CN107884771A - A kind of new method of ground-based radar inverting load carrying capacity of bridge - Google Patents

A kind of new method of ground-based radar inverting load carrying capacity of bridge Download PDF

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Publication number
CN107884771A
CN107884771A CN201810034283.XA CN201810034283A CN107884771A CN 107884771 A CN107884771 A CN 107884771A CN 201810034283 A CN201810034283 A CN 201810034283A CN 107884771 A CN107884771 A CN 107884771A
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bridge
formula
ground
based radar
displacement
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龙四春
童爱霞
马金玉
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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Priority to CN201810034283.XA priority Critical patent/CN107884771A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention provides a kind of new method of ground-based radar inverting load carrying capacity of bridge.Step is as follows：Bridge is scanned using ground-based radar, the strained situation of joint CW with frequency modulation and interferometry technology detection bridge arbitrfary point position at any time, draw displacement time series figure, displacement time series spectrogram, amplitude spectrum figure, time domain amount of deflection aspect graph, the frequency domain amount of deflection aspect graph of bridge monitoring point position.Bridge actual bearer ability when being tested further according to ground-based radar data inversion static load, and when dynamic load is tested bridge structure self power performance and dynamic response rule, provide theoretical foundation for bridge bearing is safe.The present invention need not dispose Other Instruments to obtain the bearer capability information under any scan position of bridge, different operating modes with 0.01mm precision on bridge（Including the natural frequency of vibration, amount of deflection etc.）, it is non-contact measurement.The present invention can carry out bridge static measurement and can and realize dynamic monitoring, can monitor the vibration frequency that bridge is up to 4000Hz, it also avoid the data distortion that the data conversion in traditional monitoring between a variety of instruments is brought.

Description

A kind of new method of ground-based radar inverting load carrying capacity of bridge
Technical field
The present invention relates to a kind of new method of ground-based radar inverting load carrying capacity of bridge, particularly measures bridge in ground-based radar A kind of new method that beam vibration, quiet dynamic load state and amount of deflection change, bearing capacity inverting etc. propose.
Background technology
According to China《Urban Bridge detects and assessment technology specification》Regulation, bridge machinery are divided into bridge structure inspection with evaluation Survey includes two aspects of dead load test and dynamical load test again with Bearing Capacity Evaluation two parts, Bearing Capacity Evaluation. Bridge circle, which carries out the method that deformation monitoring mainly uses, at present has method of tension wire alignment with instrument, connects tube method, video survey as method, work light Learn mensuration, accelerograph, deformeter, total powerstation, laser interferometer etc..The foundation settlement of bridge can use these routine sides Method measures, but the dynamic deformation of bridge or amount of deflection deformation using traditional measuring instrument be difficult to reach preferable effect and Efficiency is low, and static measurement and can be carried out by, which rarely having in these instruments, realizes dynamic measurement.Traditional monitoring means generally obtains What is taken is point-like information, and information content is few, and measures a large amount of manpower and materials of needs.
Light deformation monitors the performance that radar shows brilliance in the Light deformation monitoring of large bridge etc., can obtain bridge Ess-strain information under any position, different operating modes（Such as natural frequency of vibration, amount of deflection）, and need not be disposed on bridge other Instrument can be with the amount of deflection of 0.01mm accuracy monitoring bridge, while can monitor the vibration frequency that bridge is up to 4000Hz, its Range is monitored up to several kilometers.Ground-based radar technology, which can carry out static measurement, can also realize dynamic detection.
The content of the invention
In order to effectively solve the quiet dynamic load of existing highway bridge into bridge experiment and bridge dynamic monitoring high-precision quick response, the present invention A kind of new method that bridge ess-strain is measured using ground-based radar is provided.The present invention can improve existing highway bridge ess-strain amount of deflection Deng precision and efficiency of detecting, manpower and materials cost is reduced, is measured convenient and simple quick, you can carry out static loading experiment, can also meet Dynamic load detects, and need not dispose during measurement Other Instruments can be with the amount of deflection of 0.01mm accuracy monitoring bridge, simultaneously on bridge The vibration frequency that bridge is up to 4000Hz can be monitored.
In order to solve the above technical problems, scheme of the present invention：A kind of ground-based radar inverting load carrying capacity of bridge New method, comprise the following steps：
1）In bridge positioned beneath ground-based radar, monitoring is scanned to bridge using ground-based radar, combines CW with frequency modulation （FMCW）Technology and the strained situation of interferometry technology measurement bridge any time arbitrfary point position in monitored area, draw bridge Liang Sicheng time series chart, displacement time series spectrogram, amplitude spectrum figure, time domain amount of deflection aspect graph, frequency domain amount of deflection aspect graph；
Wherein linear frequency modulation continuous wave is expressed as：
（1）
In formula,For linear frequency modulation rate,For signal carrier frequency,For rectangular window function, whereinIt is wide for pulse Degree, pulse-recurrence time is。
Ground-based radar improves range resolution using linear frequency modulation continuous wave technology, utilizes transmission signal and echo-signal Between difference on the frequency determine target range, ground-based radar transmitting antenna launch a centre frequency be, frequency modulation letter with a width of B Number, the centre wavelength of the signal is by formula（2）Export：
（2）
Ground-based radar continuously receives the echo from the direction by reception antenna, and part energy is drawn out of emitter Continuously it is mixed as local oscillation signal with echo-signal, Beat Signal is obtained with this, by enters line frequency to Beat Signal Spectrum analysis, may separate out the echo-signal of the object at different distance；
The interferometry technology refers to ground-based radar by measuring objective body in the phase difference in Electromagnetic Wave Propagation direction to obtain Change in displacement dr：
（3）
In formula, λ is wavelength,For interferometry phase（Interferometric phase）.
2）Bridge is actual during the change in displacement data inversion static load experiment monitored according to ground-based radar in step 1 holds Loading capability；
Static test load effciencyUse formula（4）To express：
（4）
In formula：--- under static test load action, the max calculation effect of corresponding Loading Control force on cross-section or displacement Value；
S --- same Loading Control force on cross-section caused by control load or the least favorable calculation of effect value of displacement；
μ --- the impact coefficient value taken by specification.
To final acceptance of construction loading test,Preferably between 0.85-1.05；Loading test during operation,Preferably between Between 0.95-1.05.
Formula is pressed in measuring point displacement strain（5）-（7）Calculate.
（5）
（6）
（7）
In formula：--- the structure total displacement of the lower measurement of finder charge effect（Or overall strain）Value；
--- the structural elasticity displacement of the lower measurement of finder charge effect（Or strain）Value；
--- the structure residual displacement of the lower measurement of finder charge effect（Or strain）Value；
--- the measured value before loading；
--- measured value when loading reaches stable；
--- measured value when reaching stable after unloading.
The relative residual displacement of measuring point（Or strain）By formula（8）Calculate：
（8）
The checkout coefficient of measuring point presses formula（9）Resolve：
ƞ=（9）
3）The change in displacement data inversion dynamic load monitored according to ground-based radar in step 1 tests itself of lower bridge structure The dynamic response rule of power performance and the lower structure of carload effect.
Accessible road performance test load effciencyBy formula（10）Calculate,High level is preferably taken, but is not to be exceeded 1.
（10）
In formula：--- the maximum internal force of controlling sections or deformation under dynamic test load action；
--- the maximum internal force of the lower controlling sections of control load effect or deformation（Disregard impact）.
Impact coefficientBy formula（11）Calculate：
（11）
In formula：--- maximum dynamic deflection amplitude；
--- the vertex value of amplitude of wave form centrode is removed, or is asked for by LPF；
--- withCorresponding dynamic deflection valley value；
--- peak-peak value of amount of deflection dynamic component.
Damping parameter presses formula using Waveform Analysis Method（12）Calculate：:
（12）
In formula：D --- damping ratio；
N --- the number of ripple calculated is participated in, not less than 3；
--- participate in the Mintrop wave peak value calculated；
--- participate in the Mintrop wave valley value calculated；
--- participate in the microwave peak calculated；
--- participate in the coda wave valley value calculated.
The technique effect of the present invention：
1）The present invention can obtain ess-strain and amount of deflection information of the bridge under any position, different operating modes, solve tradition prison Survey means need to lay the problem of monitoring site, contact measurement and information content are few；Avoid in traditional monitoring between a variety of instruments Data conversion and the data distortion that brings.
2）The present invention can carry out bridge static loading experiment, can also meet bridge operation dynamic load detection, and manpower needed for measurement Material resources are few, high without contact measurement, degree of safety.
3）Present invention experiment sampling time interval is short, can reach 1ns, sampling precision can reach 0.01mm, can monitor bridge Up to 4000Hz vibration frequency, and be measured as non-contact measurement, without laying measurement point position on bridge, at Monitoring Data Reason automation.
Brief description of the drawings
Fig. 1 is the specific implementation flow chart of the present invention.
Embodiment
A kind of method of ground-based radar inverting load carrying capacity of bridge, comprises the following steps：
1）In bridge positioned beneath ground-based radar, the height and the elevation angle of radar transmitter are recorded, between radar transmitter and bridge Distance；Set up camera, registration of vehicle or train passage time respectively at bridge both ends；
2）Monitoring is scanned to bridge using ground-based radar, combines CW with frequency modulation（FMCW）Technology is surveyed with interferometry technology Measure the strained situation of bridge any time arbitrfary point position in monitored area；
Wherein linear frequency modulation continuous wave is expressed as：
（1）
In formula,For linear frequency modulation rate,For signal carrier frequency,For rectangular window function, whereinIt is wide for pulse Degree.
Ground-based radar improves range resolution using linear frequency modulation continuous wave technology.Utilize transmission signal and echo-signal Between difference on the frequency determine target range.One centre frequency of ground-based radar antenna transmitting is, the FM signal with a width of B, The centre wavelength of signal is by formula（2）Export：
（2）
Echo from the direction is continuously received by another antenna, and part energy is drawn as local oscillator out of emitter Signal and be continuously mixed with echo-signal, Beat Signal is obtained with this, by Beat Signal carry out spectrum analysis, can Separate the echo-signal of the object from different distance.
The interferometry technology refer to ground-based radar by measure objective body Electromagnetic Wave Propagation direction phase difference and Obtain change in displacement dr：
（3）
In formula, λ is wavelength,For interferometry phase（Interferometric phase）.
3）Analysis draws bridge displacement time series chart, displacement time series spectrogram, amplitude spectrum figure, time domain amount of deflection form Figure, frequency domain amount of deflection aspect graph.
4）Bridge actual bearer energy when the change in displacement data inversion static load monitored according to step 2 radar is tested Power；
Static test load effciencyUse formula（4）To express：
（4）
In formula：--- under static test load action, the max calculation effect of corresponding Loading Control force on cross-section or displacement Value；
S --- same Loading Control force on cross-section caused by control load or the least favorable calculation of effect value of displacement；
μ --- the impact coefficient value taken by specification.
To final acceptance of construction loading test,Preferably between 0.85-1.05；Loading test during operation,Preferably between Between 0.95-1.05.
Formula is pressed in measuring point displacement strain（5）-（7）Calculate.
（5）
（6）
（7）
In formula：--- the structure total displacement of the lower measurement of finder charge effect（Or overall strain）Value；
--- the structural elasticity displacement of the lower measurement of finder charge effect（Or strain）Value；
--- the structure residual displacement of the lower measurement of finder charge effect（Or strain）Value；
--- the measured value before loading；
--- measured value when loading reaches stable；
--- measured value when reaching stable after unloading.
The relative residual displacement of measuring point（Or strain）By formula（8）Calculate：
（8）
The checkout coefficient of measuring point presses formula（9）Resolve：
ƞ=（9）
3）The self power of the lower bridge structure of change in displacement data inversion dynamic load experiment monitored according to step 2 radar The dynamic response rule of lower structure can be acted on carload.
Accessible road performance test load effciencyCan be by formula（10）Calculate,High level is preferably taken, but is not to be exceeded 1.
（10）
In formula：--- the maximum internal force of controlling sections or deformation under dynamic test load action；
--- the maximum internal force of the lower controlling sections of control load effect or deformation（Disregard impact）.
Impact coefficientBy formula（11）Calculate：
（11）
In formula：--- maximum dynamic deflection amplitude；
--- the vertex value of amplitude of wave form centrode is removed, or is asked for by LPF；
--- withCorresponding dynamic deflection valley value；
--- peak-peak value of amount of deflection dynamic component.
Damping parameter can press formula using Waveform Analysis Method（12）Calculate：:
（12）
In formula：D --- damping ratio；
N --- the number of ripple calculated is participated in, not less than 3；
--- participate in the Mintrop wave peak value calculated；
--- participate in the Mintrop wave valley value calculated；
--- participate in the microwave peak calculated；
--- participate in the coda wave valley value calculated.

Claims (1)

  1. A kind of 1. new method of ground-based radar inverting load carrying capacity of bridge, it is characterized in that comprising the following steps：
    1）In bridge positioned beneath ground-based radar, monitoring is scanned to bridge using ground-based radar, combines CW with frequency modulation （FMCW）Technology and the strained situation of interferometry technology measurement bridge any time arbitrfary point position in monitored area, draw bridge Liang Sicheng time series chart, displacement time series spectrogram, amplitude spectrum figure, time domain amount of deflection aspect graph, frequency domain amount of deflection aspect graph；
    Wherein linear frequency modulation continuous wave is expressed as：
    （1）
    In formula,For linear frequency modulation rate,For signal carrier frequency,For rectangular window function, whereinIt is wide for pulse Degree, pulse-recurrence time is；
    Ground-based radar improves range resolution using linear frequency modulation continuous wave technology, using between transmission signal and echo-signal Difference on the frequency determine target range, ground-based radar transmitting antenna launch a centre frequency be, the FM signal with a width of B, The centre wavelength of the signal is by formula（2）Export：
    （2）
    Ground-based radar continuously receives the echo from the direction by reception antenna, and part energy is drawn out of emitter Continuously it is mixed as local oscillation signal with echo-signal, Beat Signal is obtained with this, by enters line frequency to Beat Signal Spectrum analysis, may separate out the echo-signal of the object at different distance；
    The interferometry technology refers to ground-based radar by measuring objective body in the phase difference in Electromagnetic Wave Propagation direction to obtain Change in displacement dr：
    （3）
    In formula, λ is wavelength,For interferometry phase（Interferometric phase）；
    2）Bridge actual bearer energy when the change in displacement data inversion static load monitored according to ground-based radar in step 1 is tested Power；
    Static test load effciencyUse formula（4）To express：
    （4）
    In formula：--- under static test load action, the max calculation effect of corresponding Loading Control force on cross-section or displacement Value；
    S --- same Loading Control force on cross-section caused by control load or the least favorable calculation of effect value of displacement；
    μ --- the impact coefficient value taken by specification；
    To final acceptance of construction loading test,Preferably between 0.85-1.05；Loading test during operation,Preferably between 0.95- Between 1.05；
    Formula is pressed in measuring point displacement strain（5）-（7）Calculate；
    （5）
    （6）
    （7）
    In formula：--- the structure total displacement of the lower measurement of finder charge effect（Or overall strain）Value；
    --- the structural elasticity displacement of the lower measurement of finder charge effect（Or strain）Value；
    --- the structure residual displacement of the lower measurement of finder charge effect（Or strain）Value；
    --- the measured value before loading；
    --- measured value when loading reaches stable；
    --- measured value when reaching stable after unloading；
    The relative residual displacement of measuring point（Or strain）By formula（8）Calculate：
    （8）
    The checkout coefficient of measuring point presses formula（9）Resolve：
    ƞ=（9）
    3）The change in displacement data inversion dynamic load monitored according to ground-based radar in step 1 tests itself of lower bridge structure The dynamic response rule of power performance and the lower structure of carload effect；
    Accessible road performance test load effciencyBy formula（10）Calculate,High level is preferably taken, but is not to be exceeded 1；
    （10）
    In formula：--- the maximum internal force of controlling sections or deformation under dynamic test load action；
    --- the maximum internal force of the lower controlling sections of control load effect or deformation（Disregard impact）；
    Impact coefficientBy formula（11）Calculate：
    （11）
    In formula：--- maximum dynamic deflection amplitude；
    --- the vertex value of amplitude of wave form centrode is removed, or is asked for by LPF；
    --- withCorresponding dynamic deflection valley value；
    --- peak-peak value of amount of deflection dynamic component；
    Damping parameter presses formula using Waveform Analysis Method（12）Calculate：:
    （12）
    In formula：D --- damping ratio；
    N --- the number of ripple calculated is participated in, not less than 3；
    --- participate in the Mintrop wave peak value calculated；
    --- participate in the Mintrop wave valley value calculated；
    --- participate in the microwave peak calculated；
    --- participate in the coda wave valley value calculated.
CN201810034283.XA 2018-01-15 2018-01-15 A kind of new method of ground-based radar inverting load carrying capacity of bridge Pending CN107884771A (en)

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Cited By (9)

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CN108914815A (en) * 2018-05-17 2018-11-30 中铁大桥科学研究院有限公司 Bridge floor vehicular load identification device, bridge and bridge load are distributed recognition methods
CN111060160A (en) * 2020-01-03 2020-04-24 防灾科技学院 GB-SAR-based high-speed rail simply-supported box girder operation performance parameter testing method
CN112034454A (en) * 2020-08-03 2020-12-04 北京理工大学 Bridge self-vibration mode obtaining method based on MIMO radar
CN113419222A (en) * 2021-05-10 2021-09-21 北方工业大学 Method and system for extracting bridge vibration frequency based on radar signals
CN115060208A (en) * 2022-06-30 2022-09-16 国网山东省电力公司电力科学研究院 Power transmission and transformation line geological disaster monitoring method and system based on multi-source satellite fusion
CN116499671A (en) * 2023-06-27 2023-07-28 南京隼眼电子科技有限公司 Bridge deflection monitoring method and device based on millimeter wave radar and storage medium
CN116819516A (en) * 2023-03-29 2023-09-29 中国科学院国家空间科学中心 High-speed railway bridge vibration monitoring radar system
CN116973877A (en) * 2023-09-22 2023-10-31 南京楚航科技有限公司 Millimeter wave radar deformation measurement method, system and measurement truth value calibration method
CN118465731A (en) * 2024-07-15 2024-08-09 苏交科集团股份有限公司 Bridge multi-point displacement influence line synchronous identification method, system and storage medium based on foundation millimeter wave radar perception

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN108914815A (en) * 2018-05-17 2018-11-30 中铁大桥科学研究院有限公司 Bridge floor vehicular load identification device, bridge and bridge load are distributed recognition methods
CN108914815B (en) * 2018-05-17 2020-09-29 中铁大桥科学研究院有限公司 Bridge deck vehicle load identification device, bridge and bridge load distribution identification method
CN111060160A (en) * 2020-01-03 2020-04-24 防灾科技学院 GB-SAR-based high-speed rail simply-supported box girder operation performance parameter testing method
CN112034454A (en) * 2020-08-03 2020-12-04 北京理工大学 Bridge self-vibration mode obtaining method based on MIMO radar
CN113419222B (en) * 2021-05-10 2022-12-16 北方工业大学 Method and system for extracting bridge vibration frequency based on radar signals
CN113419222A (en) * 2021-05-10 2021-09-21 北方工业大学 Method and system for extracting bridge vibration frequency based on radar signals
CN115060208A (en) * 2022-06-30 2022-09-16 国网山东省电力公司电力科学研究院 Power transmission and transformation line geological disaster monitoring method and system based on multi-source satellite fusion
CN116819516A (en) * 2023-03-29 2023-09-29 中国科学院国家空间科学中心 High-speed railway bridge vibration monitoring radar system
CN116499671A (en) * 2023-06-27 2023-07-28 南京隼眼电子科技有限公司 Bridge deflection monitoring method and device based on millimeter wave radar and storage medium
CN116499671B (en) * 2023-06-27 2023-09-01 南京隼眼电子科技有限公司 Bridge deflection monitoring method and device based on millimeter wave radar and storage medium
CN116973877A (en) * 2023-09-22 2023-10-31 南京楚航科技有限公司 Millimeter wave radar deformation measurement method, system and measurement truth value calibration method
CN116973877B (en) * 2023-09-22 2023-12-12 南京楚航科技有限公司 Millimeter wave radar deformation measurement method, system and measurement truth value calibration method
CN118465731A (en) * 2024-07-15 2024-08-09 苏交科集团股份有限公司 Bridge multi-point displacement influence line synchronous identification method, system and storage medium based on foundation millimeter wave radar perception

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Application publication date: 20180406