CN101245988B - Pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing - Google Patents
Pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing Download PDFInfo
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- CN101245988B CN101245988B CN2008100641664A CN200810064166A CN101245988B CN 101245988 B CN101245988 B CN 101245988B CN 2008100641664 A CN2008100641664 A CN 2008100641664A CN 200810064166 A CN200810064166 A CN 200810064166A CN 101245988 B CN101245988 B CN 101245988B
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Abstract
The invention provides a prestress loss monitoring method that is based on full-scale optical fiber Brillouin sensing. The prestress loss monitoring method is that a layer of high-stretchability metallic foil is winded on the outer surface of an intelligent tendon of fiber reinforced resin and Brillouin distributed optical fiber sensing so as to be a packing medium, and an outer steel wire layer of a steel stranded wire with a central wire removed is evenly twisted in the same direction of the intelligent sensing tendon, thus forming an intelligent steel stranded wire of Brillouin distributed optical fiber sensing with the property of intelligent sensing. By sensing the straining of the intelligent tendon through distributed optical fiber, the prestress loss monitoring method extrapolates a stress result of the steel stranded wire and consequently monitors the prestress loss of the whole structure, and adopts an absolute optical fiber temperature compensating method for implementing temperature compensation. The prestress loss monitoring method and the technique have the advantages of full scale, good durability, easy transmission, less wear and tear, easy setting and network building, absolute measurement and strong real-time monitoring ability, etc.
Description
(1) technical field
The present invention relates to long-term structure damage monitoring field, be specifically related to a kind of construction pre-stress loss monitoring technology based on brillouin distributed optical fiber sensing.
(2) background technology
Current prestressing technique has been widely used in the every field of civil engineering work.Since the reform and opening-up, China can produce the high-strength steel goods voluntarily, has created condition for development high efficient prestress structure, has been widely applied on many (height) layer building, large span architecture, unique construction, engineering reinforcement and the fields such as bridge cable or tie-rod.The loss of prestress meeting reduces the prestress effect, reduce the cracking resistance and the rigidity of prestressed concrete member, phenomenon such as cause member to ftracture when serious, amount of deflection is excessive, anchor head is loosening, even also can the structure durability generation be had a strong impact on, potential safety hazard caused.In addition, existing loss of prestress theoretical calculation method is very imperfect, reliable and comprehensive, has very big departing from the actual monitoring situation sometimes.It is load-bearing capacity, the Crack Control of guaranteeing prestressed structure and the important means of improving the loss of prestress theoretical calculation method that loss of prestress is effectively monitored.
Mainly utilize following several force cell about the technology of loss of prestress monitoring both at home and abroad at present: strain ga(u)ge formula, differential resistance strain gage, steel chord type and magnetic flux transducer etc.But these prestress monitoring sensors mainly contain following aspect deficiency: 1) long durability and poor stability.Existing sensor protection against the tide, anticorrosion, anti-thunder and lightning, interference free performance are relatively poor, can not adapt to the rugged surroundings of open-air long-term work, have generally just lost efficacy in 2 to 3 years, can not reach the purpose of long-term monitoring structural health conditions.2) can not realize distribution measuring.In the stress loss mechanism of prestressed structure integral body, existing point type and quasi-distributed monitoring instrument can't reflect comprehensively, are mostly the point measurement that some are local.3) signal can not long-distance transmissions.The electric signal of resistance-strain type and differential resistance type sensor generally all be in the microvolt level between the millivolt level, along with the increase of transmission range, noise increases with disturbing, sensitivity significantly reduces, general service range is between several meters to tens meters.The steel chord type sensor is the a-c cycle signal, and the output voltage waveforms amplitude has distortion or decay, and is less to measurement result influence, so transmission range can be far, but also can only reach hundreds of rice.4) can not absolute measurement.The not competent long-term off-line monitoring of the sensor that need repeatedly demarcate and revise.And the distributing optical fiber sensing technology that developed recently gets up provides new thinking for this difficult problem, can remedy the deficiency of above technology.Distributing optical fiber sensing is as a kind of novel passive optical device, have protection against the tide, corrosion resistant, be easy to transmission, loss is little, be easy to lay, be easy to networking, quasi-distributed measurement and advantage such as monitoring capability is strong in real time, become one of sensitive element that is most widely used in intellectual material and the association area thereof.
Steel strand wires are the important structure parts of prestressed structure normally, depict the stress state of steel strand wires is clear, just can reflect the stress distribution and the loss of prestress result of whole prestressed structure.But, how effectively brillouin distributed optical fiber sensing (or be aided with Fiber Bragg Grating FBG in local key point) is combined with steel strand wires, and according to the loss of prestress of structural stress analysis on monitoring result, the safety problem that evaluation structure brings because of loss of prestress is the technical matters that does not still have solution at present.Though the loss of prestress that has report sampling Fiber Bragg Grating FBG to come the tested steel twisted wire, it is directly sticking obedient that but its technology is naked grating, its fatal shortcoming is the transmission line that steel strand wires reversing in loading process is easy to destroy sensor, and the permanance of its tackifier does not have basic guarantee, can't realize the long durability monitoring.In addition, the somebody is combined into intelligent reinforcing bar (fibre reinforced plastics-optical fibre grating sensing lombined sensor by fiber grating and fiber-reinforced resin, grant number: ZL 02132998.2) is directly used in steel strand wires, though can monitor the deformation information of fiber grating location point more conveniently, judge its stress level, but there are the rules such as (instantaneous loss or long-term loss), space distribution at times that can't comprehensively hold the steel strand prestress loss in this method.
(3) summary of the invention
The object of the present invention is to provide a kind ofly have full size, good endurance, be easy to transmit, loss is little, be easy to lay and the pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing of networking, absolute measurement and advantage such as monitoring capability is strong in real time.
The object of the present invention is achieved like this: the outside surface at fiber-reinforced resin-brillouin distributed optical fiber sensing intelligence muscle twines a floor height ductile metal paper tinsel, as filled media, the steel strand wires cover wire that will remove central hair evenly twists system along the same direction of intelligent sensing muscle, make brillouin distributed optical fiber sensing intelligent steel strand with intelligent sensing characteristic, strain by distribution type fiber-optic perception intelligence muscle, extrapolate the stress result of steel strand wires, thereby the loss of prestress of monitoring of structures integral body, and adopt the compensation method of optical fiber absolute temperature to carry out temperature compensation.
The present invention also comprises some technical characterictics like this:
1, describedly in FRP muscle manufacturing process, inserts the brillouin distributed optical fiber sensing composite molding;
2, the position of described brillouin distributed optical-fiber intelligent muscle in steel strand wires be for replacing the intermediate filament of steel strand wires, and its interface high ductile metal paper tinsel of sampling is filled;
3, described high ductile metal paper tinsel comprises copper, aluminium foil;
4, the length of described intelligent sensing muscle depends on the length of steel strand wires, requires the sensing muscle longer than steel strand wires, and does not have pad between the grating string wherein;
5, describedly be installed in distributing optical fiber sensing intelligent steel strand and ordinary steel twisted wire in the prestressed structure jointly, optical cable to transmission signals is protected, by the Brillouin shift change calculations construction pre-stress state of monitoring diverse location, thus assessment loss of prestress situation;
6, the described intelligent steel strand conventional intermediate plate anchor of sampling based on brillouin distributed optical-fiber intelligent muscle;
7, described pre-stress damage monitoring method based on brillouin distributed optical-fiber intelligent muscle adopts the compensation method of distributing optical fiber sensing absolute temperature to realize temperature compensation.
8, the fiber grating quantity of sensing and position require to determine according to monitoring in the described brillouin distributed intelligent sensing muscle.When the reference mark in the prestress monitored area is chosen, should take uniform principle, the centre wavelength value of sensing grating is different.
Principle of work of the present invention is as follows:
In using the prestressed structure of steel strand wires as presstressed reinforcing steel, the stress-strain state of steel strand wires can reflect the stress state of prestressed structure easily, and loss of prestress also just can accurately be known by the prestress of monitoring out prestressed structure.In steel strand wires, replace the SMIS silk of steel strand wires with distributed (or seal in fiber grating and make intelligent muscle for obtaining a partial high-precision test effect) intelligent sensing muscle, improve the bond stress of cover wire by the high ductile metal paper tinsel of filling, make cover wire and the collaborative work of distributed intelligence sensing muscle, be combined into a new intelligent steel strand.This intelligent steel strand both can be the same as with the ordinary steel twisted wire primary structure member, can utilize brillouin distributed intelligent sensing muscle as sensing element again, the stress state of monitoring steel strand wires.When making the distributed intelligence muscle, the multiplexing a plurality of distributing optical fiber sensing of connecting can be realized the quasi-distributed measurement of local message.Like this, the strain of the reading perception steel strand wires by distributing optical fiber sensing in the FRP muscle converses the stress of steel strand wires, realizes the loss of prestress monitoring to steel strand wires and prestressed structure.
The present invention also comprises distribution type fiber-optic-fibre reinforced plastics of being used for construction pre-stress loss monitoring (Fiber ReinforcedPolymer, FRP) intelligent muscle and based on the manufacture craft and the installation method of the intelligent steel strand of this intelligence muscle.The brillouin distributed optical fiber sensing intelligent steel strand comprises distributed intelligence sensing muscle, high strength steel strand, as the parts such as high ductile metal paper tinsel of filled media.Usually, we can pass through distribution type fiber-optic Brillouin sensing intelligent steel strand and structure collaborative work, realize the loss of prestress monitoring.The present invention is on the basis of the patent of invention-fibre reinforced plastics-optical fibre grating lombined sensor (grant number: ZL 02132998.2) of acquisition in 2005, brillouin distributed optical fiber sensing (local critical positions is aided with the grating string) is compound with FRP, make FRP-BOTDA (R) or FRP-(FBG)-BOTDA intelligence muscle, replace the SMIS silk of steel strand wires, make the distributing optical fiber sensing intelligent steel strand.The distributing optical fiber sensing intelligent steel strand is applied in the prestressed structure with common prestress wire, monitoring by the steel strand wires stress state realizes the monitoring to the construction pre-stress loss, and, realize whole Strain Distribution of prestressed structure and stress loss monitoring fully by the distributed nature of distributing optical fiber sensing in the intelligent muscle.This method and technology have full size, good endurance, be easy to transmission, loss is little, be easy to laying and networking, absolute measurement and advantage such as monitoring capability is strong in real time.
(4) description of drawings
Fig. 1 is a Brillouin fiber optic intelligent sensing muscle diagrammatic cross-section;
Fig. 2 is a brillouin distributed optical fiber sensing intelligent steel strand schematic cross-section;
Fig. 3 is a brillouin distributed optical fiber sensing intelligent steel strand scheme of installation.
(5) embodiment
Below in conjunction with accompanying drawing embodiments of the present invention are done concrete description:
Brillouin distributed optical-fiber intelligent sensing muscle shown in Figure 1, the position of distributing optical fiber sensing 2 should be on the central axis of FRP muscle 1.The quantity of distributing optical fiber sensing and position require to determine that the optical cable of transmission signals adopts the armouring optical cable according to structure monitoring in the intelligent sensing muscle.In conjunction with Fig. 2, the composition of brillouin distributed optical fiber sensing intelligent steel strand comprises the cover wire of distribution type fiber-optic intelligent sensing muscle 1, high strength steel strand and as the high ductile metal paper tinsel 3 of filled media.Figure 3 shows that the scheme of installation of the collaborative work of brillouin distributed optical fiber sensing intelligent steel strand 1 and ordinary steel twisted wire 2.
The present invention can adopt following method to implement:
1), according to the structure monitoring requirement, determine quantity, spacing and the Wavelength distribution of grating, make no solder joint distributing optical fiber sensing optical fiber; Then with the brillouin distributed optical fiber sensing string of appropriate length with the fiber tractive, adopt hot extrusion to make distributed intelligence sensing muscle.2), untie steel strand wires, taking-up SMIS silk, reservation cover wire.3), as shown in Figure 2, twine a floor height ductile metal paillon foil,, cover wire is evenly twisted system along the same direction of intelligent sensing muscle, make the distributing optical fiber sensing intelligent steel strand as the interface filled media at the outside surface of distributed intelligence sensing muscle.4), as shown in Figure 3, brillouin distributed optical fiber sensing intelligent steel strand and ordinary steel twisted wire are installed in the prestressed structure jointly, and the optical cable of transmission signals is protected.5) utilize the distributing optical fiber sensing (FBG) demodulator to read grating wavelength reading in the distributing optical fiber sensing intelligent steel strand, compensation obtains the stress state of structure, computation structure loss of prestress through brillouin distributed optical fiber sensing absolute temperature.The temperature compensation of brillouin distributed optical fiber sensing absolute temperature compensation is adopted and the identical encapsulating material of strain testing grating with reference to grating, and be in free state and be in identical temperature field by geodesic structure.The strain measurement grating has identical response with variation with reference to the grating pair environment temperature, and (wavelength difference) is only strained relevant with strain measurement grating institute so wavelength between the two drifts about relatively, and be irrelevant with variation of ambient temperature.When carrying out the loss of prestress monitoring based on the intelligent steel strand of distributing optical fiber sensing intelligence muscle, according to distributing optical fiber sensing wavelength change in the intelligent steel strand that records, draw the axial strain of intelligent sensing muscle, then according to the cooperative transformation of intelligent sensing muscle and cover wire, converse the strain and stress of intelligent steel strand, draw the stress state and the loss of prestress of structure.Utilize the distributing optical fiber sensing feature, can conveniently monitor the stress loss distribution plan of prestressed structure diverse location, thereby grasp the true stress distribution of structure more exactly.The short-term monitoring result can be used as the control stress for prestressing of presstressed reinforcing steel, but construction quality is estimated in the also prestressed instantaneous loss of monitoring of structures.And the long term monitoring result can obtain the long-term loss situation of construction pre-stress, structure is carried out long-term health diagnosis and safety assessment, and further improve computational analysis and design theory.
Claims (5)
1. pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing, it is characterized in that: the outside surface at fiber-reinforced resin one brillouin distributed optical fiber sensing intelligence muscle twines a floor height ductile metal paper tinsel, as filled media, the steel strand wires cover wire that will remove central hair evenly twists system along the same direction of intelligent sensing muscle, make brillouin distributed optical fiber sensing intelligent steel strand with intelligent sensing characteristic, strain by distribution type fiber-optic perception intelligence muscle, extrapolate the stress result of steel strand wires, thereby the loss of prestress of monitoring of structures integral body, and adopt the compensation method of optical fiber absolute temperature to carry out temperature compensation; The position of described brillouin distributed optical fiber sensing intelligence muscle in steel strand wires is for replacing the intermediate filament of steel strand wires, and its interface adopts high ductile metal paper tinsel to fill; The length of described intelligent sensing muscle depends on the length of steel strand wires, requires the sensing muscle longer than steel strand wires, and does not have pad between the grating string wherein.
2. the pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing according to claim 1 is characterized in that: described high ductile metal paper tinsel comprises copper, aluminium foil.
3. the pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing according to claim 1; it is characterized in that: be installed in described distributing optical fiber sensing intelligent steel strand and ordinary steel twisted wire in the prestressed structure jointly; optical cable to transmission signals is protected; by the Brillouin shift change calculations construction pre-stress state of monitoring diverse location, thus assessment loss of prestress situation.
4. the pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing according to claim 1 is characterized in that: the intelligent steel strand of the described brillouin distributed optical fiber sensing intelligence muscle conventional intermediate plate anchor of sampling.
5. the pre-stress damage monitoring method based on optical fiber Brillouin full-dimension sensing according to claim 1, it is characterized in that: the fiber grating quantity of sensing and position require to determine according to monitoring in the described brillouin distributed optical fiber sensing intelligence muscle, when the reference mark in the prestress monitored area is chosen, adopt uniform principle, the centre wavelength value of sensing grating is different.
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| CN101625230B (en) * | 2009-06-01 | 2010-10-06 | 南京大学 | Distributed optical fiber large-deformation measuring sensor |
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| CN106405762A (en) * | 2016-09-28 | 2017-02-15 | 广西大学 | Smart steel strand capable of distributable measurement |
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| CN110715610B (en) * | 2019-09-27 | 2020-12-29 | 广东聚源管业实业有限公司 | Brillouin scattering-based method and system for monitoring and early warning liquid surging in pipeline |
| CN112762851B (en) * | 2020-12-24 | 2022-12-02 | 哈尔滨工业大学 | Crack simulation calibration device based on fracture mechanics and optical fiber sensing |
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