CN108221642B - Pneumatic structure for improving wind vibration performance of H-shaped blunt body structure of bridge - Google Patents
Pneumatic structure for improving wind vibration performance of H-shaped blunt body structure of bridge Download PDFInfo
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- CN108221642B CN108221642B CN201810015579.7A CN201810015579A CN108221642B CN 108221642 B CN108221642 B CN 108221642B CN 201810015579 A CN201810015579 A CN 201810015579A CN 108221642 B CN108221642 B CN 108221642B
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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
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Abstract
The invention provides a pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure, which is realized by adding pneumatic stabilizing plates symmetrically distributed along a web plate.
Description
Technical Field
The invention relates to a pneumatic vibration suppression measure, in particular to a pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure.
Background
The H-shaped cross-section structure is widely applied in practical life, such as a suspender of an arch bridge, a chord member of a truss bridge, a bearing bracket of a large-span roof structure and the like. Research shows that fluid can generate strong airflow separation around an H-shaped section, vortex with large scale can be generated, regular vortex shedding can be generated in a certain Reynolds number range, aerodynamic force in a downstream direction and a vertical incoming direction is generated on an object, vibration, fatigue and even damage are caused to a structure, such as galloping, flutter and vortex vibration can be generated on a suspender and a chord of a truss bridge under the action of wind, and the reliability and the safety of the structure can be affected when the vibration is serious.
The existing bridge vibration suppression measures mainly comprise three major types of mechanical measures, structural measures and pneumatic measures, the mechanical measures and the structural measures are often complicated in design and high in manufacturing cost, and the pneumatic measures are often adopted. At present, a method of opening web plates and wing plates is often adopted on a bridge suspender to restrain the vibration of the suspender. Practical application finds that the surface opening of the H-shaped suspender is difficult to operate during construction, and bending instability phenomenon is easy to occur to some compression-resistant suspenders, so that the strength and the stability cannot meet the requirements.
The Chinese patent 'a chamfer square bridge tower wind-induced vibration suppression structure' (bulletin No. CN203684092U, publication No. 2014.07.02) discloses that the flow guide wing plate with a rectangular section is utilized to improve the critical speed of the bridge tower and the stability of the bridge tower, and further provides the relation between the ventilation rate and the critical speed and the stability of the bridge tower. But it is disadvantageous in that: 1) The publication only provides a vibration suppressing structure suitable for wind-induced vibration of a bridge tower with square section in a bridge, is not suitable for other vertical components except for components such as the bridge tower, and is especially not suitable for components such as a suspender with H-shaped section with very large slenderness ratio; 2) The structure of the flow guide wing plate disclosed in the patent still has surface holes, and the construction and installation procedures and difficulties are increased.
Disclosure of Invention
The invention aims to provide a pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the bridge H-shaped blunt body structure comprises (rectangular flat plate-shaped) pneumatic stabilizing plates symmetrically arranged on two sides of a web plate of the bridge H-shaped blunt body structure (namely, one pneumatic stabilizing plate is correspondingly arranged on each side of the web plate of the bridge H-shaped blunt body structure, two pneumatic stabilizing plates are arranged on one bridge H-shaped blunt body structure), the plane where the pneumatic stabilizing plates are perpendicular to the web plate, the planes where the pneumatic stabilizing plates are respectively parallel to the two flange plates of the bridge H-shaped blunt body structure or form an included angle which is not 90 degrees (for example, the inclination angle is controlled to be approximately parallel within 20 degrees), and a gap for air flow (which flows from one flange plate to the other flange plate) to pass through is reserved between the pneumatic stabilizing plates and the web plate.
The pneumatic stabilizing plate is connected with the upright posts (the upright posts are the same in height) which are arranged on the web plate of the bridge H-shaped blunt body structure at certain intervals.
The distance from the pneumatic stabilizer plate to the two flanges of the H-shaped blunt body structure of the bridge is equal.
The pneumatic stabilizing plates are symmetrically arranged on two sides of the central axis of the web plate of the bridge H-shaped blunt body structure.
The pneumatic stabilizing plates are arranged along the forward bridge direction.
The length of the pneumatic stabilizing plate is equal to the length of the bridge H-shaped blunt body structure (namely, the pneumatic stabilizing plate is arranged in a full length mode).
The size of the gap between the web plate of the bridge H-shaped blunt body structure and the pneumatic stabilizing plate is 1/5-1/2 times of the width H1 of the flange of the bridge H-shaped blunt body structure (in order to achieve the best vibration inhibiting effect, the size of the gap between the web plate of the bridge H-shaped blunt body structure and the pneumatic stabilizing plate is 1/2 times of the width H1 of the flange of the bridge H-shaped blunt body structure).
The width of the pneumatic stabilizing plate is 2/3-5/6 times of the width H1 of the flange of the H-shaped blunt body structure of the bridge (in order to achieve the optimal vibration inhibiting effect, the width of the pneumatic stabilizing plate is 2/3 times of the width H1 of the flange of the H-shaped blunt body structure of the bridge).
The distance between the top end of the pneumatic stabilizing plate and the top of the side wing edge is 1/2-2/3 times of the width H1 of the flange of the H-shaped blunt body structure of the bridge (in order to achieve the best vibration inhibiting effect, the distance between the top end of the pneumatic stabilizing plate and the top of the side wing edge is 2/3 times of the width H of the flange of the H-shaped blunt body structure of the bridge).
The beneficial effects of the invention are as follows:
according to the invention, the pneumatic stabilizing plate is arranged (the pneumatic stabilizing plate can collide with the vortex generated by air flow separation at the flange, and meanwhile, a gap between the pneumatic stabilizing plate and the web plate allows part of air flow to pass through, so that the scale of each vortex is more strongly limited), the relaxation force coefficient of the H-shaped blunt body structure of the bridge is obviously improved, the relaxation phenomenon of the H-shaped blunt body structure (such as an H-shaped suspender, a chord member and the like) of the bridge is well restrained, and compared with the existing pneumatic measure, the pneumatic stabilizing plate has the advantages of convenience in processing and manufacturing, simplicity in construction, obvious vibration restraining effect and capability of improving the wind resistance stability.
Furthermore, the invention has good effect on inhibiting vortex-induced vibration by controlling the dimension parameters of the pneumatic stabilizing plate, and improves the vibration inhibiting effect of the pneumatic structure.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of an H-boom with an air stabilizer plate added;
FIG. 3 is a graph showing the variation of vertical bending amplitude of an original H-shaped suspender (original section) and a suspender with a pneumatic stabilizer plate according to wind speed, which are obtained by wind tunnel vibration measurement test;
FIG. 4 is a flow field wind velocity trace plot wherein: (a) Is a non-pneumatic stabilizing plate, and (b) is a pneumatic stabilizing plate;
FIG. 5 is a graph of flow field wind speed vorticity, wherein: (a) Is a non-pneumatic stabilizing plate, and (b) is a pneumatic stabilizing plate;
FIG. 6 is a graph of the dimensions of the parameters for optimum vibration suppression of the air stabilizer plate;
in the figure: 1 represents a web plate, 2 represents a flange plate, and 3 represents a pneumatic stabilizing plate; d1 is the distance from the lower end (inner end) of the pneumatic stabilizer plate to the web, D2 is the width of the pneumatic stabilizer plate, and D3 is the distance from the top (outer end) of the pneumatic stabilizer plate to the flange (near) end; b is the interval between two wing edges (namely the width of the web); h1 is the flange width.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
Aiming at the problem of H-shaped suspender relaxation, the invention adopts the pneumatic plate measure, changes the airflow form of the surface of the structure (H-shaped section), improves the coefficient of relaxation force of the surface of the H-shaped suspender, and inhibits relaxation. The pneumatic plate measure specifically comprises pneumatic stabilizing plates 3 arranged outside two sides of an H-shaped suspender web 1, the stabilizing plates are flat plates, the pneumatic stabilizing plates 3 are perpendicular to the plane where the central axis of the H-shaped suspender web is located, and the orthographic projection of the pneumatic stabilizing plates 3 on the H-shaped suspender web 1 is overlapped with the central axis (the pneumatic stabilizing plates are parallel to the two flange plates 2). The length of the pneumatic stabilizing plate 3 is equal to that of the H-shaped hanging rod, and the H-shaped hanging rod after the pneumatic stabilizing plate is added is shown in figure 1.
TABLE 1 comparison of results of prior section and different pneumatic plate measures
Note that: h1 is the width of the flange plate, D1 is the distance from the lower end of the pneumatic stabilizer plate to the web plate, D2 is the width of the pneumatic stabilizer plate, D3 is the distance from the top of the pneumatic stabilizer plate to the end of the flange, and the specific diagram is shown in FIG. 2
Table 1 shows the calculation results of 5 different working conditions, working condition 1 is the original H-shaped suspender without the pneumatic stabilizing plate, and working conditions 2 to 5 are the gaps between the pneumatic stabilizing plate and the web plate respectivelyThe gap width and the distance between the pneumatic stabilizer plate and the flange (the value of D2 is determined) are continuously increased. As can be seen from table 1: after the pneumatic stabilizing plate is introduced, the relaxation force coefficient of the H-shaped suspenderThe value of the air plate is increased along with the increase of the gap width and the distance of the air plate higher than the flange, which shows that the air plate measure can effectively improve the H-shaped suspender relaxation force coefficient and inhibit the occurrence of relaxation, and the graph 3 (the law of amplitude variation along with wind speed) obtained by wind tunnel test also verifies the conclusion that the air plate measure can eliminate the relaxation; meanwhile, according to fig. 3, the larger the gap width and the distance between the pneumatic plate and the flange are, the smaller the vortex vibration amplitude is, and the better the pneumatic performance is. From the viewpoints of vibration resistance and material saving, when the gap width between the pneumatic stabilizing plate and the web plate is 1/2 times of the flange width and the distance between the pneumatic stabilizing plate and the web plate is 2/3 times of the flange width, the vibration suppressing effect is best, and the material for the pneumatic stabilizing plate is most saved, so that the working condition 5 is the optimal size scheme (figure 6) of the pneumatic plate measures.
Figures 4 and 5 show H-boom flow field traces and flow field vorticity with and without pneumatic stabilizing plates, respectively. Analysis shows that when the pneumatic stabilizing plate is not arranged, when the original section (H-shaped) is perpendicular to the direction of the flange, the separated flow generated by the airflow at the end part of the upstream flange generates vortex with large single dimension on the upper side and the lower side of the web plate, the action range covers the section of the whole H-shaped suspender, the vortex quantity is large, and large lift force is generated, so that the phenomenon of relaxation and vibration easily occurs; after the pneumatic stabilizing plates are respectively arranged on two sides of the web plate, vortex generated by air flow separation at the upstream flange collides with the pneumatic stabilizing plates from the middle part of the section, so that the original vortex with larger scale is broken into a plurality of vortices with smaller scale, and meanwhile, a gap between the pneumatic stabilizing plates and the web plate allows part of air flow to pass through, so that the scale of each vortex is more strongly limited. By means of the measures, the influence range of gas bypass flow on the cross section is greatly reduced, the self-excitation force generated on the cross section is far smaller than the critical state of relaxation, and the occurrence of relaxation is restrained.
At the same time, by constant optimization of the aerodynamic plate measure dimension parameters (e.g. table 1), the vortex vibration (generated by the aerodynamic stabilization plate) is also limited to very small amplitudes. Therefore, the pneumatic plate measures have good control effect on the H-shaped section vibration phenomenon.
In addition, referring to fig. 1, after the distance (gap width) between the pneumatic stabilizer plate and the web of the H-shaped boom is determined, the pneumatic stabilizer plate may be mounted by welding with the posts (extending from the web) disposed on the two side surfaces of the web at a certain distance, and the distance between the posts may ensure the overall strength, rigidity and stability of the pneumatic stabilizer plate.
According to the results of table 1 and fig. 3, 4 and 5, the occurrence of the galloping of the H-shaped boom of the bridge can be suppressed by adopting the pneumatic plate measure of the invention. Meanwhile, compared with other vibration suppression measures in the prior art, the invention has the advantages that the processing is simple and convenient, the relaxation force coefficient of H-shaped blunt body structures of bridges such as suspenders, chords and the like can be increased, and the vibration suppression efficiency is higher. The invention can be singly used as an effective vibration suppression measure, and can also be combined with other vibration suppression measures for use.
Claims (5)
1. The utility model provides a improve pneumatic structure of bridge H blunt body structure wind vibration performance which characterized in that: the bridge H-shaped blunt body structure comprises two pneumatic stabilizing plates (3) symmetrically arranged on two sides of a web plate (1) of the bridge H-shaped blunt body structure, wherein the plane of the pneumatic stabilizing plates (3) is perpendicular to the web plate (1), the planes of the pneumatic stabilizing plates (3) are respectively parallel to two flange plates (2) of the bridge H-shaped blunt body structure, and a gap for air flow to pass through is reserved between the pneumatic stabilizing plates (3) and the web plate (1);
the distance from the pneumatic stabilizing plate (3) to two flanges of the H-shaped blunt body structure of the bridge is equal;
the length of the pneumatic stabilizing plate (3) is equal to the length of the bridge H-shaped blunt body structure;
the size of a gap between a web plate (1) of the bridge H-shaped blunt body structure and the pneumatic stabilizing plate (3) is 1/5-1/2 times of the width H1 of a flange of the bridge H-shaped blunt body structure;
the distance that the pneumatic stabilizing plate (3) is higher than the flange on the same side is 1/2-2/3 times of the width H1 of the flange of the bridge H-shaped blunt body structure.
2. The pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure according to claim 1, wherein the pneumatic structure is characterized in that: the pneumatic stabilizing plates (3) are connected with the upright posts arranged on the web plate (1) of the bridge H-shaped blunt body structure at certain intervals.
3. The pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure according to claim 1, wherein the pneumatic structure is characterized in that: the pneumatic stabilizing plates (3) are symmetrically arranged on two sides of the central axis of the web plate (1) of the bridge H-shaped blunt body structure.
4. The pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure according to claim 1, wherein the pneumatic structure is characterized in that: the pneumatic stabilizing plates (3) are arranged along the forward bridge direction.
5. The pneumatic structure for improving wind vibration performance of a bridge H-shaped blunt body structure according to claim 1, wherein the pneumatic structure is characterized in that: the width of the pneumatic stabilizing plate (3) is 2/3-5/6 times of the width H1 of the flange of the bridge H-shaped blunt body structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810015579.7A CN108221642B (en) | 2018-01-08 | 2018-01-08 | Pneumatic structure for improving wind vibration performance of H-shaped blunt body structure of bridge |
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| CN201810015579.7A CN108221642B (en) | 2018-01-08 | 2018-01-08 | Pneumatic structure for improving wind vibration performance of H-shaped blunt body structure of bridge |
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| CN108221642A CN108221642A (en) | 2018-06-29 |
| CN108221642B true CN108221642B (en) | 2023-07-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161774B (en) * | 2020-11-03 | 2022-05-06 | 长安大学 | Wind tunnel experiment device for three-degree-of-freedom coupled vibration under large wind attack angle |
| CN112853937B (en) * | 2021-03-12 | 2022-08-09 | 长安大学 | Wind vibration suppression device for large-span straight web steel box girder bridge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047236U (en) * | 1973-08-29 | 1975-05-10 | ||
| JP2006057436A (en) * | 2004-07-23 | 2006-03-02 | Mitsubishi Heavy Ind Ltd | Girder type bridge |
| CN102409887A (en) * | 2011-08-08 | 2012-04-11 | 中铁第一勘察设计院集团有限公司 | Wind-resistant H-shaped steel column for high-speed railway contact network and method for determining aperture ratio of wind-resistant H-shaped steel column |
| CN103590323A (en) * | 2013-11-29 | 2014-02-19 | 西南交通大学 | Wind-induced vibration suppressing structure of chamfering square bridge tower |
| CN104233946A (en) * | 2014-09-22 | 2014-12-24 | 长安大学 | Pneumatic structure for inhibiting vortex-induced resonance of bridge cylindrical suspender |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952974A (en) * | 2013-11-29 | 2014-07-30 | 西南交通大学 | Wind-induced vibration suppression structure of square chamfered bridge tower |
| CN208328658U (en) * | 2018-01-08 | 2019-01-04 | 长安大学 | A kind of pneumatic structure inhibiting bridge H-type bluff body Structure Galloping |
-
2018
- 2018-01-08 CN CN201810015579.7A patent/CN108221642B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047236U (en) * | 1973-08-29 | 1975-05-10 | ||
| JP2006057436A (en) * | 2004-07-23 | 2006-03-02 | Mitsubishi Heavy Ind Ltd | Girder type bridge |
| CN102409887A (en) * | 2011-08-08 | 2012-04-11 | 中铁第一勘察设计院集团有限公司 | Wind-resistant H-shaped steel column for high-speed railway contact network and method for determining aperture ratio of wind-resistant H-shaped steel column |
| CN103590323A (en) * | 2013-11-29 | 2014-02-19 | 西南交通大学 | Wind-induced vibration suppressing structure of chamfering square bridge tower |
| CN104233946A (en) * | 2014-09-22 | 2014-12-24 | 长安大学 | Pneumatic structure for inhibiting vortex-induced resonance of bridge cylindrical suspender |
Non-Patent Citations (1)
| Title |
|---|
| 不同腹板开孔率下H型吊杆的气动稳定性研究;刘慕广;陈政清;;振动与冲击(第03期);第30-34页 * |
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