CN1327084C - Stayed cable shock attenuation device - Google Patents
Stayed cable shock attenuation device Download PDFInfo
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- CN1327084C CN1327084C CNB2004100099691A CN200410009969A CN1327084C CN 1327084 C CN1327084 C CN 1327084C CN B2004100099691 A CNB2004100099691 A CN B2004100099691A CN 200410009969 A CN200410009969 A CN 200410009969A CN 1327084 C CN1327084 C CN 1327084C
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- 238000013016 damping Methods 0.000 abstract description 22
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- 230000001629 suppression Effects 0.000 description 11
- 230000033001 locomotion Effects 0.000 description 3
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Abstract
The present invention relates to a cable-stayed cord vibration reduction device, which belongs to the technical field of cable-stayed cord vibration reduction. The present invention is characterized in that the present invention is a cable-stayed cord vibration reduction system composed of a connection cord, a weight, a lever, a dashpot, a support base, etc., wherein the hung weight is used for providing tension for the connection cord so that the connection cord is in a compression state, the damping force, the elastic force and the inertial force for hanging the weight, which are provided by the dashpot which is connected with a bridge deck, are transferred through the connection cord, the modal mass, the damping and the rigidity of a vibration reduction system are changed to obtain the vibration reduction purpose, and simultaneously, a movable block of a pulley block can be adjusted and substitute the lever to realize the amplification or the contraction of the damping force of the dashpot, the elastic force and the weight inertia force. The present invention has the advantages of convenient manufacture, installation and maintenance, small influence on the landscape of a cable-stayed bridge, improved vibration reduction effect, etc.
Description
Technical field
The invention belongs to the suspension cable antivibration area.
Background technology
The suspension cable of large span stayed-cable bridge is the main load-carrying member of cable stayed bridge, continuous increase along with the cable stayed bridge span, it is more and more longer that suspension cable becomes, because suspension cable is long and soft, its bending rigidity is little, natural frequency is low, general first three rank natural frequency is all below 2Hz, and modal damping is than minimum, generally about 0.001 (logarithmic decrement is below 0.007) only, drag-line very easily descends to take place excessive vibration at dynamic excitations such as wind, wind-Yu, earthquake and traffic, even vibration is significantly dispersed in generation.The vibration of suspension cable will make it be in for a long time significantly under the alternating stresses ringing, concentrate comparatively serious staying cable anchorage zone at stress, easily produce the fatigue failure of rope, serious vibration go back the entail dangers to girder construction, cause beam body crackle, the vibration of suspension cable also can make its hot extrusion high density polyethylene (HDPE) (PE) sheath and suspension cable end noose tracheal rupture, infiltration takes place and corrosion.The vibration under high-stress state of suspension cable will be accelerated the stress corrosion of rope again, and shortened the fatigue life of suspension cable greatly.The significantly vibration of suspension cable also can make pedestrian and vehicle produce discomfort and sense of insecurity, influences the normal operation of bridge.Therefore the vibration of controlling oblique suspension cable is very important.
The vibration mechanism of suspension cable is very complicated, and known up to now oscillatory type has: (1) vortex-induced vibration, and (2) wake flow galloping, (3) wind-Yu exciting, buffet (4), (5) air force unstability, (6) parametric vibration, (7) rope internal resonance etc.But existing result of study shows, as long as take measures to improve the damping of suspension cable, makes suspension cable free vibration logarithmic decrement improve the various vibrations that can suppress above-mentioned suspension cable more than 0.05.
At present, the device of the damping of the raising suspension cable of generally acknowledging mainly is (as patent 99253182.9 with various shock absorbers such as rubber cushion assembly, the suspension cable vibration absorber), oil damper is (as patent 97241962.4 patent name:, patent name: the cable-stayed bridge cable hydraulic buffer), the sticky shearing damper (as patent 98232486.3, the inhaul cable vibration damper), MR damper etc. realizes being rigidly connected of shock absorber and suspension cable and bridge floor by the bigger member of rigidity patent name:.Because the effectiveness in vibration suppression of shock absorber is directly related with the installation site of shock absorber on suspension cable, in theory, be L to the distance of drag-line root as if the damper installation site
d, the suspension cable length overall is L, then shock absorber additional damping and L that suspension cable is provided
d/ L is directly proportional.Usually to reach desirable effectiveness in vibration suppression, require L
d/ L is about 3%.And in order not influence the attractive in appearance of bridge, the designer requires the setting height(from bottom) of shock absorber not exceed bridge railing height (about 1.5 meters) usually, and the cable stayed bridge bigger to span, reach satisfied effectiveness in vibration suppression, the height that shock absorber goes out bridge floor can reach 2～3 meters, higher sometimes, and the shock absorber installation site is high more, for guaranteeing coupling stiffness, and unlikely unstability (because of connecting elements tension, pressurized sometimes sometimes), the size of connecting elements will be big more, this not only makes the manufacturing cost of shock absorber connecting elements increase, and can cause very adverse influence to the view of cable stayed bridge.In addition, because the inclination angle of cable stayed bridge diverse location suspension cable has nothing in common with each other, for guaranteeing the damper vibration damping effect, damper should be vertical with suspension cable, angle between diverse location connecting elements and the bridge floor also has nothing in common with each other like this, thereby the design of the damping device of existing suspension cable vibration absorber, manufacturing and installation difficulty are all bigger.
Summary of the invention
The object of the present invention is to provide a kind of new vibration absorber, it can overcome the deficiency of existing suspension cable vibration absorber, not only makes the suspension cable damper little to the landscape impact of cable stayed bridge, and makes things convenient for the manufacturing and the installation of suspension cable damper, suspension cable vibration damping cost is reduced, and improve effectiveness in vibration suppression.
For achieving the above object, the technology used in the present invention thinking is: form suspension cable vibration insulating system (seeing Fig. 1,2) by connecting strand, weight, lever or assembly pulley, damper bearing etc.The weight of suspention provides tension force for connecting strand, make it be in tension state, and be connected in the damping force that damper provided, elastic force of bridge floor and hang the inertia force of weight by this connecting strand transmission, change modal mass, damping and the rigidity of vibrational system, reach the purpose of vibration damping.Concrete technical scheme is: adopt connecting strand (or connecting rod), the one end links to each other with cord clip on being connected in suspension cable, the other end with the band weight lever or assembly pulley or directly link to each other with a weight, turn to fixed pulley in the middle of the connecting strand, thereby make its two ends vertical with suspension cable respectively with lever (or bridge floor).Between lever and the bridge floor or between weight and the bridge floor damper being installed, can be passive-type dampers such as oil damper, sticky shearing damper, to realize the Passive Control of Inclined Cable Vibration; Also can adopt half ACTIVE CONTROL that realizes Inclined Cable Vibration as half active dampers such as MR damper, variable friction dampers; Even can adopt the ACTIVE CONTROL that realizes Inclined Cable Vibration as active damper such as piezo-electric damping device, magnetostriction damper.Connecting strand always is in tension state, thereby can adopt flexible rope, can be connected with suspension cable is vertical at any angle easily, thereby make design, manufacturing, the installation of the vibration absorber agent structure of diverse location suspension cable on the bridge reach standardization.The diameter that theory analysis shows connecting strand only for 1/10～1/8 of suspension cable diameter, promptly not only can reach the power transmission purpose but also do not influence effectiveness in vibration suppression, even thereby the position that connects cord clip exceed railing, also unlikely whole view to cable stayed bridge causes too much influence; The main effect of weight is that connecting strand (or connecting rod) is applied pretension, makes it be in tension state all the time, simultaneously owing to can improve the modal mass of vibrational system, thereby also can reach the purpose that improves effectiveness in vibration suppression; Lever or assembly pulley can be selected as required, to change the stroke of damper maximum output or damper, thereby can make the effectiveness in vibration suppression of vibration insulating system reach optimum state easily by regulating amplification (or dwindling) multiple of damper damping force, elastic force and weight inertia force.Because the damper installation site is transferred near bridge floor, not resembling common suspension cable shock absorber is a high position that approaches cord clip, and the maintenance of vibration absorber of the present invention is also convenient.
The invention is characterized in:
Flexibly connect rope, the one end links to each other with cord clip on being contained in suspension cable;
The lever of band weight, it links to each other with the other end of above-mentioned connecting strand;
Bearing, it is by being bolted on the girder, and it links to each other with the other end of above-mentioned lever by bearing pin again;
Fixed pulley, it is installed on the bearing, and this fixed pulley rolls with the middle part of above-mentioned connecting strand and contacts, and makes the connecting strand two ends respectively
Vertical with above-mentioned suspension cable with above-mentioned lever;
Damper, it is installed between above-mentioned lever and the girder end face or is installed between above-mentioned weight and the girder end face.
Feature of the present invention also is:
Flexibly connect rope, the one end links to each other with cord clip on being contained in suspension cable;
Regulate the assembly pulley movable pulley, it links to each other with the other end of above-mentioned connecting strand by the bearing pin on the center;
Weight, its top links to each other with a rope, and this rope is walked around and is regulated the end face that is fixed to girder behind the assembly pulley;
Bearing, it is by being bolted on the girder;
Fixed pulley, it is installed on the bearing, and this fixed pulley rolls with the middle part of above-mentioned connecting strand and contacts, and makes the connecting strand two ends vertical with bridge floor with above-mentioned suspension cable respectively;
Damper, it is installed between above-mentioned weight and the girder end face.
The present invention has the following advantages:
1, reduces of the influence of suspension cable vibration absorber to the cable stayed bridge view;
2, be convenient to the manufacturing of suspension cable vibration absorber, installation and maintenance, can reduce the cost of suspension cable vibration absorber;
3, by regulating amplification (or dwindling) multiple of damper damping force, elastic force and weight inertia force, can make the effectiveness in vibration suppression of vibration insulating system reach optimum state more conveniently, except that damper provides damping, also utilize weight inertia to improve the structural modal quality, improve the effectiveness in vibration suppression of vibration absorber.
Description of drawings
Fig. 1 and Fig. 2 are the structural representation of suspension cable vibration absorber of the present invention.The present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the present invention when adopting the lever amplification system.
Fig. 2 is the structural representation of the present invention when adopting the assembly pulley amplification system.
1. suspension cables among Fig. 1,2. cable-stayed bridge main-beam, 3. cord clip, 4. connecting strand, 5. angle pulley pair, 6. bearing, 7. adjustment (adjusting) lever bearing pin, 8. lever, 9. weight, 10. damper, 11. bearing connecting bolts, h. rail height.
1. suspension cables among Fig. 2,2. cable-stayed bridge main-beam, 3. cord clip, 4. connecting strand, 5. angle pulley pair, 6. bearing, 12. regulate the assembly pulley ropes, and 13. regulate the assembly pulley movable pulley, 9. weight, 10. damper, 11. bearing connecting bolts, h. rail height.
The specific embodiment
In Fig. 1, one end of connecting strand 4 links to each other with cord clip 3 on being connected in suspension cable 1, the other end links to each other with the lever 8 of band weight 9, turns to a fixed pulley 5 that is installed on the bearing 6 in the middle of the connecting strand 4, thereby makes connecting strand 4 two ends vertical with the end face of girder 2 with suspension cable 1 respectively.Lever 8 is connected on the bearing 6 by bearing pin 7.Damper 10 is installed between lever 8 and girder 2, damper 10, can be that passive-type dampers such as oil damper or sticky shearing damper are to realize the Passive Control of Inclined Cable Vibration, also can adopt half ACTIVE CONTROL that realizes Inclined Cable Vibration as half active dampers such as MR damper, variable friction dampers, even can adopt the ACTIVE CONTROL that realizes Inclined Cable Vibration as active damper such as piezo-electric damping device, magnetostriction damper.Bearing 6 is affixed by connecting bolt 11 and bridge floor.During suspension cable 1 vibration, connecting strand 4 reaches lever with the motion at suspension cable cord clip place, causes that weight 9 motions produce inertia force, simultaneously because the component movement of damper 10 produces damping force, thereby suppress the vibration of suspension cable 1.Because weight 9 applies pretension by 8 pairs of connecting strands 4 of lever, make it be in tension state all the time, thereby can adopt diameter only to be the gentle rope of suspension cable diameter 1/10～1/8, after turning to by angle pulley pair 5, easily with 1 vertical connection of suspension cable at any angle, make the design of the vibration absorber agent structure of diverse location suspension cable on the cable stayed bridge, make, installation reaches standardization, reduce the overall cost of pulling cable damping, simultaneously because connecting strand 4 is very thin, even it is a lot of that the position of connection cord clip 3 exceeds railing, also unlikely whole view to cable stayed bridge causes too much influence; Weight 9 removes and applies pretension by 8 pairs of connecting strands 4 of lever, and it is in outside the tension all the time, also can improve the modal mass of vibrational system because of its motional inertia, improves effectiveness in vibration suppression; Lever 8 can be selected the stroke that reduces the damper maximum output or reduce damper as required, thereby, make the effectiveness in vibration suppression of vibration insulating system reach optimum state easily by regulating amplification (or dwindling) multiple of damper 10 damping forces, elastic force and weight 9 inertia force.
Implement device and Fig. 1 of Fig. 2 are similar, and difference is to use among Fig. 2 regulates the lever 8 that assembly pulley movable pulley 13 replaces among Fig. 1, realizes the damping force of damper 10 and the inertia force of weight 9 are amplified (or dwindling).
Claims (4)
1. suspension cable vibration absorber is characterized in that it contains:
Flexibly connect rope, the one end links to each other with cord clip on being contained in suspension cable;
The lever of one end band weight, it links to each other with the other end of above-mentioned connecting strand;
Bearing, it is by being bolted on the girder, and it links to each other by the other end of bearing pin with the lever of above-mentioned band weight again;
Fixed pulley, it is installed on the bearing, and this fixed pulley rolls with the middle part of above-mentioned connecting strand and contacts, and makes the connecting strand two ends vertical with the lever of above-mentioned band weight with above-mentioned suspension cable respectively;
Damper, it is installed between the lever and girder end face of above-mentioned band weight.
2. suspension cable vibration absorber is characterized in that it contains:
Flexibly connect rope, the one end links to each other with cord clip on being contained in suspension cable;
Regulate the assembly pulley movable pulley, it links to each other with the other end of above-mentioned connecting strand by the bearing pin on the center;
Weight, its top links to each other with a rope, and this rope is walked around and is regulated the end face that is fixed to girder behind the assembly pulley;
Bearing, it is by being bolted on the girder;
Fixed pulley, it is installed on the bearing, and this fixed pulley rolls with the middle part of above-mentioned connecting strand and contacts, and makes the connecting strand two ends vertical with bridge floor with above-mentioned suspension cable respectively;
Damper, it is installed between above-mentioned weight and the main top of beam.
3. suspension cable vibration absorber according to claim 1 is characterized in that: damper is installed between above-mentioned weight and the girder end face.
4. suspension cable vibration absorber according to claim 1 and 2 is characterized in that: the diameter of described connecting strand is 1/10～1/8 of a suspension cable diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100099691A CN1327084C (en) | 2004-12-07 | 2004-12-07 | Stayed cable shock attenuation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100099691A CN1327084C (en) | 2004-12-07 | 2004-12-07 | Stayed cable shock attenuation device |
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| Publication Number | Publication Date |
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| CN1651656A CN1651656A (en) | 2005-08-10 |
| CN1327084C true CN1327084C (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100099691A Active CN1327084C (en) | 2004-12-07 | 2004-12-07 | Stayed cable shock attenuation device |
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| CN (1) | CN1327084C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561184A (en) * | 2011-12-30 | 2012-07-11 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
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| JPH08302617A (en) * | 1995-05-01 | 1996-11-19 | Nakai Shoko Kk | Cable vibration control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561184A (en) * | 2011-12-30 | 2012-07-11 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
| CN102561184B (en) * | 2011-12-30 | 2014-10-29 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Vertical shock absorption device with external stayed cable |
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| CN1651656A (en) | 2005-08-10 |
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Owner name: CHINA S RAILROAD BRIDGE BUREAU GROUP CO.LTD;WUHAN Free format text: FORMER OWNER: TSINGHUA UNIVERSITY Effective date: 20120606 |
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Address after: 103 No. 430000 Hubei Province in Qiaokou District of Wuhan city road construction Patentee after: BRIDGE SCIENCE AND TECHNOLOGY INSTITUTE CO., LTD., CHINA RAILWAY ENGINEERING GROUP Address before: 430034 Wuhan construction Avenue, Hubei, No. 103 Patentee before: China Zhongtie Major Bridge Engineering Group Co., Ltd. |