Pneumatic device for controlling vortex vibration of Pi-shaped superposed beam bridge

Abstract

The invention relates to a pneumatic device for vortex vibration control of a pi-shaped superposed beam bridge. The method is suitable for the technical field of bridge wind-resistant engineering. The technical problem to be solved by the invention is to provide the pneumatic device for controlling vortex vibration of the pi-shaped superposed beam bridge. According to the technical scheme, the pneumatic device for controlling vortex vibration of the pi-shaped superposed beam bridge is arranged on a bridge deck bottom plate of a superposed beam and is provided with at least one wave-shaped stabilizing plate; the length direction of the wave-shaped stabilizing plate is parallel to the axis direction of the bridge, the upper end of the wave-shaped stabilizing plate is fixed on a bottom plate of the bridge deck, and the lower edge of the wave-shaped stabilizing plate is wave-shaped.

Description

Technical Field

[0001] The present invention relates to a pneumatic device for controlling vortex vibration of a π-shaped composite beam bridge, which is applicable to the field of wind-resistant bridge engineering. Background Art

[0002] Composite-beam bridges are widely used due to their structural economy and ease of construction. However, their open, non-streamlined cross-section design makes it easy for airflow to form vortices and flow separation. This aerodynamic effect can excite vibrations in the bridge structure, leading to vortex-induced vibrations. Furthermore, the structural complexity and low torsional stiffness of composite-beam bridges inevitably negatively impact their wind resistance.

[0003] Wind stability, as one of the core indicators for measuring the safety and durability of bridge structures, becomes increasingly important as bridge spans increase, becoming an indispensable key control factor in the design of long-span bridges. Therefore, taking effective measures to improve the wind stability of bridge structures has important practical significance and engineering value.

[0004] In the existing technology, a stabilizing plate is often provided on the bottom plate of the bridge deck to improve the wind resistance of the bridge structure. However, the traditional rectangular stabilizing plate has a consistent shape along the longitudinal direction of the main beam. Therefore, the vortex shedding generated at the stabilizing plate along the longitudinal direction of the main beam is consistent in form. The vortex shedding with consistent form can easily generate consistent, stable and regular aerodynamic forces, thereby causing vortex-induced vibration of the π-type composite beam. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in view of the above-mentioned problems, a pneumatic device for vortex vibration control of a π-type composite beam bridge is provided.

[0006] The technical solution adopted by the present invention is: a pneumatic device for vortex vibration control of a π-shaped composite beam bridge, the pneumatic device is arranged on the bottom plate of the composite beam bridge deck and has at least one wavy stabilizing plate; The length direction of the wavy stabilizing plate is arranged parallel to the axis direction of the bridge. The upper end of the wavy stabilizing plate is fixed to the bottom plate of the bridge deck, and the lower edge of the wavy stabilizing plate is wavy.

[0007] The total height of the wavy stabilizing plate is L=(0.35~0.5)*H, where H is the height of the main longitudinal beam of the composite beam; The wave height of the wavy lower edge of the wavy stabilizing plate is X=(0.6~0.85)*L, and the wavelength is Y=(0.65~0.9)*L.

[0008] The wave-shaped stabilizing plate is arranged at the center position of the bridge deck bottom plate.

[0009] The wave-shaped stabilizing plate is arranged at the left and right 1 / 4 of the center of the bridge deck bottom plate.

[0010] The wave-shaped stabilizing plate is arranged at the center position of the bridge deck bottom plate and at the left and right 1 / 4 of the center.

[0011] The length of the wavy stabilizing plate is the same as the length of the composite beam in the axial direction of the bridge.

[0012] A composite beam is provided with the pneumatic device.

[0013] A bridge comprises the composite beam.

[0014] The beneficial effects of the present invention are as follows: the present invention abandons the traditional rectangular lower stabilizing plate and adopts a wave-type lower stabilizing plate, thereby improving the open blunt body characteristics of the π-type composite beam, alleviating the formation of vortices at the bottom of the beam from the root, thereby reducing the vortex vibration amplitude of the structure, and further improving the wind resistance stability of the beam body.

[0015] Compared with the traditional rectangular lower stabilizer plate, the aerodynamic optimization structure adopted in this patent significantly reduces the weight of the stabilizer plate. On the basis of ensuring the safety, stability and normal operation functions of the bridge structure are not affected, it reduces the dead weight of the additional measures, thereby improving the overall economy and cost-effectiveness of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the layout of the pneumatic device in Example 1.

[0017] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0018] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0019] Figure 4 Schematic diagram of the structure of the wave-shaped stabilizing plate in Example 1.

[0020] Figure 5 This is a schematic diagram of the layout of the pneumatic device in Example 2.

[0021] Figure 6 This is a schematic diagram of the layout of the pneumatic device in Example 3.

[0022] 1. Bridge deck bottom plate; 2. Wave-shaped stabilizer plate; 3. Main longitudinal beam. DETAILED DESCRIPTION

[0023] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0026] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0027] Example 1: Figures 1-3 As shown, this embodiment is a pneumatic device for vortex vibration control of a π-type composite beam bridge. The pneumatic device is arranged on the bottom plate of the bridge deck of the composite beam and has three wavy stabilizing plates, one of which is arranged on the center line of the bottom plate of the bridge deck, and the other two stabilizing plates are symmetrically arranged at two locations on the center line of the bottom plate of the bridge deck, with one being arranged at a distance of 1 / 4 from the left and right.

[0028] In this embodiment, the length direction of the corrugated stabilizing plate is arranged parallel to the axial direction of the bridge, and the length of the corrugated stabilizing plate is the same as the length of the composite beam in the axial direction of the bridge.

[0029] like Figure 4 As shown, in this example, the upper end of the wavy stabilizing plate is connected to the bottom plate of the bridge deck of the composite beam by riveting, bolting or welding, and the lower edge of the wavy stabilizing plate is wavy. The total height of the wavy stabilizing plate is L = (0.35~0.5) * H, where H is the height of the I-shaped main longitudinal beam of the composite beam; the wave height of the wavy lower edge of the stabilizing plate is X = (0.6~0.85) * L, and the wavelength is Y = (0.65~0.9) * L, where L is the total height of the lower central wavy stabilizing plate (2).

[0030] Example 2: This example has a structure similar to that of Example 1, except that in this example, a wave-shaped stabilizing plate (e.g. Figure 5 shown).

[0031] Example 3: This example has a structure similar to that of Example 1, except that in this example, two wave-shaped stabilizing plates are arranged symmetrically about the center line of the bridge deck bottom plate, one plate is arranged at a distance of 1 / 4 from the left and right (see Figure 6 ).

[0032] The following is a comparative test to prove that the present invention can improve the wind resistance stability of the bridge structure: A π-shaped composite beam segment model without a pneumatic device was tested for VIR amplitude at multiple attack angles with a 0.5% damping ratio. Table 1 shows the VIR test results for the π-shaped composite beam bridge before the aerodynamic device was added.

[0033] Table 1 Results of vortex-induced resonance test without measures Wind attack angle -3° 0° +3° Vortex vibration amplitude (mm) 311 246 279 A pneumatic device is installed on the main beam of the π-shaped composite beam, where the height of the I-shaped main longitudinal beam is 1.8m; the wave height of the lower central wavy stabilizing plate is 0.5m, the wavelength is 0.7m, and the total height is 0.8m; the width of the bottom plate of the π-shaped composite beam is 23m, which is 1 / 4 of the width of the bottom plate of the steel box beam. Therefore, the distance between the lower wavy stabilizing plate and the center line of the beam bottom plate is 5.75m, and the lower wavy stabilizing plate is arranged symmetrically with the center line of the beam bottom plate as the axis. The wave height of the lower wavy stabilizing plate is 0.5m, the wavelength is 0.7m, and the total height is 0.8m; the vortex-induced resonance amplitude value test at multiple attack angles of the main beam is carried out respectively, and the results are shown in the following table: Table 2 Test results of vortex-induced resonance with aerodynamic measures for wave-shaped stabilizer plates

[0034] Test conclusion: The π-type composite beam without aerodynamic measures exhibits obvious vortex-induced vibration at all wind attack angles; a lower central wavy stabilization plate and a wavy lower stabilization plate are respectively set on the main beam. The test results show that both can effectively suppress the vortex-induced vibration amplitude of the main beam structure. It can be seen that the aerodynamic measures described in the present invention can improve the vortex-induced vibration performance of the π-type composite beam bridge.

[0035] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A pneumatic device for vortex vibration control of a π-type composite beam bridge, characterized in that: The moving device is arranged on the bottom plate of the bridge deck of the composite beam and has at least one wavy stabilizing plate; The length direction of the wavy stabilizing plate is arranged parallel to the axis direction of the bridge. The upper end of the wavy stabilizing plate is fixed to the bottom plate of the bridge deck, and the lower edge of the wavy stabilizing plate is wavy.

2. The pneumatic device for vortex vibration control of a π-type composite beam bridge according to claim 1 is characterized in that: The total height of the wavy stabilizing plate is L=(0.35~0.5)*H, where H is the height of the main longitudinal beam of the composite beam; The wave height of the wavy lower edge of the wavy stabilizing plate is X=(0.6~0.85)*L, and the wavelength is Y=(0.65~0.9)*L.

3. The pneumatic device for vortex vibration control of a π-type composite beam bridge according to claim 1 is characterized in that: The wave-shaped stabilizing plate is arranged at the center position of the bridge deck bottom plate.

4. The pneumatic device for vortex vibration control of a π-type composite beam bridge according to claim 1 is characterized in that: The wave-shaped stabilizing plate is arranged at the left and right 1 / 4 of the center of the bridge deck bottom plate.

5. The pneumatic device for vortex vibration control of a π-type composite beam bridge according to claim 1 is characterized in that: The wave-shaped stabilizing plate is arranged at the center position of the bridge deck bottom plate and at the left and right 1 / 4 of the center.

6. The pneumatic device for vortex vibration control of a π-type composite beam bridge according to claim 1, characterized in that: The length of the wavy stabilizing plate is the same as the length of the composite beam in the axial direction of the bridge.

7. A composite beam, characterized in that: A pneumatic device according to any one of claims 1 to 6.

8. A bridge, characterized in that: A composite beam according to claim 7.

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