-rust metal section with equal section can be generally selected; for the variable cross-section box girder, a variable height steel plate or an aluminum plate 4 can be welded on a top plate or a bottom plate of the constant cross-section profile, and the thickness, the height and the number of the variable cross-section box girder are designed according to the similarity of rigidity; the box girder core beam 3 can be repeatedly used for a plurality of times, the size of the box girder core beam is convenient to adjust, and the box girder core beam can be assembled into a plurality of forms and the rigidity of the box girder core beam is adjusted to meet different test requirements. The box girder pneumatic coat 5 is wrapped on the box girder core girders 3 (and 4), the box girder pneumatic coat can be made of organic glass plates, aluminum plates, steel plates, foam plates and the like, the box girder pneumatic coat 5 and the core girders 3 are fixedly connected together by a diaphragm plate or other suitable connecting pieces, and the box girder pneumatic coat 5 can also conveniently adjust the pneumatic appearance according to the research requirement; auxiliary facilities such as a railing 6 and a central separation belt 7 can be added according to needs so as to research the vortex vibration phenomenon of the large-span continuous steel box girder bridge super-large-scale aeroelastic model under different aerodynamic shapes. In addition, it may be desirable to have clump weights 8 (placed inside the garment, not affecting the aerodynamic profile) to simulate the system mass distribution based on the mass of existing components such as the core beams 3 (and 4), the box beam pneumatic garment 5, the

appurtenances

6 and 7, etc. The vortex vibration signals of the large-span continuous steel box girder bridge super-large-proportion aeroelastic model are acquired by an acceleration sensor 9 (generally in a span-center section and a 1/4 section) or a high-speed camera 10 (needing to be arranged at a proper position), and wind field parameters (wind speed, wind direction and the like) can be monitored by a three-dimensional anemometer 11 (generally the same as the height of a main girder) during field test, so that input parameters can be provided for subsequent vortex vibration research.

Claims

1. A natural wind field vortex vibration test device for a large-span continuous steel box girder bridge super-large proportion aeroelastic model is characterized by comprising a pier (1), a support (2), a box girder core beam (3), a height-variable steel plate or aluminum plate (4) and a box girder pneumatic coat (5); the pier (1) is arranged on a flat ground, and sufficient height, strength, rigidity and anti-overturning performance are ensured; the support (2) is fixedly connected to the top of the pier (1); the box girder core beam (3) is arranged at the top of the support (2) and is simply, hinged or fixedly supported with the support; the box girder pneumatic coat (5) is wrapped outside the box girder core beam (3).

2. The natural wind field vortex vibration test device for the large-span continuous steel box girder bridge with the ultra-large proportion aeroelastic model according to claim 1, is characterized in that a variable-height steel plate or aluminum plate (4) is additionally arranged according to requirements, and the variable-height steel plate or aluminum plate (4) is welded on the surface of a box girder core beam (3) so as to simulate the vertical bending rigidity of different sections of the variable-section continuous steel box girder bridge; at the moment, the box girder pneumatic coat (5) is wrapped outside the box girder core beam (3) and the height-variable steel plate or aluminum plate (4), and the height-variable steel plate or aluminum plate (4) is arranged on the top of part of the support (2) and is simply, hinged or fixedly supported with the support.

3. The natural wind field vortex vibration test device for the large-span continuous steel box girder bridge ultra-large proportion aeroelastic model according to claim 1 or 2, characterized in that a railing (6), a central separation belt (7) and a balancing weight (8) are added according to test requirements, and the railing (6) and the central separation belt (7) are connected to a box girder pneumatic coat (5); the balancing weight (8) is welded on the box girder core beam (3).

4. The natural wind field vortex vibration testing device of the large-span continuous steel box girder bridge ultra-large-proportion aeroelastic model according to claim 1 or 2, characterized by further comprising an acceleration sensor (9), a high-speed camera (10) and a three-dimensional anemometer (11), wherein vortex vibration acceleration and displacement signals are respectively collected by the acceleration sensor (9) or the high-speed camera (10), and wind field parameters are monitored by the three-dimensional anemometer (11) during field testing.

5. The natural wind field vortex vibration test device of the large-span continuous steel box girder bridge ultra-large-proportion aeroelastic model according to claim 3, characterized in that the test device further comprises an acceleration sensor (9), a high-speed camera (10) and a three-dimensional anemometer (11), vortex vibration acceleration and displacement signals are respectively collected by the acceleration sensor (9) or the high-speed camera (10), and wind field parameters are monitored by the three-dimensional anemometer (11) during field tests.

6. The natural wind field vortex vibration test device for the large-span continuous steel box girder bridge super-large-proportion aeroelastic model according to claim 1, 2 or 5, wherein the box girder pneumatic coat (5) is made of organic glass plates, aluminum plates, steel plates or foam plates.

7. The natural wind field vortex vibration test device for the large-span continuous steel box girder bridge ultra-large proportion aeroelastic model according to claim 3, wherein the box girder pneumatic coat (5) is made of organic glass plates, aluminum plates, steel plates or foam plates.

8. The natural wind field vortex vibration test device for the large-span continuous steel box girder bridge ultra-large proportion aeroelastic model according to claim 4, wherein the box girder pneumatic coat (5) is made of organic glass plates, aluminum plates, steel plates or foam plates.