CN110455563A - Highway steel bridge fatigue analysis method based on measured stress spectrum - Google Patents
Highway steel bridge fatigue analysis method based on measured stress spectrum Download PDFInfo
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- CN110455563A CN110455563A CN201910670708.0A CN201910670708A CN110455563A CN 110455563 A CN110455563 A CN 110455563A CN 201910670708 A CN201910670708 A CN 201910670708A CN 110455563 A CN110455563 A CN 110455563A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
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Abstract
The present invention relates to road and bridge engineering Inspection Technique fields, and it discloses the highway steel bridge fatigue analysis method composed based on measured stress, the strain detecting data for solving current measurement method acquisition have more invalid clutter technical problem, S1, obtain data；S2, strain data signal processing, comprising: S21, filtering；S22, peak extraction；S23, the filtering of small Cyclic Stress；S24, baseline drift processing；S3, rain flow way Cyclic Stress statistics, count to obtain stress spectra according to rain flow way；S4, using Fatigue Life Assessment theory, fatigue problem is assessed, each measuring point fatigue damage and remaining life are calculated.According to above technical scheme, repeated strain monitoring data are obtained and acquired first by measurement method, then the repeated strain monitoring data of acquisition are successively filtered, peak extraction, small Cyclic Stress filtering and baseline drift processing etc. operation, each measuring point fatigue damage and remaining life are finally calculated, to achieve the purpose that improve assessment accuracy and reliability.
Description
Technical field
The present invention relates to road and bridge engineering Inspection Technique fields, more specifically, it relates to based on measured stress spectrum
Highway steel bridge fatigue analysis method.
Background technique
With the growth of highway in China steel bridge active time, the structure to guarantee steel structure bridge is safe, based on actual measurement
Repeated strain data obtain highway steel bridge stress spectra and analysis of Fatigue-life are studied.Although building the tradition of bridge
The fatigue properties of Steel material have been studied very thoroughly, but the fatigue failure of bridge still repeated.Cause great casualties
And huge economic losses.
In order to measure the remaining life of bridge, currently, design is all made of traditional fatigue point on the bridge of most of country
Analysis method.Classic fatigue analysis method establishes that (also known as Wei Le curve, reflection applied stress is horizontal and Cyclic Stress in S-N curve
Number relationships) and linear elasticity damage accumulation it is theoretical on, be a kind of method based on experience.The Simulating of Fatigue Stress Spectra of component need to only be obtained
With characterize its fatigue resistance S-N curve, according to Rule of Fatigue Damage Accumulation, so that it may calculate bridge remaining life.Currently, tired
Labor stress spectra can be obtained by following two approach, measurement method and simulation, be all made of measurement method in most steel bridge fatigue researchs,
It is analyzed by collection in worksite strain signal, or theoretical analysis method is verified.
But above-mentioned measurement method, in actual application process, according to engineering experience, the collected strain of measurement method is supervised
It surveys signal and is highly susceptible to the interference of collection site various factors, containing the invalid clutter for being largely not belonging to structural response, so that tired
The assessment accuracy in labor service life is poor, reliability is low.
Summary of the invention
For the strain detecting data of the measurement method acquisition proposed in background technique there is more invalid clutter technology to ask
Topic, the present invention is intended to provide the highway steel bridge fatigue analysis method based on measured stress spectrum, is obtained and adopted by measurement method first
Collect repeated strain monitoring data, then the repeated strain monitoring data of acquisition is successively filtered, peak extraction, small stress follow
The operation such as ring filtering and baseline drift processing, finally calculates each measuring point fatigue damage and remaining life, comments to reach raising
Estimate the purpose of accuracy and reliability.
To achieve the above object, the present invention provides the following technical scheme that
Based on the highway steel bridge fatigue analysis method of measured stress spectrum, including following operating procedure:
S1, data are obtained, at the scene highway steel bridge position, repeated strain monitoring data is obtained and acquired by measurement method, and will
Repeated strain monitoring data are successively recorded by table；
S2, strain data signal processing handle the repeated strain monitoring data of actual measurement, improve the reliability of data, tool
Body:
S21, filtering are filtered using repeated strain monitoring data of the Butterworth low-pass filter to record；
S22, peak extraction, by strain random signal compression editor, by repeated data and be clipped in peak stress and valley it
Between data delete, and compress edited signal and keep sequencing relationship between original signal, obtain actually useful
Random signal；
S23, the filtering of small Cyclic Stress will will not generate the data filtering of materially affect to fatigue life in stress course curve
Fall, reduces interference of the minor fluctuations to the range of stress of key effect in Cyclic Stress；
S24, baseline drift processing, are consistent the datum mark of signal in monitoring process with initial baseline point always；
S3, rain flow way Cyclic Stress statistics, count to obtain stress spectra according to rain flow way；
S4, using Fatigue Life Assessment theory, fatigue problem is assessed, each measuring point fatigue damage and remaining life are calculated.
Through the above technical solutions, firstly, being obtained by measurement method and acquiring repeated strain monitoring data, then, to obtaining
The behaviour such as the repeated strain monitoring data taken are successively filtered, peak extraction, small Cyclic Stress filter and baseline drift is handled
Make, finally, calculating each measuring point fatigue damage and remaining life.Wherein, peak extraction process by repeated data and is clipped in stress
Data between peak value and valley are deleted, and compress the sequencing relationship between edited signal holding original signal, are obtained
To actually useful random signal, to improve assessment reliability and accuracy.Meanwhile small Cyclic Stress filtering reduces Cyclic Stress
Interference of the middle minor fluctuations to the range of stress of key effect, further increases assessment reliability and accuracy.In next step,
Baseline drift processing, is consistent the datum mark of signal in monitoring process with initial baseline point always, further improves and comments
Estimate reliability and accuracy, and then achievees the purpose that improve assessment accuracy and reliability.
The present invention is further arranged to: the mode that data are obtained in the S1 is that each measurement point in scene is obtained based on measurement method
Repeated strain monitoring data.
The present invention is further arranged to: in the S21, since the order of Butterworth low-pass filter is higher, i.e. and N
Be worth it is bigger, then band logical and with resistance approximation it is better, the characteristic of intermediate zone is steeper, but larger to the weakening of peak region signal；By
The value of the part being concerned about the most in stress monitoring exactly peak region, therefore the rank of steel bridge stress monitoring signal digital filter
It is secondary unsuitable excessively high.
Through the above technical solutions, filtering is technology the most basic and important in signal processing, it is mainly used for eliminating electricity
Clutter caused by magnetic disturbance, to improve final assessment reliability and accuracy.
The present invention is further arranged to: in the S22, strain random signal compresses edited data volume and is about reduced to original
Come the 1/3 of data volume.
Through the above technical solutions, strain random signal compresses edited data volume is about reduced to original data volume 1/
3, the time of calculating can be greatly reduced.
The present invention is further arranged to: in the S23, the Cyclic Stress for surveying the stress course curve of structure can be divided into three
Class: main wave, secondary wave and three-level wave；
Main wave refers to that the primary load for causing fatigue damage recycles, that is, the load of the larger range of stress is caused to recycle, i.e., such wave
Substantially the work load of component is represented；Secondary wave refers to that the load due to caused by the factors such as the low order rebound vibration of structural elements follows
Ring, the range of stress are small；Three-level wave refers to those far below the fluctuation that the high frequent vibration of the structural fatigue limit generates, these fluctuations
It will not influence the materially affect of fatigue life generation；
Small Cyclic Stress filtering refers to the filtering to three-level wave.
The present invention is further arranged to: those in three-level wave are far below the fluctuation that the high frequent vibration of the structural fatigue limit generates
Refer to the 10% fluctuation numerical value less than the fatigue limit of materials.
Through the above technical solutions, those in three-level wave are far below the fluctuation that the high frequent vibration of the structural fatigue limit generates
Refer to the 10% fluctuation numerical value for being less than the fatigue limit of materials, therefore, what is filtered out in small Cyclic Stress filtration step is the material
The fluctuation numerical value of the 10% of fatigue limit.
The present invention is further arranged to: in the S24, baseline drift processing, for eliminate baseline drift, first to signal into
Row fitting, then subtracts the data that fitting obtains by measured value, to can be modified to test result.
Through the above technical solutions, measured value is subtracted the data value that fitting obtains, the mesh for retracting baseline can be reached
, so that the datum mark of signal is consistent with initial baseline point always in monitoring process.
The present invention is further arranged to: in the S4, Fatigue Life Assessment theory utilizes Britain's bridge specification BS-5400 institute
It is recommended that Fatigue Life Assessment it is theoretical.
Through the above technical solutions, being carried out using Fatigue Life Assessment theory proposed by Britain bridge specification BS-5400
The calculating in service life can be improved the accuracy rate of service life calculating.
In conclusion the invention has the following advantages:
(1) since either load or finite element model has a large amount of hypothesis and simplify, and the dependent variable of actual measurement is used
It is most accurately and reliably method according to Fatigue Life Assessment is carried out；
(2) actual measurement strain signal there are the data that more repeated data, intermediate data and small strain recycle, and due to by
The influence of external environment, signal are easy to happen needle position misalignment；
(3) it by operations such as filtering, peak extraction, the filtering of small Cyclic Stress and baseline drift processing, can be significantly reduced tired
Labor analyzes workload, improves accuracy and efficiency
(4) the result shows that structure fatigue damage is smaller, fatigue surplus life is longer for structural fatigue analysis.
Detailed description of the invention
Fig. 1 is the flow diagram of fatigue analysis method.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in further detail, but embodiments of the present invention are not only
It is limited to this.
Based on the highway steel bridge fatigue analysis method of measured stress spectrum, including following operating procedure:
S1, data are obtained, at the scene highway steel bridge position, repeated strain monitoring data is obtained and acquired by measurement method, and will
Txt file is written in repeated strain monitoring data；
S2, strain data signal processing handle the repeated strain monitoring data of actual measurement, improve the reliability of data, tool
Body:
S21, filtering are filtered using repeated strain monitoring data of the Butterworth low-pass filter to record；
S22, peak extraction, by realizing strain for repeated data and the data being clipped between peak stress and valley deletion
Random signal compression editor, and the sequencing relationship between edited signal holding original signal is compressed, really had
Random signal；
S23, the filtering of small Cyclic Stress will will not generate the data filtering of materially affect to fatigue life in stress course curve
Fall, reduces interference of the minor fluctuations to the range of stress of key effect in Cyclic Stress；
S24, baseline drift processing, are consistent the datum mark of signal in monitoring process with initial baseline point always；
S3, rain flow way Cyclic Stress statistics, count to obtain stress spectra according to rain flow way；
S4, using Fatigue Life Assessment theory, fatigue problem is assessed, each measuring point fatigue damage and remaining life are calculated.
The mode that data are obtained in the S1 is that the repeated strain monitoring data of each measurement point in scene are obtained based on measurement method.
In the S21, since the order of Butterworth low-pass filter is higher, i.e. N value is bigger, then band logical and with resistance
Approximation it is better, the characteristic of intermediate zone is steeper, but larger to the weakening of peak region signal；Due to being concerned about the most in stress monitoring
Part exactly peak region value, therefore the order of steel bridge stress monitoring signal digital filter is unsuitable excessively high.
In the S22, strain random signal compresses edited data volume is about reduced to original data volume 1/3, significantly
Reduce the time of calculating.
In the S23, the Cyclic Stress for surveying the stress course curve of structure can be divided into three classes: main wave, secondary wave and three
Grade wave；
Main wave refers to that the primary load for causing fatigue damage recycles, that is, the load of the larger range of stress is caused to recycle, i.e., such wave
Substantially the work load of component is represented；Secondary wave refers to that the load due to caused by the factors such as the low order rebound vibration of structural elements follows
Ring, the range of stress are small；Three-level wave refers to those far below the fluctuation that the high frequent vibration of the structural fatigue limit generates, these fluctuations
It will not influence the materially affect of fatigue life generation；
Small Cyclic Stress filtering refers to the filtering to three-level wave.
Those in three-level wave refer to far below the fluctuation that the high frequent vibration of the structural fatigue limit generates less than fatigue of materials pole
10% fluctuation numerical value of limit.
In the S24, baseline drift processing is first fitted signal, to eliminate baseline drift then by measured value
The data that fitting obtains are subtracted, to can be modified to test result.
Rain flow method in S3 is to be mentioned by two engineers M.Matsuishi and T.Endo of Britain the 1950s
Out.The major function of the counting method is that actual measurement load history is reduced to several load cycles, for estimation of fatigue life
It is used with establishment fatigue test load spectrum.It is based on two parameter method, it is contemplated that fatigue resistance (amplitude) and static strength (mean value)
Two variables meet the characteristic of fatigue load inherently.Rain flow method is mainly used for engineering circles, especially in fatigue life gage
With very extensive in calculation.
In the S4, Fatigue Life Assessment theory utilizes Fatigue Life Assessment proposed by Britain's bridge specification BS-5400
It is theoretical.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. the highway steel bridge fatigue analysis method based on measured stress spectrum, which is characterized in that including following operating procedure:
S1, data are obtained, at the scene highway steel bridge position, repeated strain monitoring data is obtained and acquired by measurement method, and will
Txt file is written in repeated strain monitoring data；
S2, strain data signal processing call the monitoring data recorded in txt file, to the repeated strain monitoring data of actual measurement
It is handled, improves the reliability of data, specific:
S21, filtering are filtered using repeated strain monitoring data of the Butterworth low-pass filter to record；
S22, peak extraction, by realizing strain for repeated data and the data being clipped between peak stress and valley deletion
Random signal compression editor, and the sequencing relationship between edited signal holding original signal is compressed, really had
Random signal；
S23, the filtering of small Cyclic Stress will will not generate the data filtering of materially affect to fatigue life in stress course curve
Fall, reduces interference of the minor fluctuations to the range of stress of key effect in Cyclic Stress；
S24, baseline drift processing, are consistent the datum mark of signal in monitoring process with initial baseline point always；
S3, rain flow way Cyclic Stress statistics, count to obtain stress spectra according to rain flow way；
S4, using Fatigue Life Assessment theory, fatigue problem is assessed, each measuring point fatigue damage and remaining life are calculated.
2. the highway steel bridge fatigue analysis method according to claim 1 based on measured stress spectrum, it is characterised in that: described
The mode that data are obtained in S1 is that the repeated strain monitoring data of each measurement point in scene are obtained based on measurement method.
3. the highway steel bridge fatigue analysis method according to claim 1 based on measured stress spectrum, it is characterised in that: described
In S21, since the order of Butterworth low-pass filter is higher, i.e. N value is bigger, then band logical and with resistance approximation it is better,
The characteristic of intermediate zone is steeper, but larger to the weakening of peak region signal；Exactly due to the part be concerned about the most in stress monitoring
The value of peak region, therefore the order of steel bridge stress monitoring signal digital filter is unsuitable excessively high.
4. the highway steel bridge fatigue analysis method according to claim 1 based on measured stress spectrum, it is characterised in that: described
In S22, strain random signal compresses edited data volume is about reduced to original data volume 1/3.
5. the highway steel bridge fatigue analysis method according to claim 1 based on measured stress spectrum, it is characterised in that: described
In S23, the Cyclic Stress for surveying the stress course curve of structure can be divided into three classes: main wave, secondary wave and three-level wave；
Main wave refers to that the primary load for causing fatigue damage recycles, that is, the load of the larger range of stress is caused to recycle, i.e., such wave
Substantially the work load of component is represented；Secondary wave refers to that the load due to caused by the factors such as the low order rebound vibration of structural elements follows
Ring, the range of stress are small；Three-level wave refers to those far below the fluctuation that the high frequent vibration of the structural fatigue limit generates, these fluctuations
It will not influence the materially affect of fatigue life generation；
Small Cyclic Stress filtering refers to the filtering to three-level wave.
6. the highway steel bridge fatigue analysis method according to claim 5 based on measured stress spectrum, it is characterised in that: three-level
Those in wave refer to 10% fluctuation less than the fatigue limit of materials far below the fluctuation that the high frequent vibration of the structural fatigue limit generates
Numerical value.
7. the highway steel bridge fatigue analysis method according to claim 1 based on measured stress spectrum, it is characterised in that: described
In S24, baseline drift processing is first fitted signal, then subtracts fitting by measured value and obtain to eliminate baseline drift
Data, to can be modified to test result.
8. the highway steel bridge fatigue analysis method according to claim 7 based on measured stress spectrum, it is characterised in that: described
In S4, Fatigue Life Assessment theory is theoretical using Fatigue Life Assessment proposed by Britain's bridge specification BS-5400.
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Cited By (4)
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| CN112924181A (en) * | 2020-11-13 | 2021-06-08 | 一汽解放汽车有限公司 | Method and device for testing local fatigue life of vehicle frame |
| CN113515810A (en) * | 2021-05-17 | 2021-10-19 | 中车长春轨道客车股份有限公司 | Motor train unit bogie design and development method based on reliability and safety analysis |
| CN113607580A (en) * | 2021-08-10 | 2021-11-05 | 江苏徐工工程机械研究院有限公司 | Metal component fatigue test method and residual life prediction method |
| CN116882021A (en) * | 2023-07-21 | 2023-10-13 | 北京云庐科技有限公司 | Fatigue damage assessment method, device, equipment and storage medium |
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