CN104820234B - Quick identification method for earthquake load of bridge - Google Patents
Quick identification method for earthquake load of bridge Download PDFInfo
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- CN104820234B CN104820234B CN201510173245.9A CN201510173245A CN104820234B CN 104820234 B CN104820234 B CN 104820234B CN 201510173245 A CN201510173245 A CN 201510173245A CN 104820234 B CN104820234 B CN 104820234B
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Abstract
The invention discloses a quick identification method for earthquake load of a bridge, which comprises the following steps: a step 10) acquiring an acceleration data sample, connecting an acceleration sensor in an acceleration acquiring system, and then acquiring the acceleration of a measuring point by means of the acceleration sensor, thereby forming the acceleration data sample; a step 20) performing stability checking on the acquired data, if the data after checking are not stable, an earthquake effect may exists; a step 30) drawing an acceleration time history envelope; and a step 40), quickly identifying an earthquake action according to the characteristic of the acceleration time history envelope, namely when the acceleration time history envelope has a trend of gradually increasing and afterwards gradually reducing, the earthquake action can be determined. The quick identification method can accurately and quickly identify the earthquake action according to data information which is acquired in bridge health monitoring.
Description
Technical field
The present invention relates to a kind of method for quickly identifying of bridge geological process, belongs to bridge health monitoring field.
Background technology
Bridge health monitoring is monitored and assessment to bridge structure situation by the method for real-time monitoring, there is provided relevant bridge
Girder construction behavior and environment rule are most truly information, are bridge under special climate, transportation condition or bridge operation situation
Early warning signal is sent when abnormal serious, the maintenance and repair and management decision-making for bridge provides foundation and guidance.We need basis
Data message and prior art that collection comes, judge which kind of load is bridge structure be subject in certain time period, so as to be defined
Really assessment bridge operation conditions and follow-up maintenance management provides foundation.Extreme load suffered by bridge structure mainly has：Earthquake, ship
Hit, high wind, heavy rain.At present, high wind and heavy rain effect, have preferable method recognize that wind load is generally by wind speed at present
Instrument is measured, and heavy rain can be measured by rain flowmeter.But geological process is used as topmost extreme load effect suffered by bridge structure
One of, but out, especially it is quite similar with the time-history curves that ship hits effect for None- identified.Therefore, it is real-time to what is collected
Monitoring Data is analyzed, and quickly recognizes the response of bridge geological process, understands the actual loading situation of bridge structure in time, be
Further design maintenance provides foundation, and tool is of great significance.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of the fast of bridge geological process
Fast recognition methodss, quickly and accurately to identify bridge geological process.
Technical scheme：To solve above-mentioned technical problem, the method for quickly identifying of the bridge earthquake load that the present invention is provided, bag
Include following steps：
Step 10) collection bridge acceleration monitoring data；
Step 20) section of geological process is there may be using the method choice of stationary test；
Step 30) rendering accelerating degree time-histories envelope；
Step 40) geological process is identified according to acceleration envelope diagram feature.
Specifically, the step 10) acquisition method be that acceleration transducer is coupled in bridge health monitoring system,
Then the accekeration of measuring point is acquired using these sensors, sample frequency is 20Hz, the information that sensor will be obtained
It is delivered in acquisition system, forms sample, sample includes not corresponding accekeration in the same time；
The step 10) in the data that gathered include the vertical bridge of bridge cable tower tower top direction across bridge acceleration, Sarasota tower top to
Top board direction across bridge acceleration between top board vertical acceleration, girder truss between acceleration, girder truss, upstream side drag-line acceleration and
Downstream drag-line acceleration.
Specifically, the step 20) system of selection be to be analysed to data to be divided into n groups, n according to total strong point
Count to determine, be divided into one group per 100 data, then(symbolRepresent downward to the value in symbol
Round), acceleration maximum in every a small group is taken respectively, is chronologically designated as b1, b2, b3..., bn-1, bn；
Before riding Quality Analysis are carried out, n acceleration is carried out into initial value zero, will all n values deduct b1, obtain
b1', b2', b3' ..., bn-1', bn', b1'=b1-b1=0, b2'=b2-b1, b3'=b3-b1..., bn-1'=bn-1-b1, bn'=
bn-b1；B after initial value is zeroed1', b2', b3' ..., bn-1', bn' this n value is divided into m parts, and m is also regarding data points
Fixed, can use, m round numbers；Stationary test in 0.05 confidence level is carried out to every part of accekeration, if m
The result that part data segment is verified all is stable, then there is no geological process certainly, if the result for verifying has non-stationary
Data segment, then there may be geological process；Note Non-stationary Data section start time is t1, finish time is t2, it is desirable to [t1,
t2] one or several continuous Non-stationary Data sections can only be included in the time period, not comprising there is stable data section, then [t1, t2] be
The time period that geological process may occur.
Specifically, the Acceleration time course envelope is that data are divided into after n groups, by per group of maximum of points b1, b2,
b3..., bn-1, bnIt is linked to be a curve, forms the time-histories envelope of whole data to be analyzed, overall time-histories envelope is fallen
[t1, t2] envelope in the time period may be in time of origin section as geological process time-histories envelope line chart.
Specifically, the step 40) be according to step 20) and 30) time-histories envelope line chart is identified：If [t1, t2] when
Between the envelope of Acceleration time course is gradually decreased after showing first to increase suddenly in section trend, then the non-stationary of Acceleration time course
Characteristic is caused by the ship effect of hitting, rather than geological process；If [t1, t2] envelope of Acceleration time course shows in the time period
The trend gradually decreased after first gradually increasing, then the non-stationary property of Acceleration time course caused by geological process.
At present, other load effects, such as high wind, heavy rain, can be fairly simple identify, but geological process be difficult know
Out, the present invention is not in step 20) in first select the section that there may be geological process using the method for stationary test.
And according to step 20) and 30), the response section that there may be geological process can only be selected.Due to ship collision
The acceleration-time curve that effect and geological process are caused has identical non-stationary, i.e., no ship hits and acts on or geological process
When, Acceleration time course shows as the gentle stationary random process that fluctuates；And when having the ship effect of hitting or geological process, acceleration
Time-histories shows the non-stationary stochastic behaviour of upper and lower big ups and downs, therefore, it is also desirable to further discriminate between earthquake and the ship effect of hitting.
Therefore by judging [t1, t2] geological process and the ship effect of hitting can just be caused by the envelope feature of Acceleration time course in the time period
Response distinguish：If [t1, t2] envelope of Acceleration time course is gradually decreased after showing first to increase suddenly in the time period
Trend, then the non-stationary property of Acceleration time course caused by the ship effect of hitting, rather than geological process；If [t1, t2] in the time period
The envelope of Acceleration time course shows the trend gradually decreased after elder generation gradually increases, then the non-stationary property of Acceleration time course is
Caused by geological process.So as to quickly identify geological process.
Beneficial effect：
(1) accurately identify bridge geological process.The present invention is based on health monitoring gathered data information, there is provided quick to recognize
The method of bridge geological process.Due to geological process response rule be certain, be acceleration-time curve non-stationary and
Envelope is the rule being gradually reduced after elder generation gradually increases, it is ensured that the accuracy and science of recognition methodss of the present invention.
(2) the recognition methodss simple and fast, can be very good to apply to engineering in practice.The recognition methodss thinking of the present invention
Clearly, principle is simple, with good feasibility, compensate in existing health monitoring field, it is impossible to according to institute's gathered data letter
Breath identifies the present situation of geological process.According to the data for real-time monitoring, using the method for the present invention, quickly and easily can sentence
Whether bridge cut-off beam has is occurred in section at what time by geological process and geological process.The recognition methodss of the present invention are applicable
In the identification of geological process suffered by different types of rridges structure so that this method is simple when bridge geological process is recognized, quick, can obtain
To being widely popularized and apply.
Except invention described above solve technical problem, constitute technical scheme technical characteristic and by these skills
Outside the advantage brought by the technical characteristic of art scheme, the present invention bridge earthquake load method for quickly identifying can solve its
The advantage that the other technical characteristics and these technical characteristics included in his technical problem, technical scheme are brought, will combine accompanying drawing
It is described in more detail.
Description of the drawings
Fig. 1 is the change curve of Su-Tong Brideg different parts each load effect when Wenchuan earthquake occurs；
Fig. 1 (a) is northern Sarasota tower top direction across bridge acceleration change curve chart；
Fig. 1 (b) is the vertical bridge of northern Sarasota tower top to acceleration change curve chart；
Fig. 1 (c) is top board vertical acceleration change curve between girder NA103 truss and No. 4 truss；
Fig. 1 (d) is top board direction across bridge acceleration change curve chart between girder NA103 truss and No. 4 truss；
Fig. 1 (e) is NA34 beam sections upstream side A34 drag-line acceleration change curve charts；
Fig. 1 (f) is downstream A34 drag-line acceleration change curve charts；
Fig. 2 is that earthquake and ship strike and answer time-histories change curve comparison diagram；
Fig. 2 (a) is seismic response changing course curve；
Fig. 2 (b) ships strike answers time-histories change curve；
Fig. 3 is the changing trend diagram of 720 accekerations；
Fig. 4 is the changing trend diagram of 720 accekerations after initial value zero；
Fig. 5 is the coenvelope line of 720 accekerations after initial value is zeroed.
Specific embodiment
Embodiment：
The continuous mode of the method for quickly identifying of the bridge geological process of the present embodiment comprises the steps：
Step 10)：Collection bridge acceleration monitoring data.
Acceleration transducer is coupled in bridge health monitoring system, then the acceleration using these sensors to measuring point
Angle value is acquired, and sample frequency is 20Hz, and the information transmission for obtaining in acquisition system, is formed sample, sample by sensor
Comprising not corresponding accekeration in the same time.
Fig. 1 show when the Wenchuan earthquake of on May 12nd, 2008 occurs 14 when 15, Su-Tong Brideg north Sarasota tower top is horizontal
Bridge is to acceleration, the vertical bridge of northern Sarasota tower top to top board vertical acceleration, master between acceleration, girder NA103 truss and No. 4 truss
Top board direction across bridge acceleration, NA34 beam sections upstream side A34 drag-lines acceleration and downstream between beam NA103 truss and No. 4 truss
The monitoring result of A34 drag-line acceleration.
Step 20)：The section of geological process be there may be using the method choice of stationary test.
It is analysed to data and is divided into n groups, n is determined according to the number at total strong point, is divided into one group per 100 data, thenAcceleration maximum in every a small group is taken respectively, is chronologically designated as b1, b2, b3...,
bn-1, bn。
Before riding Quality Analysis are carried out, it is necessary to which n acceleration is carried out initial value zero, will all n values deduct b1,
Obtain b1', b2', b3' ..., bn-1', bn', i.e.,：b1'=b1-b1=0, b2'=b2-b1, b3'=b3-b1..., bn-1'=bn-1-
b1, bn'=bn-b1.B after initial value is zeroed1', b2', b3' ..., bn-1', bn' this n value is divided into m parts, and m is also regarding number
Depending on the number of strong point, can useStationary test in 0.05 confidence level is carried out to every part of accekeration, is put down
Stability inspection is a kind of universal method.If the result that m part data segments are verified all is stable, there is no certainly earthquake work
With if the result for verifying has the data segment of non-stationary, there may be geological process.Remember that continuous Non-stationary Data section starts
Moment is t1, finish time is t2, it is desirable to [t1, t2] one or several continuous Non-stationary Data sections can only be included in the time period,
Not comprising there is stable data section, then [t1, t2] time period that may occur for geological process.
Step 30) Acceleration time course envelope drafting
By step 20) method, data are divided into after n groups, by per group of maximum of points b1, b2, b3..., bn-1, bnIt is linked to be
One curve, just into the time-histories envelope of all whole data to be analyzed, overall time-histories envelope falls in [t1, t2] time period
Time-histories envelope line chart in the possible time of origin section of interior envelope geological process.
Step 40) geological process is identified according to Acceleration time course envelope feature.
As seen from Figure 2：Differring primarily in that between the effect of hitting of geological process and ship：(1) geological process is one
Persistent Excitation process, the load effect produced by geological process are the processes gradually decreased after an elder generation gradually increases；(2) ship hits
Effect is an instantaneous excitation process, and the load effect produced by the ship effect of hitting is rushing of gradually decreasing after an elder generation increases suddenly
Hit attenuation process.Therefore, if the envelope of Acceleration time course shows the trend gradually decreased after elder generation increases suddenly, acceleration
The non-stationary property of time-histories is caused by the ship effect of hitting, rather than geological process；If the envelope of Acceleration time course shows elder generation
The trend that gradually decreases after gradually increasing, then the non-stationary property of Acceleration time course caused by geological process.So as to final
Identify geological process.
When occurring with the Wenchuan earthquake of on May 12nd, 2008 14 when 15, Su-Tong Brideg girder NA103 truss and 4
Between number truss as a example by the record result of top board vertical acceleration (as shown in Fig. 1 (c)), checking carries out ground using the method for the present invention
The effectiveness of shake effect identification.Sample frequency is 20Hz, therefore the accelerogram result of a hour has 72000 numbers
According to.
(1) with 100 accekerations as one group, 720 groups are divided into, one maximum of per group of selection selects 720 most altogether
Big to be worth, the variation tendency of 720 accekerations is as shown in Figure 3.Before riding Quality Analysis are carried out to 720 accekerations, it is necessary to
720 acceleration are carried out into initial value zero, will all 720 values deduct first value, as a result as shown in Figure 4；
(3) 720 values after be zeroed initial value are divided into 20 parts, and every part of accekeration is carried out in 0.05 confidence level
Stationary test, the 13rd part, 14 parts, 15 parts and 18 parts of assay is the null hypothesises for not refusing to there is unit root, i.e.,
13 parts, 14 parts, 15 parts and 18 parts of acceleration change have it is non-stationary, due to except geological process and ship hit effect in addition to its
It is non-stationary that its load produces will not acceleration change, therefore assay explanation has geological process or the ship effect of hitting；
(4) the coenvelope line for further extracting 720 accekerations after initial value zero is as shown in Figure 5, it can be seen that
The envelope of Acceleration time course shows the trend gradually decreased after elder generation gradually increases, then the non-stationary property of Acceleration time course is
Caused by geological process, so as to carry out earthquake disaster warning.
Embodiments of the present invention are described in detail above in association with accompanying drawing, but the present invention is not limited to described reality
Apply mode.For one of ordinary skill in the art, in the range of the principle and technological thought of the present invention, to these enforcements
Mode carries out various changes, modification, replacement and deformation and still falls within protection scope of the present invention.
Claims (4)
1. a kind of method for quickly identifying of bridge earthquake load, comprises the steps：
Step 10) collection bridge acceleration monitoring data；
Step 20) section of geological process is there may be using the method choice of stationary test；
Step 30) rendering accelerating degree time-histories envelope；
Step 40) geological process is identified according to acceleration envelope diagram feature；
It is characterized in that：The step 20) system of selection be to be analysed to data to be divided into n groups, n according to total strong point
Count to determine, be divided into one group per 100 data, thenIt is maximum that acceleration in every a small group is taken respectively
Value, is chronologically designated as b1, b2, b3..., bn-1, bn；Wherein symbolExpression is rounded to the value in symbol downwards；
Before riding Quality Analysis are carried out, n acceleration is carried out into initial value zero, will all n values deduct b1, obtain b1',
b2', b3' ..., bn-1', bn', b1'=b1-b1=0, b2'=b2-b1, b3'=b3-b1..., bn-1'=bn-1-b1, bn'=bn-
b1；B after initial value is zeroed1', b2', b3' ..., bn-1', bn' this n value is divided into m parts, and m is also depending on data points
, takeM round numbers；Stationary test in 0.05 confidence level is carried out to every part of accekeration, if m numbers
All it is stable according to the result that section is verified, then there is no geological process certainly, if the result for verifying has the number of non-stationary
According to section, then geological process is there may be；Note Non-stationary Data section start time is t1, finish time is t2, it is desirable to [t1, t2] when
Between one or several continuous Non-stationary Data sections can only be included in section, not comprising there is stable data section, then [t1, t2] for earthquake
The time period that effect may occur.
2. the method for quickly identifying of bridge earthquake load according to claim 1, it is characterised in that：The step 10)
Acquisition method is that acceleration transducer is coupled in bridge health monitoring system, then measuring point is added using these sensors
Velocity amplitude is acquired, and sample frequency is 20Hz, and the information transmission for obtaining in acquisition system, is formed sample, sample by sensor
This includes not corresponding accekeration in the same time；
The step 10) in the data that gathered include the vertical bridge of bridge cable tower tower top direction across bridge acceleration, Sarasota tower top to acceleration
Degree, top board direction across bridge acceleration, upstream side drag-line acceleration and downstream between top board vertical acceleration, girder truss between girder truss
Layback rope acceleration.
3. the method for quickly identifying of bridge earthquake load according to claim 1, it is characterised in that：The Acceleration time course
Envelope is that data are divided into after n groups, by per group of maximum of points b1, b2, b3..., bn-1, bnIt is linked to be a curve, is formed whole
The time-histories envelope of individual data to be analyzed, overall time-histories envelope is fallen in [t1, t2] envelope in the time period makees as earthquake
With the time-histories envelope line chart in possible time of origin section.
4. the method for quickly identifying of bridge earthquake load according to claim 3, it is characterised in that：The step 40) be
According to step 20) and 30) time-histories envelope line chart is identified：If [t1, t2] the envelope performance of Acceleration time course in the time period
Go out the trend gradually decreased after first increasing suddenly, then the non-stationary property of Acceleration time course is caused by the ship effect of hitting, rather than
Geological process；If [t1, t2] envelope of Acceleration time course is gradually decreased after showing first gradually to increase in the time period trend,
Then the non-stationary property of Acceleration time course is caused by geological process.
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Families Citing this family (4)
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| CN106568557B (en) * | 2016-10-31 | 2018-08-21 | 东南大学 | A kind of safe early warning method of high-speed railway bridge vehicle-bridge vibration performance |
| CN106570299A (en) * | 2016-11-14 | 2017-04-19 | 东南大学 | Method for determining vehicle-bridge resonance performance curves of high-speed railway steel truss arch bridges |
| CN114166448B (en) * | 2022-02-10 | 2022-04-29 | 西南交通大学 | Method, device and equipment for evaluating operation safety after high-speed rail earthquake and readable storage medium |
| CN115685323A (en) * | 2023-01-01 | 2023-02-03 | 北京云庐科技有限公司 | Bridge online real-time simulation computing system based on earthquake load monitoring |
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