CN110485296A - Based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method - Google Patents
Based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method Download PDFInfo
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- CN110485296A CN110485296A CN201910753648.9A CN201910753648A CN110485296A CN 110485296 A CN110485296 A CN 110485296A CN 201910753648 A CN201910753648 A CN 201910753648A CN 110485296 A CN110485296 A CN 110485296A
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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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention discloses macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method is based on, the present invention relates to Structural Engineerings and automatic control technology field.It should be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method, it is to be proposed for Orthotropic Steel Bridge Deck fatigue cracking problem by pasting the macro fibrous composite MFC with sensing with drive characteristic in Orthotropic Steel Bridge Deck, utilize the sensing characteristics and drive characteristic of MFC, apply voltage to MFC, it generates it and bridge floor panel vibration is opposite is used as power caused by external world's load action, reduces the Fatigue Vibration of Orthotropic Steel Bridge Deck.Fatigue Vibration amplitude is controlled within the set threshold range using adaptive control algorithm, guarantees that floorings will not destroy within the designed service life.Orthotropic Steel Bridge Deck fatigue proposed by the present invention based on macro fibrous composite lengthen the life control method be solve floorings fatigue cracking, extend fatigue life.
Description
Technical field
The present invention relates to Structural Engineerings and automatic control technology field, are specially based on macro fibrous composite orthotropic
Steel bridge deck Fatigue Vibration oscillation damping method.
Background technique
Orthotropic Steel Bridge Deck be by orthogonal longitudinal stiffener, lateral partitions and Steel Bridge Deck top plate welding and
At, to bear the space plate structure of wheel load, have the characteristics that it is graceful from heavy and light, short construction period, structure, it is orthogonal different
While property this molding mode of steel bridge deck makes it with good characteristic, also cause at the solder design between each component
Residual stress, weld defect and stress phenomena such as concentrating can not evade, cause very prominent fatigue problem, and fatigue
Crack detection and repair it is extremely difficult, once it is cracked, can lead to huge economic loss because suspending traffic and cause bad
Social influence, as Orthotropic Steel Bridge Deck is answered in the Longspan Bridges such as most cable-stayed bridges, suspension bridge extensively
With the even destructive insident of fatigue cracking maintenance event is also emerged in multitude in countries in the world, it has also become restrict science of bridge building development
Critical issue, seriously affect the performance and operation of bridge.
The main reason for causing Orthotropic Steel Bridge Deck often to crack in a short time is orthotropic steel bridge deck
The orthotropic inherent characteristic of plate is unevenly distributed steel facing local stiffness, and the transverse deflections of floorings will lead to U rib
Very big stress being generated with top plate commissure to concentrate, longitudinal flexure deforms the stress amplitude that can increase U rib Yu diaphragm plate commissure,
To crack initiation, then, under dynamic vehicle load repeated action, higher fatigue stress amplitude has caused the lasting extension of crackle most
Cracking eventually, is exactly a Fatigue Vibration problem, for the fatigue problem of Orthotropic Steel Bridge Deck, various countries experts and scholars in brief
It has studied for many years, and take mechanical prosthesis method, hot repairing method, carbon fiber reinforcement method and assembled method for strengthening etc. to arrange
It applies, but does not prevent the extension of fatigue crack, effect is not satisfactory, since being vibration problem, only with repairing and reinforcement and increasing
It is inadequate for adding the method for rigidity, it is desired nonetheless to the method for power and vibration damping be taken to solve.
According to Orthotropic Steel Bridge Deck local fatigue vibration characteristics, the local vibration of steel bridge deck has frequency low-amplitude
Feature and its rigidity is also constantly being degenerated with the extension of fatigue crack, this makes the natural frequency of vibration of Orthotropic Steel Bridge Deck
Have the characteristics that wideband and changes over time, meanwhile, the fatigue problem of Orthotropic Steel Bridge Deck belongs to plate shell vibration scope, top
Plate, U rib and vertical and horizontal diaphragm weld, and are difficult to add the dissipative cells such as conventional damper, Damper Braces and carry out vibration damping.
Macro fibrous composite (MFC) is novel intelligent piezo fibrous composite, mainly by piezoelectric ceramic fibers, epoxy
Resin, interdigitated electrodes are combined.Under applied voltage effect, MFC shows good piezoelectric property, the i.e. power of MFC
Learning performance can be controlled by applied voltage.MFC also has preferable flexibility, quality other than the characteristic with piezoelectric material
Gently, Hz-KHz is wide, fast response time, power output is big, is easy to paste, the advantages that durability is good, especially suitable for orthotropic steel
The Fatigue Vibration of floorings controls.Meanwhile MFC also has preferable sensing characteristics, can provide control algolithm as sensor
Required feedback signal.Therefore, it may be implemented orthogonal using MFC from the intelligence control system sense-built from drive characteristic
The local high-frequency vibration control of anisotropic steel bridge deck reduces fatigue stress amplitude, extends the tired longevity of Orthotropic Steel Bridge Deck
Life.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides based on macro fibrous composite Orthotropic Steel Bridge Deck fatigue
Oscillation damping method is vibrated, will have sensing and the MFC of drive characteristic in the excellent of the enterprising number of lines of Orthotropic Steel Bridge Deck and position
Change arrangement, using the sensing characteristics of MFC, obtain the vibration information of structure, structural information is analyzed, and combines intelligent control
Algorithm applies voltage to MFC, and the driving force for enabling it to generate offsets floorings Fatigue Vibration caused by extraneous load, thus real
Now reduce Orthotropic Steel Bridge Deck fatigue stress amplitude, extends the fatigue life of Orthotropic Steel Bridge Deck.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: orthogonal based on macro fibrous composite
Anisotropic steel bridge deck Fatigue Vibration oscillation damping method, specifically includes the following steps:
S1, MFC and displacement sensor be arranged at Orthotropic Steel Bridge Deck fatigue details first, vibration is established with this
The mathematical model of displacement and stress amplitude, and determined by the normal width limiting range of stress value of tired details using vibration displacement as feedback letter
Number control threshold；
S2, the structural vibration response signal acquired according to initial MFC, establish Orthotropic Steel Bridge Deck modal state space
The H2 norm of each rank mode is carried out descending arrangement by equation, is retained the biggish state vector of H2 norm as system and is retained mode,
According to the preferred arrangement for retaining the mode completion position on orthotropic plate MFC；
S3, MFC is solved to plate and shell structure driving equation；
S4, Fuzzy PID is write, converts modal coordinate letter for the physical space signal that MFC sensor obtains
Number, then by dSPACE real-time emulation system output control signal, voltage is amplified by high-voltage amplifier and acts on MFC, makes MFC
Power output resists structural vibration caused by extraneous load, to play the role of reducing stress amplitude.
Preferably, in the step S3 driving equation method for solving specifically includes the following steps:
T1, Orthotropic Steel Bridge Deck is set first with a thickness of H, cross section is respectively around the moment of inertia of coordinate x-axis and z-axis
Ipx、Ips, the elasticity modulus in the direction x, z is respectively Epx、Eps, MFC effective length is a, width b, with a thickness of h, the direction x, z
Elasticity modulus is respectively E1、E3, Poisson's ratio μ13、μ31, the bending radius along the direction x, z is respectively ρx、ρs；
T2, according to d- type piezoelectric equations, obtain MFC overall strain equation are as follows:
T3, MFC is pasted into body structure surface, due to MFC very thin thickness, the stress of thickness direction can be ignored, it is controlled at this time
Structure can regard plane stress problem, and calculation formula as are as follows:
T4, MFC can indicate the driving force equation of controlled structures are as follows:
It is T5, theoretical according to bending deformation it is found that the strain of controlled structures unit bending can indicate are as follows:
T6, the controlled structures bending strain obtained by bending deformation theory, can solve MFC to the driving force of controlled structures
Equation are as follows:
T7, relationship between MFC input voltage and driving force is established, and using the driving force maximum value solved as control
The upper limit of device output control force.
Preferably, in the step T6 Similarly available MFC is used as power are as follows:
Preferably, the sensing of MFC is utilized by the way that MFC is carried out preferred arrangement on orthotropic plate in the step S1
It realizes that quick vibration signal is fed back with drive characteristic, and applies voltage to MFC, caused by making its generation and extraneous load action
Bridge floor panel vibration is opposite to be used as power, and reduces the Fatigue Vibration amplitude of Orthotropic Steel Bridge Deck, thus reduce stress amplitude, with
This is realized to the Orthotropic Steel Bridge Deck fatigue life-prolonging method under the conditions of traffic zero interference.
Preferably, Orthotropic Steel Bridge Deck fatigue details is obtained by displacement sensor and MFC in the step S1 to exist
The mathematical relationship between vibration displacement and stress amplitude under extraneous load action, and according to the normal width fatigue stress of tired details
The limit determines the threshold value of vibration displacement feedback signal.
Preferably, Orthotropic Steel Bridge Deck includes girder 4, Orthotropic Steel Bridge Deck top plate 1, U rib 2 and diaphragm plate 3,
The top of the girder 4 is fixedly connected with the bottom of diaphragm plate 3, and one end of U rib 2 is run through from the side level of diaphragm plate 3
And go out, the top of the U rib 2 and diaphragm plate 3 is fixedly connected with the bottom of Orthotropic Steel Bridge Deck top plate 1.
It preferably, include MFC5, height to Orthotropic Steel Bridge Deck commissure fatigue crack control system of lengthening the life based on MFC
Press amplifier 6, computer 7, dspace real-time emulation system 8 and top plate and U rib commissure crackle 9, the high-voltage amplifier 6
Terminals pass through conducting wire respectively and connect with MFC5, computer 7 and top plate with the terminals of U rib commissure crackle 9, and calculate
The terminals of machine 7 are connect by conducting wire with the terminals of dspace real-time emulation system 8, the dspace real-time emulation system 8
Terminals connect with the connecting part of MFC5 and high-voltage amplifier 6 by conducting wire.
Preferably, the MFC5 is pasted between Orthotropic Steel Bridge Deck top plate 1 and U rib 2.
First step of the present invention is the mathematics between determining Orthotropic Steel Bridge Deck Fatigue Vibration amplitude and stress amplitude
Model needs to shake since Orthotropic Steel Bridge Deck is when carrying out active control to crack Propagation using damping technology
Dynamic response obtains control output signal as feedback input signal, can not be using the stress amplitude of local certain point as direct
Feedback signal；The preferred arrangement for followed by determining MFC number and position in Orthotropic Steel Bridge Deck, due to sensor/work
There are significant impact, and Orthotropic Steel Bridge Deck in the position of dynamic device to the energy control/controllability and vibration control effect of structure
Load case it is complicated, fatigue crack initiation position has uncertainty, and actuator/sensor preferred arrangement can be improved knot
Structure vibration control effect and control efficiency of energy utilization select mode H2 norm biodegrading process when carrying out MFC preferred arrangement,
According to the structural vibration response that the MFC sensor for being initially pasted onto body structure surface acquires, Orthotropic Steel Bridge Deck physics is sat
The equation of motion under mark system is converted into Modal Space equation, so that system transter is obtained, by each rank of ssystem transfer function
The H2 norm of mode carries out descending arrangement, retains the biggish state vector of H2 norm as system and retains mode, the method is realized
The depression of order problem of complication system has simultaneously determined the final paste position of MFC and sensor, and since MFC is to orthotropic plate
The power output size of panel directly influences the control effect of structural vibration, and therefore, demand solves MFC to plate and shell structure driving side
Journey establishes the relationship between MFC input voltage and driving force, using MFC to plate and shell structure power output maximum value as the upper of control force
Limit；Fuzzy PID is finally write, converts modal coordinate signal for the physical space signal that MFC sensor obtains, then
Control signal is exported by dSPACE real-time emulation system, voltage is amplified by high-voltage amplifier and acts on MFC, MFC is made to contribute
Structural vibration caused by extraneous load is resisted, to play the role of reducing stress amplitude.
(3) beneficial effect
The present invention provides be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method.With it is existing
Technology is following the utility model has the advantages that should be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration vibration damping side compared to having
Method by the way that MFC is carried out preferred arrangement on orthotropic plate, and applies voltage, generates it and causes with extraneous load action
Bridge floor panel vibration it is opposite be used as power, reduce the Fatigue Vibration amplitude of Orthotropic Steel Bridge Deck, to reduce stress amplitude,
This method for reducing tired details position stress amplitude is the fatigue cracking for solving Orthotropic Steel Bridge Deck, extends the tired longevity
Life has sensing with the macro fibrous composite MFC of drive characteristic by pasting in Orthotropic Steel Bridge Deck, utilizes MFC's
Sensing characteristics and drive characteristic apply voltage to MFC, generate it opposite with bridge floor panel vibration caused by extraneous load action
It is used as power, reduces the Fatigue Vibration of Orthotropic Steel Bridge Deck, while using adaptive control algorithm by Fatigue Vibration amplitude control
System within the set threshold range, guarantees that floorings will not destroy within the designed service life.
Detailed description of the invention
Fig. 1 is that the Orthotropic Steel Bridge Deck fatigue of the invention based on MFC is lengthened the life control method flow diagram；
Fig. 2 is Orthotropic Steel Bridge Deck structural schematic diagram of the invention；
Fig. 3 is used as power to Orthotropic Steel Bridge Deck slab construction for MFC of the invention and solves schematic diagram；
Fig. 4 is of the invention to be lengthened the life control schematic diagram based on MFC to Orthotropic Steel Bridge Deck commissure fatigue crack.
In figure: 1. Orthotropic Steel Bridge Deck top plates；2.U rib；3. diaphragm plate；4. girder；5.MFC；6. high-voltage amplifier；
7. computer；8.dspace real-time emulation system；9. top plate and U rib commissure crackle.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the embodiment of the present invention provides a kind of technical solution: based on macro fibrous composite orthotropic steel
Floorings Fatigue Vibration oscillation damping method, specifically includes the following steps:
S1, MFC and displacement sensor be arranged at Orthotropic Steel Bridge Deck fatigue details first, vibration is established with this
The mathematical model of displacement and stress amplitude, and determined by the normal width limiting range of stress value of tired details using vibration displacement as feedback letter
Number control threshold；
S2, the structural vibration response signal acquired according to initial MFC, establish Orthotropic Steel Bridge Deck modal state space
The H2 norm of each rank mode is carried out descending arrangement by equation, is retained the biggish state vector of H2 norm as system and is retained mode,
According to the preferred arrangement for retaining the mode completion position on orthotropic plate MFC；
S3, MFC is solved to plate and shell structure driving equation；
S4, Fuzzy PID is write, converts modal coordinate letter for the physical space signal that MFC sensor obtains
Number, then by dSPACE real-time emulation system output control signal, voltage is amplified by high-voltage amplifier and acts on MFC, makes MFC
Power output resists structural vibration caused by extraneous load, to play the role of reducing stress amplitude.
When Orthotropic Steel Bridge Deck is when receiving extraneous random vehicles load, oscillation damping method of the invention can pass through
Voltage is applied to MFC, generates it and bridge floor panel vibration is opposite caused by extraneous load action is used as power, reduction orthotropic
The Fatigue Vibration amplitude of steel bridge deck realizes to reduce stress amplitude to the orthotropic steel under the conditions of traffic zero interference
Floorings fatigue is lengthened the life.
The present invention, in step S3 driving equation method for solving specifically includes the following steps:
T1, Orthotropic Steel Bridge Deck is set first with a thickness of H, cross section is respectively around the moment of inertia of coordinate x-axis and z-axis
Ipx、Ips, the elasticity modulus in the direction x, z is respectively Epx、Eps, MFC effective length is a, width b, with a thickness of h, the direction x, z
Elasticity modulus is respectively E1、E3, Poisson's ratio μ13、μ31, the bending radius along the direction x, z is respectively ρx、ρs, coordinate system such as Fig. 3 institute
Show.
T2, according to d- type piezoelectric equations, obtain MFC overall strain equation are as follows:
T3, MFC is pasted into body structure surface, due to MFC very thin thickness, the stress of thickness direction can be ignored, it is controlled at this time
Structure can regard plane stress problem, and calculation formula as are as follows:
T4, MFC can indicate the driving force equation of controlled structures are as follows:
It is T5, theoretical according to bending deformation it is found that the strain of controlled structures unit bending can indicate are as follows:
T6, the controlled structures bending strain obtained by bending deformation theory, can solve MFC to the driving force of controlled structures
Equation are as follows:
T7, relationship between MFC input voltage and driving force is established, and using the driving force maximum value solved as control
The upper limit of device output control force.
The present invention, in step T6 Similarly available MFC is used as power are as follows:
The present invention utilizes the sensing and drive of MFC by the way that MFC is carried out preferred arrangement on orthotropic plate in step S1
Dynamic characteristic realizes quick vibration signal feedback, and applies voltage to MFC, generates it and bridge floor caused by extraneous load action
Panel vibration is opposite to be used as power, and reduces the Fatigue Vibration amplitude of Orthotropic Steel Bridge Deck, to reduce stress amplitude, with this reality
Now to the Orthotropic Steel Bridge Deck fatigue life-prolonging method under the conditions of traffic zero interference.
The present invention obtains Orthotropic Steel Bridge Deck fatigue details in the external world by displacement sensor and MFC in step S1
The mathematical relationship between vibration displacement and stress amplitude under load action, and according to the normal width fatigue stress limit of tired details
Determine the threshold value of vibration displacement feedback signal.
The present invention, Orthotropic Steel Bridge Deck include girder 4, Orthotropic Steel Bridge Deck top plate 1, U rib 2 and diaphragm plate 3,
The top of girder 4 is fixedly connected with the bottom of diaphragm plate 3, and one end of U rib 2 is run through from the side level of diaphragm plate 3,
The top of U rib 2 and diaphragm plate 3 is fixedly connected with the bottom of Orthotropic Steel Bridge Deck top plate 1.
The present invention includes MFC5, height to Orthotropic Steel Bridge Deck commissure fatigue crack control system of lengthening the life based on MFC
Amplifier 6, computer 7, dspace real-time emulation system 8 and top plate and U rib commissure crackle 9 are pressed, high-voltage amplifier 6 connects
Line end passes through conducting wire respectively and connect with MFC5, computer 7 and top plate with the terminals of U rib commissure crackle 9, and computer 7
Terminals connect with the terminals of dspace real-time emulation system 8 by conducting wire, the terminals of dspace real-time emulation system 8
It is connect by conducting wire with the connecting part of MFC5 and high-voltage amplifier 6.
The present invention, MFC5 are pasted between Orthotropic Steel Bridge Deck top plate 1 and U rib 2.
What Fig. 2 of the present invention was indicated is Orthotropic Steel Bridge Deck structural schematic diagram, and Orthotropic Steel Bridge Deck is by mutual
Vertical longitudinal stiffener, lateral partitions and Steel Bridge Deck top plate is welded, to bear the space plate structure of wheel load.
What Fig. 3 of the present invention was indicated is that MFC is used as power to Orthotropic Steel Bridge Deck slab construction and solves schematic diagram, and MFC is viscous
Patch and slab construction surface, deformation is consistent with main structure, according to bending deformation theory, can solve place MFC to slab construction
Actuation equation.
What Fig. 4 of the present invention was indicated is to lengthen the life to control signal to Orthotropic Steel Bridge Deck commissure fatigue crack based on MFC
Figure on the basis of mathematical model between vibration amplitude and stress amplitude, carries out depression of order with mode H2 norm, arranges to MFC
Quantity and position optimize, using MFC with position sensing with make dynamic characteristic and can quickly finish lengthening the life for tired details
Control.
The present invention Fig. 1 shows be that the Orthotropic Steel Bridge Deck fatigue based on MFC is lengthened the life control method flow diagram,
Orthotropic Steel Bridge Deck-MFC vibration insulating system is imitated in real time by Orthotropic Steel Bridge Deck, MFC5, displacement sensor, dspace
True system 8, high-voltage amplifier 6 and computer 7 form.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. being based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method, it is characterised in that: specifically include
Following steps:
S1, MFC and displacement sensor be arranged at Orthotropic Steel Bridge Deck fatigue details first, vibration displacement is established with this
With the mathematical model of stress amplitude, and determined by the normal width limiting range of stress value of tired details using vibration displacement as feedback signal
Control threshold；
S2, the structural vibration response signal acquired according to initial MFC, establish Orthotropic Steel Bridge Deck modal state space side
The H2 norm of each rank mode is carried out descending arrangement by journey, is retained the biggish state vector of H2 norm as system and is retained mode, according to
According to the preferred arrangement for retaining the mode completion position on orthotropic plate MFC；
S3, MFC is solved to plate and shell structure driving equation；
S4, Fuzzy PID is write, converts modal coordinate signal for the physical space signal that MFC sensor obtains, then
Control signal is exported by dSPACE real-time emulation system, voltage is amplified by high-voltage amplifier and acts on MFC, MFC is made to contribute
Resist structural vibration caused by extraneous load.
2. according to claim 1 be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method,
It is characterized by: in the step S3 driving equation method for solving specifically includes the following steps:
T1, Orthotropic Steel Bridge Deck is set first with a thickness of H, cross section is respectively I around the moment of inertia of coordinate x-axis and z-axispx、Ips,
X, the elasticity modulus in the direction z is respectively Epx、Eps, MFC effective length is a, width b, with a thickness of h, the springform in the direction x, z
Amount is respectively E1、E3, Poisson's ratio μ13、μ31, the bending radius along the direction x, z is respectively ρx、ρs；
T2, according to d- type piezoelectric equations, obtain MFC overall strain equation are as follows:
T3, MFC is pasted into body structure surface, due to MFC very thin thickness, the stress of thickness direction can be ignored, at this time controlled structures
It can regard plane stress problem, and calculation formula as are as follows:
T4, MFC can indicate the driving force equation of controlled structures are as follows:
It is T5, theoretical according to bending deformation it is found that the strain of controlled structures unit bending can indicate are as follows:
T6, the controlled structures bending strain obtained by bending deformation theory can solve MFC to the driving force equation of controlled structures
Are as follows:
T7, relationship between MFC input voltage and driving force is established, and the driving force maximum value solved is defeated as controller
The upper limit of control force out.
3. according to claim 2 be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method,
It is characterized by: in the step T6 Similarly available MFC is used as power are as follows:
4. according to claim 1 be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method,
It is characterized by: utilizing the sensing and drive of MFC by the way that MFC is carried out preferred arrangement on orthotropic plate in the step S1
Dynamic characteristic realizes quick vibration signal feedback, and applies voltage to MFC, generates it and bridge floor caused by extraneous load action
Panel vibration is opposite to be used as power.
5. according to claim 1 be based on macro fibrous composite Orthotropic Steel Bridge Deck Fatigue Vibration oscillation damping method,
It is characterized by: obtaining Orthotropic Steel Bridge Deck fatigue details in the external world by displacement sensor and MFC in the step S1
The mathematical relationship between vibration displacement and stress amplitude under load action, and according to the normal width fatigue stress limit of tired details
Determine the threshold value of vibration displacement feedback signal.
6. Orthotropic Steel Bridge Deck, it is characterised in that: including girder (4), Orthotropic Steel Bridge Deck top plate (1), U rib (2)
It is fixedly connected with the top of diaphragm plate (3), the girder (4) with the bottom of diaphragm plate (3), and one end of U rib (2) is from tabula
The side level of plate (3) runs through, the top and Orthotropic Steel Bridge Deck top plate (1) of the U rib (2) and diaphragm plate (3)
Bottom be fixedly connected.
7. being lengthened the life control system based on MFC to Orthotropic Steel Bridge Deck commissure fatigue crack, it is characterised in that: including MFC
(5), high-voltage amplifier (6), computer (7), dspace real-time emulation system (8) and top plate and U rib commissure crackle (9),
The terminals of the high-voltage amplifier (6) pass through conducting wire respectively and split with MFC (5), computer (7) and top plate and U rib commissure
The terminals of line (9) connect, and the terminals of computer (7) pass through the terminals of conducting wire and dspace real-time emulation system (8)
Connection, the terminals of the dspace real-time emulation system (8) pass through the connecting part of conducting wire and MFC (5) and high-voltage amplifier (6)
Connection.
8. according to claim 7 lengthen the life control system to Orthotropic Steel Bridge Deck commissure fatigue crack based on MFC,
It is characterized by: the MFC (5) is pasted between Orthotropic Steel Bridge Deck top plate (1) and U rib (2).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113685478A (en) * | 2021-08-25 | 2021-11-23 | 武汉理工大学 | Orthotropic steel bridge deck vibration reduction method based on leakage-proof magnetorheological damper |
| CN115162163A (en) * | 2022-08-11 | 2022-10-11 | 西南交通大学 | Full-band vibration reduction type bridge deck system and construction method thereof |
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