CN102277830B - Cable stayed bridge and vibration-reducing auxiliary cable device for same - Google Patents
Cable stayed bridge and vibration-reducing auxiliary cable device for same Download PDFInfo
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- CN102277830B CN102277830B CN201110101365.XA CN201110101365A CN102277830B CN 102277830 B CN102277830 B CN 102277830B CN 201110101365 A CN201110101365 A CN 201110101365A CN 102277830 B CN102277830 B CN 102277830B
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Abstract
The invention relates to a cable stayed bridge and a vibration-reducing auxiliary cable device for the same. The vibration-reducing auxiliary cable device comprises a shackle, a ferrule, an auxiliary cable and an anchor device, wherein the shackle is fixedly connected to an external sleeve of each stayed main cable; the ferrule is fixed on the shackle; the auxiliary cable is made of pre-tensioned shape memory alloy, penetrates through the ferrule and is connected among each stayed main cable in series; one end of the auxiliary cable is fixed on the longest stayed main cable; and the other end of the auxiliary cable is fixed on a beam body of the cable stayed bridge through the adjustable anchor device. The auxiliary cable is made of pre-tensioned shape memory alloy, thus the auxiliary cable has excellent characteristics of shape memory alloy effect, superelasticity and the like, enhanced energy dissipating performance of the vibration-reducing auxiliary cable device, self-recover ability when the auxiliary cable is subjected to greater deformation as well as favorable durability. The auxiliary cable is connected among various stayed main cables in series to form a cable network structure system together with the stayed main cables, thus the vibration frequency and dampness of the stayed main cable can be increased and the vibration of the stayed cable caused by various outside excitations is effectively inhibited.
Description
Technical field
The invention belongs to technical field of bridge engineering, relate in particular to a kind of vibration damping lazy halyard device and cable stayed bridge for cable stayed bridge.
Background technology
Cable stayed bridge is by the tower of pressure-bearing, the rope of tension and hold a kind of structural system that curved beam body combines; It has bridge tower form changeable, can cantilever construction and the advantage such as attractive in appearance.Along with the continuous increase of cable stayed bridge span, it is more and more longer that suspension cable also becomes.As the suspension cable of the main supporting member of cable stayed bridge, there is the features such as flexibility is large, internal damping is low, intrinsic frequency distribution is wide, very easily under the excitation of wind, wind and rain and the displacement of beam tower supported end, vibrate.
Through a large amount of research, Chinese scholars find suspension cable to cause the mechanism of shaking very complicated; Can the main oscillatory type of suspension cable be divided into two kinds according to the difference of driving source: the one, by wind or simultaneous action of wind and rain, caused the vibration of suspension cable; The 2nd, the vibration that suspension cable supported end occurs under beam tower displacement effect.At present, the Main Means that suppresses Inclined Cable Vibration is Passive Control, and its major measure comprises: one is the aerodynamic characteristic with change suspension cable by change suspension cable surface configuration; Two for to set up passive damper at suspension cable close end.But because the vibration isolation of the passive damper of suspension cable for long drag-line is still restricted, many structural engineers advocate the lazy halyard method that adopts; The Main Means of this method is that each main suspension cable is interconnected, the benefit of bringing is like this: the rigidity that has improved suspension cable system integral body, improved the generalized mass of each first order mode of suspension cable, the mechanical damping and the air damping that have increased suspension cable, intercouple between each mode during Inclined Cable Vibration.
Marmem is a kind of new material that has perception concurrently and drive function, the difference of it and traditional material is to have shape memory effect and large deformation super elastic characteristics, high damping, and energy-dissipating property is good, can repeat surrender and not produce the features such as permanent deformation, good endurance; Along with the reduction of the deep and cost of studying, research and development have very large potentiality for the vibration damping lazy halyard device of cable stayed bridge.
Summary of the invention
Technical problem to be solved by this invention is, provides that a kind of energy-dissipating property is better, the vibration damping lazy halyard device for cable stayed bridge of good endurance.
Another technical problem to be solved by this invention is, a kind of cable stayed bridge is provided, and it has damping property and the good rope web frame system of durability.
For the above-mentioned vibration damping lazy halyard device for cable stayed bridge, the present invention is achieved like this, it comprises claim-reduction, cuff, lazy halyard and ground tackle, claim-reduction is connected on each oblique pull main rope outer sleeve, it is cylindric that claim-reduction is, its axis direction is parallel with the length direction of oblique pull main rope, cuff is fixed in claim-reduction, and the circumferencial direction along claim-reduction extends setting, lazy halyard is made by pretensioned marmem, it is through cuff, and be serially connected between each oblique pull main rope, its one end is fixed on the longest oblique pull main rope, the other end is fixed on the Liang Tishang of cable stayed bridge by adjustable ground tackle, lazy halyard between adjacent oblique pull main rope is two strands of pretensioned shape-memory alloy wires, two strands of shape-memory alloy wires are arranged in a crossed manner between adjacent oblique pull main rope.
Further, described cuff is provided with for lazy halyard being lock onto to the lock nut in claim-reduction.
Further, described adjustable ground tackle comprises U-shaped connector and the anchor head being fixed on cable-stayed bridge body; Anchor head comprises body and is formed on two mounting ears on body, and two mounting ears are set on U-shaped connector; One end of lazy halyard is fixed on body.
Further, described adjustable ground tackle further comprises wedge shape intermediate plate, and body is provided with to install the installing hole of lazy halyard, and wedge shape intermediate plate is arranged in installing hole, and lazy halyard is fixed in installing hole.
Further, described U-shaped connector comprises two arms, and on each arm, is all formed with thread segment; Two arms of U-shaped connector, through after mounting ear, fit together U-shaped connector and anchor head by nut.
Further, described vibration damping lazy halyard device further comprises the anchor slab being fixed on cable-stayed bridge body, and anchor slab is provided with to install the bulge loop of U-shaped connector.
Further, described lazy halyard is made by Nitinol, acid bronze alloy or ferrous alloy.
For above-mentioned a kind of cable stayed bridge, the present invention is achieved like this, it comprise pressure-bearing tower, hold curved beam body and the suspension cable of tension, suspension cable is connected between tower and beam body, described cable stayed bridge also comprises above-mentioned vibration damping lazy halyard device.
Because the lazy halyard of above-mentioned vibration damping lazy halyard device is made by pretensioned marmem, it has the good characteristics such as shape memory effect, super-elasticity, thereby can strengthen the energy-dissipating property of vibration damping lazy halyard device, while producing moderate finite deformation under external force, there is automatic recovery ability, there is good durability simultaneously.Lazy halyard is serially connected between each oblique pull main rope, forms a rope web frame system: on the one hand, marmem lazy halyard has reduced the effective length of oblique pull main rope, thereby has promoted the vibration frequency of drag-line with oblique pull main rope; On the other hand, promote the vibration damping of drag-line, can effectively suppress the vibration that drag-line causes under various dynamic excitations.Moreover that above-mentioned vibration damping lazy halyard device also has is simple in structure, construction and the advantage such as easy to maintenance.Accompanying drawing explanation
Fig. 1 is the schematic diagram of cable stayed bridge one preferred embodiment in the present invention.
Fig. 2 is the schematic diagram of vibration damping lazy halyard device one preferred embodiment in the present invention.
Fig. 3 is the schematic diagram of claim-reduction and cuff in Fig. 2.
Fig. 4 is the schematic side view of claim-reduction and cuff in Fig. 3.
Fig. 5 is the elevational schematic view of claim-reduction and cuff in Fig. 3.
Fig. 6 is the schematic diagram of the U-shaped connector of adjustable ground tackle in Fig. 1.
Fig. 7 is the schematic diagram of the anchor head of adjustable ground tackle in Fig. 1.
Fig. 8 is the schematic diagram of the wedge shape intermediate plate of adjustable ground tackle in Fig. 1.
The specific embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, is a preferred embodiment of cable stayed bridge in the present invention, and this cable stayed bridge comprises the tower 1 of pressure-bearing, the oblique pull main rope 3 that holds curved beam body 2, tension and vibration damping lazy halyard device 4.Oblique pull main rope 3 is connected between tower 1 and beam body 2.
Vibration damping lazy halyard device 4 comprises claim-reduction 41, cuff 42, pretensioned lazy halyard 43, ground tackle 44 and is anchored at the anchor slab 45 on beam body 2.Claim-reduction 41 is connected in each oblique pull main rope 3 outer sleeve (not shown)s, and it is set in the outside of oblique pull main rope 3, in two ends and 3 end anchorages of oblique pull main rope.Cuff 42 is fixed in claim-reduction 41.Lazy halyard 43 is made by marmem, and it passes cuff 42, and is serially connected between each oblique pull main rope 3, and its one end is fixed on the longest oblique pull main rope 3, and the other end is fixed on the beam body 2 of cable stayed bridge by ground tackle 44 and anchor slab 45.
Particularly, please together consult Fig. 3 to Fig. 5, each claim-reduction 41 is roughly cylindric, can be formed by two semi-circular structure 411 docking.In the present embodiment, two semi-circular structures 411 are two semi-circular shaped steel, and two semi-circular shaped steel are docking together by bolt 412, can be by oblique pull main rope 3 outer sleeve bandings.Wherein, after claim-reduction 41 is arranged on oblique pull main rope 3, the axis direction of the axis direction of claim-reduction 41 and oblique pull main rope 3 or length direction almost parallel.In other words, claim-reduction 41 be arranged in parallel with oblique pull main rope 3.
In each claim-reduction 41, be all symmetrically fixed with two cuffs 42, on each cuff 42, be respectively equipped with lock nut 421, so that lazy halyard 43 is locked in claim-reduction 41.In the present embodiment, two cuffs 42 extend and arrange along the circumferencial direction of claim-reduction 41, and in other words, the axis direction of claim-reduction 41 is substantially vertical with the plane at two cuff 42 places.Arrange like this, can guarantee through mutual vertical between the residing plane of lazy halyard 43 of cuff 42 and oblique pull main rope 3.
Lazy halyard 43 can be made by marmems such as Nitinol, acid bronze alloy or ferrous alloys, wherein preferred nitinol.Lazy halyard 43 between adjacent oblique pull main rope 3 is two strands of pretensioned shape-memory alloy wires, and two strands of shape-memory alloy wires are arranged in a crossed manner between adjacent oblique pull main rope 3.
Please together consult Fig. 6 to Fig. 8, adjustable ground tackle 44 comprises U-shaped connector 441, anchor head 442 and wedge shape intermediate plate 443.Wherein, U-shaped connector 441 comprises two arms 4411, and is all formed with thread segment on each arm 4411.Anchor head 442 comprises a body 4421 and two mounting ears 4422.On body 4421, be interval with two installing holes 4423, in order to stationary wedge intermediate plate 443 and lazy halyard 43 to be installed.Two mounting ears 4422 are arranged on the both sides of body 4421 symmetrically, for accommodating two arms 4411 of U-shaped connector 441.Two arms 4411 of U-shaped connector 441 are through after mounting ear 4422, can U-shaped connector 441 and anchor head 442 be fitted together by nut etc.Wedge shape intermediate plate 443 is arranged in installing hole 4423, in order to lazy halyard 43 is fixed on anchor head 442.
Anchor slab 45, for adjustable ground tackle 44 is fixed on to beam body 2, which is provided with a bulge loop 451, in order to U-shaped connector 441 to be installed.In use, can first anchor slab 45 be anchored on beam body 2, the bulge loop 451 again U-shaped connector 441 being passed on anchor slab 45, then load onto anchor head 442, the nut of screwing on, anchor head 442 is fixed on U-shaped connector 441, then through lazy halyard 43, finally goes up wedge shape intermediate plate 443 stretch-draw lazy halyards 43.
When vibration damping lazy halyard device 4 is arranged on cable stayed bridge, lazy halyard 43 erection sequences are installed for starting from a uppermost oblique pull main rope 3, while installing second oblique pull main rope 3, should strain lazy halyard 43, to apply suitable pretension, then by lock nut 421 locking lazy halyards 43, in the time of should guaranteeing in principle 3 vibration of oblique pull main rope, lazy halyard 43, all the time in tension state, is finally anchored on beam body 2 by adjustable ground tackle 44 and anchor slab 45.
Because the lazy halyard 43 of above-mentioned vibration damping lazy halyard device 4 is made by pretensioned marmem, it has the good characteristics such as shape memory effect, super-elasticity, thereby can strengthen the energy-dissipating property of vibration damping lazy halyard device 4, while producing moderate finite deformation under external force, there is automatic recovery ability, there is good durability simultaneously.Lazy halyard 43 is serially connected between each oblique pull main rope 3, forms a rope web frame system: on the one hand, marmem lazy halyard 43 has reduced the effective length of oblique pull main rope 3, thereby has promoted the vibration frequency of drag-line with oblique pull main rope 3; On the other hand, promoted the vibration damping of drag-line, can effectively suppress the vibration that drag-line causes under various dynamic excitations, as vortex-induced vibration, wind and rain vibration, parametric vibration and linear internal resonance.Moreover that above-mentioned vibration damping lazy halyard device 4 also has is simple in structure, construction and the advantage such as easy to maintenance.In addition, lazy halyard 43 intersections are serially connected between each oblique pull main rope 3, can further improve oscillation damping and energy dissipating effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the vibration damping lazy halyard device for cable stayed bridge, it is characterized in that, it comprises claim-reduction, cuff, lazy halyard and ground tackle, described claim-reduction is connected on each oblique pull main rope outer sleeve, described claim-reduction is cylindric, its axis direction is parallel with the length direction of oblique pull main rope, described cuff is fixed in described claim-reduction, and the circumferencial direction along described claim-reduction extends setting, described lazy halyard is made by pretensioned marmem, it is through described cuff, and be serially connected between each oblique pull main rope, its one end is fixed on the longest oblique pull main rope, the other end is fixed on the Liang Tishang of cable stayed bridge by described adjustable ground tackle, lazy halyard between adjacent oblique pull main rope is two strands of pretensioned shape-memory alloy wires, two strands of described shape-memory alloy wires are arranged in a crossed manner between adjacent oblique pull main rope.
2. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 1, is characterized in that, described cuff is provided with for described lazy halyard is lock onto to the lock nut in described claim-reduction.
3. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 1, is characterized in that, described adjustable ground tackle comprises U-shaped connector and the anchor head being fixed on cable-stayed bridge body; Described anchor head comprises body and is formed on two mounting ears on described body, and described two mounting ears are set on described U-shaped connector; One end of described lazy halyard is fixed on described body.
4. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 3, it is characterized in that, described adjustable ground tackle further comprises wedge shape intermediate plate, described body is provided with to install the installing hole of described lazy halyard, described wedge shape intermediate plate is arranged in described installing hole, and described lazy halyard is fixed in described installing hole.
5. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 3, is characterized in that, described U-shaped connector comprises two arms, and on each arm, is all formed with thread segment; Two arms of described U-shaped connector, through after described mounting ear, fit together described U-shaped connector and anchor head by nut.
6. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 3, is characterized in that, described vibration damping lazy halyard device further comprises the anchor slab being fixed on cable-stayed bridge body, and described anchor slab is provided with to install the bulge loop of described U-shaped connector.
7. the vibration damping lazy halyard device for cable stayed bridge as claimed in claim 1, is characterized in that, described lazy halyard is made by Nitinol, acid bronze alloy or ferrous alloy.
8. a cable stayed bridge, comprise pressure-bearing tower, hold curved beam body and the suspension cable of tension, described suspension cable is connected between described tower and beam body, it is characterized in that, described cable stayed bridge also comprises vibration damping lazy halyard device as claimed in any of claims 1 to 7 in one of claims.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110101365.XA CN102277830B (en) | 2011-04-21 | 2011-04-21 | Cable stayed bridge and vibration-reducing auxiliary cable device for same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110101365.XA CN102277830B (en) | 2011-04-21 | 2011-04-21 | Cable stayed bridge and vibration-reducing auxiliary cable device for same |
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| CN102277830A CN102277830A (en) | 2011-12-14 |
| CN102277830B true CN102277830B (en) | 2014-11-26 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102433944B (en) * | 2011-12-19 | 2014-06-18 | 北京工业大学 | Shape memory alloy damping and reinforcing device for wood structure |
| EP2636795A1 (en) * | 2012-03-08 | 2013-09-11 | The European Union, represented by the European Commission | A method for protecting taut cables from vibrations |
| CN102776837B (en) * | 2012-08-13 | 2015-08-26 | 长安大学 | A kind of suspension cable vibration insulating system based on band damping lazy halyard |
| CN103103930B (en) * | 2013-02-01 | 2016-06-08 | 北京交通大学 | Add preliminary tension drag-line after a kind of and add solid method |
| CN103362064B (en) * | 2013-07-04 | 2015-02-18 | 江苏法尔胜缆索有限公司 | Auxiliary cable net system for vibration reduction of extra-large span bridge cables |
| CN105220615B (en) * | 2015-09-15 | 2017-07-11 | 同济大学 | A kind of vibration absorber for suppressing large-span suspension bridge suspension rod wind-induced vibration |
| CN105317006B (en) * | 2015-10-30 | 2017-01-18 | 深圳大学 | Cable bearing bridge and auxiliary cable monitoring and damping system thereof |
| CN112942105B (en) * | 2021-04-23 | 2022-08-05 | 湖南大学 | Suspension bridge hoist cable damping system |
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| GB2471850A (en) * | 2009-07-14 | 2011-01-19 | Camlock Engineering Ltd | Support device for use with a vehicle or personnel |
| CN101660292A (en) * | 2009-09-25 | 2010-03-03 | 北京工业大学 | Viscous vibration-absorption auxiliary rope device for cable-stayed bridge |
| CN101672004A (en) * | 2009-09-25 | 2010-03-17 | 北京工业大学 | Shape memory alloy lazy halyard vibration damper for suspension bridge |
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