CN106871847A - Method based on bridge dynamic strain identification fleet bicycle spacing - Google Patents
Method based on bridge dynamic strain identification fleet bicycle spacing Download PDFInfo
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- CN106871847A CN106871847A CN201710090423.0A CN201710090423A CN106871847A CN 106871847 A CN106871847 A CN 106871847A CN 201710090423 A CN201710090423 A CN 201710090423A CN 106871847 A CN106871847 A CN 106871847A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
Abstract
The invention discloses the method based on bridge dynamic strain identification fleet bicycle spacing, belong to bridge testing detection, health monitoring and overload car and administer field.High-resolution strain detection testing device (sensor) is arranged in beam bridge span centre or maximum strain reaction cross-section, bridge moving strain time history curve under test fleet effect, noise reduction or fitting are filtered to dynamic strain time-history curves, and carry out single order and second order derivation, with reference to finite element analog result, curve derivation result and Vehicle Speed, calculate and obtain fleet's bicycle spacing.The method is only needed to arrange 1 strain testing section on bridge, installed simple, with low cost；Bridge floor or pavement structure need not be destroyed, to existing highway bridge road not damaged；Recognizer is simple, the degree of accuracy is high.
Description
Technical field
Field is administered the present invention relates to bridge testing detection, health monitoring and overload car, bridge dynamic strain is based particularly on
The method of identification fleet bicycle spacing.
Background technology
In recent years, China occurs in that multiple great Bridge Accidents successively.The accident that these occur is relevant with several factors, but
It is a lack of effective monitoring measure and one of the reason for necessary maintenance, maintenance measure are important.These startling accidents
So that people are to the quality of modern bridge and life-span, and also gradually concern is got up.Testing inspection, health monitoring are carried out to bridge structure
With communications and transportation overload control vehicle, it has also become domestic and international academia, the focus of engineering circles research.Traditional bridge machinery is very
The experience of manager and technical staff is depended in big degree, often the situation to bridge particularly large bridge lacks comprehensive
Hold and understand, information cannot be fed back in time.If the disease to bridge is underestimated, just it is likely to lose the optimal of maintenance
On opportunity, accelerate the process of bridge damage, shorten the service life of bridge.If to the disease overestimate of bridge, will cause
Unnecessary fund is wasted so that the bearing capacity of bridge can not give full play to.
At present, the phenomenon of vehicle overload traveling occurs again and again, and the load of bridge is that have certain limit, when these are overweight
Vehicle by bridge, can undoubtedly produce certain infringement to bridge；And over time, bridge it is aging, it holds
Loading capability also in change, therefore the weight that monitoring passes through bridge vehicle, goes forward side by side line number according to statistics, for the healthy shape for understanding bridge
Condition is significant.But generally conventional weighbridge weight measuring equipment is expensive, bicycle road it is generally the least expensive be also required to more than 100,000 yuan, and
Destruction former pavement structure is needed during installation；Routine weighing weighbridge needs artificial or differentiates vehicle and car by picture pick-up device when using
The number of axle；And conventional weighbridge is arranged on the road surface beyond bridge main body structure, it is right that multilane bridge is difficult to using conventional weighbridge
Influence of the driving alongside vehicle to bridge is counted on bridge.Use the conventional car weighed on weighbridge and inapplicable and bridge
Axletree number, axletree away from or axletree weight measurement, so, be badly in need of in society a kind of total suitable for measuring the vehicle that travels in bridge
Weight, axletree number, axletree away from or axletree weight cost effective method or equipment.
The open method that vehicle weight is recognized based on bridge dynamic strain of Chinese patent 201210249735.9, including following step
Suddenly：Dynamic strain measure device is arranged on the longitudinally asymmetric section of bridge；Installing the bridge runway of dynamic strain measure device
On carry out sport car experiment, while gathered data, and send data to computer；Should using theoretical the moving of finite element stimulation
Become, extract the dynamic strain time-history curves that dynamic strain result is formed, and be compared with measured value and correlation analysis, draw driving speed
The relational expression T=f (x, ε) or curve of degree, dynamic strain peak value and vehicle weight；According to each section dynamic strain reach peak value when
Between difference and cross-sectional distance road speed is calculated using software automatically, be averaged with each measuring point dynamic strain peak value in section, bring relation into
Formula T=f (x, ε) or curve are calculated or compared and tried to achieve by the car weight in the section.Driving speed is found here by experiment
The relational expression of degree, dynamic strain peak value and vehicle weight, has that workload is big, adaptability is not high, particularly each bridge
Architectural characteristic differ, so cause to install every time be required for bridge in use is needed to carry out closure experiment,
And test number (TN) is more, installation effectiveness is low, install and use high cost, rate of its popularization is not high, it is impossible to the current bridge of reply China
Measurement demand.
The content of the invention
Goal of the invention of the invention is, regarding to the issue above, there is provided based on bridge dynamic strain identification fleet bicycle spacing
Method, by provide it is a kind of with simple installation, low cost, fleet's bicycle spacing of efficiency high recognition methods, its pass through peace
Filling a dynamic stress sensor can meet measurement demand to bicycle spacing.
To reach above-mentioned purpose, the technical solution adopted in the present invention is：Based between bridge dynamic strain identification fleet bicycle
Away from method, the bridge structure form is beam bridge, and minimum spacing l need to expire before and after beam bridge calculates across footpath L and fleet vehicle
Sufficient relational expressionIt is to fleet's bicycle distance measurement step when many vehicle fleets are by bridge：The dynamic strain is passed
Sensor set section on and being longitudinally arranged along bridge；The dynamic strain sensor is sequentially connected by shielded cable and adopted at a high speed
Storage and processing unit；The high speed acquisition device is acquired to the strain signal of dynamic strain sensor and is sent to processing unit
In；The processing unit is filtered to strain signal and processes and obtain dynamic strain time-history curves, and extraction obtains dynamic strain time-histories
There is interval in the continuous normal strain of curve, and the dynamic strain time-history curves interior normal strain generating region carry out second order derivation treatment
Obtain load factor curve；The processing unit determines according to load factor curve and amplitude threshold and extracts load factor curve
Upper curve corresponding with the bicycle in fleet is interval, calculates the interval amplitude size of the curve；The amplitude threshold is to meet bridge
When the minimum single-point load of beam measurement demand passes through the bridge, the corresponding curve of minimum single-point load in its correspondence load factor curve
Interval amplitude size；The curve interval meets its amplitude size not less than amplitude threshold size；Fleet's bicycle spacing
=[across footpath of the bridge/(it is interval to the interval starting point of normal strain generation to there is first curve of interval positive direction in normal strain
Spacing twice)] × described in two curve interval between spacing.
This programme focus on obtain load factor curve so as to obtain fleet's bicycle spacing, particular by dynamic strain
Sensor obtains strain signal data, and filtering process obtains dynamic strain time-history curves, sets up corresponding two-dimensional coordinate system, confirms
And extract the continuous normal strain generation interval that vehicle passes through, it is ensured that data accuracy, and operation is reduced, improve work effect
Rate；Load factor curve is obtained by carrying out second order derivation to the interior dynamic strain time-history curves in normal strain generating region.Load system
When number curve is that fleet's bicycle passes through dynamic strain sensor test point, corresponding vehicular load is big during correspondence strain variation value mutation
Small coefficient correlation curve, it is unique during the strain caused when each vehicle is by test point；Here it is specifically to make fleet's bicycle
For single concentrfated load is treated.Processing unit according to load factor curve and amplitude threshold determine on load factor curve with fleet
Bicycle correspondence generate or the curve that causes is interval, and calculate the interval amplitude size of the curve, the amplitude size is most Daqu
Line interval amplitude size.Amplitude threshold be meet bridge survey demand minimum single-point load pass through the bridge when, its correspondence lotus
Carry the amplitude size in the corresponding curve interval of minimum single-point load in coefficient curve.Here amplitude threshold ensures to choose fleet's bicycle pair
The correctness for answering curve interval, specifically screens out due to the dynamic strain shadow that the vibration in vehicle travel process or bridge vibration are caused
Ring, reduce error influence.According in load factor curve, the corresponding curve interval of fleet's bicycle is all unique, i.e., amplitude is big
Small is all unique, you can during obtaining bicycle by bridge：Fleet's bicycle is spacing=[across footpath of the bridge/(send out by normal strain
The raw interval twice that the spacing of interval starting point occurs to normal strain of interval first curve of positive direction)] × curve described in two
Spacing between interval.
By contrast, prior art generally passes through dynamic strain time-history curves to Vehicle Axles away from measuring, and specifically leads to
Cross two measuring points of setting, acquire two dynamic strain time-history curves, then using axletree by the time the need for two measuring points and
Speed tries to achieve the vehicle bicycle spacing.Here bicycle spacing in fleet can not be identified, while it is noted that
In order to meet above-mentioned test needs, it is desirable to have two groups of test equipments, it installs measurement cost also accordingly increases.And in this programme,
A group or a test point need to only be installed can be completed to bicycle spacing identification in fleet or measure, and its measurement process is simpler
Just, cost is cheaper, installs and safeguards more convenient and better adaptability.
Wherein, because bridge force-bearing structure type is various, if any by curved beam bridge, the arcuately bridge, the tension oblique pull that are pressurized
Bridge and suspension bridge, compare and force analysis through experiment, and due to beam bridge wide applicability, its force structure is simple, power transmission road
Footpath clearly, active force and the advantages of good structural response linear relationship, recognize that fleet's gross weight or bicycle car weight have using dynamic strain
Preferable mechanical foundation and applicability higher and accuracy of identification, experiment proves that and compare analysis, beam bridge calculate across footpath L with
Minimum spacing l need to meet relational expression before and after fleet vehicleWhen, recognition accuracy can meet bridge testing detection and health
The need for monitoring field.
Preferably, the bridge moving strain value size and fluctuation amplitude under vehicle effect are influenceed by many, only work as vehicle
When gross weight reaches certain numerical value, under the conditions of existing technical merit and instrument and equipment, using dynamic strain recognize fleet's gross weight or
Bicycle car weight can just possess certain applicability and degree of accuracy.According to substantial amounts of verification experimental verification, passed when being strained using high-resolution
Sensor (resolution ratio is not more than 0.1 μ ε) carries out dynamic strain collection, the bridge maximum strain under fleet's gross weight effect
Need to meet(MmaxIt is the maximal bending moment of the bridge strain testing section under vehicle effect, ymaxFor in Edge Distance
Property axle maximum height, IE is the bending rigidity in strain testing section) when, the method has the universal acceptable degree of accuracy.
Preferably, the dynamic strain time-history curves of actual measurement include larger ambient noise and system noise, without noise reduction process
Cannot function as the initial data of identification, the influence factor and feature of comprehensive strain time history curve, the filtering drop that this method is used
Method for de-noising is amplitude limit Glitch Filter.
Preferably, the dynamic strain time-history curves and are carried by processing unit by finite element stimulation theory dynamic strain
Dynamic strain result is taken to be formed.
Due to using above-mentioned technical proposal, the invention has the advantages that：
1. the present invention is suitable for the installation detection of new and old bridge, bridge or pavement of road is not injured in itself, without in
Breaking off a friendship to lead to can complete to install.
2. the present invention only span centre or strain maximum cross-section at arrange 1 strain monitoring section, so integral installation into
This is low and easy for installation.
3. the present invention only needs a dynamic strain time-history curves to recognize fleet's bicycle spacing, therefore analysis identification is more fast
Speed, quick, energy consumption are lower, increased the ageing of data processing.
Brief description of the drawings
Fig. 1 is the strain time history curve after the simply supported beam noise reduction filtering under single Concentrated load of the invention.
Fig. 2 is the single order derived function figure of Fig. 1.
Fig. 3 is the second order derived function figure of Fig. 1.
Fig. 4 is single-point load of the present invention and multi-load strain time history curve.
Fig. 5 is multi-load strain time history curve single order derived function figure in Fig. 4.
Fig. 6 is multi-load strain time history curve second order derived function figure in Fig. 4.
Fig. 7 is embodiment of the present invention actual measurement strain time history curve map.
Fig. 8 is the area that embodiment of the present invention normal strain occurs dynamic strain time-history curves envelope in interval.
Tu9Shi embodiment of the present invention fleet bicycle spacing identification schematic diagram.
Figure 10 is embodiment of the present invention strain time history curve derived function figure.
Specific embodiment
The specific implementation invented is further illustrated below in conjunction with accompanying drawing.
Based on the method for bridge dynamic strain identification fleet bicycle spacing, the bridge structure form is beam bridge, beam bridge
Minimum spacing l need to meet relational expression before and after calculating across footpath L and fleet vehicleWhen many vehicle fleets pass through bridge to this
Fleet's bicycle distance measurement step is：The dynamic strain sensor set section on and being longitudinally arranged along bridge；It is described dynamic
Strain transducer is sequentially connected high speed acquisition device and processing unit by shielded cable；The high speed acquisition device is sensed to dynamic strain
The strain signal of device is acquired and is sent in processing unit；The processing unit is filtered to strain signal and processes and obtain
To dynamic strain time-history curves, the continuous normal strain generation interval for obtaining dynamic strain time-history curves is extracted, and to normal strain generating region
Interior dynamic strain time-history curves carry out second order derivation treatment and obtain load factor curve；The processing unit is according to load factor
Curve and amplitude threshold determine and extract on load factor curve that corresponding with the bicycle in fleet curve is interval, calculates the curve
Interval amplitude size；The amplitude threshold be meet bridge survey demand minimum single-point load pass through the bridge when, its is right
Answer the amplitude size in the corresponding curve interval of minimum single-point load in load factor curve；The curve interval meets its amplitude size
Not less than amplitude threshold size；Fleet's bicycle spacing=[across footpath of the bridge/(there is interval positive direction in normal strain
The interval twice that the spacing of interval starting point occurs to normal strain of first curve)] spacing between × curve interval described in two.
Wherein, in order to improve the accuracy of above-mentioned measuring method, the above method should preferentially be applied and be in bridge structure form
On the bridge of beam bridge, and the bridge should meet：Bridge maximum strain under fleet's gross weight effect MmaxIt is the maximal bending moment of the bridge strain testing section under vehicle effect, ymaxIt is Edge Distance neutral axis
Maximum height, IE is the bending rigidity in strain testing section.Dynamic strain sensor is high-resolution strain detection testing device, its resolution
Rate is less than 0.1 μ ε.Wherein, processing unit carries out amplitude limit Glitch Filter treatment to strain signal, and by finite element stimulation
Dynamic strain result shape dynamic strain time-history curves are extracted in theoretical dynamic strain, and set up corresponding two-dimensional coordinate system.
In following further illustrating, dynamic strain sensor, dynamic strain sensor are arranged specifically at the across footpath of bridge 1/2
High speed acquisition device and processing unit are sequentially connected by shielded cable, processing unit is the computer to bridge monitoring.It is related to
Bridge parameter is usedThat is εmax=5；The bridge being related to is satisfied by with vehicle：Span of bridge L and fleet's car
Front and rear minimum spacing l：Dynamic strain sensor is that resolution ratio is equal to 0.05 μ ε；Principle and illustration are carried out with this.
In order to further appreciate that such scheme operation principle, said here by simply supported beam strain time history curvilinear function
It is bright.
The strain time history curve after simply supported beam noise reduction filtering under single Concentrated load is represented by：
Wherein, t is the time, and L is that simply supported beam calculates across footpath, and v is speed, and measuring point sensor is with the distance of place cross-sectional neutral axis
Y, E are simply supported beam elastic modelling quantity, and I is simply supported beam cross sectional moment of inertia.
Above formula derivation is obtained：
Formula (2) is normal function discontinuous function, and continuation has to its derivation：
Make formula (1) respectively, formula (2), formula (3) functional arrangement as Figure 1-3, the peak point pair of strain curve as shown in Figure 1
Answer be load P by section where dynamic strain Sensor C when, caused strain size, while where measuring point C
Section is also strain time history curve by rising the separation for switching to decline, and the derivative value in corresponding diagram 2 is from the occasion of being changed into negative value.This
Illustrate that the strain variation value at measuring point there occurs mutation, and cause the reason for straining mutation to be that load acts on survey successively
The left and right sides in section where point, according to certain resilient relationship corresponding with power is strained, the size of strain variation value is in certain journey
It is directly proportional with corresponding load on degree, therefore size for the second derivative values shown in Fig. 3 and load P is one by one
It is corresponding.
The expression formula of its single order of function of strain and second order derived function under being acted on for multiple unit concentrated loads, such as following formula
(4), formula (5), shown in formula (6).
Wherein, t is the time, and N is positive integer, i.e. unit load quantity.
Wherein, t is the time, and N is positive integer, i.e. unit load quantity.
Wherein, t is the time, and N is positive integer, i.e. unit load quantity.
It is assumed here that N=4, that is, have 4 loads, load equation is followed successively by ε1(x)、ε2(x)、ε3(x) and ε4(x), then basis
Formula (1) and formula (4) make ε respectively1(x)、ε2(x)、ε3(x) and ε4The single-point load functional arrangement and multi-load functional arrangement of (x), such as Fig. 4
Shown in upper part.
The corresponding complete strain of each load p as seen from Figure 4 influences line curve, with ε1As a example by (x), it
Represent load P1It is to enter bridge at origin x=0, in time x=d3Place goes out bridge, corresponding d3For actual bridge calculates across footpath L.This
When under multi-load survey strain time history curve total length be (d1+d2+d3), the total size of actual measurement strain stress (x) is (ε1
(x)+ε2(x)+ε3(x)+ε4(x)).It is speed that time change x=vt, v are to x, just obtains total strain time history curve map as schemed
Shown in 4 times parts.Corresponding car during strain variation value mutation is just obtained to the actual measurement overall strain secondary derivation of time-history curves function again
The load factor curve of magnitude of load, as shown in Figure 6.Here it is worth noting that lead value for strain time history curve second order being
Timing is that measuring point strain value starts to become big at span centre or maximum strain reaction caused when load enters bridge or goes out bridge, negative value correspondence
Be then load by measuring point when the strain that causes start to diminish.
Strain time history curve second derivative values during for load by measuring point C are in extremely short time Δ t for one is constant
Constant, that is, form the curve interval determined in load factor curve, and curve interval respective amplitude is unit load by measuring point
When time-history curves second derivative values.In actual detection, there are different noise jamming in dynamic strain sensor, treatment is single
Unit can determine that curve corresponding with the bicycle of fleet is interval on load factor curve according to load factor curve and amplitude threshold,
And the interval amplitude size of the curve is calculated, amplitude threshold is the load that measurable minimum tonnage is determined by the bridge
Minimum amplitude value in negative direction in coefficient curve.Amplitude threshold is used to eliminate the noise effect.
Therefore, in actual measurement, dynamic strain sensor is arranged on the bridge for meeting above-mentioned bridge parameter request
Afterwards, strain signal is detected to dynamic strain sensor by high speed acquisition device to gather and be sent in processing unit.Processing unit
Amplitude limit Glitch Filter treatment is carried out to strain signal, dynamic strain time-history curves are obtained, to that dynamic strain time-history curves and should set up
Corresponding two-dimensional coordinate system.Processing unit extracts and obtains the continuous normal strain of dynamic strain time-history curves and occur interval, and align should
The dynamic strain time-history curves that change occurs in interval carry out second order derivation treatment and obtain load factor curve.Here two-dimensional coordinate system
Origin or abscissa by the bridge without car by when generation dynamic strain time-history curves determine；Normal strain occurs interval can ensure this
Bridge has car to pass through.
Processing unit determines that by the vehicle number of the fleet of bridge be the curve according to load factor curve and amplitude threshold
Interval number.Amplitude threshold is its correspondence load system when meeting the minimum single-point load of bridge survey demand to pass through the bridge
The interval amplitude size of the corresponding curve of minimum single-point load in number curve, beParameter physical significance with it is foregoing
It is identical.Here minimum single-point load should be met in MmaxWhen taking minimum value, it is the magnitude of load that bridge is subject to.
The weight size of bicycle load in fleet, or bicycle car weight can be obtained by formula (7)：
Wherein for N is vehicle fleet size in positive integer, i.e. fleet, GVW is fleet's gross weight.
Specifically, processing unit is determined by the way that in the fleet of the bridge, fleet's bicycle car weight is according to load factor curve
=(the corresponding amplitude size sum of all bicycles of the corresponding amplitude size/fleet of bicycle of fleet) × fleet's gross weight；It is described
There is the area × constant coefficient of dynamic strain time-history curves envelope in interval for normal strain in fleet's gross weight.Constant coefficient=standard tonnage
Vehicle car weight/(there is dynamic strain time-history curves envelope in interval in the normal strain that the vehicle of standard tonnage is obtained by the bridge
Area).
Here the vehicle of standard tonnage is constituted using 10 tons, 20 tons, 30 tons, 40 tons etc. many vehicles of any combination
Fleet there is the area of dynamic strain time-history curves envelope in interval with the normal strain that is at the uniform velocity obtained by the bridge.
The average speed of the fleet can be obtained by formula (8)：
L is that bridge calculates across footpath, t1For vehicle from the time into bridge to arrival measuring point.
Specifically, processing unit is determined by the way that in the fleet of the bridge, speed is the bridge span according to load factor curve
The interval twice that the spacing of interval starting point occurs to normal strain of first curve of negative direction of degree/normal strain generating region.
Fleet's bicycle spacing can be obtained by formula (9)：
Δ d=v (tn-tn-1)=v Δ t formulas (9)；
V is speed, and Δ t is time interval of the bicycle by measuring point.
Specifically, processing unit is determined by the fleet of the bridge according to load factor curve, bicycle spacing=[described
The across footpath of bridge/(first curve of positive direction of normal strain generating region is interval to there is the spacing of interval starting point to normal strain
Twice)] × two curves interval between spacing.
It is further illustrated with actual tests below.
Take many dollies of same car weight first, here by taking 20 tons of model (4.6kg) cars composition fleet as an example, take 20T-
20Hz simply supported beams span centre strains AI01 (left side) and AI02 (the right), and two click through the identification of scanning frequency degree, and identification is divided into 3 grades,
20km/h (0.29m/s), 40km/h (0.56m/s), and 60km/h (0.83m/s).
In Fig. 7, transverse axis represents the time, and sample frequency is 20Hz, is 0.05 second per small lattice time interval, and wherein AI01 lines are being just
Strain value is 127 lattice, and the time of passing a bridge is 127 × 0.05=6.35 seconds；AI02 lines normal strain be 128 lattice, pass a bridge the time be 128 ×
0.05=6.4 seconds.
Relative error
| 20t-20Hz | Time s | Recognition speed m/s | Relative error % |
| 20km/h | 6.4 | 0.315 | 7.5 |
| 40km/h | 3.3 | 0.606 | 7.6 |
| 60km/h | 2.3 | 0.869 | 4.7 |
As shown in figure 8, trying to achieve 3 20t car weights (ε-vt) using related software surrounds area for 232.38m × ε, constant coefficient
It is 232.38/13.8=16.84.
The identification of car weight now divides four grades in terms of the area of strain time history curve and reference axis envelope with car weight identification,
20t (4.6kg), 40t (8.85kg), 60t (13.42kg) and 80t (17.9kg), wherein 20t are standard heavy duty, 40t, 60t,
80t is identification heavy duty.
| Fleet's gross weight | Area m × ε | Identification car weight kg | Relative % by mistake |
| 20t(4.6kg)×3 | 232.38 | 13.8 | 0 |
| 40t(8.85kg)×3 | 445.95 | 26.48 | 0.3 |
| 60t(13.42kg)×3 | 704.16 | 41.81 | 3.8 |
| 80t(17.9kg)×3 | 910.95 | 54.09 | 0.7 |
As seen from the above table, can to obtain fleet with the area that reference axis is surrounded by constant coefficient and strain time history curve total
Weight, its error can be in prescribed limit.
As shown in figure 9, with multiple same fleet's gross weights, different speeds carry out bicycle spacing identification.Now with 20t-20Hz,
Fleet's bicycle spacing is 18cm, and speed is respectively 20km/h (0.29m/s), 40km/h (0.56m/s), and 60km/h (0.83m/
S) identification of bicycle spacing in fleet is carried out respectively.
With same bicycle spacing as 18cm, 2 × 20t of same fleet's gross weight (4.6kg), same speed 20km/h (0.29m/
S) as a example by.Figure 10 is dolly with 20km/h, the strain time history curve map extracted when sample frequency is by 20Hz, if according to step-length
Be 0.05s (i.e. former sample frequency) to time-history curves derivation function, because in original timeamplitude map there is upper and lower ripple in each point
Dynamic situation, the result of gained is very big by curve influence of noise, such as Figure 10 marks；Therefore can cause second derived function also on
Lower fluctuation, recognition result is difficult to produce a desired effect.Here the recognition result for meeting, width can be filtered out by setting amplitude threshold
It is most small size in negative direction in the load factor curve that degree threshold size is measurable minimum tonnage to be determined by the bridge
Angle value.As shown in Figure 10, meet only two of curve section definition, mark 1, mark 2, this is consistent with actual vehicle number.
Obtained according to formula (7)：
To the error of bicycle car weight 1.24%, receiving in error range.It can be seen that, under such scheme, can measure
Fleet's bicycle car weight is obtained, the need for meeting bridge survey.
Described above is directed to the detailed description of preferably possible embodiments of the invention, but embodiment is not limited to this hair
Bright patent claim, the equal change completed under the technical spirit suggested by all present invention or modification change, all should belong to
Cover the scope of the claims in the present invention.
Claims (5)
1. the method that fleet's bicycle spacing is recognized based on bridge dynamic strain, it is characterised in that the bridge structure form is beam type
Bridge, minimum spacing l need to meet relational expression before and after beam bridge calculates across footpath L and fleet vehiclePass through in many vehicle fleets
It is to fleet's bicycle distance measurement step during bridge：The dynamic strain sensor is being set on section and along longitudinal cloth of bridge
Put；The dynamic strain sensor is sequentially connected high speed acquisition device and processing unit by shielded cable；The high speed acquisition device pair
The strain signal of dynamic strain sensor is acquired and is sent in processing unit；The processing unit is filtered to strain signal
Ripple is processed and obtains dynamic strain time-history curves, and the continuous normal strain that extraction obtains dynamic strain time-history curves occurs interval, and aligns
The dynamic strain time-history curves that strain occurs in interval carry out second order derivation treatment and obtain load factor curve；The processing unit root
It is interval that curve corresponding with the bicycle in fleet on load factor curve is determined and extracted according to load factor curve and amplitude threshold,
Calculate the interval amplitude size of the curve；The amplitude threshold is that the minimum single-point load for meeting bridge survey demand passes through the bridge
Liang Shi, the interval amplitude size of the corresponding curve of minimum single-point load in its correspondence load factor curve；The curve is interval to be met
Its amplitude size is not less than amplitude threshold size；The fleet's bicycle spacing=[across footpath of the bridge/(normal strain generating region
Between the interval twice that the spacing of interval starting point occurs to normal strain of first curve of positive direction)] × curve described in two is interval
Between spacing.
2. the method based on bridge dynamic strain identification fleet bicycle spacing according to claim 1, it is characterised in that：It is described
Dynamic strain time-history curves, by finite element stimulation theory dynamic strain, and are extracted dynamic strain result and are formed by processing unit.
3. the method based on bridge dynamic strain identification fleet bicycle spacing according to claim 1, it is characterised in that：It is described
Bridge maximum strain under fleet's gross weight effectNeed to meetMmaxFor under vehicle effect
The maximal bending moment of bridge strain testing section, ymaxIt is the maximum height of Edge Distance neutral axis, IE is anti-for strain testing section
Curved rigidity.
4. the method based on bridge dynamic strain identification fleet bicycle spacing according to claim 1, it is characterised in that：It is described
Dynamic strain sensor is high-resolution strain detection testing device, and its resolution ratio is less than 0.1 μ ε.
5. the method based on bridge dynamic strain identification fleet bicycle spacing according to claim 1, it is characterised in that：It is described
Filtering method is amplitude limit Glitch Filter.
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| CN115876412A (en) * | 2022-12-15 | 2023-03-31 | 广西北投交通养护科技集团有限公司 | Fabricated beam bridge health state assessment method based on strain gauges |
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