CN110886193B - Pneumatic device for controlling vortex vibration of I-shaped superposed beam bridge and using method thereof - Google Patents
Pneumatic device for controlling vortex vibration of I-shaped superposed beam bridge and using method thereof Download PDFInfo
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- CN110886193B CN110886193B CN201911211820.4A CN201911211820A CN110886193B CN 110886193 B CN110886193 B CN 110886193B CN 201911211820 A CN201911211820 A CN 201911211820A CN 110886193 B CN110886193 B CN 110886193B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention discloses a pneumatic device for controlling vortex vibration of an I-shaped superposed beam bridge and a using method thereof. The pneumatic device comprises a guide plate, a connecting piece and a guide plate stiffening plate; one end of the guide plate in the width direction is connected with the first end of the connecting piece; the second end part of the connecting piece is used for being connected with the outer edge of the I-shaped longitudinal beam bottom plate of the I-shaped superposed beam, so that an inclined angle which is smaller than 90 degrees is formed between the guide plate and the I-shaped longitudinal beam bottom plate; the first end part of the guide plate stiffening plate is connected with the plate surface of the guide plate; and the second end part of the guide plate stiffening plate, which is opposite to the first end part of the guide plate stiffening plate, is used for being connected with the plate surface of the I-shaped longitudinal beam bottom plate. The pneumatic device can change the flow field characteristics of the bottom and the inner side of the I-shaped superposed beam, inhibit the generation of vortexes or blow large vortexes away by incoming flow, and eliminate vortex-induced vibration of the main beam, thereby improving the driving comfort and safety and being beneficial to prolonging the service life of the bridge.
Description
Technical Field
The invention relates to the field of bridge engineering and disaster prevention engineering, in particular to a pneumatic device for controlling vortex vibration of an I-shaped composite beam bridge and a using method thereof.
Background
The I-shaped composite beam is widely applied to the design of modern cable-stayed bridges due to the characteristics of light dead weight, convenient construction, superior stress performance and the like, but the vortex excitation dynamic response of the bridge is more obvious and more complex because the open blunt body shape of the I-shaped composite beam falls off by the streaming vortex compared with the fully-closed box beam. Although the vortex-induced vibration does not cause the bridge to be destructively damaged like fluttering or galloping, the driving comfort is influenced, and the fatigue of bridge components is accelerated, so that the operation safety of the bridge is influenced. Therefore, the method has very important significance in adopting effective measures to control the vortex vibration amplitude of the bridge.
Disclosure of Invention
The invention discloses a pneumatic device for controlling vortex vibration of an I-shaped composite beam bridge, aiming at solving the problem that the I-shaped composite beam bridge is easy to generate vortex-induced vibration. The pneumatic device comprises a guide plate, a connecting piece and a guide plate stiffening plate; one end of the guide plate in the width direction is connected with the first end of the connecting piece; the second end part of the connecting piece is used for being connected with the outer edge of the I-shaped longitudinal beam bottom plate of the I-shaped superposed beam, so that an inclined angle which is smaller than 90 degrees is formed between the guide plate and the I-shaped longitudinal beam bottom plate; the first end part of the guide plate stiffening plate is connected with the plate surface of the guide plate; and the second end part of the guide plate stiffening plate, which is opposite to the first end part of the guide plate stiffening plate, is used for being connected with the plate surface of the I-shaped longitudinal beam bottom plate.
Further, the guide plate is located between the I-shaped longitudinal beam bottom plate and the maintenance vehicle track. The maintenance vehicle track comprises a maintenance vehicle truss and a maintenance vehicle suspension bracket. The horizontal height of the lower edge of the guide plate is higher than that of the top surface of the maintenance vehicle truss. The guide plate is located the outside of tool car mounted frame, has certain distance between the two, ensures that tool car mounted frame can not conflict with the guide plate.
In particular, the connections are all welds.
Further, the length of the guide plate is the same as that of the I-shaped longitudinal beam bottom plate in the axial direction of the bridge.
Specifically, the angle is 10 ° to 30 °, preferably 15 ° to 30 °. Specifically, the vertical height of the baffle is 24-32cm, preferably 28 cm; the width is 140-160cm, preferably 150 cm.
Further, the length of the second end of the baffle stiffener is 1/2 the width of the i-beam bottom panel.
Furthermore, the number of the guide plate stiffening plates is n, the guide plates are arranged into 1 column, and n is larger than 1.
Further, n is equal to the number of the steel cross beams of the I-shaped composite beam, and the guide plate stiffening plates are arranged corresponding to the positions of the steel cross beams.
Further, the connecting piece is a semi-elliptical connecting plate, and the first end of the connecting piece and the second end of the connecting piece are both located on the minor axis of the semi-ellipse.
Further, the ratio of the minor axis radius to the major axis radius of the semi-elliptical connecting plate is 1: 2. Specifically, the semielliptical connecting plate has a minor axis radius of 7.5cm and a major axis radius of 15 cm.
On the other hand, the invention also discloses a use method of the pneumatic device for controlling the vortex vibration of the I-shaped composite beam bridge. The using method comprises the following steps: connecting the second end part of the connecting piece with the outer edge of the bottom plate of the I-shaped longitudinal beam, so that the included angle is inclined downwards and is smaller than 90 degrees; and connecting the second end part of the flow guide plate stiffening plate with the plate surface of the I-shaped longitudinal beam bottom plate.
And further, the two pneumatic devices are respectively arranged below the bottom plates of the I-shaped longitudinal beams on two sides of the I-shaped superposed beam. Specifically, the guide plates are symmetrically arranged below the I-shaped longitudinal beam bottom plates on two sides in the full-length mode along the axis direction of the bridge.
Further, when the length of the second end of the guide plate stiffening plate is 1/2 of the width of the i-shaped longitudinal beam bottom plate, and the second end of the guide plate stiffening plate is connected with the plate surface of the i-shaped longitudinal beam bottom plate, the distances from the third end and the fourth end of the guide plate stiffening plate to the center line of the i-shaped longitudinal beam bottom plate are both 1/4 of the width of the i-shaped longitudinal beam bottom plate. Specifically, the width of the H-shaped longitudinal beam bottom plate is 150cm, and the distance between the third end part and the fourth end part of the guide plate stiffening plate and the central line of the H-shaped longitudinal beam bottom plate is 37.5 cm.
Further, when the distance between the maintenance vehicle truss and the I-shaped longitudinal beam bottom plate is increased, the angle range of the included angle between the guide plate and the I-shaped longitudinal beam bottom plate which is allowed to be adjusted is larger. Specifically, when the distance is 60cm, the included angle is 10 degrees, the width of the guide plate is 150cm, the radius of the short axis of the semi-elliptic connecting plate is 7.5cm, and the radius of the long axis of the semi-elliptic connecting plate is 15 cm. The distance between the truss of the maintenance vehicle and the bottom plate of the I-shaped longitudinal beam is at least 60 cm.
The invention has the advantages that: on the basis of the traditional I-shaped superposed beam, the invention respectively adds a guide plate which is connected inwards and downwards in a downward inclined manner on the I-shaped longitudinal beam bottom plates on the two sides of the traditional I-shaped superposed beam. The structure can change the flow field characteristics of the bottom and the inner side of the I-shaped superposed beam, and inhibit the generation of vortexes or blow large vortexes away by incoming flow. The pneumatic device can change the flow field characteristics of the bottom and the inner side of the I-shaped superposed beam, inhibit the generation of vortex, and eliminate the vortex-induced vibration of the main beam, thereby improving the driving comfort and safety and being beneficial to prolonging the service life of the bridge.
The present invention will be further described with reference to the accompanying drawings to fully illustrate the objects, technical features and technical effects of the present invention.
Drawings
FIG. 1 is a schematic structural view of a cross section of an I-shaped composite beam provided with a pneumatic device;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a sectional view taken along the direction B-B of FIG. 2 showing the positional relationship of the baffle stiffener, the I-beam bottom plate and the steel cross beam;
FIG. 4 is an enlarged schematic view of the portion C of FIG. 2;
FIG. 5 is a graph of vertical vortex-induced vibration of a bridge girder at various angles of attack without a pneumatic device;
fig. 6 is a graph of vertical vortex-induced vibration of a bridge girder provided with a pneumatic device at various angles of attack.
Detailed Description
The technical solution of the present invention is further described by the following specific examples. The following examples are further illustrative of the present invention and are not intended to limit the scope of the present invention.
Fig. 1 to 4 show a specific embodiment of the present invention. In this embodiment, the pneumatic device for controlling the vortex vibration of the i-shaped composite beam bridge comprises a guide plate 1, a connecting piece 3 and a guide plate stiffening plate 2. One end of the guide plate 1 in the width direction is connected with the first end of the connecting piece 3; the first end of the guide plate stiffening plate 2 is connected to the surface of the guide plate 1. In a specific embodiment, the connection of the connection piece 3 to the guide plate 1 and the connection of the guide plate stiffener 2 to the guide plate 1 are all welded.
The connecting piece 3 is a semi-elliptical connecting plate, and the first end and the second end of the connecting piece 3 are both positioned on the short axis of the semi-ellipse. The second end of the connecting piece 3 is used for connecting with the outer edge of the I-shaped longitudinal beam bottom plate 4 of the I-shaped superposed beam. The ratio of the minor axis radius to the major axis radius of the semi-elliptical connecting plate is 1: 2. In one embodiment, the semi-elliptical webs have a minor axis radius of 7.5cm and a major axis radius of 15 cm.
When the second end of the connecting piece 3 is connected with the outer edge of the I-shaped longitudinal beam bottom plate 4 of the I-shaped superposed beam, an inclined downward included angle is formed between the guide plate 1 and the I-shaped longitudinal beam bottom plate 4, and the included angle is smaller than 90 degrees and preferably ranges from 10 degrees to 30 degrees. In a particular embodiment, the baffle 1 has a vertical height H of 27cm and a width W of 150 cm. The length of the guide plate 1 is the same as that of the I-shaped longitudinal beam bottom plate 4 in the direction of the bridge axis DE.
The second end of the air deflector stiffener 2 is opposite to the first end of the air deflector stiffener 2, and the length S of the air deflector stiffener 2 is 1/2 of the width of the i-shaped longitudinal beam bottom plate 4. The number of the guide plate stiffening plates 2 is n, the guide plates 1 are arranged into 1 row, and n is larger than 1. n is equal to the number of the steel beams 6 of the i-shaped composite beam, and the guide plate stiffening plates 2 are arranged corresponding to the positions of the steel beams 6 (as shown in fig. 3 and 4).
When in use, the second end part of the connecting piece 3 is connected with the outer edge of the H-shaped longitudinal beam bottom plate 4, so that the included angle is inclined downwards and is smaller than 90 degrees; and connecting the second end part of the guide plate stiffening plate 2 with the plate surface of the I-shaped longitudinal beam bottom plate 4. In one embodiment both connections are welded. Two pneumatic devices are respectively arranged below the bottom plates of the I-shaped longitudinal beams on two sides of the I-shaped superposed beam, and preferably, the two pneumatic devices are arranged in axial symmetry.
The position relation between each part of the pneumatic device and the I-shaped superposed beam is as follows: the guide plate 1 is positioned between the I-shaped longitudinal beam bottom plate 4 of the I-shaped superposed beam and the track of the maintenance vehicle. The two guide plates 1 are symmetrically arranged below the I-shaped longitudinal beam bottom plates 4 on two sides of the bridge along the whole length direction of the axis DE of the bridge. The maintenance vehicle track comprises a maintenance vehicle truss 5 and a maintenance vehicle suspension bracket 7. The guide plate 1 is located the outside of tool car mounted frame 7, has certain distance between the two, ensures that tool car mounted frame 7 can not conflict with guide plate 1. The horizontal height of the lower edge of the guide plate 1 is higher than that of the top surface of the maintenance vehicle truss 5. When the distance between the maintenance vehicle truss 5 and the I-shaped longitudinal beam bottom plate 4 is increased, the angle range of the included angle between the guide plate 1 and the I-shaped longitudinal beam bottom plate 4 which is allowed to be adjusted is larger. In a specific embodiment, the distance between the maintenance vehicle truss 5 and the H-shaped longitudinal beam bottom plate 4 is 60cm, the included angle is 10 degrees, the width of the guide plate 1 is 150cm, the radius of the short axis of the semi-elliptic connecting plate is 7.5cm, and the radius of the long axis is 15 cm. The distance between the maintenance vehicle truss 5 and the I-shaped longitudinal beam bottom plate 4 is at least 60 cm.
The guide plate stiffening plate 2 is arranged between the guide plate 1 and the I-shaped longitudinal beam bottom plate 4. In a particular embodiment, the third end 21 and the fourth end 22 of the deflector stiffener 2 are both at a distance 1/4 of the width of the i-stringer base plate 4 from the center line FG of the i-stringer base plate 4. For example, the third end 21 and the fourth end 22 of the baffle stiffener 2 are located at a distance of 37.5cm from the center line FG of the i-shaped stringer base plate 4, and the width of the i-shaped stringer base plate 4 is 150 cm.
Vortex vibration test
The results of the vortex-induced vibration test of the girder segment model of the i-shaped superposed beam bridge show that the girder without any pneumatic measure generates obvious vertical vortex-induced vibration (shown in fig. 5) at each attack angle, wherein the maximum vertical amplitude of the girder at the attack angle of +5 degrees is close to the allowable amplitude, the vertical amplitudes of the rest attack angles obviously exceed the allowable amplitude, and two vertical vortex-induced vibration regions exist.
The test result after the pneumatic device is installed on the main beam is shown in fig. 6, and it can be known from fig. 6 that the vertical amplitude of the vortex-induced vibration of the segment model is significantly reduced, the maximum vertical amplitude is 17mm, and the requirement of the specification tolerance value is met. The corresponding pneumatic device specific parameters in fig. 6 are: the included angle between the guide plate 1 and the H-shaped longitudinal beam bottom plate 4 is 10 degrees, the width of the guide plate 1 is 150cm, the radius of the short axis of the semi-elliptical connecting plate is 7.5cm (convenient for internal maintenance), and the radius of the long axis is 15 cm. In fact, the effect shown in fig. 6 can be substantially achieved as long as the horizontal height of the lower edge of the air deflector 1 is higher than the horizontal height of the top surface of the maintenance vehicle truss 5, and the included angle between the air deflector 1 and the i-shaped longitudinal beam bottom plate 4 is in the range of 10 ° to 30 °.
And (4) test conclusion: according to the vortex-induced vibration test result of the I-shaped superposed beam main beam segment model, the guide plate is arranged at the bottom of the I-shaped beam, so that the vertical amplitude of vortex-induced vibration can be effectively reduced, and the generation of vortex-induced vibration response is inhibited.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A pneumatic device for controlling vortex vibration of an I-shaped composite beam bridge is characterized by comprising a guide plate, a connecting piece and a guide plate stiffening plate; one end of the guide plate in the width direction is connected with the first end of the connecting piece; the second end part of the connecting piece is used for being connected with the outer edge of an I-shaped longitudinal beam bottom plate of the I-shaped superposed beam, so that an inclined downward included angle of 10-30 degrees is formed between the guide plate and the I-shaped longitudinal beam bottom plate; the first end part of the guide plate stiffening plate is connected with the plate surface of the guide plate; the second end part of the guide plate stiffening plate, which is opposite to the first end part of the guide plate stiffening plate, is used for being connected with the plate surface of the I-shaped longitudinal beam bottom plate; the connecting piece is a semi-elliptical connecting plate, and the first end of the connecting piece and the second end of the connecting piece are both positioned on a short axis of the semi-ellipse.
2. The pneumatic device for controlling vortex vibration of an i-shaped composite beam bridge according to claim 1, wherein the length of the flow guide plate is the same as the length of the i-shaped longitudinal beam bottom plate in the axial direction of the bridge.
3. The aerodynamic device for i-beam composite beam bridge vortex vibration control of claim 1 wherein the length of the second end of said baffle stiffener is 1/2 the width of the bottom slab of said i-beam.
4. The pneumatic device for controlling vortex vibration of an I-shaped composite beam bridge according to claim 1, wherein the number of the flow guide plate stiffening plates is n, the flow guide plates are arranged in 1 row, and n is greater than 1.
5. The pneumatic device for I-shaped composite beam bridge vortex vibration control as claimed in claim 4, wherein n is equal to the number of steel cross beams of the I-shaped composite beam, and the guide plate stiffening plates are arranged corresponding to the positions of the steel cross beams.
6. The pneumatic device for i-beam composite beam bridge vortex vibration control of claim 1, wherein the ratio of the minor axis radius to the major axis radius of the semi-elliptical web is 1: 2.
7. Use of a pneumatic device for i-beam bridge vortex oscillation control according to any one of claims 1 to 6, wherein the second end of the connecting member is connected to the outer edge of the i-beam bottom plate such that the angle is inclined downwards and less than 90 °; and connecting the second end part of the guide plate stiffening plate with the plate surface of the I-shaped longitudinal beam bottom plate.
8. The use of claim 7 wherein two said pneumatic devices are mounted below said i-beam bottom panels on either side of an i-beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211820.4A CN110886193B (en) | 2019-12-02 | 2019-12-02 | Pneumatic device for controlling vortex vibration of I-shaped superposed beam bridge and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911211820.4A CN110886193B (en) | 2019-12-02 | 2019-12-02 | Pneumatic device for controlling vortex vibration of I-shaped superposed beam bridge and using method thereof |
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| CN110886193A CN110886193A (en) | 2020-03-17 |
| CN110886193B true CN110886193B (en) | 2021-06-01 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002089081A (en) * | 2000-09-13 | 2002-03-27 | Ohbayashi Corp | Karman's vortex vibration suppressing device for tower- like structure |
| CN201372406Y (en) * | 2009-02-19 | 2009-12-30 | 同济大学 | Guide plate device used for vortex vibration control of separative box-girder bridge |
| CN203593947U (en) * | 2013-12-02 | 2014-05-14 | 西南交通大学 | Guide plate assembly for control of vortex-excited vibration of bridge with bluff body superposed beam |
| CN203639800U (en) * | 2013-09-18 | 2014-06-11 | 中交公路长大桥建设国家工程研究中心有限公司 | Split streamline steel-concrete composite box girder |
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2019
- 2019-12-02 CN CN201911211820.4A patent/CN110886193B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002089081A (en) * | 2000-09-13 | 2002-03-27 | Ohbayashi Corp | Karman's vortex vibration suppressing device for tower- like structure |
| CN201372406Y (en) * | 2009-02-19 | 2009-12-30 | 同济大学 | Guide plate device used for vortex vibration control of separative box-girder bridge |
| CN203639800U (en) * | 2013-09-18 | 2014-06-11 | 中交公路长大桥建设国家工程研究中心有限公司 | Split streamline steel-concrete composite box girder |
| CN203593947U (en) * | 2013-12-02 | 2014-05-14 | 西南交通大学 | Guide plate assembly for control of vortex-excited vibration of bridge with bluff body superposed beam |
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| CN110886193A (en) | 2020-03-17 |
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Granted publication date: 20210601 Termination date: 20211202 |