CN101736687B - Pneumatic control device for improving flutter stability of steel trussed girder suspension bridge - Google Patents
Pneumatic control device for improving flutter stability of steel trussed girder suspension bridge Download PDFInfo
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- CN101736687B CN101736687B CN 200810226680 CN200810226680A CN101736687B CN 101736687 B CN101736687 B CN 101736687B CN 200810226680 CN200810226680 CN 200810226680 CN 200810226680 A CN200810226680 A CN 200810226680A CN 101736687 B CN101736687 B CN 101736687B
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Abstract
The invention provides a pneumatic control device for improving flutter stability of a steel trussed girder suspension bridge, which relates to the bridge technology. The device of the invention is a combination of bridge deck central slotting and pneumatic wing plates, wherein, the width of the slotting is 1/100-1/10 of the width of the steel trussed girder; thetwo pneumatic wing plates are symmetrically installed on two sides of the steel trussed girder and arranged longitudinally and continuously along the bridge, wherein, the total arrangement length is 1/2-1 time of the span length of a midspan area of a main span; the two pneumatic wing plates are arranged vertically along the bridge in a single layer, double layer or multilayer mode; the width of each pneumatic wing plate is 1/30-1/10 of the width of the steel trussed girder; the horizontal distance from the centers of the pneumatic wing plates to a center longitudinal axis of the bridge is 1/3-1/2 of the width of the steel trussed girder, and the vertical distance from the centers of the pneumatic wing plates to the bottom of the steel trussed girder is 1/4-1/2 of the height of the steel trussed girder; and the cross sections of the pneumatic wing plates are in an elliptic shape, or a flat plate shape with a round end or a triangle air nozzle. The pneumatic control device changes the air flow characteristic of the steel trussed girder, obviously improves the flutter stability of the steel trussed girder suspension bridge, and has simple structure, convenient installation and good economical efficiency.
Description
Technical field
The present invention relates to technical field of bridge engineering, is a kind of be used to improve the bridge deck central slot of flutter stability of steel trussed girder suspension bridge and combined pneumatic control device of pneumatic wing plate.
Background technology
Steel truss girder is to stride a kind of common stiff girder form of suspension bridge greatly.When the wind speed of striding steel trussed girder suspension bridge bridge location place greatly was higher, the flutter stability of bridge usually can not satisfy the wind force proofing design requirement.For the purpose of economy, need take some pneumatic control measures to improve the flutter stability of bridge usually.At present, some aerodynamic Measures have obtained application in steel trussed girder suspension bridge, comprising: deck centre fluting, central steadying plate, or the like.
Result of the test shows that the deck centre fluting is very big to the flutter stability influence of bridge, and the Flutter Control effect of fluting is relevant with groove width.But, at present the deck centre fluting is studied system not enough, the physical relationship of groove width and bridge critical wind speed of flutter also is worth inquiring into.The big ring door bridge of Japan and alum strait Bridge etc. have been installed central steadying plate on steel truss girder, improved the critical wind speed of flutter of bridge.Recently, cross a river bridge and north, Guizhou dish Jiang Daqiao of Rong Xisi, Shanghai of building of China also taked the aerodynamic Measures of central steadying plate.But the control effect of central steadying plate and its highly have much relations, and the resistance coefficient that has increased bridge behind the central steadying plate is set.
Summary of the invention
The purpose of this invention is to provide a kind of air control unit that is used to improve flutter stability of steel trussed girder suspension bridge, can effectively improve the flutter stability of steel trussed girder suspension bridge.
To achieve these goals, technical solution of the present invention is:
A kind of air control unit that is used to improve flutter stability of steel trussed girder suspension bridge is at bridge deck central slot 1, and central slot 1 is arranged continuously to full-bridge along vertical bridge, bridge deck 3 are divided into left and right two width of cloth; It is characterized in that: on steel truss 4, also be provided with pneumatic wing plate 2; Wherein, central slot 1 width is 1/100～1/10 times of steel truss girder width; Two pneumatic wing plates 2 are horizontally disposed with, be installed in the inside, both sides of steel truss 4 by column 5 and longeron 6 symmetries, vertically be arranged in bridge main span span centre zone continuously along bridge, arranging that total length is 1/2～1 times of bridge main span span centre zone span, is individual layer, bilayer or multilayer along the vertical arrangement of bridge.
Described air control unit, its described pneumatic wing plate 2 adopt density little and alloy or composite material that rigidity is big are made; Pneumatic wing plate 2 forms an integral body by most section assemblings, and pneumatic wing plate 2 two ends of shaping are for sealing; Each pneumatic wing plate sections length is 1/5～1 times of steel truss girder sections length, and the width of pneumatic wing plate 2 is 1/30～1/10 times of steel truss girder width; Each pneumatic wing plate sections by bolt, rivet or be weldingly fixed on column 5 tops, column 5 lower ends are by bolt or be weldingly fixed on the longeron 6, longeron 6 two ends are by bolt or be weldingly fixed on inside, steel truss 4 both sides.
Described air control unit, its described pneumatic wing plate 2 axis are 1/3～1/2 times of steel truss girder width to the horizontal range of bridge central longitudinal axis, are 1/4～1/2 times of steel truss height to the vertical distance of steel truss girder bottom.
Described air control unit, its described pneumatic wing plate 2 vertically is individual layer, bilayer or multilayer along bridge, bilayer or multilayer pneumatic wing plate are evenly at interval to be provided with up and down on column 5 tops, and bilayer or the multilayer pneumatic wing plate vertical distance between up and down is 1/2～1 times of pneumatic wing plate width.
Described air control unit, the cross section profile of its described pneumatic wing plate 2 is an ellipse, or is with the plate of nose circle or band triangle tuyere, its major axis is horizontally disposed with.
Described air control unit, its described each pneumatic wing plate sections by bolt, rivet or be weldingly fixed at least two root posts 5, column 5 is uniformly distributed on the soffit axis of pneumatic wing plate sections, and the spacing of column 5 is 1/5～1 times of steel truss sections length; Each column 5 lower end is by bolt or be weldingly fixed on the longeron 6, and the length of every section longeron 6 is 1～2 times of steel truss girder sections length.
The present invention is directed to the some shortcomings that exist in the existing steel trussed girder suspension bridge Flutter Control measure, at first improve flutter stability, studied the Flutter Control effect of different deck centre groove widths by central slot being set at bridge deck.In order further to improve the critical wind speed of flutter of bridge, a kind of novel pneumatic measure---pneumatic wing plate has been installed on steel truss girder.Pneumatic wing plate can increase the resistance coefficient of steel truss girder hardly, and it is simple in structure, the deadweight is very light, installs and checks easy to maintenancely, and economic performance is good.
Description of drawings
Fig. 1 bridge deck central slot of the present invention schematic diagram;
Fig. 2 pneumatic wing plate of the present invention is vertically arranged schematic diagram continuously along bridge;
Correlation schematic diagram between Fig. 3 pneumatic wing plate of the present invention and column, longeron and the steel truss;
Fig. 4 individual layer pneumatic wing plate of the present invention and bridge deck central slot combined pneumatic control device schematic diagram;
Double-deck pneumatic wing plate of Fig. 5 the present invention and bridge deck central slot combined pneumatic control device schematic diagram;
The disciform pneumatic wing plate sections of Fig. 6 the present invention schematic diagram;
The pneumatic wing plate sections schematic diagram that Fig. 7 band nose circle of the present invention is plate;
The pneumatic wing plate sections schematic diagram that Fig. 8 band tuyere of the present invention is plate.
Mark in the accompanying drawing:
Bridge deck central slot 1; Pneumatic wing plate 2; Bridge deck 3; Steel truss 4; Column 5; Longeron 6; Bridge main span span L; Pneumatic wing plate is along the vertically continuous arrangement length L of bridge
1The steel truss girder width B; The steel truss height H; Steel truss sections length C; Bridge deck central slot width d; Pneumatic wing plate width b; The pneumatic wing plate axis is to the vertical distance h of steel truss girder bottom; Vertical distance h between about the double-deck pneumatic wing plate
1The pneumatic wing plate axis is to the horizontal range e of bridge central longitudinal axis; The length l of pneumatic wing plate sections; Column spacing c; Every section longeron length f.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and example.
The present invention is provided with central slot 1 (as shown in Figure 1) in order to improve the flutter stability of steel trussed girder suspension bridge with bridge deck 3, and central slot 1 arranges continuously to full-bridge that along vertical bridge central slot 1 width is: d=1/100～1/10 steel truss girder width (B).Simultaneously, inner symmetry is installed two pneumatic wing plates 2 in the both sides of steel truss 4, and pneumatic wing plate 2 is horizontally disposed with, and fixedlys connected with steel truss 4 with longeron 6 by column 5, pneumatic wing plate 2 vertically is arranged in bridge main span span centre zone (as shown in Figure 2) continuously along bridge, and arrangement length is: L
1=1/2～1 suspension bridge main span span (L).Pneumatic wing plate 2 forms an integral body by most section assemblings, and each pneumatic wing plate sections length is: l=1/5～1 steel truss sections length (C).Each pneumatic wing plate sections is uniformly distributed in the axis of pneumatic wing plate sections on by bolt, riveted joint or fixing two root posts (as shown in Figure 3) of welding at least, and the spacing of column is: c=1/5～1 steel truss sections length (C); Each column 5 lower end is by bolt or the fixing longeron of welding, and the length of every section longeron 6 is: f=1～2 steel truss sections length (C); Longeron 6 two ends are by bolt or be weldingly fixed on inside, steel truss 4 both sides.Pneumatic wing plate 2 can adopt individual layer (as shown in Figure 4), double-deck (as shown in Figure 5) or multilayer at cross-section of bridge along the vertical arrangement of bridge, and bilayer or the multilayer pneumatic wing plate vertical distance between about in the of 2 is: h
1=1/2～1 pneumatic wing plate width (b).The cross section profile of pneumatic wing plate 2 can be plate (as Fig. 7) of ellipse (as Fig. 6), band nose circle or plate (as Fig. 8) of band triangle tuyere, and its major axis is horizontally disposed with.The width of pneumatic wing plate 2 is: b=1/30～1/10 steel truss girder width (B), pneumatic wing plate 2 adopt density little and composite material that rigidity is big is made.Pneumatic wing plate 2 axis to the horizontal range of bridge central longitudinal axis are: e=1/3～1/2 steel truss girder width (B), the vertical distance bottom steel truss girder is: h=1/4～1/2 steel truss height (H).
The present invention is a kind of air control unit that is used to improve flutter stability of steel trussed girder suspension bridge, and this measure is the achievement that obtains than choosing from a large amount of tests.According to the sections model wind tunnel test, adopt the steel truss girder critical wind speed of flutter of different central slot width as shown in table 1.Can find from table 1: when central groove width reached certain value, the critical wind speed of flutter of steel truss girder reached maximum value, and there is an optimal width in central slot.In order further to improve the flutter stability of steel truss girder, can on the basis of central slot steel truss girder, set up pneumatic wing plate.Table 2 has been listed the steel truss girder critical wind speed of flutter result of the test that adopts central slot and pneumatic groups of vanes to close air control unit, and wherein: bridge deck central slot width is d/B=0.2, and the pneumatic wing plate position is h/H=0.48, e/B=0.4.From table 2, can find, the flutter stability that individual layer pneumatic wing plate and double-deck pneumatic wing plate can improve steel truss girder effectively is installed.
Steel trussed girder suspension bridge critical wind speed of flutter (the unit: m/s) of the different bridge deck central slot of table 1 width
Table 2 adopts central slot and pneumatic groups of vanes to close the steel trussed girder suspension bridge critical wind speed of flutter (unit: m/s) of aerodynamic Measures
The present invention makes the upper and lower air-flow of bridge deck that the phase mutual interference can take place by slotting in bridge deck central authorities, produces the whirlpool that alternately comes off at the fluting position, thereby steel truss girder has been formed the positive and negative additional lift that alternately changes.This positive and negative additional lift that replaces has changed the degree of participation of the vertical degree of freedom of steel truss girder, erects coupling effect curved and twist motion thereby changed bridge construction.When the fluting section reverses in the flutter generating process and vertically the Degree-of-freedom Coupling degree improves, critical wind speed of flutter will improve.Simultaneously, because pneumatic wing plate has been installed on steel truss girder, there is phase difference in pneumatic wing plate between the aerodynamic force that the aerodynamic force that produces under the air-flow effect and steel truss girder self are subjected to, can partial offset after these the two kinds aerodynamic force stacks that have a phase difference, thus the flutter stability of steel trussed girder suspension bridge further improved.
Claims (4)
1. an air control unit that is used to improve flutter stability of steel trussed girder suspension bridge is in bridge deck central slot (1), and central slot (1) is arranged continuously to full-bridge along vertical bridge, bridge deck (3) are divided into left and right two width of cloth; It is characterized in that: on steel truss (4), also be provided with pneumatic wing plate (2); Wherein, central slot (1) width is 1/100～1/10 times of steel truss girder width; Two pneumatic wing plates (2) are horizontally disposed with, be installed in the inside, both sides of steel truss (4) by column (5) and longeron (6) symmetry, vertically be arranged in bridge main span span centre zone continuously along bridge, arranging that total length is 1/2～1 times of bridge main span span centre zone span, is individual layer, bilayer or multilayer along the vertical arrangement of bridge;
Described pneumatic wing plate (2) adopts density little and alloy or composite material that rigidity is big are made; Pneumatic wing plate (2) forms an integral body by most section assemblings, and the pneumatic wing plate of shaping (2) two ends are for sealing; Each pneumatic wing plate sections length is 1/5～1 times of steel truss girder sections length, and the width of pneumatic wing plate (2) is 1/30～1/10 times of steel truss girder width; Each pneumatic wing plate sections by bolt, rivet or be weldingly fixed on column (5) top, column (5) lower end is by bolt or be weldingly fixed on the longeron (6), longeron (6) two ends are by bolt or be weldingly fixed on steel truss (4) inside, both sides;
Described pneumatic wing plate (2) axis is 1/3～1/2 times of steel truss girder width to the horizontal range of bridge central longitudinal axis, is 1/4～1/2 times of steel truss height to the vertical distance of steel truss girder bottom.
2. air control unit according to claim 1, it is characterized in that: described pneumatic wing plate (2) vertically is individual layer, bilayer or multilayer along bridge, bilayer or multilayer pneumatic wing plate are evenly at interval to be provided with up and down on column (5) top, and bilayer or the multilayer pneumatic wing plate vertical distance between up and down is 1/2～1 times of pneumatic wing plate width.
3. air control unit according to claim 1 is characterized in that: the cross section profile of described pneumatic wing plate (2) is an ellipse, or is with the plate of nose circle or band triangle tuyere, and its major axis is horizontally disposed with.
4. air control unit according to claim 1, it is characterized in that: described each pneumatic wing plate sections by bolt, rivet or be weldingly fixed at least two root posts (5), column (5) is uniformly distributed on the soffit axis of pneumatic wing plate sections, and the spacing of column (5) is 1/5～1 times of steel truss sections length; Each column (5) lower end is by bolt or be weldingly fixed on the longeron (6), and the length of every section longeron (6) is 1～2 times of steel truss girder sections length.
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| CN 200810226680 CN101736687B (en) | 2008-11-19 | 2008-11-19 | Pneumatic control device for improving flutter stability of steel trussed girder suspension bridge |
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| CN 200810226680 CN101736687B (en) | 2008-11-19 | 2008-11-19 | Pneumatic control device for improving flutter stability of steel trussed girder suspension bridge |
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| CN101736687B true CN101736687B (en) | 2011-06-22 |
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Families Citing this family (11)
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| CN102175418B (en) * | 2010-11-30 | 2013-04-10 | 哈尔滨工业大学 | Decoupling-type free vibration suspending structure of bridge segment model |
| CN102134831A (en) * | 2011-01-05 | 2011-07-27 | 四川腾中重工机械有限公司 | Pneumatic wing plate structure for improving flutter stability of steel truss girder suspension bridge |
| CN102140776A (en) * | 2011-01-05 | 2011-08-03 | 四川腾中重工机械有限公司 | Asymmetric pneumatic wing plate for improving flutter stability of steel truss girder suspension bridge |
| CN104195934B (en) * | 2014-08-22 | 2017-05-31 | 中交公路规划设计院有限公司 | Assembly type steel bridge on highway |
| CN104631306B (en) * | 2014-12-31 | 2017-02-01 | 邓芳 | Air guide device and manufacturing and assembling method thereof |
| CN105586825A (en) * | 2016-03-01 | 2016-05-18 | 大连市市政设计研究院有限责任公司 | Wind resisting device for composite beam cable-stayed bridge |
| CN106638278B (en) * | 2017-02-26 | 2018-04-13 | 西南交通大学 | A kind of pneumatic construction for improving double-deck highway steel trusses suspension bridge Flutter Performance |
| CN107059591A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | A kind of plate girder Combined steel truss beam bridge flutter vibration suppression construction |
| CN107587417A (en) * | 2017-09-27 | 2018-01-16 | 中交公路长大桥建设国家工程研究中心有限公司 | Hybrid combining beam three stride continuous suspension bridge |
| CN109933830A (en) * | 2018-07-26 | 2019-06-25 | 重庆大学 | A kind of super-span suspension bridge flutter wing plate active control experimental model |
| CN112853913B (en) * | 2021-01-14 | 2022-11-18 | 中铁二十五局集团第五工程有限公司 | Horizontal splicing bridge |
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Application publication date: 20100616 Assignee: Long Highway Bridge Construction CCCC National Engineering Research Center Co., Ltd. Assignor: CCCC Highway Consultants Co., Ltd. Contract record no.: 2013990000124 Denomination of invention: Pneumatic control device for improving flutter stability of steel trussed girder suspension bridge Granted publication date: 20110622 License type: Exclusive License Record date: 20130327 |
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Effective date of registration: 20170420 Address after: The 100088 Beijing Xicheng District Main Street No. 85 309 Patentee after: In the civil public regulation of large data information technology (Beijing) Co., Ltd. Address before: 100010 Beijing City, the fourth floor before the fried noodle alley No. 33 Patentee before: CCCC Highway Consultants Co., Ltd. |