Slotted box girder for improving vortex vibration performance

Abstract

The invention discloses a slotted box girder for improving vortex vibration performance, which comprises at least two box girders arranged at intervals along the transverse bridge direction, the box girders extend along the bridge direction, and a slot is formed in the interval between the adjacent box girders; the handrail assembly comprises an outer handrail piece and inner handrail pieces, the outer handrail piece is arranged on the outer side of the top of the box girder, the inner handrail pieces are arranged on the top of the box girder and located on the two sides of the open groove, each inner handrail piece comprises a plurality of stand columns arranged at intervals in the bridge direction and a plurality of transverse handrails fixedly connected to the stand columns, and the transverse handrails are arranged at intervals in the vertical direction; and the vortex vibration suppression plate is arranged at the top of the inner handrail piece, extends out of the inner handrail piece and is arranged towards the open groove. Vortex-induced vibration is effectively suppressed by arranging the vortex-induced vibration suppression plates on the two sides of the slotted box girder to change the streaming form around the slotted box girder; and the vortex-induced vibration suppression plate has smaller mass and volume, so that the static load and the cost of the box girder structure are not obviously increased, and the vortex-induced vibration suppression plate is convenient to mount and maintain and has better environmental protection property and economical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly relates to a slotted box girder for improving vortex-induced vibration performance. Background Art

[0002] Long-span bridge structures have large flexibility and low damping, are more sensitive to wind, and are more prone to wind-induced vibration problems. Vortex-induced vibration (referred to as vortex vibration for short) is a kind of wind-induced vibration caused by periodically shedding vortices when air flows through the bridge cross-section, and usually occurs within a relatively low wind speed range. Vortex-induced vibration generally does not directly cause damage to the bridge structure, but may affect the comfort and safety of vehicle driving on the bridge deck. Frequent vortex vibrations may also reduce the fatigue life of the bridge structure or components, or lead to traffic closure, causing economic losses.

[0003] The slotted box girder is a typical type of bridge main girder structure and is widely used in the construction of modern long-span bridges due to its excellent flutter performance. Compared with more traditional streamlined closed box girders, the flow field around the cross-section of the slotted box girder is more complex and more prone to vortex vibration. Large-span bridges such as the Xihoumen Bridge in China and the Yi Sun-sin Bridge in South Korea, which typically use slotted box girders as main girders, have all experienced large-amplitude vortex vibrations. It is of great significance to find appropriate measures to suppress the vortex vibration of slotted box girders.

[0004] Currently, the commonly used vortex vibration control measures can be roughly divided into two categories: mechanical measures and aerodynamic measures. Mechanical measures can often only suppress a certain order of vortex vibration and have a high cost; aerodynamic measures are usually more suitable for controlling multi-order vortex vibrations of long-span bridges. For slotted box girders, aerodynamic measures such as installing grilles or slot covers at the slots are often used to suppress vortex vibration. The slot width of large-span slotted box girders can reach several meters, and the grilles or slot covers used to suppress vortex vibration often have a large volume and mass, resulting in a large amount of engineering work, which will greatly increase the static load and cost of the bridge, and it is also more difficult to maintain and replace the grilles or slot covers; in addition, when vortex vibration occurs in an already built slotted bridge, the existing vortex vibration control structures cannot be quickly installed, resulting in untimely disposal. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a slotted box girder for improving vortex-induced vibration performance.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A slotted box girder for improving vortex-induced vibration performance, comprising:

[0008] At least two box girders spaced apart along the transverse direction of the bridge, the box girders extending along the longitudinal direction of the bridge, and the interval between adjacent box girders forms a slot;

[0009] Rail component, the rail component includes an outer rail member and an inner rail member. The outer rail member is arranged on the outer side of the top of the box girder, and the inner rail member is arranged on the top of the box girder and on both sides of the slot. The inner rail member includes a plurality of upright columns arranged at intervals along the bridge longitudinal direction and a plurality of transverse rails fixedly connected to the plurality of upright columns. The plurality of transverse rails are arranged at intervals in the vertical direction;

[0010] Vortex-induced vibration suppression plate member, the vortex-induced vibration suppression plate member is arranged on the top of the inner rail member, and the vortex-induced vibration suppression plate member extends out of the inner rail member and faces the slot.

[0011] As a further improvement of the present invention, the vortex-induced vibration suppression plate member is fixed to the uppermost transverse rail through a first connecting member, and / or the vortex-induced vibration suppression plate member is fixed to the top of the upright column through a second connecting member.

[0012] As a further improvement of the present invention, the first connecting member includes a plurality of connecting clamps, and each connecting clamp is clamped on the vortex-induced vibration suppression plate member and the uppermost transverse rail.

[0013] As a further improvement of the present invention, the connecting clamp includes a first clamp portion and a second clamp portion connected to each other. A part of the first clamp portion is attached to one side of the vortex-induced vibration suppression plate member facing the slot, another part of the first clamp portion is attached to the outer periphery of the uppermost transverse rail, a part of the second clamp portion is attached to the outer periphery of the uppermost transverse rail, another part of the second clamp portion is attached to the other side of the vortex-induced vibration suppression plate member, a part of the first clamp portion, the vortex-induced vibration suppression plate member, and another part of the second clamp portion are fixedly connected, and another part of the first clamp portion is fixedly connected to a part of the second clamp portion.

[0014] As a further improvement of the present invention, the connecting clamp further includes a third clamp portion, and the third clamp portion is attached to the other side of the vortex-induced vibration suppression plate member and fixedly connected to a part of the first clamp portion.

[0015] As a further improvement of the present invention, the second connecting member includes a plurality of connecting blocks, and each connecting block is tightly attached and fixed to the top surface of the upright column and one side of the vortex-induced vibration suppression plate member facing the slot respectively.

[0016] As a further improvement of the present invention, the connecting block is a triangular prism block.

[0017] As a further improvement of the present invention, the vortex-induced vibration suppression plate member includes a plurality of vortex-induced vibration suppression plates independently arranged along the bridge longitudinal direction. The width of the vortex-induced vibration suppression plate is 20 - 100 cm, and the included angle between the vortex-induced vibration suppression plate and the horizontal plane is 0 - 90°.

[0018] As a further improvement of the present invention, the vortex-induced vibration suppression plate is arranged to incline upward towards the slot, and the two vortex-induced vibration suppression plates on both sides of the slot are arranged in a V-shaped pattern.

[0019] As a further improvement of the present invention, the vortex-induced vibration suppression plate member is integrally formed and connected with the uppermost transverse railing; or

[0020] The vortex-induced vibration suppression plate member is fixedly welded to the uppermost transverse railing; or

[0021] The vortex-induced vibration suppression plate member is integrally formed and connected with the column; or

[0022] The vortex-induced vibration suppression plate member is fixedly welded to the column.

[0023] The beneficial effects of the present invention are as follows:

[0024] (1) By arranging the vortex-induced vibration suppression plate members at the tops of the inner railing members on both sides of the slot of the slotted box girder, the present invention can, to a certain extent, change the flow field structure at the slot and even around the entire slotted box girder, thereby suppressing vortex-induced vibration and achieving effective vortex-induced vibration control performance.

[0025] (2) The vortex-induced vibration suppression plate members of the present invention have a small mass and volume, will not cause a significant increase in the static load and cost of the box girder structure, and have a small amount of work, are convenient for installation and maintenance, and have low manufacturing and installation costs, good construction and maintenance performance, as well as good environmental protection and economic efficiency.

[0026] (3) The vortex-induced vibration suppression plate members of the present invention can adapt to the structural type of the slotted box girder, will not damage the original cross-sectional structure of the slotted box girder, and have a good integration with the original bridge landscape, and have good aesthetics. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a single-slotted box girder provided with a vortex-induced vibration suppression plate member according to the first preferred embodiment of the present invention;

[0029] Figure 2 It is a front view of the inner railing member fixedly connecting the vortex-induced vibration suppression plate through the first connecting member according to the first preferred embodiment of the present invention;

[0030] Figure 3 It is a side view of the first clamp portion connecting the vortex-induced vibration suppression plate according to the first preferred embodiment of the present invention;

[0031] Figure 4 Top view of the slotted box girder with vortex-induced vibration suppression plates in the first preferred embodiment of the present invention;

[0032] Figure 5 Original cross-section of the slotted box girder selected for wind tunnel test and cross-section diagram with vortex-induced vibration suppression plates;

[0033] Figure 6 Wind tunnel test effect diagram of the first preferred embodiment of the present invention;

[0034] Figure 7 Front view of the inner railing member fixing the vortex-induced vibration suppression plate through the second connecting member in the second preferred embodiment of the present invention;

[0035] Figure 8 Side view of the triangular prism block connecting the vortex-induced vibration suppression plate in the second preferred embodiment of the invention;

[0036] Figure 9 Front view of the inner railing member fixing the vortex-induced vibration suppression plate through the first connecting member and the second connecting member respectively in the third preferred embodiment of the present invention;

[0037] Figure 10 For Figure 9 Side view;

[0038] Figure 11 For Figure 9 Top view;

[0039] Figure 12 Structural schematic diagram of the double-slotted box girder with vortex-induced vibration suppression plates in the fourth preferred embodiment of the present invention;

[0040] In the figure: 1. Box girder, 11. Slot, 12. I-shaped cross beam, 13. Box-shaped cross beam, 2. Vortex-induced vibration suppression plate member, 21. Vortex-induced vibration suppression plate, 3. Outer railing member, 4. Inner railing member, 41. Column, 42. Horizontal railing, 5. Connecting clamp, 51. First clamp part, 511. One part of the first clamp part, 512. Another part of the first clamp part, 52. Second clamp part, 521. One part of the second clamp part, 522. Another part of the second clamp part, 53. Third clamp part, 54. Bolt, 55. Stiffening plate, 6. Triangular prism block, 61. First surface, 62. Second surface, 71. Connecting sleeve, 72. Connecting seat. Detailed implementation manners

[0041] To enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] Please refer to Figures 1-3 , this embodiment of the present application discloses a slotted box girder for improving vortex-induced vibration performance, including two box girders 1, railing assemblies, and vortex-induced vibration suppression plate members 2 that are arranged at intervals along the transverse bridge direction. The box girder 1 extends along the longitudinal bridge direction, and the interval between adjacent box girders 1 forms a slot 11. The railing assembly includes an outer railing member 3 and an inner railing member 4. The outer railing member 3 is arranged on the outside of the top of the box girder 1, and the inner railing member 4 is arranged on the top of the box girder 1 and on both sides of the slot 11. The inner railing member 4 includes a plurality of columns 41 arranged at intervals along the longitudinal bridge direction and a plurality of transverse railings 42 fixedly connected to the plurality of columns 41. The plurality of transverse railings 42 are arranged at intervals in the vertical direction. The vortex-induced vibration suppression plate member 2 is arranged on the top of the inner railing member 4, and the vortex-induced vibration suppression plate member 2 extends out of the inner railing member 4 and faces the slot 11.

[0044] By arranging the vortex-induced vibration suppression plate member 2 on the top of the inner railing member 4 on both sides of the slot 11 of the slotted box girder of the present invention, it can adapt to the structural form of the slotted box girder, and can change the flow field structure at the slot 11 and even around the entire slotted box girder to a certain extent. For example, generate additional vortices on the surface of the box girder on the downstream side of the slot to replace the original vortices, or suppress the generation of the original vortices, thereby suppressing vortex-induced vibration and achieving effective vortex-induced vibration control performance. At the same time, the engineering quantity is small, and it has low manufacturing and installation costs and good construction and maintenance performance, with good economy.

[0045] The structure of the outer railing member 3 can be the same as or different from the structure of the inner railing member 4. In this embodiment, it is preferably that the structure of the outer railing member 3 is the same as that of the inner railing member 4. A box girder cross beam connecting the box girders 1 on both sides of the slot 11 can be arranged in the slot 11. The box girder cross beam can include an I-shaped cross beam 12 and a box-shaped cross beam 13, as Figure 4 shown. Of course, it can be understood that the box girder cross beam can also adopt other forms, as long as it can realize the connection of the box girders 1 on both sides of the slot 11, and it is not limited here.

[0046] The vortex-induced vibration suppression plate 2 is fixed to the uppermost horizontal railing 42 through the first connecting member. The first connecting member includes a plurality of connecting clamps 5, and each connecting clamp 5 is clamped on the vortex-induced vibration suppression plate 2 and the uppermost horizontal railing 42. The vortex-induced vibration suppression plate 2 is firmly fixed on the uppermost horizontal railing 42 through the connecting clamp 5. At the same time, the setting of the connecting clamp 5 facilitates installation and disassembly, saving time and effort.

[0047] Specifically, the connecting clamp 5 includes a first clamp portion 51 and a second clamp portion 52 which are connected to each other. A part 511 of the first clamp portion 51 is closely attached to one side of the vortex-induced vibration suppression plate 2 facing the slot 11, and another part 512 of the first clamp portion 51 is closely attached to the outer periphery of the uppermost horizontal railing 42. A part 521 of the second clamp portion 52 is closely attached to the outer periphery of the horizontal railing 42, and another part 522 of the second clamp portion 52 is closely attached to the other side of the vortex-induced vibration suppression plate 2. A part 511 of the first clamp portion 51, the vortex-induced vibration suppression plate 2, and another part 522 of the second clamp portion 52 are fixedly connected, and another part 512 of the first clamp portion 51 and a part 521 of the second clamp portion 52 are fixedly connected. With such a setting, the first clamp portion 51, the vortex-induced vibration suppression plate 2, and the second clamp portion 52 are firmly connected into one body. Another part 512 of the first clamp portion 51 and a part 521 of the second clamp portion 52 are spliced to form a ring that tightly clamps the outer periphery of the uppermost horizontal railing 42, so that the first clamp portion 51, the uppermost horizontal railing 32, and the second clamp portion 52 are firmly integrated, thereby firmly fixing the vortex-induced vibration suppression plate 2 on the uppermost horizontal railing 42. One side and the other side of the vortex-induced vibration suppression plate 2 are opposite sides. The shapes of another part 512 of the first clamp portion 51 and a part 521 of the second clamp portion 52 are not limited to circular arcs, and can be adaptively adjusted according to the cross-sectional shape of the horizontal railing 42 to achieve the firm fixation of the first clamp portion 51 and the second clamp portion 52 on the horizontal railing 42. A part 511 of the first clamp portion 51 and another part 522 of the second clamp portion 52 are both plate-shaped to facilitate tight fixation with the vortex-induced vibration suppression plate 2.

[0048] Furthermore, the connecting clamp 5 further includes a third clamp portion 53. The third clamp portion 53 is closely attached to the other side of the vortex-induced vibration suppression plate 2 and is fixedly connected to a part 511 of the first clamp portion 51. The third clamp portion 53 is separated from the second clamp portion 52, which facilitates the installation of the second clamp portion 52 and improves the firmness of the connection between the vortex-induced vibration suppression plate 2 and the connecting clamp 5.

[0049] Specifically, the first clamping portion 51, the vortex-induced vibration suppression plate member 2, and the second clamping portion 52 can be locked and fixed by passing a bolt 54 through a part 511 of the first clamping portion 51, the vortex-induced vibration suppression plate member 2, and another part 522 of the second clamping portion 52. The first clamping portion 51 and the second clamping portion 52 can be locked and fixed to the uppermost horizontal railing 42 by passing the bolt 54 through another part 512 of the first clamping portion 51 and a part 521 of the second clamping portion 52. The first clamping portion 51, the vortex-induced vibration suppression plate member 2, and the third clamping portion 53 can be locked and fixed by passing the bolt 54 through a part of the first clamping portion 51 and the vortex-induced vibration suppression plate member 2.

[0050] To improve the strength of the connection clamp 5 and thus enhance the stability of the connection between the horizontal railing 42 and the vortex-induced vibration suppression plate member 2, a stiffening plate 55 is preferably fixed at the connection between a part 511 of the first clamping portion 51 and another part 512 of the first clamping portion 51.

[0051] Preferably, a part 511 of the first clamping portion 51 and another part 512 of the first clamping portion 51 are integrally formed and connected to improve the strength of the first clamping portion 51. A part 521 of the second clamping portion 52 and another part 522 of the second clamping portion 52 are integrally formed and connected to improve the strength of the second clamping portion 52.

[0052] The vortex-induced vibration suppression plate member 2 includes a plurality of vortex-induced vibration suppression plates 21 independently arranged along the bridge longitudinal direction. The width B of the vortex-induced vibration suppression plate 21 is 20 - 100 cm, and the angle α between the vortex-induced vibration suppression plate 21 and the horizontal plane is 0 - 90°, so as to ensure a good vortex-induced vibration suppression effect. Further preferably, the width B of the vortex-induced vibration suppression plate 21 is 50 cm. Of course, it is not limited to the above dimensions, and the width B of the vortex-induced vibration suppression plate 21 and the angle α between the vortex-induced vibration suppression plate 21 and the horizontal plane can also be adaptively adjusted according to the size of the open-slot box girder section and the attached facilities. Preferably, the vortex-induced vibration suppression plate 21 is inclined upward towards the open slot 11, and the two vortex-induced vibration suppression plates 21 on both sides of the open slot 11 are arranged in a flare shape to further improve the vortex-induced vibration suppression effect.

[0053] In this embodiment, the vortex-induced vibration suppression plate 21 is rectangular. It can be understood that the edge of the vortex-induced vibration suppression plate 21 can also be set in a wavy or serrated shape according to functional requirements, or holes can be provided on the vortex-induced vibration suppression plate 21. Preferably, the material of the vortex-induced vibration suppression plate 21 is steel or a polymer composite material to ensure that the vortex-induced vibration suppression plate 21 meets the requirements of stiffness and is not easily deformed.

[0054] To better verify the effect of the present invention in improving vortex-induced vibration, an open-slot box girder was selected. The original cross-sectional view of the box girder and the cross-sectional view with the vortex-induced vibration suppression plate member 2 are shown in Figure 5 Figures (a) and (b) as shown. The cross-section of this box girder was subjected to a wind tunnel test through a large-scale spring-suspended segment model, and the obtained results are shown in Figure 6As shown. The original cross-section of the bridge before installing the vortex-induced vibration suppression plate 2 undergoes vertical bending vortex-induced vibration at a wind attack angle of +3°. After installing the vortex-induced vibration suppression plate 2, under the same test conditions and attack angle, the vortex-induced vibration no longer occurs, that is, the vortex-induced vibration suppression plate 2 has the effect of suppressing vortex-induced vibration.

[0055] Embodiment 2

[0056] Please refer to Figure 7 、 Figure 8 In this embodiment, the difference from Embodiment 1 is that the vortex-induced vibration suppression plate 2 is fixed to the top of the column 41 through a second connecting member. The second connecting member includes a plurality of connecting blocks, and each connecting block is tightly fixed to the top surface of the column 41 and the side of the vortex-induced vibration suppression plate 2 facing the slot 11 respectively. The connecting blocks can be welded and fixed to the column 41 and the vortex-induced vibration suppression plate 2 respectively.

[0057] Preferably, the connecting block is a triangular prism block 6. At this time, the first surface 61 of the triangular prism block 6 is arranged parallel to the top surface of the column 41, and the second surface 62 of the triangular prism block 6 is arranged parallel to the side of the vortex-induced vibration suppression plate 2 facing the slot 11, so as to achieve the stability of the connection between the triangular prism block 6 and the column 41 and the vortex-induced vibration suppression plate 2 respectively. Of course, it can be understood that the connecting block is not limited to the triangular prism block 6, and can be adaptively adjusted according to the shapes of the top surface of the column 41 and the side of the vortex-induced vibration suppression plate 2 facing the slot 11, as long as it can ensure that the connecting block is tightly attached to the top surface of the column 41 and the side of the vortex-induced vibration suppression plate 2 facing the slot 11.

[0058] Embodiment 3

[0059] Please refer to Figure 9 、 Figure 10 、 Figure 11, the difference between this embodiment and the first embodiment is that: the vortex-induced vibration suppression plate 2 is fixed to the uppermost horizontal railing 42 through the first connecting member and the vortex-induced vibration suppression plate 2 is fixed to the top of the column 41 through the second connecting member. The first connecting member includes a connecting sleeve 71, and the connecting sleeve 71 is respectively welded and fixed to the uppermost horizontal railing 42 and the vortex-induced vibration suppression plate 2. The second connecting member includes a connecting seat 72, and the connecting seat 72 is respectively welded and fixed to the top surface of the column 41 and the vortex-induced vibration suppression plate 2. The first connecting member can also be set as a connecting clamp 5, and the second connecting member is set as a triangular prism block 6, so that the vortex-induced vibration suppression plate 2 is respectively fixed stably on the uppermost horizontal railing 42 through the connecting clamp 5 and on the column 41 through the triangular prism block 6. Of course, it can be understood that the vortex-induced vibration suppression plate 2 can also be integrally formed and connected with the uppermost horizontal railing 42 directly, or the vortex-induced vibration suppression plate 2 is welded and fixed to the uppermost horizontal railing 42, or the vortex-induced vibration suppression plate 2 is integrally formed and connected with the column 41, or the vortex-induced vibration suppression plate 2 is welded and fixed to the column 41, as long as the vortex-induced vibration suppression plate 2 can be fixed stably on the column 41 and / or the uppermost horizontal railing 42, which is not limited herein.

[0060] Embodiment Four

[0061] Please refer to Figure 12 , the difference between this embodiment and the first embodiment is that: the number of the box girders 1 is three, forming a double-grooved box girder. The cross-section of the horizontal railing 42 is rectangular. The vortex-induced vibration suppression plate 2 is fixed to the horizontal railing 42, and any firmly connectable connection methods such as welding, integral forming, clamps and other connecting members can be adopted.

[0062] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0063] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A slotted box girder for improving vortex-induced vibration performance, characterized in that Comprising: At least two box girders spaced apart at least along the transverse bridge direction, the box girders extending along the longitudinal bridge direction, and a slot being formed by the space between adjacent box girders; A railing assembly, the railing assembly including an outer railing member and an inner railing member, the outer railing member being provided on the outer side of the top of the box girder, the inner railing member being provided on the top of the box girder and located on both sides of the slot, the inner railing member including a plurality of upright columns spaced apart along the longitudinal bridge direction and a plurality of transverse railings fixedly connected to the plurality of upright columns, the plurality of transverse railings being spaced apart along the vertical direction; A vortex-induced vibration suppression plate member, the vortex-induced vibration suppression plate member being provided on the top of the inner railing member, the vortex-induced vibration suppression plate member protruding from the inner railing member and facing the slot.

2. The slotted box girder for improving vortex-induced vibration performance according to claim 1, wherein The vortex-induced vibration suppression plate member is fixed to the uppermost transverse railing through a first connecting member, and / or the vortex-induced vibration suppression plate member is fixed to the top of the upright column through a second connecting member.

3. The slotted box girder for improving vortex-induced vibration performance according to claim 2, wherein, The first connecting member includes a plurality of connecting clamps, and each connecting clamp is clamped on the vortex-induced vibration suppression plate member and the uppermost transverse railing.

4. A slotted box girder for improving vortex-induced vibration performance according to claim 3, wherein, The connecting clamp includes a first clamp portion and a second clamp portion connected to each other. A part of the first clamp portion is closely attached to the side of the vortex-induced vibration suppression plate member facing the slot, another part of the first clamp portion is closely attached to the outer periphery of the uppermost transverse railing, a part of the second clamp portion is closely attached to the outer periphery of the uppermost transverse railing, another part of the second clamp portion is closely attached to the other side of the vortex-induced vibration suppression plate member, a part of the first clamp portion, the vortex-induced vibration suppression plate member, and another part of the second clamp portion are fixedly connected, and another part of the first clamp portion is fixedly connected to a part of the second clamp portion.

5. The slotted box girder for improving vortex-induced vibration performance according to claim 4, wherein, The connecting clamp further includes a third clamp portion, and the third clamp portion is closely attached to the other side of the vortex-induced vibration suppression plate member and fixedly connected to a part of the first clamp portion.

6. The slotted box girder for improving vortex-induced vibration performance according to claim 2, characterized in that, The second connecting member includes a plurality of connecting blocks, and each connecting block is closely attached and fixed to the top surface of the upright column and the side of the vortex-induced vibration suppression plate member facing the slot respectively.

7. The slotted box girder for improving vortex-induced vibration performance according to claim 6, wherein The connecting block is a triangular prism block.

8. A slotted box girder for improving vortex-induced vibration performance according to claim 1, characterized in that, The vortex-induced vibration suppression plate member includes a plurality of vortex-induced vibration suppression plates independently provided along the longitudinal bridge direction, the width of the vortex-induced vibration suppression plate is 20 - 100 cm, and the included angle between the vortex-induced vibration suppression plate and the horizontal plane is 0 - 90°.

9. The slotted box girder for improving vortex-induced vibration performance according to claim 8, wherein The vortex-induced vibration suppression plate is inclined upward facing the slot, and the two vortex-induced vibration suppression plates on both sides of the slot are arranged in a flare shape.

10. The slotted box girder for improving vortex-induced vibration performance according to claim 1, wherein, The vortex-induced vibration suppression plate member is integrally formed and connected with the uppermost transverse railing; or The vortex-induced vibration suppression plate member is fixedly welded to the uppermost transverse railing; or The vortex-induced vibration suppression plate member is integrally formed and connected with the upright column; or the vortex-induced vibration suppression plate member is fixedly welded to the upright column.

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