CN110306423B - Damper amplifying device for bridge - Google Patents
Damper amplifying device for bridge Download PDFInfo
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- CN110306423B CN110306423B CN201910580158.3A CN201910580158A CN110306423B CN 110306423 B CN110306423 B CN 110306423B CN 201910580158 A CN201910580158 A CN 201910580158A CN 110306423 B CN110306423 B CN 110306423B
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- damper
- bridge
- rigid arm
- displacement
- spherical hinge
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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 damper amplification device for a bridge, which relates to the field of engineering structure vibration reduction, and comprises: the damper comprises a damper, a first rigid arm and a second rigid arm; the damper, one end of the first rigid arm and one end of the second rigid arm are connected through a spherical hinge O, the other end of the damper is fixedly connected with the strut through a spherical hinge C, the other end of the first rigid arm is fixedly connected with the top of the main beam through a spherical hinge A, and the other end of the second rigid arm is fixedly connected with the bottom of the main beam or the cross beam through a spherical hinge B. The damper amplifying device for the bridge can amplify the structural displacement of the bridge, so that the displacement and the output of the damper are changed, and the damper can better play the roles of energy dissipation and shock absorption.
Description
Technical Field
The invention relates to the field of engineering structure vibration reduction, in particular to a damper amplification device for a bridge.
Background
In bridge engineering, due to factors such as natural disasters caused by earthquakes or overlong service life of bridges, structural displacement of a main beam structure system is easy to occur, namely, vertical vibration of a main beam occurs. However, the bridge main body is generally long, the midspan response is large, and the construction at the midspan position is inconvenient, so that the damper cannot be installed, and the energy dissipation and shock absorption effects cannot be achieved on the bridge.
Among the prior art, can set up damping bearing in bridge construction usually to make the bridge can play certain cushioning effect when taking place structure displacement, however, damping bearing's relative displacement is less, and when the bridge amplitude is less, damping bearing responds insensitively, and the cushioning effect that uses this method to play is not obvious, can't satisfy current demand.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a damper amplification device for a bridge, which can amplify the structural displacement of the bridge, so that the displacement and the output of a damper are changed, and the damper can better play the role of energy dissipation and shock absorption.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the utility model provides a attenuator amplification device that bridge was used, the bridge includes the crossbeam, locates girder on the crossbeam and locating pillar on the crossbeam, attenuator amplification device includes: the damper comprises a damper, a first rigid arm and a second rigid arm;
the damper, one end of the first rigid arm and one end of the second rigid arm are connected through a spherical hinge O, the other end of the damper is fixedly connected with the support through a spherical hinge C, the other end of the first rigid arm is fixedly connected with the top of the main beam through a spherical hinge A, and the other end of the second rigid arm is fixedly connected with the bottom of the main beam or the cross beam through a spherical hinge B.
On the basis of the technical scheme, the damper, the first rigid arm and the second rigid arm are coplanar.
On the basis of the technical scheme, the damper, the first rigid arm and the second rigid arm are not coplanar.
On the basis of the technical scheme, the damper is an oil damper, a magnetorheological damper or a friction damper.
On the basis of the technical scheme, the difference value between the length of the first rigid arm and the length of the second rigid arm is larger than the maximum structural displacement of the main beam.
On the basis of the technical scheme, the calculation formula of the displacement amplification factor n of the damper is as follows:
n＝|OC-O’C|/AA’
wherein OC is the length of the damper before structural displacement of the bridge, O 'C is the length of the damper after structural displacement of the bridge, and AA' is the structural displacement of the bridge.
On the basis of the technical scheme, the coordinate of the spherical hinge O before the displacement of the bridge structure is taken as an origin, the position of the spherical hinge O after the displacement of the bridge structure is taken as O ', and the coordinate of the position O ' is (x, y), then the calculation formula of the O ' coordinate is as follows:
the bridge displacement measuring device comprises a bridge generation structure, a first rigid arm, a second rigid arm, a first fixed arm, a second fixed arm, a third rigid arm, a fourth rigid arm, a fifth rigid arm, a sixth rigid arm, a fifth rigid arm, a sixth rigid arm, a.
Compared with the prior art, the invention has the advantages that: the damper amplifying device for the bridge can amplify the structural displacement of the bridge, so that the displacement and the output of the damper are changed, and the damper can better play the roles of energy dissipation and shock absorption
Drawings
FIG. 1 is a schematic structural diagram of an enlarged device of a bridge damper according to an embodiment of the present invention;
fig. 2 is a schematic coordinate diagram of a damper amplification device for a bridge according to an embodiment of the present invention.
In the figure: the beam comprises a beam 1, a girder 2, a strut 3, a damper 4, a first rigid arm 5 and a second rigid arm 6.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a damper amplification device for a bridge, where the bridge includes a cross beam 1, a main beam 2 disposed on the cross beam 1, and a pillar 3 disposed on the cross beam 1, and the damper amplification device includes: damper 4, first rigid arm 5, and second rigid arm 6.
The damper 4, the first rigid arm 5 and one end of the second rigid arm 6 are connected through a spherical hinge O, the other end of the damper 4 is fixedly connected with the support 3 through a spherical hinge C, the other end of the first rigid arm 5 is fixedly connected with the top of the main beam 2 through a spherical hinge A, and the other end of the second rigid arm 6 is fixedly connected with the bottom of the main beam 2 or the cross beam 1 through a spherical hinge B.
In practical use, the damper 4, the first rigid arm 5 and the second rigid arm 6 may or may not be coplanar. The plane vibration amplification can be carried out, and the space vibration amplification can also be carried out, so that the amplification of three-dimensional vibration displacement in the bridge structure is realized.
Preferably, the damper 4 is an oil damper, a magnetorheological damper or a friction damper, and the like, is particularly suitable for dampers sensitive to displacement and speed, and can effectively improve the displacement and output of the damper, so that the damper can better play the role of energy dissipation and shock absorption.
Further, the difference value between the length of the first rigid arm 5 and the length of the second rigid arm 6 is greater than the maximum structural displacement of the main beam 2, so that the intersection point of the movable circular tracks of the first rigid arm 5 and the second rigid arm 6 is ensured to exist all the time.
Referring to fig. 2, when the damper 4, the first rigid arm 5 and the second rigid arm 6 may be coplanar, the displacement magnification n of the damper 4 is calculated by the formula:
n＝|OC-O’C|/AA’
wherein OC is the length of the damper before structural displacement of the bridge, O 'C is the length of the damper after structural displacement of the bridge, and AA' is the structural displacement of the bridge.
If the coordinate of the spherical hinge O before the displacement of the bridge generation structure is taken as the origin, the position of the spherical hinge O after the displacement of the bridge generation structure is taken as O ', and the coordinate of the position O ' is (x, y), the calculation formula of the O ' coordinate is as follows:
the method comprises the following steps that a is the projection length of a first rigid arm 5 in the vertical direction before the displacement of a bridge generation structure, alpha is the included angle between the first rigid arm 5 and the vertical direction before the displacement of the bridge generation structure, b is the projection length of a second rigid arm 6 in the vertical direction before the displacement of the bridge generation structure, beta is the included angle between the second rigid arm 6 and the vertical direction before the displacement of the bridge generation structure, d is the structural displacement generated by the bridge, a and b are positive numbers, alpha and beta are acute angles, and d is a real number.
According to the calculation formula, the different amplification factors of the damper displacement can be obtained by adjusting the projection lengths of the first rigid arm 5 and the second rigid arm 6 in the vertical direction and the included angle with the vertical direction before the displacement of the bridge generation structure.
In the embodiment of the present invention, a is 2000mm, b is 1000mm, the included angle α is 10 °, β is 5 °, a point a undergoes downward displacement AA '— 10mm, the coordinates of the intersection point are solved by a two-circle equation, and the point of the two intersection points close to the origin point O is a new damper active point O', and the calculation formula is as follows:
the coordinates of the intersection point O' are (34.46, -3.62), the displacement of the damper is-34.46 mm, and the magnification of the displacement reaches 3.45 times through a computer solution equation.
Analysis shows that the factors influencing the amplification factor mainly include the lengths of the first rigid arm 5 and the second rigid arm 6, the included angles alpha and beta, and the structural displacement d of the bridge, and the influence of each parameter on the amplification factor should be comprehensively considered during design. The influence of the structural displacement d of the bridge on the amplification factor n is analyzed respectively while keeping other parameters unchanged, and the amplification factor can reach more than 3 times as shown in table 1.
TABLE 1 influence of the magnitude of the structural displacement d on the magnification n
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (4)
1. The utility model provides a attenuator amplification device that bridge was used, the bridge includes crossbeam (1), locates girder (2) on crossbeam (1) and locate pillar (3) on crossbeam (1), its characterized in that, attenuator amplification device includes: the damper (4), the first rigid arm (5) and the second rigid arm (6);
one ends of the damper (4), the first rigid arm (5) and the second rigid arm (6) are connected through a spherical hinge O, the other end of the damper (4) is fixedly connected with the strut (3) through a spherical hinge C, the other end of the first rigid arm (5) is fixedly connected with the top of the main beam (2) through a spherical hinge A, and the other end of the second rigid arm (6) is fixedly connected with the cross beam (1) through a spherical hinge B;
the damper (4), the first rigid arm (5) and the second rigid arm (6) are coplanar;
when the bridge generates structural displacement, the spherical hinge A generates structural displacement AA 'in the vertical direction and drives the spherical hinge O to generate displacement and move to the O';
the calculation formula of the displacement amplification factor n of the damper (4) is as follows:
n＝|OC-O’C|/AA’
wherein OC is the length of the damper before structural displacement of the bridge, and O' C is the length of the damper after structural displacement of the bridge.
2. The bridge damper amplifier assembly of claim 1, wherein: the damper (4) is an oil damper, a magnetorheological damper or a friction damper.
3. The bridge damper amplifier assembly of claim 1, wherein: the difference between the length of the first rigid arm (5) and the length of the second rigid arm (6) is larger than the maximum structural displacement of the main beam (2).
4. The bridge damper amplifier assembly of claim 1, wherein: and (3) setting the coordinate of the spherical hinge O before the displacement of the bridge structure as an original point and the coordinate of the position O 'of the spherical hinge O after the displacement of the bridge structure as (x, y), and then calculating the O' coordinate according to the following formula:
the method comprises the following steps that a is the projection length of a first rigid arm (5) before the displacement of a bridge generation structure in the vertical direction, alpha is the included angle between the first rigid arm (5) before the displacement of the bridge generation structure and the vertical direction, b is the projection length of a second rigid arm (6) before the displacement of the bridge generation structure in the vertical direction, beta is the included angle between the second rigid arm (6) before the displacement of the bridge generation structure and the vertical direction, d is the structural displacement of the bridge generation structure, a and b are positive numbers, alpha and beta are acute angles, and d is a real number.
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| CN112064492B (en) * | 2020-08-17 | 2022-03-18 | 中铁大桥局集团有限公司 | Vertical vibration damping of girder and vertical damping device and large-span bridge |
| CN112064490A (en) * | 2020-08-17 | 2020-12-11 | 中铁大桥局集团有限公司 | I-shaped steel beam vibration damper and I-shaped steel combination beam |
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| KR20140069694A (en) * | 2012-11-29 | 2014-06-10 | 한국건설기술연구원 | Brace damping system having connection for preventing out plane buckling |
| CN204781415U (en) * | 2015-07-13 | 2015-11-18 | 贵州正业工程技术投资有限公司 | Attenuator amplification device |
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| CN206477463U (en) * | 2016-12-30 | 2017-09-08 | 上海建工集团股份有限公司 | For the speed and displacement amplification device of Effects of Viscous Fluid Damper |
| CN108824923A (en) * | 2018-08-29 | 2018-11-16 | 唐山铭嘉建筑设计咨询有限公司 | A kind of Double damping device amplifying device |
| CN109403488A (en) * | 2018-11-13 | 2019-03-01 | 华中科技大学 | A kind of radial type supporting damping device vibration insulating system and its vibration damping efficiency estimation method |
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2019
- 2019-06-28 CN CN201910580158.3A patent/CN110306423B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140069694A (en) * | 2012-11-29 | 2014-06-10 | 한국건설기술연구원 | Brace damping system having connection for preventing out plane buckling |
| CN204781415U (en) * | 2015-07-13 | 2015-11-18 | 贵州正业工程技术投资有限公司 | Attenuator amplification device |
| CN105239695A (en) * | 2015-11-09 | 2016-01-13 | 同济大学建筑设计研究院(集团)有限公司 | Elbow joint type deformation magnifying device |
| CN205134606U (en) * | 2015-11-23 | 2016-04-06 | 常州容大结构减振股份有限公司 | Eliminate viscous damper connected system of off -plate moment of flexure |
| CN206477463U (en) * | 2016-12-30 | 2017-09-08 | 上海建工集团股份有限公司 | For the speed and displacement amplification device of Effects of Viscous Fluid Damper |
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