CN214271661U

CN214271661U - Flexible device for controlling vortex vibration of bridge

Info

Publication number: CN214271661U
Application number: CN202022815668.5U
Authority: CN
Inventors: 许福友; 苏冰冰; 王博; 王旭
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-09-24
Anticipated expiration: 2030-11-30

Abstract

The utility model belongs to the technical field of the anti-wind of bridge, a flexible installation that control bridge whirlpool shakes is provided, including girder, bearing, spool, soft cloth and balancing weight. According to the vortex vibration control requirement of the bridge, a plurality of weather-resistant soft cloth materials which are safe, reliable, convenient to assemble and disassemble, adjustable in parameters and low in cost are arranged on the lower edge, the web plate or the bottom plate of the top plate of the bridge, so that the bridge is prevented from generating periodic vortex shedding around the section under the action of wind load, and finally the vortex vibration of the bridge is controlled or inhibited. Compared with the traditional pneumatic measures, the pneumatic measures have the main relative advantages of more convenient adjustment of size, shape and position, lower engineering cost and better control effect.

Description

Flexible device for controlling vortex vibration of bridge

Technical Field

The utility model belongs to the technical field of the anti-wind of bridge, a flexible device pneumatic means that control bridge whirlpool shakes is related to.

Background

Along with the increase of the span of the bridge, the structural rigidity and the damping can be reduced, and the wind sensitivity is enhanced. The bridge vortex vibration is a wind vibration mode with dual properties of self-excited vibration and forced vibration, and although dynamic instability damage of a bridge structure cannot be directly caused, the bridge vortex vibration can influence driving comfort greatly, even threatens driving safety, and can also cause fatigue damage of bridge members. The large-span steel box girder bridge is easy to generate vortex vibration due to relatively small mass and damping, and the vortex vibration wind speed is generally low. The steel truss bridge is good in ventilation performance, and stable vortex shedding is not easy to form, so that vortex vibration is not easy to occur. The concrete bridge is not easy to generate vortex vibration because of large dead weight, high damping, relatively smaller span than a steel bridge and high vibration frequency. The problem of obvious and even serious vortex vibration often occurs in the existing multi-seat long-span bridge at home and abroad, closed traffic can be caused, and huge economic loss is caused, so that the vortex vibration inhibition of the bridge is a very important research direction in the wind resistance field. At present, most of researches on bridge vortex vibration control are methods for preferentially adopting pneumatic measures, such as a rigid member control method for optimizing air nozzles, adding flow deflectors, flow inhibiting plates, grids and the like and permanently fixing the flow deflectors on a main beam. Once the measures are adopted, the measures are difficult to adjust and replace, and the results obtained through the wind tunnel test are not necessarily ideal when applied to the real bridge. In addition, some bridges are provided with dampers after vortex vibration occurs, so that structural damping is improved, and the vortex vibration is reduced or even inhibited. The two measures have higher cost, and the pneumatic measures with better economical efficiency and convenient adjustment of measure parameters need to be researched.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to the whirlpool problem of shaking that exists of striding the bridge greatly, provide one kind and hang the device of high strength, low price, weatherability, length adjustable flexibility, soft materials (generally adopt cloth material) on girder web or roof lower edge or bottom plate. The cloth material arranged at a reasonable position and having reasonable parameters changes the posture and even waves under the action of wind load, so that the generation of airflow vortex around the cross section of the bridge can be effectively avoided or destroyed, and the aim of controlling the vortex vibration of the bridge is further achieved. In order to achieve the best control effect of the measures on the bridge vortex vibration, the measures are generally installed on a rigid section model or a full-bridge aeroelastic model of a bridge girder, and relevant parameters including installation positions, shapes, sizes and the like of the measures are optimized through a wind tunnel test. The device mainly comprises a main beam, a bearing, a scroll, a soft cloth material and a balancing weight. The balancing weight is mainly used for adjusting the posture and the vibration form of the cloth under the action of wind load, and has the function of a damper so as to realize better control effect.

The technical scheme of the utility model:

a flexible device for controlling bridge vortex vibration comprises a main beam rigid model 1, a bearing 2, a scroll 3, a soft cloth 4 and a balancing weight 5; the girder 1, where vortex vibration is likely to occur, is the object to be controlled; the bearing 2 is fixed at a proper position of a web plate of the main beam or the lower edge of the top plate or the bottom plate along the bridge direction and is used for supporting the reel 3; the reel 3 is a rigid long straight rod and is supported by the bearing 2, and the reel 3 can rotate in the bearing 2; the soft cloth material 4 is wound on the scroll 3, and the free suspension length can be adjusted by rotating the scroll 3; after the soft cloth 4 is adjusted to the optimal suspension length, the reel 3 is fixedly connected with the bearing 2 to limit the rotation of the bearing, so that the suspension length of the soft cloth 4 is ensured to be constant; the tail end of the soft cloth material can be connected with a balancing weight 5 for adjusting the posture and the vibration form of the cloth material under the action of wind load.

The utility model has the advantages that: the soft cloth material with high strength, low cost and weather resistance can be hung on the lower edge of the main beam web plate or the top plate or the bottom plate, and the cloth material changes the posture and even waves under the action of wind to avoid or destroy the generation of airflow vortex, thereby achieving the aim of damping and suppressing vibration of the bridge. The device is simple to operate, firm in installation and low in cost, and can optimize certain parameters to achieve a better control effect.

Drawings

FIG. 1 is a diagram of a soft body device for controlling bridge vortex vibration.

In the figure: 1, a main beam; 2, a bearing; 3, a reel; 4, soft cloth material; and 5, a balancing weight.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

A soft device for controlling bridge vortex vibration mainly comprises a main beam rigid model 1, a bearing 2, a scroll 3, a soft cloth 4 and a balancing weight 5. Fixing a plurality of bearings 2 at proper positions of a top plate, a web plate and a bottom plate on the main beam 1 in a welding, riveting or bolting mode and the like; the reel 3 usually adopts a rigid long straight rod, and two ends of the rigid long straight rod penetrate through two adjacent bearings 2; a high-strength, low-cost and weather-resistant soft cloth 4 is wound on the reel 3; the reel 3 can freely rotate in the bearing 2 so as to adjust the suspension length of the soft cloth material 4 according to the requirement, and can be fixedly connected with the bearing 2 according to the requirement to limit the rotation and keep the length of the soft cloth material 4 unchanged; the balancing weights 5 with proper quality and quantity can be connected at the tail end of the soft cloth material 4 as required, and the balancing weights are used for adjusting the posture and the vibration form of the cloth material under the action of wind load so as to realize better control effect.

Preferably, the main beam 1 is not limited to the integral box beam section with the cantilever arm drawn in the drawing, but is also applicable to other various main beam sections, such as a streamline box beam section, a pi-shaped section and the like.

Preferably, the bearing 2 can be connected to the top plate, the web plate or the bottom plate of the main beam by welding, riveting or bolting.

Preferably, the reel 3 can rotate freely in the bearing 2 to adjust the hanging length of the soft cloth 4, or can be fixed with the bearing 2 according to requirements to keep the length of the soft cloth 4 unchanged under the action of wind load.

The shape of the soft cloth 4 is not limited to a rectangle, and may be any shape such as an inverted triangle, a trapezoid, or an arc.

Preferably, the soft cloth 4 is not necessarily arranged along the whole length of the bridge, but can be arranged discontinuously, so that the engineering cost is reduced.

Preferably, the soft cloth 4 may also be cloth with different apertures.

Preferably, the drooping length of the soft cloth 4 can be adjusted by rotating the reel according to the requirement of vortex vibration control, so as to achieve better control effect.

Preferably, the soft cloth 4 is not necessarily symmetrically arranged on both sides of the main beam, and the positions of the bearings 2 on both sides and the different drooping lengths of the soft cloth 4 can be adjusted according to the wind direction, so as to achieve a better control effect.

Preferably, the soft cloth material 4 should have good weather resistance, long service life and low engineering cost.

Preferably, the counterweight 5 is mainly used for adjusting the calm wind posture or the waving form of the cloth, and the weight and the number of the counterweight can be adjusted according to the requirement.

Preferably, the flexible device for controlling the bridge vortex vibration can also achieve the purpose of controlling the vibration by adjusting the position, the size, the material and the shape of the cloth for different sections of the main beam.

Claims

1. A flexible device for controlling bridge vortex vibration is characterized by comprising a main beam rigid model (1), a bearing (2), a scroll (3), a soft cloth material (4) and a balancing weight (5); the rigid model (1) of the girder, in which vortex vibration is likely to occur, is an object to be controlled; the bearing (2) is fixed on the lower edge of a main beam web plate or a top plate or a bottom plate along the bridge direction and is used for supporting the reel (3); the reel (3) is a rigid long straight rod, and two ends of the reel penetrate through two adjacent bearings (2) and can rotate in the bearings (2); the soft cloth material (4) is wound on the scroll (3), and the suspension length is adjusted by rotating the scroll; after the optimal suspension length of the soft cloth (4) is determined, the reel (3) is fixedly connected with the bearing (2), and the suspension length of the soft cloth (4) is kept unchanged; the tail end of the soft cloth material (4) is connected with a balancing weight (5) for adjusting the posture and the vibration form of the cloth material under the action of wind load.

2. The flexible arrangement according to claim 1, characterized in that the bearing (2) is fixed to the girder web or the lower edge of the top plate or the bottom plate by welding, riveting or bolting.

3. A flexible device according to claim 1 or 2, characterized in that the reel (3) is freely rotatable in a bearing to adjust the length of the soft cloth (4) and is also fixable to the bearing (2) as required to keep the length of the soft cloth (4) unchanged under the wind load.

4. The flexible device according to claim 1 or 2, characterized in that the soft cloth (4) is arranged along the entire length of the bridge or intermittently; the soft cloth material (4) is rectangular, inverted triangular, trapezoidal or arc-shaped; the soft cloth material (4) is made of cloth materials or net materials with different apertures.

5. The flexible device according to claim 3, characterized in that the soft cloth (4) is arranged along the entire length of the bridge or intermittently; the soft cloth material (4) is rectangular, inverted triangular, trapezoidal or arc-shaped; the soft cloth material (4) is made of cloth materials or net materials with different apertures.

6. The flexible device according to claim 1, 2 or 5, characterized in that the soft cloth (4) is symmetrically arranged on both sides of the rigid model (1) of the main beam, or the positions of the bearings (2) on both sides and different suspension lengths of the soft cloth (4) are adjusted according to the wind direction, so as to achieve better control effect.

7. The flexible device according to claim 3, characterized in that the soft cloth (4) is symmetrically arranged on both sides of the rigid model (1) of the main beam, or the positions of the bearings (2) on both sides and different suspension lengths of the soft cloth (4) are adjusted according to the wind direction, so as to achieve better control effect.

8. The flexible device according to claim 4, characterized in that the soft cloth (4) is symmetrically arranged on both sides of the rigid model (1) of the main beam, or the positions of the bearings (2) on both sides and different suspension lengths of the soft cloth (4) are adjusted according to the wind direction, so as to achieve better control effect.

9. Flexible device according to claim 1, 2, 5, 7 or 8, characterized in that the rigid model of the main beam (1) is a monolithic box beam section with cantilever arms, a split box beam section or a pi-shaped section.

10. Flexible device according to claim 6, characterized in that the rigid model of the main beam (1) is a section of an integral box girder with cantilever arms, a section of a split box girder or a section of a pi shape.