CN208415988U - A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber - Google Patents
A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber Download PDFInfo
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- CN208415988U CN208415988U CN201820692013.3U CN201820692013U CN208415988U CN 208415988 U CN208415988 U CN 208415988U CN 201820692013 U CN201820692013 U CN 201820692013U CN 208415988 U CN208415988 U CN 208415988U
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Abstract
The utility model discloses the civil structure Strengthening and Monitoring devices of a kind of piezoelectric material and the compound cloth of carbon fiber, including carbon cloth, computer terminal, data collecting card and pairs of piezoelectric material sensor, pairs of piezoelectric material sensor is fixed on carbon cloth, the carbon cloth of piezoelectric material sensor is compounded with for reinforcing civil structure, pairs of piezoelectric material sensor passes through cable respectively and is connected with the input/output port of data collecting card, and data collecting card is connected by cable with computer terminal；Computer terminal control generates driving voltage signal by data collecting card, and pass to a piezoelectric material sensor, mechanical oscillation are brought it about to transmit in the form of stress wave, stress wave is received by another piezoelectric material sensor, and is input to computer terminal after switching to digital signal by data collecting card.The present apparatus to the health status of ruggedized construction during service can monitor online for a long time, and make to safety of being on active service and effectively assessing, low in cost.
Description
Technical field
The utility model belongs to civil engineering structure field, is related to a kind of civil structure Strengthening and Monitoring technology, and in particular to
A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber.
Background technique
Civil structure mainly includes concrete structure, steel construction and composite structure, the civil engineering in natural environment
Structure since being on active service just constantly imitated by environmental attack, material aging, the long-term effect of load, fatigue effect and mutation by accumulation
The damage generated under unfavorable factors coupling should be waited, as the strength and stiffness of structure gradually decrease, leads to the safety of structure
Property, applicability and durability are severely impacted.In addition, it is many already close to or reach the engineering structure of design reference period and also compel
Reinforcing will be repaired by being essential.For such situation, carbon fibre reinforcement (Carbon Fiber Reinforced
Polymer, CFRP) because its high-strength light, corrosion resistance and durability are strong, construction is convenient, influence the advantages that small on structure in work
Journey field of reinforcement is widely adopted.
After structural strengthening, change to obtain and understand its health status and anti-seismic performance in the subsequent military service stage in time
Situation ensures the later period military service safety of entire reinforcing construction structure, the work using Intellisense sensor to structure after reinforcing
It is a kind of new technology with broad prospect of application that state and performance degradation trend, which are monitored and identify,.Piezoelectric material includes pressure
Electroceramics, piezoelectric crystal plate and piezoelectric membrane etc., with its excellent electromechanical properties and small in size, light-weight, low cost, response
Fastly, high sensitivity, easy to process, long service life the advantages that for structure partial region or key position real time on-line monitoring and
Monitoring provides new solution.But it currently, is also lacked in the prior art by monitoring structural health conditions and structural repair reinforcing
The relevant technologies of combination.
Utility model content
The purpose of this utility model is that proposing that a kind of civil engineering structure is reinforced and status monitoring complex technique, sufficiently benefit
Structural strengthening is being realized as actuator and sensor with the characteristic for the piezoelectric material being integrated on carbon fibre material
Meanwhile and piezoelectric stress guided waves propagation performance between two opposite piezoelectric materials of analysis position, monitoring identification carbon can be passed through
The defects of fiber cloth falls off, gap, and reinforce body interior hole, crackle equivalent damage.The technology can mention long-term effectively
For the status information of civil structure, provided safeguard for the long-term health military service of ruggedized construction.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the utility model is
A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber, it is characterised in that: including carbon
Fiber cloth, computer terminal, data collecting card and pairs of piezoelectric material sensor, the pairs of piezoelectric material sensor are fixed
On carbon cloth, the carbon cloth wrapped strengthening of piezoelectric material sensor is compounded on civil structure, and pairs of two
Piezoelectric material sensor be distributed in reinforce the symmetrical two sides of civil structure, pairs of piezoelectric material sensor pass through respectively cable with
The input/output port of data collecting card is connected, and data collecting card is connected by cable with computer terminal；Computer terminal control passes through
Data collecting card generates driving voltage signal, and passes to the piezoelectric material sensor as signal driver, brings it about machine
Tool vibration, mechanical oscillation signal are transmitted in the form of stress wave in civil structure, and stress wave response signal is by as receiver
Piezoelectric material sensor, which receives and passes through direct piezoelectric effect, switchs to voltage signal, and voltage signal is switched to by data collecting card later
It is input to computer terminal after digital signal, is analyzed and determined by computer terminal and reinforces civil structure health status.
As an improvement, the piezoelectric material sensor is integrated on carbon cloth by resin-bonded.
As an improvement, the piezoelectric material sensor is woven in carbon cloth, and it is adhesively fixed by epoxy resin.
As an improvement, uniformly smearing epoxy resin in piezoelectric material sensor surface, waterproof insulation process is carried out.
As an improvement, the data collecting card is NI data acquisition card, NI data acquisition card is by BNC cable respectively with two
A piezoelectric material sensor is connected, and NI data acquisition card is connected by USB cable with computer terminal.
As an improvement, the piezoelectric material sensor has multipair, multipair piezoelectric material sensor is symmetrically distributed in compacted soil
Timber structure two sides form sensor array.
As an improvement, the piezoelectric material sensor is piezoelectric ceramic piece, piezoelectric crystal plate or piezoelectric membrane.
A kind of the civil structure reinforcing and monitoring method of piezoelectric material and the compound cloth of carbon fiber, which is characterized in that including
Following steps:
Pairs of piezoelectric material sensor is fixed on carbon cloth by step 1, and in piezoelectric material sensor surface
Carry out waterproof insulation process；
The carbon cloth for being compounded with piezoelectric material sensor is laid in by binder in ruggedized construction by step 2,
Pairs of piezoelectric material sensor is located at reinforced structure sampled point two sides relative position, by two pairs of piezoelectric materials
Signal driver and signal receiver of the sensor respectively as monitoring system；
Piezoelectric material sensor is passed through cable respectively and is connected to data collecting card, then by data collecting card by step 3
It is connected with computer terminal；
Step 4, computer terminal controls data collecting card by cable and generates the driving voltage signal of certain frequency range, and leads to
It crosses data collecting card and is output to piezoelectric material sensor as signal driver, driving voltage signal drives piezoelectric material sensing
Device occur mechanical oscillation, generate piezoelectric stress wave, and inside ruggedized construction and surface propagate；Stress wave signal reinforced structure
The piezoelectric material sensor of another side surface receives and is converted into voltage signal, and the input of data collecting card is transferred to through cable
End, the voltage signal received is converted digital signal by data collecting card later, and is transferred to computer terminal；
Step 5, the stress wave response signal and its decaying that pairs of piezoelectric material sensor is transmitted by ruggedized construction
Rule is acquired for the first time, and in the case where computer terminal defines ruggedized construction health status, measured response signal is benchmark signal；
The identification feature parameter for measuring response signal by monitoring different times ruggedized construction under subsequent service state later, by computer end
End identifies knot by transmitting the identification feature parameter comparison analysis of stress wave response signal under health status with ruggedized construction
Structure damage, assesses the working condition and health status of ruggedized construction.
As an improvement, in step 5, as the piezoelectric material sensor of signal receiver under ruggedized construction health status
Reference signal takes the carbon cloth for being compounded with piezoelectric material sensor to bond the acquisition at initial stage of completing to come into operation in ruggedized construction
Signal.
As an improvement, the identification feature parameter database of typical damage is established in computer terminal, to pass through in step 5
The identification feature parameter that comparative analysis is extracted comes identification of damage position, judges type of impairment and estimation degree of injury, identifies special
Levying parameter can be worth to characterize the direct measured value of signal characteristic or deriving.
As an improvement, the identification feature parameter includes the energy magnitude for receiving signal, wavelet-packet energy value, structure office
One or any of several combines in portion's resonance frequency, signal fitting regression coefficient, factorial analysis coefficient and small echo packet node coefficient.
The utility model compared with prior art the advantages of be:
(1) existing carbon cloth can only realize the reinforcing to civil structure, without monitoring function.The utility model
Piezoelectric material sensor is compounded on carbon cloth, the function of carbon cloth has been expanded.
(2) composite material of carbon cloth and piezoelectric material sensor, it is only necessary to which reinforcing and prison can be realized in primary construction
The target of survey, operation is simple, can reduce construction cost, and prevents to cause secondary injury to civil structure.
(3) the utility model fills up the vacancy that existing civil structure is reinforced and monitors complex technique, which, which has, reinforces
The advantages of performance is good, can monitor ruggedized construction surface and internal injury online for a long time.
This method is while using carbon fibre material ruggedized construction, by sensing to two opposite piezoelectric materials of position
Friendship of the stress wave excited between device in the inside concrete of ruggedized construction and surface and ruggedized construction and carbon fiber cloth material
The propagation at interface and the judgement of attenuation characteristic, to perceive ruggedized construction in the defects of service phase and disease, including concrete
Portion crack, hole, carbon cloth and degumming, the sliding etc. for reinforcing main body.The piezoelectric material sensor passes through high-performance epoxy
Resinae adhesive glue is integrated with carbon fibre material to be merged, and manufactured novel carbon fiber cloth is laid on by reinforcing adhesive to be added
On fixing structure.The utility model to the health status of ruggedized construction during service can monitor online for a long time, to reinforcing
The military service of structure, which is made safely, timely and effectively to be assessed, low in cost.
Detailed description of the invention
Fig. 1 is the utility model civil structure Strengthening and Monitoring schematic device.
Fig. 2 is carbon fibre material cloth and piezoelectric material sensor the mounting arrangements facade on civil structure of the utility model
Schematic diagram.
Fig. 3 is carbon fibre material cloth and piezoelectric material sensor the mounting arrangements side on civil structure of the utility model
Schematic diagram.
In figure: piezoelectric material sensor of the 1- as signal driver, 2- are sensed as the piezoelectric material of signal receiver
Device, 3- carbon cloth, 4- civil structure, 5- resin impregnate glue, 6- connection driver BNC cable, 7- connection receiver BNC line
Cable, 8-NI data acquisition card, 9-USB cable, the computer terminal 10-.
Specific embodiment
Specific description is done to the embodiments of the present invention with reference to the accompanying drawing:
Piezoelectric material sensor 1 as signal driver and the piezoelectric material sensor 2 as signal receiver are in carbon
It is integrated on carbon cloth 3 during fiber cloth production by high-performance epoxy resin bonding, in two piezoelectric material sensors
1, epoxy resin is uniformly smeared on 2 surfaces, carries out waterproof insulation process；Piezoelectric material sensor selects effect best in the present embodiment
Piezoelectric ceramic piece for illustrate.
The carbon cloth 3 is impregnated by way of glue 5 is bonded in civil structure 4 resin, it is reinforced, makes institute
It states piezoelectric material sensor 1,2 and is located at 4 monitoring point two sides relative position of civil structure.
Two piezoelectric material sensors 1,2 are connected by BNC cable 6,7 with NI information acquisition card 8 respectively, NI information collection
Card 8 is connected to computer terminal 10 by USB cable 9.
Computer terminal 10 controls the sine sweep driving voltage that NI information acquisition card 8 generates certain frequency range by USB cable 9
Signal, and exported by 8 output end of NI information acquisition card, the piezoelectric material biography as signal driver is transferred to through BNC cable 6
On sensor 1, driving voltage signal drives piezoelectric material sensor 1 to generate mechanical oscillation, forms piezoelectric stress in civil structure 4
Wave, and inside civil structure and surface propagate；With that is, the piezoelectric material sensor 2 as receiver receives and passes through building knot
The stress wave response signal come is transmitted inside structure 4, and voltage signal is translated by the direct piezoelectric effect of piezoelectric material, is passed through
BNC cable 7 is transferred to 8 input terminal of NI information acquisition card, and the voltage that NI information acquisition card 8 exports piezoelectric material sensor 2 is believed
Number it is converted into digital signal, computer terminal 10 is transferred to by USB cable 9 later.
At the carbon cloth bonding and reinforcement civil structure initial stage for being compounded with piezoelectric material sensor 2, measured conduct is connect
The piezoelectric material sensor 2 for receiving device receives signal as reference signal, and identification feature parameter base is arranged in computer analysis system
Quasi- value, establishes the identification feature parameter database of typical damage, passes through the monitoring subsequent piezoresistive material during one's term of military service of civil structure later
Expect that sensor receives the difference, such as decaying, Mode variation and the delay in propagation time of signal amplitude etc. that signal generates, will know
Other characteristic parameter is compared and analyzed with identification feature parameter benchmark and typical identification feature parameter database, obtains reinforcing bar
Concrete structure internal injury situation.
The identification feature parameter that can be used for analyzing damage is more, such as amplitude, phase of signal etc..Experiments have shown that receiving
The amplitude of signal increases with the increase of the unsticking length of reinforcing bar and concrete substrate；When reinforcing bar is surrendered, wave arrive at when
Between increase, this parameter constant before reinforcement yielding；Distress in concrete damage can make the amplitude generation of signal decay, and signal
The attenuation degree of amplitude can increase with the increase of degree of injury.
Wherein, the amplitude of signal is the ideal parameter as non-destructive tests, and the amplitude of signal is the outer of signal energy
In one of performance, the variation of signal amplitude means the variation of signal energy.For example, characterizing structure by the energy value of signal
Degree of injury, it is assumed that under structural health conditions receive signal energy value EhAs benchmark, structure is in a certain damage shape
Signal energy value under state is Ei, then the relative health of the moment structure can be expressed as
Wherein, xh(n) and xi(n) structural health conditions are respectively indicated and faulted condition lower piezoelectric material sensors receive letter
Number n-th data sample point discrete signal amplitude, m is to receive the total sampling number of signal.HiValue range 0~1
Between, work as Hi=1, indicate that structure is in health status, HiIt is smaller, then show that a possibility that damaging is bigger, damages tighter
Weight, works as Hi=0, indicate that structure is in function total failure mode.
The monitoring method of the utility model can choose the pumping signal compared with multiple types and be monitored, such as impulse wave, frequency sweep
Wave etc..
It should be noted that civil structure body is often very huge in Practical Project, and the sound of piezoelectric material sensor
Range is answered to be limited compared with the outer dimension of civil structure.Therefore the utility model needs the application of large civil structure
Arrange that suitable sensor makes the effective monitoring scope of sensor network cover total, which is known as sensor
Array.What the signal intensity in array between each pair of sensor reflected is the structural damage information in its locating range, total
Damage profile situation the obtained damage index of measurement can be differentiated according to all the sensors in array.
Claims (7)
1. the civil structure Strengthening and Monitoring device of a kind of piezoelectric material and the compound cloth of carbon fiber, it is characterised in that: including carbon fiber
Wei Bu, computer terminal, data collecting card and pairs of piezoelectric material sensor, the pairs of piezoelectric material sensor are fixed on
On carbon cloth, the carbon cloth wrapped strengthening of piezoelectric material sensor is compounded on civil structure, and two pairs of pressures
Electric material sensor, which is distributed in, reinforces the symmetrical two sides of civil structure, and pairs of piezoelectric material sensor passes through cable and number respectively
It is connected according to the input/output port of capture card, data collecting card is connected by cable with computer terminal.
2. civil structure Strengthening and Monitoring device as described in claim 1, it is characterised in that: the piezoelectric material sensor passes through
It is resin-bonded to be integrated on carbon cloth.
3. civil structure Strengthening and Monitoring device as described in claim 1, it is characterised in that: the piezoelectric material sensor braiding
It is adhesively fixed in carbon cloth, and through epoxy resin.
4. civil structure Strengthening and Monitoring device as claimed in claim 2 or claim 3, it is characterised in that: in piezoelectric material sensor sheet
Epoxy resin is uniformly smeared in face, carries out waterproof insulation process.
5. civil structure Strengthening and Monitoring device as claimed in claim 2 or claim 3, it is characterised in that: the data collecting card is NI
Data acquisition card, NI data acquisition card are connected with two piezoelectric material sensors respectively by BNC cable, NI signal acquisition cartoon
USB cable is crossed to be connected with computer terminal.
6. civil structure Strengthening and Monitoring device as claimed in claim 2 or claim 3, it is characterised in that: the piezoelectric material sensor
Have it is multipair, multipair piezoelectric material sensor be symmetrically distributed in reinforce civil structure two sides, formed sensor array.
7. civil structure Strengthening and Monitoring device as described in claim 1, it is characterised in that: the piezoelectric material sensor is pressure
Electroceramics piece, piezoelectric crystal plate or piezoelectric membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820692013.3U CN208415988U (en) | 2018-05-10 | 2018-05-10 | A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820692013.3U CN208415988U (en) | 2018-05-10 | 2018-05-10 | A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber |
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| Publication Number | Publication Date |
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| CN208415988U true CN208415988U (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820692013.3U Active CN208415988U (en) | 2018-05-10 | 2018-05-10 | A kind of civil structure Strengthening and Monitoring device of piezoelectric material and the compound cloth of carbon fiber |
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| Country | Link |
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2018
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