CN112681106A - Pneumatic structure for inhibiting wind-induced vibration of steel arch bridge - Google Patents
Pneumatic structure for inhibiting wind-induced vibration of steel arch bridge Download PDFInfo
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Abstract
The invention discloses a pneumatic structure for inhibiting wind-induced vibration of a steel arch bridge, which comprises a plurality of air deflector units arranged on the bottom surface of an arch rib at intervals and a ventilation guardrail continuously arranged on the top surface of the arch rib. Adopt this device can disturb respectively through the air current swirl of arch rib top and below, can reduce simultaneously again because of setting up the too big influence of wind load that aviation baffle unit and guardrail produced, improve the structural security, the ventilation guardrail still enough regards as patrolling and examining the way handrail, is favorable to guaranteeing personnel's safety of patrolling and examining, moreover, because the different structures are adopted to the upper and lower side of arch rib, can also lead to the upper and lower air current that regeneration to have very big asynchronism, reduce the possibility that wind-induced vibration takes place, the control of the vertical wind vibration of specially adapted large-span steel arch rib structure, the security of construction stage bridge has been effectively guaranteed, can avoid again because the cost that applys the attenuator and bring increases the problem, can continue to restrain the wind vibration in the operation stage, has important spreading value.
Description
Technical Field
The invention relates to the technical field of arch bridge pneumatic structures, in particular to a pneumatic structure for inhibiting wind-induced vibration of a steel arch bridge.
Background
Along with the material performance and the great improvement of construction and manufacturing equipment, the span of the bridge is continuously refreshed and recorded. The arch bridge has beautiful modeling and is convenient to assemble and transport, and is one of the preferable bridge models when crossing gullies and rivers. The arch rib is used as an important stressed structure of the arch bridge, the section is generally rectangular or similar to rectangular, the structural section is relatively passivated, the wind-resistant stability is poor, wind-induced vibration can occur on the section under certain conditions, the section can possibly occur in the construction stage and the operation stage, and the safety and the normal use of bridge construction can be seriously influenced. Steel arch bridges can reach larger spans than concrete arch bridges, but the steel bridges have a small damping ratio and a more flexible structure, which results in that the steel arch bridges are extremely sensitive to wind.
In order to improve the blunt profile of a rectangular or rectangular-like rib, the conventional approach is:
1) the rectangular section is provided with a chamfer. The section is slightly subjected to pneumatic smooth treatment through chamfering, the separation point of the airflow at the sharp corner is divided into two parts, and the possibility of vortex formation is reduced.
2) Rib inward/outward camber. By inclining the arch rib, a certain angle is formed between the incoming flow and the cross section of the arch rib, and the possibility of falling off of the fixed vortex formed by the vertical rectangular cross section is reduced.
3) The corrugated plate is arranged above the arch rib. The method is suitable for half-through arch bridges and half-through arch bridges, the air flow velocity of the arch rib is accelerated by compressing the air flow of the arch rib through the corrugated plate, the vortex shedding condition of the original arch rib is disturbed, and the effect of limiting the vortex-induced resonance amplitude of the arch rib is achieved.
Above-mentioned scheme has improved the anti-wind stability of arched bridge to a certain extent, has reduced the possibility that wind shakes and takes place, nevertheless still exists following not enough:
1) the rectangular section chamfer structure is changed from a quadrangle to a hexagon or an octagon or a similar rectangle with an arc, the structure is complex, the construction is inconvenient, and the bridge construction cost is greatly improved. The existing engineering examples show that the rectangular section of the chamfer still has the possibility of generating wind vibration, and the chamfer can not completely change the passive aerodynamic shape.
2) Rib inward/outward camber. The method leads the stress of the structural space to be complex and the construction difficulty to be increased, but the inclination angle of the narrow-width railway bridge, especially the deck type railway bridge, is limited.
3) The corrugated plate is arranged above the arch rib. The buckled plate is too much with arch rib connecting elements, and can not set up above the arch rib and patrol and examine the way.
Disclosure of Invention
The invention aims to overcome the defects that the prior art is difficult to conveniently and effectively solve the problem of poor wind resistance stability of a steel arch bridge, particularly a deck type arch bridge, and wind-induced vibration can seriously influence the safety of the bridge in a construction stage and an operation stage, and provides a pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge.
In order to achieve the purpose, the invention provides the following technical scheme:
a pneumatic structure for inhibiting wind-induced vibration of a steel arch bridge comprises a plurality of air deflector units arranged on the bottom surface of an arch rib at intervals and a ventilation guardrail continuously arranged on the top surface of the arch rib.
By adopting the pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge, the air deflector unit arranged on the bottom plate of the arch rib is utilized to guide the airflow passing through the lower part of the arch rib to the outside of the arch rib, the vortex below the arch rib is disturbed, the ventilation guardrail arranged on the top plate of the arch rib is utilized to disturb the airflow vortex above the arch rib, meanwhile, the problem of overlarge wind load caused by arranging the guard bar can be reduced, the transverse stability of the structure is improved, the ventilation guardrail can also be used as a handrail of the inspection way, which is beneficial to ensuring the safety of inspection personnel, moreover, due to the fact that the upper portion and the lower portion of the arch rib are of different structures, regular vortex airflows of the original arch rib structure can be disturbed respectively, the regenerated upper airflow and regenerated lower airflow can be asynchronous greatly, and the possibility of wind-induced vibration is reduced to a greater extent. This application is from structural wind engineering angle, adopt pneumatic structure to reach the drainage, the water conservancy diversion, the purpose of indiscriminate flow, the control of the vertical wind vibration of specially adapted large-span steel arch rib structure, and steel arch bridge construction operation is weakest in the complete cycle, the stage of controlling most, the vertical vibration of arch rib in the construction stage promptly, therefore, this application simple structure, can effectively solve the problem of the big span arch bridge construction security that the wind vibration leads to of present arch rib construction inadequately considering, the security in bridge construction stage has been guaranteed effectively, can avoid again increasing the problem owing to the cost of applying the attenuator and bringing, can continue to restrain the wind vibration in the operation stage, be particularly useful for the formula arch bridge structure of taking up, important spreading value has.
Preferably, the air deflector unit comprises two vertical plates and a transverse plate connected between the two vertical plates, the vertical plates are arranged along a transverse bridge direction, and the thickness direction of the transverse plate is arranged along a vertical direction.
By adopting the arrangement mode, namely the vertical plate and the transverse plate are both provided with the thickness sides facing the windward side, a ventilation channel is arranged between the vertical plate and the transverse plate, the windward area is reduced as much as possible, the windward area of the arch rib is hardly increased, incoming flow passing through the lower part of the arch rib is effectively guided to the outside of the lower side of the arch rib, so that the bottom plate of the arch rib cannot form regular vortex, and wind-induced vibration is effectively inhibited.
Further preferably, the air deflector unit is arranged on the outer side of the rib bottom surface.
Namely, the air deflector unit is arranged closer to the windward side of the corresponding arch rib, so that the air deflector unit is beneficial to guiding the air flow flowing through the separation point at the lower part of the windward side of the arch rib to the lower side far away from the arch rib as soon as possible.
Further preferably, the angle that vertical board lateral surface leaned out is greater than its inboard angle that leaned out, the lateral surface bottom surface of vertical board is higher than its inboard bottom surface, vertical board connects the width of rib one end is less than keeps away from the width of rib one end.
By adopting the arrangement mode, namely the air deflector unit is obliquely arranged towards the outer side of the arch rib, and the transverse plate is obliquely arranged, so that the air outlet of the air deflector unit is far away from the arch rib, the wind load borne by the arch rib is reduced, and the transverse stability is improved. Simultaneously, the vortex that makes probably produce after the air current separation keeps away from the arch rib, simultaneously, connects the one end width of arch rib is less, is favorable to alleviateing welding face width, reduces welding work volume.
Further preferably, the height of the vertical plate is 0.1 to 0.3 times of the height of the arch rib, the width of the upper edge of the vertical plate is 0.2 to 0.3 times of the width of the arch rib, the width of the lower edge of the vertical plate is 0.3 to 0.4 times of the width of the arch rib, and the distance between the two vertical plates of the air deflector unit is 1 to 1.1 times of the width of the arch rib.
Preferably, the transverse plates are flat plates or arc-shaped plates, the length of each transverse plate is 1.1-1.2 times of the distance between the corresponding two vertical plates, and the width of each transverse plate is 1.1-1.3 times of the width of the lower edge of the corresponding vertical plate.
The length of the transverse plate is the longitudinal direction, the width of the transverse plate is the transverse direction, four edges of the transverse plate exceed the corresponding vertical plates, reattachment points at the lower edges of the arch ribs after air flow separation can be delayed, construction and welding can be facilitated, and due to the adoption of the cambered plate, regular vortexes are not easily formed by air flow due to the irregular surface of the cambered plate, and the possibility of wind-induced vibration is further reduced.
Further preferably, the distance between the air deflector units and the outer edge of the arch rib is 5-10cm, and the center distance between two adjacent air deflector units is 2-3 times of the width of the air deflector units.
Further preferably, the air deflector units are distributed between 1/4-3/4 of the arch rib span.
Namely, the air deflector unit is arranged at a position outside the arch feet 1/4 at two sides, is close to the bottom of the pier, has strong constraint, is not easy to generate wind-induced vibration, is favorable for further reducing the manufacturing cost, lightens the self weight of the bridge, and reduces the processing and installation difficulty.
Preferably, the ventilation guardrail comprises a wind shield, vertical rods and cross rods, the cross rods are distributed on the upper portion, the middle portion and the lower portion of the vertical rods, and the wind shield is located between the cross rods on the middle portion and the lower portion.
Adopt above-mentioned mode of setting up, promptly both sides are all ventilative about ventilation guardrail's deep bead, are favorable to reducing the area of keeping out the wind because of setting up the guardrail and form, have effectively reduced the holistic wind load atress of arch rib, and reduce cost simultaneously lightens the dead weight.
Further preferably, the two sides of the top surface of each arch rib are provided with the ventilation guardrails, the cross sections of the ventilation guardrails are of arc structures, and the distance between the two ventilation guardrails is gradually reduced from bottom to top
The both sides promptly ventilation guardrail is the form of pitch arc endocyst, is favorable to compressing and patrols and examines the way width, and the pedestrian that stabilizes walks to walk the region, and the guarantee patrols and examines personnel's safety.
In summary, compared with the prior art, the invention has the beneficial effects that:
1. the pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge can respectively disturb airflow vortexes passing through the upper part and the lower part of the arch rib, simultaneously can reduce the influence of overlarge wind load generated by arranging the air deflector unit and the guardrail, improves the structural safety, can be used as a handrail of an inspection road to be beneficial to ensuring the safety of inspection personnel, is particularly suitable for controlling the vertical wind vibration of a large-span steel arch rib structure, effectively ensures the safety of the bridge in the construction stage, can avoid the cost increase problem caused by applying a damper, can continuously inhibit the wind vibration in the operation stage, and is particularly suitable for a top-supported arch bridge structure, has important popularization value.
2. The windward area increased by adding pneumatic measures is reduced as much as possible, the whole wind load stress of the arch rib is reduced, the problem of transverse stability is reduced, the manufacturing cost is further reduced, the self weight of the bridge is reduced, and the processing and mounting difficulty is reduced.
3. The width of the inspection road is favorably compressed, the pedestrian walking area is stabilized, and the safety of inspection personnel is guaranteed.
Description of the drawings:
FIG. 1 is a schematic cross-sectional view of a pneumatic structure for suppressing wind-induced vibration in a steel arch bridge according to the present invention;
FIG. 2 is a schematic elevational view of a pneumatic structure for suppressing wind-induced vibration in a steel arch bridge according to the present invention;
fig. 3 is a schematic structural view of an air guiding plate unit in embodiment 1;
FIG. 4 is a schematic layout of a pneumatic structure for suppressing wind-induced vibration of a steel arch bridge according to the present invention;
fig. 5 is a first schematic structural view of an air guiding plate unit in embodiment 2;
fig. 6 is a second schematic structural view of the air guiding plate unit in embodiment 2.
The labels in the figure are: 1-arch rib, 2-air deflector unit, 21-vertical plate, 22-transverse plate, 3-ventilation guardrail, 31-wind deflector, 32-vertical rod, 33-cross rod.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
The invention relates to a pneumatic structure for inhibiting wind-induced vibration of a steel arch bridge, which comprises a plurality of air deflector units 2 arranged on the bottom surface of an arch rib 1 at intervals and a ventilation guardrail 3 continuously arranged on the top surface of the arch rib 1.
Specifically, as shown in fig. 1 to 3, a cross section of two arch ribs 1 is shown, a cross brace is connected between the two arch ribs 1, and the air deflector unit 2 is arranged on the bottom plate of the arch rib 1 and used for guiding the air flow passing through the lower part of the arch rib to the outside of the arch rib 1 and disturbing the vortex below the arch rib 1. The air guide plate unit 2 comprises two vertical plates 21 and a transverse plate 22 connected between the two vertical plates 21, the vertical plates 21 are arranged along a transverse bridge direction, the thickness direction of the transverse plate 22 is arranged along a vertical direction, a ventilation channel is arranged in the middle of the air guide plate unit 2, namely, the vertical plates 21 and the transverse plate 22 are both thickness sides facing a windward side, the windward area is reduced as much as possible, namely, the windward area of the arch rib 1 is hardly increased, incoming flow passing through the lower side of the arch rib 1 is effectively guided to the outside of the lower side of the arch rib 1, so that the bottom plate of the arch rib 1 cannot form regular vortex, and wind-induced vibration is effectively inhibited.
As shown in fig. 1, the air deflector unit 2 is disposed on the outer side of the bottom surface of the arch rib 1, which is beneficial to guide the air flow passing through the separation point of the windward lower part of the arch rib to a position far away from the lower side of the arch rib as soon as possible, for example, the air deflector unit 2 is 5-10cm away from the outer edge of the arch rib 1.
Preferably, the center distance between two adjacent air deflector units 2 is 2-3 times the width of the air deflector unit 2, the distribution of the air deflector units 2 on the arch rib 1 is determined according to actual conditions, the arch feet at two sides are closer to the bottom of the pier, the restriction is stronger, and wind-induced vibration is not easy to occur, and preferably, the air deflector units 2 are distributed in the area between 1/4 and 3/4 of the span of the arch rib 1, as shown in fig. 4, namely, the air deflector units 2 are arranged at positions other than the arch feet 1/4 at two sides, so that the construction cost is further reduced, the dead weight of a bridge is reduced, and the processing and installation difficulty is reduced.
As shown in fig. 3, an outward inclination angle of the outer side of the vertical plate 21 is greater than an outward inclination angle of the inner side thereof, a width of one end of the vertical plate 21 connected to the arch rib 1 is smaller than a width of one end far away from the arch rib 1, a height of the vertical plate 21 is 0.1 to 0.3 times of the height of the arch rib 1, a width of an upper edge of the vertical plate 21 is 0.2 to 0.3 times of the width of the arch rib 1, a width of a lower edge of the vertical plate 21 is 0.3 to 0.4 times of the width of the arch rib 1, and a distance between two vertical plates 21 of the air deflector unit 2 is 1 to 1.1 times of the width of the arch rib 1. The bottom surface of the outer side surface of the vertical plate 21 is higher than the bottom surface of the inner side surface thereof, the transverse plate 22 is a flat plate and is arranged upwards in an inclined manner from inside to outside, namely, one side close to the windward side is higher, so that the airflow is favorably kept away from the bottom plate of the arch rib 1, the length of the transverse plate 22 along the bridge direction is 1.1-1.2 times of the distance between the two corresponding vertical plates 21, the transverse width of the transverse plate 22 along the bridge direction is 1.1-1.3 times of the width of the lower edge of the corresponding vertical plate 21, and the transverse plate 22 extends out of the corresponding vertical plate 21 in the length and width directions. Meanwhile, vortexes possibly generated after air flow separation are far away from the arch rib 1, and the width of one end for connecting the arch rib is small, so that the width of a welding surface is favorably reduced, and the welding workload is reduced.
Every 1 top surface both sides of arch rib all are equipped with ventilation guardrail 3, ventilation guardrail 3's cross section is the arc structure, see figure 1, two ventilation guardrail 3's interval is followed and is up reduced gradually from down, both sides promptly ventilation guardrail is the form of pitch arc endocyst, is favorable to compressing and patrols and examines the way width, and firm pedestrian walks to walk the region, and the guarantee personnel safety of patrolling and examining.
The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge not only can respectively disturb the airflow vortexes passing through the upper part and the lower part of the arch rib, meanwhile, the influence of overlarge wind load generated by arranging the air deflector unit and the guardrail can be reduced, the structural safety is improved, the ventilation guardrail can also be used as a handrail of the inspection way, which is beneficial to ensuring the safety of inspection personnel, moreover, because the upper and lower parts of the arch rib adopt different structures, the regenerated upper and lower airflows can have great asynchronous anisotropy, the wind-induced vibration is obviously reduced, is particularly suitable for controlling the vertical wind vibration of a large-span steel arch rib structure, not only effectively ensures the safety of the bridge in the construction stage, but also avoids the problem of cost increase caused by applying a damper, wind vibration can be continuously restrained in the operation stage, the type of the arch bridge is not limited, and the method has important popularization value.
Example 2
The pneumatic structure for suppressing the wind-induced vibration of the steel arch bridge has the same structure as that of the embodiment 1, and is different from the embodiment in that the transverse plate 22 can be replaced by a cambered plate. Due to the adoption of the cambered plate, the surface is irregular, so that the airflow is less prone to forming regular vortices, and the possibility of wind-induced vibration is further reduced.
As shown in fig. 5, the concave surface of the transverse plate 22 faces the arch rib 1; as shown in fig. 6, the convex surface of the transverse plate 22 faces the rib 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge is characterized by comprising a plurality of air deflector units (2) arranged on the bottom surface of an arch rib (1) at intervals and a ventilation guardrail (3) continuously arranged on the top surface of the arch rib (1).
2. The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge according to claim 1, wherein the air deflector unit (2) comprises two vertical plates (21) and a transverse plate (22) connected between the two vertical plates (21), the vertical plates (21) are arranged along the transverse bridge direction, and the thickness direction of the transverse plate (22) is arranged along the vertical direction.
3. A pneumatic structure for suppressing wind-induced vibration of a steel arch bridge according to claim 2, wherein the air deflector unit (2) is arranged on the outer side of the bottom surface of the arch rib (1).
4. A pneumatic structure for suppressing wind induced vibration of a steel arch bridge according to claim 3, wherein the outer side surface of the vertical plate (21) is inclined outwards at a larger angle than the inner side surface thereof, the bottom surface of the outer side surface of the vertical plate (21) is higher than the bottom surface of the inner side surface thereof, and the width of the vertical plate (21) at the end connected with the arch rib (1) is smaller than the width at the end far away from the arch rib (1).
5. The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge according to claim 4, wherein the height of the vertical plate (21) is 0.1-0.3 times of the height of the arch rib (1), the width of the upper edge of the vertical plate (21) is 0.2-0.3 times of the width of the arch rib (1), the width of the lower edge of the vertical plate (21) is 0.3-0.4 times of the width of the arch rib (1), and the distance between the two vertical plates (21) of the air deflector unit (2) is 1-1.1 times of the width of the arch rib (1).
6. A pneumatic structure for suppressing wind-induced vibration of a steel arch bridge according to claim 5, wherein the transverse plates (22) are flat plates or cambered plates, the length of the transverse plates (22) is 1.1-1.2 times the distance between the two corresponding vertical plates (21), and the width of the transverse plates (22) is 1.1-1.3 times the width of the lower edges of the corresponding vertical plates (21).
7. The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge according to claim 3, wherein the distance between the air deflector units (2) and the outer edge of the arch rib (1) is 5-10cm, and the distance between the centers of two adjacent air deflector units (2) is 2-3 times of the width of the air deflector units (2).
8. A pneumatic structure for suppressing wind induced vibration of a steel arch bridge according to claim 2, wherein the air deflector units (2) are distributed between 1/4-3/4 of the span of the arch rib (1).
9. A pneumatic structure for suppressing wind-induced vibration of a steel arch bridge according to any one of claims 1 to 8, wherein the ventilation fence (3) comprises wind deflectors (31), vertical rods (32) and cross rods (33), the cross rods (33) are distributed on the upper part, the middle part and the lower part of the vertical rods (32), and the wind deflectors (31) are positioned between the cross rods (33) on the middle part and the lower part.
10. The pneumatic structure for inhibiting the wind-induced vibration of the steel arch bridge according to claim 9, wherein the ventilation guardrails (3) are arranged on two sides of the top surface of each arch rib (1), the cross section of each ventilation guardrail (3) is of an arc structure, and the distance between the two ventilation guardrails (3) is gradually reduced from bottom to top.
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| CN202011604147.3A CN112681106B (en) | 2020-12-29 | 2020-12-29 | Pneumatic structure for inhibiting wind-induced vibration of steel arch bridge |
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| CN112681106B (en) | 2022-04-26 |
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