Vortex-induced vibration suppression structure of split double-box girder

Abstract

The utility model relates to the technical field of bridge engineering, and discloses a vortex-induced vibration suppression structure of a split double-box girder, the split double-box girder comprises two box girders which are symmetrically arranged in the transverse bridge direction, a plurality of transverse connecting beams which are arranged at intervals in the bridge direction are arranged between the two box girders, and an open groove is formed between every two adjacent transverse connecting beams; and horizontal baffles extending towards the centers of the grooves along the transverse bridge direction are arranged on the box girders on the two sides of each groove. According to the split double-box girder, the horizontal baffles extending in the transverse bridge direction are arranged on the box girders on the two sides of each groove at the same time, vortexes at the grooves of the split double-box girder can be disorganized through the horizontal baffles, the air streaming characteristic at the grooves is changed, and therefore vortex-induced vibration possibly generated by the split double-box girder can be effectively restrained, and the service life of the split double-box girder is prolonged. And therefore, the vortex-induced vibration performance of the split double-box girder is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, and more specifically, to a structure for suppressing vortex-induced vibration of a split double box girder. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] For slotted split double box girders, they have been widely used in long-span bridges due to their good flutter performance.

[0004] However, the presence of slots worsens the vortex-induced vibration performance of the split-type double box girder. Vortex-induced vibration, simply put, is a type of forced vibration with self-excited characteristics that occurs within a low wind speed range. When the amplitude of vortex-induced vibration generated by the split-type double box girder is large, it can affect driving safety and passenger comfort, and prolonged vibration can also cause structural fatigue failure. Therefore, there is an urgent need for measures to effectively suppress the vortex-induced vibration that may occur in split-type double box girders. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a vortex-induced vibration suppression structure for a split double box girder, in order to effectively suppress the vortex-induced vibration that may occur in the split double box girder, thereby effectively improving the vortex-induced vibration performance of the split double box girder.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model discloses a vortex-induced vibration suppression structure for a split double box girder. The split double box girder includes two box girders symmetrically arranged in the transverse direction. A plurality of transverse connecting beams spaced apart in the longitudinal direction are provided between the two box girders, and a slot is formed between two adjacent transverse connecting beams.

[0008] The vortex-induced vibration suppression structure includes a horizontal baffle;

[0009] Each of the box girders located on both sides of each slot is provided with a horizontal baffle extending towards the center of the slot in the transverse direction of the bridge, and the length of each horizontal baffle in the longitudinal direction of the bridge is equal to the length of the slot in the longitudinal direction of the bridge.

[0010] Furthermore, the width of each of the horizontal baffles along the transverse bridge direction is equal to 18.75% to 25.00% of the width of the slot along the transverse bridge direction.

[0011] Furthermore, the top surface of each of the horizontal baffles is in the same horizontal plane as the top surface of the corresponding box girder.

[0012] Furthermore, each of the horizontal baffles is provided with a support member at its bottom, the support member being configured to support the horizontal baffle from the bottom of the corresponding horizontal baffle.

[0013] Furthermore, the supporting member and the corresponding box girder, as well as the supporting member and the corresponding horizontal baffle, can be detachably connected.

[0014] Furthermore, the supporting member includes a vertical connecting part, a horizontal connecting part, and reinforcing ribs, wherein the vertical connecting part is detachably connected to the corresponding box girder;

[0015] The horizontal connecting part is connected to the vertical connecting part, and the horizontal connecting part is detachably connected to the corresponding horizontal baffle; the reinforcing rib is disposed between the vertical connecting part and the horizontal connecting part.

[0016] Furthermore, a first vertical connection hole is provided on the vertical connection part, and a second vertical connection hole is provided on the side of the box beam facing the slot, which corresponds to and is adapted to the first vertical connection hole.

[0017] Furthermore, the horizontal connecting part is provided with a vertically extending connecting post with external threads, and the corresponding horizontal baffle is provided with a horizontal connecting hole that corresponds to and fits the connecting post.

[0018] Furthermore, there are multiple supporting members located at the bottom of each of the horizontal baffles, and the multiple supporting members are spaced apart along the bridge direction.

[0019] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0020] The vortex-induced vibration suppression structure disclosed in this utility model utilizes horizontal baffles extending transversely along the bridge direction, simultaneously installed on the box girders on both sides of each slot. These baffles shield the portion of the slots near the box girders, thus ensuring airflow can penetrate the slots to maintain good flutter performance of the split double box girders. Simultaneously, the horizontal baffles disrupt the vortices at the slots, altering the airflow characteristics and effectively suppressing potential vortex-induced vibrations in the split double box girders, thereby significantly improving their vortex-induced vibration performance. Furthermore, the vortex-induced vibration suppression structure disclosed in this utility model is simple in design and easy to implement. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of the split double box girder provided for an embodiment of this utility model;

[0022] Figure 2A schematic diagram of the split double box girder and the vortex-induced vibration suppression structure provided for an embodiment of this utility model;

[0023] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the split double box girder and the vortex-induced vibration suppression structure.

[0024] Figure 4 for Figure 3 Enlarged view of the local structure at point A;

[0025] Figure 5 A schematic diagram of the structure of the support member provided in an embodiment of this utility model;

[0026] Figure 6 The graph shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder without the vortex-induced vibration suppression structure disclosed in this utility model under the conditions of -3°, 0°, +3° wind angle of attack, uniform flow, and damping ratio of 0.25%.

[0027] Figure 7 The graph shows the relationship between the amplitude of torsional vortex-induced vibration and wind speed for a split double box girder without the vortex-induced vibration suppression structure disclosed in this utility model, under conditions of -3°, 0°, +3° wind angle of attack, uniform flow, and a damping ratio of 0.25%.

[0028] Figure 8 The graph shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder equipped with the vortex-induced vibration suppression structure disclosed in this utility model, where the width of the horizontal baffle along the transverse bridge direction is equal to 25.00% of the width of the slot along the transverse bridge direction, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and a damping ratio of 0.25%.

[0029] Figure 9 The graph shows the relationship between the amplitude of torsional vortex-induced vibration and wind speed of a split double box girder equipped with the vortex-induced vibration suppression structure disclosed in this utility model, where the width of the horizontal baffle along the transverse direction of the bridge is equal to 25.00% of the width of the slot along the transverse direction of the bridge, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and damping ratio of 0.25%.

[0030] Figure 10 The graph shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder equipped with the vortex-induced vibration suppression structure disclosed in this utility model, where the width of the horizontal baffle along the transverse bridge direction is equal to 18.75% of the width of the slot along the transverse bridge direction, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and a damping ratio of 0.25%.

[0031] Figure 11The graph shows the relationship between the amplitude of torsional vortex-induced vibration and wind speed of a split double box girder equipped with the vortex-induced vibration suppression structure disclosed in this utility model, where the width of the horizontal baffle along the transverse direction of the bridge is equal to 18.75% of the width of the slot along the transverse direction of the bridge, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and a damping ratio of 0.25%.

[0032] Icons: 10-Horizontal baffle, 20-Supporting component, 21-Vertical connection part, 211-First vertical connection hole, 22-Horizontal connection part, 221-Connecting column, 23-First fastener, 24-Second fastener, 25-Reinforcing rib, 100-Split double box girder, 101-Box girder, 102-Transverse connecting beam, 103-Slotted. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0035] An embodiment of this utility model discloses a vortex-induced vibration suppression structure for a split double box girder 100, which is expected to effectively suppress the vortex-induced vibration that may occur in the split double box girder 100, thereby effectively improving the vortex-induced vibration performance of the split double box girder 100.

[0036] like Figure 1 As shown, it illustrates the general structure of the exemplary split double box girder 100 disclosed in this embodiment. The structure of the split double box girder 100 is also a structure that a split double box girder 100 may have in the prior art.

[0037] exist Figure 1 The split double box girder 100 shown may include two box girders 101 symmetrically arranged in the transverse direction. A plurality of transverse connecting beams 102 spaced apart in the longitudinal direction may be further provided between the two box girders 101, and a slot 103 is formed between adjacent transverse connecting beams 102. It should be noted that this embodiment includes... Figure 1 The diagram only shows a partial structure of the split double box girder 100. For example, the two box girders 101 of the split double box girder 100 can continue to extend along the longitudinal direction of the bridge, and there can be more transverse connecting beams 102 between the two box girders 101.

[0038] Based on this, in order to effectively suppress the vortex-induced vibration that may be generated by such a split double box girder 100, the vortex-induced vibration suppression structure disclosed in this embodiment may include a horizontal baffle 10.

[0039] Combination Figure 2 As shown, each box girder 101 located on both sides of each slot 103 is provided with a horizontal baffle 10 extending towards the center of the slot 103 in the transverse direction. The length of each horizontal baffle 10 in the longitudinal direction can be equal to the length of the slot 103 in the longitudinal direction, that is, the length of each horizontal baffle 10 in the longitudinal direction can be equal to the distance between two adjacent transverse connecting beams 102.

[0040] It is understood that the vortex-induced vibration suppression structure disclosed in this embodiment, by simultaneously setting horizontal baffles 10 extending along the transverse direction on the box girders 101 located on both sides of each slot 103, can shield the portion of the slot 103 near the box girders 101. Thus, while ensuring that wind can penetrate the slots 103 to give the split double box girder 100 good flutter performance, the horizontal baffles 10 can disrupt the vortices at the slots 103 of the split double box girder 100, changing the airflow characteristics at the slots 103, thereby effectively suppressing the vortex-induced vibration that may occur in the split double box girder 100, and thus effectively improving the vortex-induced vibration performance of the split double box girder 100. Furthermore, the vortex-induced vibration suppression structure disclosed in this embodiment is simple in structure and easy to implement.

[0041] In some embodiments of this utility model, the width of each horizontal baffle 10 along the transverse direction of the bridge can be equal to 18.75% to 25.00% of the width of the slot 103 along the transverse direction of the bridge. It is understood that by limiting the width of each horizontal baffle 10 along the transverse direction of the bridge, the split double box girder 100 can have good flutter performance while ensuring that the vortex-induced vibration suppression structure has a good vortex-induced vibration suppression effect, and the size of the horizontal baffle 10 can be reduced as much as possible. This is beneficial to optimizing the structural design of the vortex-induced vibration suppression structure and reducing costs and material consumption.

[0042] In some embodiments of this utility model, the top surface of each horizontal baffle 10 can be in the same horizontal plane as the top surface of the corresponding box girder 101 (i.e., the bridge deck) to further optimize the structural design of the split double box girder 100 with vortex-induced vibration suppression structure.

[0043] Combination Figure 3As shown, each horizontal baffle 10 is further provided with a support member 20 at its bottom. The support member 20 is configured to support the horizontal baffle 10 from its bottom. By providing the support member 20 to support the horizontal baffle 10 from its bottom, the installation of the horizontal baffle 10 is facilitated, and the structural stability of the horizontal baffle 10 is improved.

[0044] In this embodiment, there may be multiple supporting members 20 located at the bottom of each horizontal baffle 10, and these multiple supporting members 20 may be spaced apart along the bridge direction. This helps to further improve the structural stability of the horizontal baffle 10. For example, the appendix of this embodiment... Figure 3 The diagram shows a case where three support members 20 are provided at the bottom of each horizontal baffle 10, spaced apart along the longitudinal direction of the bridge.

[0045] Furthermore, the support member 20 is detachably connected to the corresponding box girder 101, and also detachably connected to the corresponding horizontal baffle 10. This detachable connection between the support member 20 and the corresponding box girder 101 facilitates the convenient installation of the support member 20 on the side of the box girder 101 facing the slot 103, and also makes replacement of the support member 20 easier. Simultaneously, the detachable connection between the support member 20 and the horizontal baffle 10 allows for replacement of the horizontal baffle 10 without removing the support member 20 from the box girder 101.

[0046] The support member 20 may be constructed in a manner described below, but is not limited to, so as to achieve a detachable connection between the support member 20 and the box girder 101 and the horizontal baffle 10, and to enable the support member 20 to provide more reliable support for the horizontal baffle 10.

[0047] like Figure 4 and Figure 5 As shown, the support member 20 can be a generally L-shaped member. The support member 20 may include a vertical connecting portion 21 and a horizontal connecting portion 22 connected to the vertical connecting portion 21. The vertical connecting portion 21 is used for detachable connection with the corresponding box girder 101. For example, a first vertical connecting hole 211 can be provided on the vertical connecting portion 21, and a second vertical connecting hole (not shown in the figure) corresponding to and adapted to the first vertical connecting hole 211 can be provided on the side of the corresponding box girder 101 facing the slot 103, so that the vertical connecting portion 21 can be detachably connected to the box girder 101 by means of a first fastener 23 such as a fastening bolt.

[0048] The horizontal connecting part 22 is detachably connected to the corresponding horizontal baffle 10. For example, a vertically extending connecting post 221 (e.g., a screw) with external threads can be provided on the horizontal connecting part 22, and a horizontal connecting hole (not shown in the figure) corresponding to and adapted to the connecting post 221 can be opened on the corresponding horizontal baffle 10. This allows the connecting post 221 on the horizontal connecting part 22 to pass through the corresponding horizontal connecting hole on the horizontal baffle 10, and when the connecting post 221 passes through the corresponding horizontal connecting hole, the horizontal connecting part 22 and the horizontal baffle 10 can be fastened together by means of a second fastener 24 such as a fastening nut.

[0049] Meanwhile, the support member 20 may also include a reinforcing rib 25 disposed between the vertical connecting portion 21 and the horizontal connecting portion 22. By providing the reinforcing rib 25, the support member 20 can provide more reliable support for the horizontal baffle 10, thereby effectively improving the structural stability of the horizontal baffle 10.

[0050] To more clearly and intuitively demonstrate the effect of the vortex-induced vibration suppression structure disclosed in this embodiment on suppressing the vortex-induced vibration that may occur in the split double box girder 100, segmental model wind tunnel tests were conducted on both the split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment and the split double box girder 100 with the vortex-induced vibration suppression structure disclosed in this embodiment. The relationships between the vertical vortex-induced vibration amplitude (hereinafter referred to as "vertical vortex vibration amplitude"), the torsional vortex-induced vibration amplitude (hereinafter referred to as "torsional vortex vibration amplitude"), and the wind speed were obtained for the two types of split double box girder 100. During the test, the angle of attack of the incoming wind was considered positive when the incoming wind was blowing towards the bottom plate of the box girder 101, and negative when it was blowing towards the bridge deck of the box girder 101.

[0051] like Figure 6 and Figure 7 As shown, Figure 6 The graph shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment under the conditions of -3°, 0°, +3° wind angle of attack, uniform flow, and damping ratio of 0.25%. Figure 7 The graph shows the relationship between the amplitude of torsional vortex-induced vibration and wind speed of a split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment, under conditions of -3°, 0°, +3° wind angle of attack, uniform flow, and a damping ratio of 0.25%.

[0052] Combination Figure 6As shown in the results, experiments revealed that at wind angles of attack of -3°, 0°, and +3°, the vertical vortex-induced vibration locking wind speed range for the split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment was 7.0–9.5 m / s, with corresponding maximum vertical vortex-induced vibration amplitudes of 135.4 mm, 138.6 mm, and 96.2 mm, respectively. Combined with… Figure 7 As shown, at wind attack angles of -3°, 0°, and +3°, the torsional vortex-induced vibration locking wind speed range for the split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment is 25.0 to 30.0 m / s, and the corresponding maximum amplitudes of torsional vortex-induced vibration are 0.13°, 0.18°, and 0.02°, respectively.

[0053] like Figure 8 and Figure 9 As shown, Figure 8 The diagram shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder 100 equipped with the vortex-induced vibration suppression structure disclosed in this embodiment, and with the width of the horizontal baffle 10 along the transverse direction being equal to 25.00% of the width of the slot 103 along the transverse direction, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and a damping ratio of 0.25%.

[0054] Figure 9 The diagram shows the relationship between the torsional vortex-induced vibration amplitude and wind speed of a split double box girder 100 equipped with the vortex-induced vibration suppression structure disclosed in this embodiment, and with the width of the horizontal baffle 10 along the transverse direction being equal to 25.00% of the width of the slot 103 along the transverse direction, under the conditions of -3°, 0°, +3° wind attack angles, uniform flow, and a damping ratio of 0.25%.

[0055] Combination Figure 8 and Figure 9 As shown in the figure, the experiment found that after adopting the vortex-induced vibration suppression structure disclosed in this embodiment, the vertical vortex-induced vibration and torsional vortex-induced vibration of the split double box girder 100 basically disappeared completely when the damping ratio was 0.25%.

[0056] To further verify the effect of the vortex-induced vibration suppression structure disclosed in this embodiment on suppressing the vortex-induced vibration that may occur in the split double box girder 100. For example... Figure 10 and Figure 11 As shown, Figure 10 The diagram shows the relationship between the vertical vortex-induced vibration amplitude and wind speed of a split double box girder 100 equipped with the vortex-induced vibration suppression structure disclosed in this embodiment, and with the width of the horizontal baffle 10 along the transverse bridge direction being equal to 18.75% of the width of the slot 103 along the transverse bridge direction, under the conditions of -3°, 0°, +3° wind attack angle, uniform flow, and a damping ratio of 0.25%. Figure 11The diagram shows the relationship between the torsional vortex-induced vibration amplitude and wind speed of a split double box girder 100 equipped with the vortex-induced vibration suppression structure disclosed in this embodiment, and with the width of the horizontal baffle 10 along the transverse direction being equal to 18.75% of the width of the slot 103 along the transverse direction, under the conditions of -3°, 0°, +3° wind attack angles, uniform flow, and a damping ratio of 0.25%.

[0057] Combination Figure 10 As shown, at wind angles of attack of 0° and -3°, the maximum amplitude of vertical vortex-induced vibration of the split double box girder 100 decreased from 138.6 mm and 135.4 mm to 50.0 mm and 17.7 mm, respectively. Compared with the split double box girder 100 without the vortex-induced vibration suppression structure disclosed in this embodiment, the maximum amplitude of vertical vortex-induced vibration decreased by 64% and 87%, respectively, indicating that the vortex-induced vibration suppression structure disclosed in this embodiment has a good suppression effect on the vertical vortex-induced vibration of the split double box girder 100. Meanwhile, combined with... Figure 11 As can be seen from the content shown, the split double box girder 100 equipped with the vortex-induced vibration suppression structure disclosed in this embodiment basically did not experience torsional vortex-induced vibration.

[0058] In summary, the vortex-induced vibration suppression structure disclosed in this embodiment can effectively suppress the vortex-induced vibration that may occur in the split double box girder 100, thereby improving the vortex-induced vibration performance of the split double box girder 100.

[0059] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vortex-induced vibration suppression structure for a split double-box girder, wherein the split double-box girder comprises two box girders symmetrically arranged in the transverse direction, and a plurality of transverse connecting beams spaced apart in the longitudinal direction are provided between the two box girders, with a slot formed between adjacent transverse connecting beams, characterized in that, The vortex-induced vibration suppression structure includes a horizontal baffle; Each of the box girders located on both sides of each slot is provided with a horizontal baffle extending towards the center of the slot in the transverse direction of the bridge, and the length of each horizontal baffle in the longitudinal direction of the bridge is equal to the length of the slot in the longitudinal direction of the bridge.

2. The vortex-induced vibration suppression structure for a split double box girder according to claim 1, characterized in that, The width of each horizontal baffle along the transverse bridge direction is equal to 18.75% to 25.00% of the width of the slot along the transverse bridge direction.

3. The vortex-induced vibration suppression structure for a split double box girder according to claim 1, characterized in that, The top surface of each of the horizontal baffles is in the same horizontal plane as the top surface of the corresponding box girder.

4. The vortex-induced vibration suppression structure for a split double box girder according to claim 1, characterized in that, Each of the horizontal baffles has a support member at its bottom, and the support member is configured to support the horizontal baffle from the bottom of the corresponding horizontal baffle.

5. The vortex-induced vibration suppression structure for a split double box girder according to claim 4, characterized in that, The supporting member and the corresponding box girder, as well as the supporting member and the corresponding horizontal baffle, can be detachably connected.

6. The vortex-induced vibration suppression structure for a split double box girder according to claim 5, characterized in that, The supporting member includes a vertical connecting part, a horizontal connecting part, and reinforcing ribs, and the vertical connecting part is detachably connected to the corresponding box girder; The horizontal connecting part is connected to the vertical connecting part, and the horizontal connecting part is detachably connected to the corresponding horizontal baffle; the reinforcing rib is disposed between the vertical connecting part and the horizontal connecting part.

7. The vortex-induced vibration suppression structure for a split double box girder according to claim 6, characterized in that, The vertical connecting part is provided with a first vertical connecting hole, and the corresponding box beam is provided with a second vertical connecting hole on the side facing the slot, which corresponds to and is adapted to the first vertical connecting hole.

8. The vortex-induced vibration suppression structure for a split double box girder according to claim 6, characterized in that, The horizontal connecting part is provided with a vertically extending connecting post with external threads, and the corresponding horizontal baffle is provided with a horizontal connecting hole that corresponds to and fits the connecting post.

9. The vortex-induced vibration suppression structure for a split double box girder according to claim 4, characterized in that, The supporting members located at the bottom of each of the horizontal baffles are multiple, and the multiple supporting members are spaced apart along the bridge direction.

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