Damping device for inhibiting transverse torsion of bridge floor and improving walking comfort of bridge floor

Abstract

A damping device for restraining transverse torsion of a bridge floor and improving walking comfort of the bridge floor relates to the technical field of bridge damping and comprises a damper used for connecting a flange plate and a web plate on the same side of a box girder. The multiple dampers are arranged in the extending direction of the box girder at intervals. Vibration of the flange plate is controlled, vibration energy caused by traffic loads and wind loads is effectively absorbed and dissipated, transverse torsion of the flange plate is reduced, the stability and safety of a bridge structure are improved, meanwhile, aerodynamic performance is optimized, the influence of vortex-induced vibration is reduced, the walking comfort of pedestrians is improved, and the service life of the bridge is prolonged. The service life of the bridge is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge shock absorption, and in particular to a shock absorption device for suppressing lateral torsion of a bridge deck and improving walking comfort on the bridge deck. Background Art

[0002] With the rapid development of urban transportation, bridges, as important transportation facilities, have received more and more attention for their safety and comfort. Box girder bridges are widely used in various projects due to their structural stability and strong bearing capacity. However, in the existing box girder bridge design, the flange plates extend out to both sides. This design easily causes the flange plates to vibrate greatly during driving on the bridge deck. This phenomenon is especially obvious when the wind speed is low, which can easily cause vortex-induced vibration (Vortex-Induced Vibration), affecting the aerodynamic performance and structural safety of the bridge.

[0003] Vortex-induced vibration is a type of limited-amplitude vibration of a structure in the transverse direction of the wind induced by periodic vortex shedding when air flows through the bridge structure at a specific wind speed. This vibration not only affects the walking comfort of pedestrians on the bridge deck sidewalk, but in severe cases it may also cause structural fatigue damage, affecting the service life and safety of the bridge. For example, the large cantilever steel box girder of the Hong Kong-Zhuhai-Macao Bridge faced the problem of vortex-induced vibration during its design. Through wind tunnel tests and computational analysis, researchers found that increasing structural damping and adopting aerodynamic measures can effectively reduce the amplitude of vortex vibration.

[0004] In order to suppress vortex-induced vibration, some measures have been taken in the existing technology, such as increasing the structural damping ratio, installing wind barriers, deflectors and vortex isolation plates, etc. Although these measures can reduce the amplitude of vortex vibration to a certain extent, there are still some limitations. For example, increasing the structural damping ratio may increase the deadweight of the bridge, while the installation of wind barriers and deflectors may affect the appearance of the bridge and the driving line of sight. In addition, the effectiveness of these measures is often affected by many factors, such as the span of the bridge, wind speed, wind attack angle, etc., and detailed wind tunnel tests and analysis are required for specific situations. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art and provide a shock absorbing device that can suppress the lateral torsion of the bridge deck and improve the walking comfort on the bridge deck, while improving the vortex-induced vibration phenomenon and optimizing the aerodynamic performance of the bridge.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a shock-absorbing device for suppressing lateral torsion of the bridge deck and improving the walking comfort of the bridge deck, including a damper for connecting the flange plate and the web plate on the same side of the box girder; the number of the dampers is multiple and they are arranged at intervals along the extension direction of the box girder.

[0007] Preferably, the upper end of the damper is connected to the flange plate through an upper connecting rod, and the lower end is connected to the web plate through a lower connecting rod.

[0008] More preferably, the upper connecting rod is connected to the bottom end surface of the flange plate and is close to the outer side edge of the flange plate, and the lower connecting rod is connected to the outer side surface of the web plate and is close to the bottom edge of the web plate.

[0009] More preferably, the lower end of the damper is further connected to a rib rod, and the upper end of the rib rod is connected to the outer side surface of the web and close to the top edge of the web.

[0010] More preferably, the damper is a viscoelastic damper.

[0011] In addition, the present invention also provides a box girder bridge, which is provided with the above-mentioned shock absorbing device for suppressing the lateral torsion of the bridge deck and improving the walking comfort of the bridge deck.

[0012] Wherein, a sidewalk is arranged on the edge of the flange plate.

[0013] Compared with the prior art, the present invention can effectively consume and absorb the vibration energy of the flange plate caused by driving or wind load by connecting a damper between the flange plate and the web plate of the box girder, reduce the lateral torsion of the flange plate, thereby improving the stability and safety of the bridge structure, and helping to reduce and alleviate the vortex-induced vibration phenomenon of the bridge, optimize the aerodynamic performance of the bridge, reduce the impact of wind-induced vibration on the bridge, and improve the stability of the bridge under various wind speed conditions; at the same time, since the vibration of the flange plate is reduced, the vibration condition of the bridge deck sidewalk is directly improved, providing a more stable and comfortable walking environment for pedestrians. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure in Example 1; Figure 2 This is a schematic diagram of the overall structure in Example 2.

[0015] In the figure: 1——Damper 2——Box girder 3——Flange plate 4——web 5——upper connecting rod 6——lower connecting rod 7——Rib bar. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0017] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact through another feature between them. Example

[0018] like Figure 1 As shown, the shock absorbing device for suppressing the lateral torsion of the bridge deck and improving the walking comfort of the bridge deck includes a damper 1, which is used to connect the flange plate 3 and the web plate 4 on the same side of the box girder 2; the number of the dampers 1 is multiple and they are arranged at intervals along the extension direction of the box girder 2. The damper in this embodiment is a viscoelastic damper. Example

[0019] like Figure 2 As shown, different from Example 1, in this embodiment, the upper end of the damper 1 is connected to the flange plate 3 through the upper connecting rod 5, and the lower end is connected to the web 4 through the lower connecting rod 6. For the case where the flange plate 3 of some box girder bridges has a large extension width, only setting the damper 1 to connect the flange plate 3 and the web 4 requires configuring a damper 1 of a larger model and specification. Then, by setting the upper connecting rod 5 and the lower connecting rod 6, the size of the damper 1 can be reduced and the use cost can be reduced. In addition, the upper connecting rod 5 is connected to the bottom end surface of the flange plate 3 and is close to the outer edge of the flange plate 3, and the lower connecting rod 6 is connected to the outer side of the web 4 and is close to the bottom edge of the web 4. This layout also enables the damper 1 to more effectively transfer the load (such as vehicle load and wind load) on the flange plate 3 to the web 4. In this way, the damper 1 can more accurately control the flow direction of the force, reduce the local stress concentration of the flange plate 3, and thus protect the structure from excessive local loads.

[0020] In the specific application process, the damper 1 absorbs and consumes vibration energy through the internal damping medium (such as viscoelastic material). When the structure vibrates, the viscous material in the damper 1 will generate shear stress, converting the vibration energy into heat energy, thereby reducing the amplitude of the vibration. This process of energy conversion and consumption effectively reduces the vibration of the flange plate 3, so it can improve the aerodynamic performance and structural stability of the bridge. By reasonably designing the length and position of the upper connecting rod 5 and the lower connecting rod 6 as required, the vibration control effect of the damper 1 can actually be optimized, thereby more effectively controlling the vibration response of the entire bridge structure and improving the vibration reduction performance and walking comfort of the bridge.

[0021] Furthermore, the lower end of the damper 1 is also connected to a rib bar 7, and the upper end of the rib bar 7 is connected to the outer side of the web 4 and close to the top edge of the web 4. This design enhances the connection stability between the damper 1 and the web 4, provides additional support, and reduces the deflection of the damper 1 when subjected to force, because the setting of the rib bar 7 improves the energy dissipation efficiency of the damper 1 when subjected to force, because it increases the contact area and connection stiffness between the damper and the web, thereby more effectively converting vibration energy into heat energy or other forms of energy dissipation. This structural enhancement can improve the overall stability of the bridge, reduce structural damage caused by vibration, and thus also improve the service life of the entire shock absorbing device.

[0022] In this embodiment, the connection points of the upper connecting rod 5 and the flange plate 3, the connection points of the lower connecting rod 6 and the web plate 4, and the connection points of the rib rod 7 and the web plate 4 are all set to be hinged, so that a certain degree of relative rotation can be allowed, which can increase the flexibility of the structure, enable it to better adapt to deformation caused by temperature changes, traffic loads and wind loads, etc., reduce the internal force caused by the constraint force, and thus reduce the stress concentration of the structure and the potential risk of fatigue damage. In the specific application process, when the damper 1 is working, the hinge point can allow relative movement between the flange plate and the web plate, so it can be used as a way to release the internal force of the structure, which helps to consume vibration energy more effectively, thereby improving the shock absorption effect.

[0023] The shock absorbing device provided in the above-mentioned embodiment for suppressing the lateral torsion of the bridge deck and improving the walking comfort of the bridge deck can be applied to box girder bridges. The shock absorbing device is arranged between the flange plate 3 and the web plate 4 on both sides of the box girder bridge to achieve the effect of improving the stability, safety and pedestrian comfort of the bridge structure. Those skilled in the art should know that the traditional shock absorbing method is to arrange a damper between the pier and the box girder, which mainly controls the relative movement between the entire pier and the box girder. The damper 1 of the present invention is directly connected to the flange plate 3 and the web plate 4, and acts more directly on the vibration of the flange plate 3, providing a means of local vibration control, which is more effective in reducing the vibration and lateral torsion of the flange plate 3.

[0024] When a vehicle is traveling on the bridge deck, its weight and driving force will directly act on the flange plate 3 or be transmitted to the flange plate 3 through the bridge deck, causing the flange plate 3 to vibrate. At this time, the upper connecting rod 5 transmits the vibration of the flange plate 3 to the damper 1, and the viscoelastic material inside the damper 1 starts to work, absorbing and consuming the vibration energy. When the flange plate 3 vibrates due to the vehicle load, the viscoelastic material in the damper 1 generates shear stress, converting mechanical energy into heat energy, thereby reducing vibration. The lower connecting rod 6 and the rib rod 7 transmit the reaction force of the damper 1 to the web 4. Since the connection points of the lower connecting rod 6 and the rib rod 7 with the web 4 are all hinged, the direct impact on the web 4 can be further reduced, and the force can be dispersed to a larger structural area through the web 4, thereby reducing local stress.

[0025] When the wind load causes the flange plate 3 to vibrate, it may cause the flange plate to twist laterally, affecting the stability and safety of the bridge. However, in the present invention, the vibration of the flange plate 3 is transmitted to the damper 1, and the viscoelastic material in the damper 1 starts to work, absorbing and consuming the vibration energy caused by the wind load. The characteristics of this material enable it to provide a larger damping force at a higher vibration frequency, thereby effectively reducing the vibration. The lower connecting rod 6 and the rib rod 7 transmit the reaction force of the damper 1 to the web 4, and these forces can be more evenly dispersed in the internal structure of the box girder, reducing local stress concentration, thereby reducing the impact of vortex-induced vibration on the bridge structure.

[0026] The shock absorbing device of the present invention provides a new bridge design concept. By arranging multiple dampers 1 between the flange plate 3 and the web 4, the vibration of the flange plate 3 is directly controlled, the vibration energy caused by traffic load and wind load is effectively absorbed and dissipated, the lateral torsion of the flange plate 3 is reduced, and the stability and safety of the bridge structure are improved. At the same time, the aerodynamic performance is optimized, the influence of vortex-induced vibration is reduced, the walking comfort of pedestrians is improved, and the service life of the bridge is extended. It has significant practical value and social benefits.

[0027] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck, characterized in that: include: A damper (1) is used to connect a flange plate (3) and a web plate (4) on the same side of a box girder (2); The dampers (1) are multiple in number and are arranged at intervals along the extension direction of the box beam (2).

2. The shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck according to claim 1 is characterized in that: The upper end of the damper (1) is connected to the flange plate (3) via an upper connecting rod (5), and the lower end is connected to the web plate (4) via a lower connecting rod (6).

3. The shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck according to claim 2 is characterized in that: The upper connecting rod (5) is connected to the bottom end surface of the flange plate (3) and is close to the outer edge of the flange plate (3); the lower connecting rod (6) is connected to the outer side surface of the web plate (4) and is close to the bottom edge of the web plate (4).

4. The shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck according to claim 3 is characterized in that: The lower end of the damper (1) is also connected to a rib rod (7), and the upper end of the rib rod (7) is connected to the outer side surface of the web (4) and is close to the top edge of the web (4).

5. The shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck according to claim 4 is characterized in that: The damper is a viscoelastic damper.

6. A box girder bridge, characterized in that: A shock absorbing device for suppressing lateral torsion of the bridge deck and improving walking comfort on the bridge deck is provided as described in any one of claims 1 to 5.

7. The box girder bridge according to claim 6, characterized in that: A sidewalk is provided on the edge of the flange plate (3).

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