CN104809314B - Highway bridge bearing and the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of retractor device - Google Patents
Highway bridge bearing and the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of retractor device Download PDFInfo
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Abstract
The invention discloses a kind of highway bridge bearing and the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of retractor device, including：Vibrating data collection module, the longitudinal acceleration response signal for gathering retractor device or beam body；Longitudinal anti-impact Evaluation model, defines longitudinal shock resistance grade assessment method and longitudinal shock resistance deterioration rate computational methods；Longitudinal anti-impact deteriorates database, store the longitudinal shock resistance military service performance test results of each detection cycle and deterioration evaluation result, the change of tracking and monitoring longitudinal direction shock resistance military service performance degradation rate, then can early diagnose and recognize the deterioration and damage of longitudinal shock resistance duty status.The inventive method improves the reliability for checking evaluation while detection efficiency is improved.
Description
Technical field
The invention belongs to highway bridge detection field, the shock resistance for being related to a kind of highway bridge bearing and retractor device is on active service
Reliable Evaluating Methods of Their Performance.
Background technology
Highway bridge bearing and retractor device are the important structures in highway bridge, usually require that maintenance department enters to it
Line period is checked, and carries out condition state according to inspection result.
Under service conditions, unavoidably there is some deteriorations or disease in highway bridge, stretch dress with the extension of service phase
Put deterioration and be mainly shown as expansion joint relative dislocation；At dislocation expansion joint with that under driving coupling excitation, driving and beam body can be caused to shake
Dynamic response；If dislocation difference is excessive, traffic safety was both influenceed or had influenceed the safety and durability of bridge structure.
For a long time, highway bridge bearing and retractor device are inspected periodically, and mainly using the method for hand inspection, are deposited
In problems with：1st, detection content is quantified in the scope of examination qualitative examination content few more；2nd, check that labor intensity is big, work high above the ground
And working space is small；3rd, check that efficiency is low and detection quality is unstable, early disease recall rate is low by 4, artificial detection when can influence
Road surface running vehicle and manual record detection content owe specification, intact.
Accordingly, it would be desirable to which a kind of new highway bridge bearing and retractor device military service performance checking assessment method, lifting are checked
The reliability and efficiency of evaluation.
The content of the invention
Technical problem：Present invention aims at a kind of efficiency and reliability for lifting the evaluation of disease early detection is provided, make
The longitudinal shock resistance military service assessment of performance side of highway bridge bearing and retractor device for the important supplement of conventional manual's detection means
Method.
Technical scheme：The longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of highway bridge bearing and retractor device of the present invention, bag
Include following steps：
S1：Obtain the particulars for being assessed object：
Collect the essential information, all previous maintenance or the maintenance report that are assessed object, detection initial value, all previous longitudinal impact resistance
Can detected value and assessment result；
S2：The longitudinal shock resistance of detection in real time, calculates longitudinal acceleration peak value of response, repeatedly, it is determined that longitudinal direction punching
Peakvalue's checking average is hit, and then determines to be assessed longitudinal shock resistance J of objectXAnd divide longitudinal shock resistance evaluation etc.
Level；
S3：According to the longitudinal shock resistance measured value for being assessed object, whether judgement is assessed object from depth inspection
Look into：If evaluating longitudinal shock resistance J of objectX>0.5, then from depth inspection, and enter S5 steps, otherwise into S4
Step；
S4：The longitudinal shock resistance evaluation obtained according to highway bridge and culvert Maintenance specification _ JTG_H11-2004 and step S2
Grade, for retractor device, carries out depth inspection, particular content is to being assessed object：The integrity checking of retractor device, connect
The relative dislocation inspection of seam, the status checkout of bearing, the inspection of driving noise and vibration, anchoring integrity checking, the ladder of seam
Difference is checked；Complete depth check after, terminate this method step flow；
S5：It is bad that longitudinal shock resistance measured value and detection initial value according to object is assessed calculate longitudinal shock resistance
Rate.
Further, step S2 idiographic flow is in the inventive method：
According to formula vTest=0.95 × vmaxIt is determined that detection speed per hour vTest, v in formulamaxTo be assessed the design speed limit of object；
Car is detected to detect speed per hour vTestBy being assessed during object, the longitudinal acceleration response of collection retractor device in real time
Curve, measures impact of collision peak value gXp, repeatedly above-mentioned detection, the detection average of the above-mentioned impact of collision peak value of calculating determination
Longitudinal shock resistance J is finally calculated as followsX：
In formula, G is acceleration of gravity, and unit is m/s2；gXpFor impact of collision peak value, unit is m/s2；μ is to be assessed bridge
The design impact coefficient value of beam, according to the regulation of highway bridge and culvert universal design specification JTG D60-2004 4.3.2 bars, value
Scope is 0.05~0.45；gLimtFor acceleration responsive permissible value, and there is gLimt=G × μ, unit is m/s2；
Longitudinal shock resistance evaluation is divided into five levels：Excellent, good, qualified, poor, disease；
Work as JXWhen >=0.90, the longitudinal shock resistance of evaluation is excellent, shows driving smooth-going and entirely without sense of jolting；
When 0.9>JXWhen >=0.75, the longitudinal shock resistance of evaluation is good, shows driving smooth-going but have slightly to jolt；
When 0.75>JXWhen >=0.50, the longitudinal shock resistance of evaluation is qualified, shows driving smooth-going but jolts；
When 0.50>JXWhen >=0.10, the longitudinal shock resistance of evaluation is poor, shows that driving has impact to feel；
Work as JX<When 0.10, the longitudinal shock resistance disease of evaluation shows that driving has jump car sense or jumps car phenomenon.
Further, in the step S5 of the inventive method, longitudinal shock resistance deterioration rate D is calculated according to following formulaJXn：
In formula, JX1Initial value is detected for longitudinal shock resistance, for the first time after being assessed the newly-built completion of object or repairing
Detected value；JXnFor longitudinal shock resistance currency；Detected for the n-th detection cycle after being assessed the newly-built completion of object or repairing
Value.
Further, in the inventive method, step S6 is also included after step S5：Generate resisting longitudinal impact military service performance inspection
Announcement is observed and predicted, particular content is：Bridge type and pile No., retractor device type, runway numbering, detection time, detection cycle, when
Preceding temperature, flexible gap width, detection speed per hour, measured curve, longitudinal shock resistance detected value, longitudinal shock resistance deterioration
Rate, military service technology evaluation result.
Further, in the inventive method, step S7 is also included after step S6：Longitudinal direction anti-impact deterioration database is enriched,
Following record is added in longitudinal anti-impact deterioration database；Detection time, detection cycle, detection temperature, detection speed per hour, actual measurement are bent
Line, longitudinal shock resistance detected value, longitudinal shock resistance deterioration rate, live depth inspection result, assessment result and suggestion.
In the present invention, by vibrating data collection module and longitudinal shock resistance assessment analysis Integrated Simulation, highway bridge is installed on
At beam support and retractor device, when running vehicle by measurand, in real time, automatic identification and its longitudinal impact resistance is recorded
Energy；According to the essential information and history shock resistance information of highway bridge bearing and retractor device, highway bridge bearing is calculated
And the deterioration rate of retractor device, and longitudinal shock resistance level of auto judge highway bridge bearing and retractor device；Not
Influence highway bridge is normally open to traffic under conditions of operation, greatly improves conventional manual and checks efficiency, saves testing cost and time.
Beneficial effect：The present invention compared with prior art, with advantages below：
In the inventive method, when driving passes through expansion joint, under driving excitation, retractor device impact of collision is caused to ring
Should；The step difference of height and longitudinal supporting rigidity at above-mentioned shock response and expansion joint are closely related；According to measured impact of collision peak
Value determines longitudinal shock resistance；According to longitudinal shock resistance measured value and detection initial value, it is determined that longitudinal shock resistance is bad
Rate；Above-mentioned detection initial value is stored in deterioration process database；Longitudinal shock resistance and longitudinal shock resistance using quantization
Performance degradation rate detected value, can quantitatively evaluate the resisting longitudinal impact military service performance of Expansion Units for Highway Bridges and bearing, long
The change of phase tracking observation longitudinal direction shock resistance deterioration rate, then can early diagnose and be assessed the impact of object resisting longitudinal with identification
The deterioration and damage of military service performance.Relative to routine inspection it is generally necessary to close runway and using the side of a large amount of human resources
Method, the present invention by vibrating data collection module and longitudinal shock resistance assessment analysis Integrated Simulation, be installed on tested highway bridge and stretch
At compression apparatus and bearing, when running vehicle by measurand, real-time, automatic identification is carried out to its shock resistance and is sentenced
It is disconnected；Run and while improve detection efficiency not influenceing highway bridge to be normally open to traffic, improve Expansion Units for Highway Bridges and
The identity of the earlier damage of bearing duty status and the quality for checking evaluation.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the inventive method
Fig. 2 is variator impact of collision vibration schematic diagram
Fig. 3 is longitudinal shock resistance deterioration rate course curve
Have in figure：
1 beam body
2 anchorage zones
3 retractor device anchoring pieces
4 expansion joint profile irons
5 sealing rubber strips
6 rubber supports
7 pier caps
Gx impact of collision acceleration.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Currently used Expansion Units for Highway Bridges and support system technology status check assessment method, it is impossible to realize flexible
The automatic evaluation of device and bearing duty status, it is impossible to automatically generate long-term follow and assess database, it is impossible to realize earlier damage
And the automatic identification of deterioration.
For problems of the prior art, propose that a kind of highway bridge bearing and retractor device are longitudinally anti-in the present invention
Impact military service Reliable Evaluating Methods of Their Performance, it is adaptable to service Highway Bridge Testing retractor device and the detection of support system duty status；
Response data acquisition module automatic data collection of driving a vehicle acceleration-time graph, computing obtains acceleration peak value；According to evaluation mould
Type determines that runability is classified with evaluation in real time；Initial value and current runability measured value are detected according to runability, it is determined that being assessed object
Traveling deterioration rate；While detection efficiency is improved, the early stage of highway bridge bearing and retractor device duty status is improved
The identity of damage and the quality for checking evaluation.The change of tracking observation longitudinal direction shock resistance deterioration rate, then can examine in early days
It is disconnected to be assessed deterioration and damage that object resisting longitudinal impacts military service performance with identification, while detection efficiency is improved, improve
The identity of Expansion Units for Highway Bridges and the earlier damage of bearing duty status and the quality for checking evaluation.
As shown in figure 1, the inventive method step is as follows：
S1：Obtain the particulars for being assessed object
Collect the data in detailed below for being assessed retractor device：
Bridge type, design impact coefficient, retractor device type, type of support, runway numbering, to be assessed bridge all previous
Maintenance and maintenance report, currently known disease qualitative information and disease quantitative information；
Collect the following performance data for being assessed retractor device：
Design stroke, current stroke, Current Temperatures, the speed limit for being assessed bridge, all previous detection temperature, all previous longitudinal direction
Shock resistance detected value and assessment result；
S2：Determine the longitudinal shock resistance for being assessed object
The longitudinal shock resistance of detection in real time, calculates longitudinal acceleration peak value of response, repeatedly, determines impact of collision peak
Value detection average, and then determine to be assessed longitudinal shock resistance J of objectX；
Drive a vehicle to detect speed per hour vTestBy the longitudinal acceleration-time for being assessed object, collection retractor device or beam body
Curve, sample frequency is not less than 1000Hz, and the sampling time is not less than 4 seconds, and impact of collision peak value g is calculated in real timeXp；
The n above-mentioned detecting step of detection is repeated, then impact of collision peakvalue's checking average is determined by following formula：
Longitudinal shock resistance detected value is determined by following formula：
S3：Judge whether from depth inspection
If longitudinal shock resistance detected value is less than 0.5, longitudinal shock resistance difference or longitudinal shock resistance are evaluated
Disease, performs S4 steps, and depth inspection is carried out to being assessed object；Otherwise, S5 steps are directly performed, it is determined that longitudinal impact resistance
Rate can be deteriorated and resisting longitudinal impact military service performance detection report is generated；
S4：Carry out depth inspection, after the completion of i.e. terminate the inventive method flow.
The live depth checks that main contents are：The integrity inspection of retractor device, the relative dislocation and step of seam
Poor inspection, the status checkout of bearing, the inspection of driving noise and vibration, the inspection of anchoring integrity, the step difference inspection of seam, bearing
State of the art and disease inspection, including qualitatively and quantitatively check；
Above-mentioned quantitative check includes：Variator step difference measurements, the integrity of retractor device anchorage zone and crack detection,
Retractor device slit width gap width is measured with uniformity measurement, expansion joint twisting with gyration；
Above-mentioned qualitative examination includes：Disease inspection includes：Damage Types, position and the degree of retractor device, retractor device
Entirety and disease photo, Bearing Seat Force state and disease photo；
S5：Calculate longitudinal shock resistance deterioration rate
Longitudinal shock resistance deterioration rate is calculated as follows：
In formula,
JX1Initial value is detected for longitudinal shock resistance, for the first time detection after being assessed the newly-built completion of object or repairing
Value；
JXnFor longitudinal shock resistance currency；Detected for the n-th detection cycle after being assessed the newly-built completion of object or repairing
Value；
Generally each detection cycle is usually 3 months, most childlike in 12 months.
In the preferred embodiments of the present invention, step S6 can also be included：Generate resisting longitudinal impact military service performance detection report.
Resisting longitudinal impact military service performance detection report includes following main contents：
Bridge type and pile No., retractor device type, runway numbering, detection time, detection cycle, Current Temperatures, stretch
Contracting gap width, detection speed per hour, measured curve, longitudinal shock resistance detected value, longitudinal shock resistance deterioration rate, military service skill
Art assessment result；
Testing staff can input depth inspection result and suggestion.
In the preferred embodiments of the present invention, step S7 can also be included：Enrich longitudinal direction anti-impact deterioration database.
Following record is added in longitudinal anti-impact deterioration database；
It is detection time, detection cycle, detection temperature, detection speed per hour, measured curve, longitudinal shock resistance detected value, vertical
To shock resistance deterioration rate, live depth inspection result, assessment result and suggestion；
Embodiment
The present embodiment only illustrates a kind of concrete condition that the present invention is implemented, and does not limit other performances of the present invention.
By taking certain highway bridge as an example, the Expansion Units for Highway Bridges technology based on longitudinal shock resistance according to the present invention
Status assessment method, completes its military service assessment of performance, comprises the following steps that：
S1：Obtain the particulars for being assessed object
The object highway bridge is assessed for prestressed concrete box-beam bridge, time of completion is in June, 2012, retractor device
For deformed steel list seam retractor device, design stroke is 60mm, current detection environment temperature 10, DEG C current retractor device
10mm slit widths, speed limit are 120 km/h, detection cycle is 6 months, and this is detected as the 6th time, longitudinal shock resistance detection
Initial value JX1=0.99, impact coefficient design value μ=1.35 of bridge, no maintenance and maintenance record are assessed, all previous longitudinal direction resists
Impact property detected value is shown in Fig. 3 with assessment result；
S2：Determine the longitudinal shock resistance for being assessed object
Determine that Evaluation model uses following technical parameter according to above-mentioned particulars：Longitudinal acceleration sensor, which is arranged on, to be stretched
On the track profile iron of compression apparatus girder the 3rd, resisting longitudinal impact energy detection initial value takes JX1=0.99, it is assessed the impact coefficient of bridge
Design value μ=0.35, detection speed per hour takes 115km/h；Detection car above-mentioned is assessed object, continuous acquisition to detect that speed per hour is driven into
Longitudinal acceleration response curve, sample frequency is 1000Hz, and collecting sample is 4096, is repeated three times；
Determine for the first time, measure impact of collision peak value for gXp 1=0.462m/s2,
Second of measure, measures impact of collision peak value for gXp 2=0.17m/s2,
Third time is determined, and measures impact of collision peak value for gXp 3=0.401m/s2；
Calculating impact of collision peak average value is
Calculating the longitudinal shock resistance detected value in the 3rd track is
S3：Judge whether from depth inspection
The longitudinal shock resistance detected value of actual measurement is JX=0.876>0.75, evaluation result is that longitudinal shock resistance is poor,
Then from depth inspection, S5 steps are performed；
S5：Calculate longitudinal shock resistance deterioration rate
Known longitudinal shock resistance detection initial value is JX1=0.99, this is detected as the 6th detection cycle, longitudinal shock resistance
Performance detection value is JX6=0.876；Calculating longitudinal shock resistance deterioration rate is
S6：Generate resisting longitudinal impact military service performance detection report
Above-mentioned resisting longitudinal impact military service performance detection report main contents include：
Detection time：On January 28th, 2015, detection environment temperature：10 degree, bridge type：Prestressed concrete box-beam bridge,
Retractor device type：Deformed steel list seam retractor device, the slit width 10mm of retractor device, detection road speed 115km/h；
Longitudinal shock resistance detected value JX=0.876, longitudinal shock resistance deterioration rate DJX6=11.57%, evaluation knot
Fruit is good for longitudinal shock resistance, driving smooth-going；
Conclusions and recommendations：Bridge extension joint and support system shock resistance history are assessed according to the detection of this detection method
Information is shown in Fig. 3, and longitudinal shock resistance deterioration rate is 11.57%, and evaluation result is the functional driving of resisting longitudinal impact military service
Smooth-going；
S7：Enrich longitudinal direction anti-impact deterioration database
Herein below is added in longitudinal anti-impact deterioration database:
Detection time：January 28, environment temperature in 2015：10 degree, detection speed per hour：115km/h, longitudinal acceleration-time
Measured curve, longitudinal shock resistance detected value：0.876th, longitudinal shock resistance deterioration rate：11.57%, evaluation result is vertical
It is good to shock resistance, driving smooth-going.
Above-described embodiment is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill of the art
For personnel, under the premise without departing from the principles of the invention, some improvement and equivalent substitution can also be made, these are to the present invention
Claim be improved with the technical scheme after equivalent substitution, each fall within protection scope of the present invention.
Claims (4)
1. a kind of highway bridge bearing and the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of retractor device, it is characterised in that this method
Comprise the following steps：
S1：Obtain the particulars for being assessed object：
Collect the essential information, all previous maintenance or the maintenance report that are assessed object, detection initial value, all previous longitudinal shock resistance inspection
Measured value and assessment result；
S2：The longitudinal shock resistance of detection in real time, calculates longitudinal acceleration peak value of response, repeatedly, determines impact of collision peak
Value detection average, and then determine to be assessed longitudinal shock resistance J of objectXAnd divide longitudinal shock resistance rating,
Idiographic flow is：
According to formula vTest=0.95 × vmaxIt is determined that detection speed per hour vTest, v in formulamaxTo be assessed the design speed limit of object；
Car is detected to detect speed per hour vTestBy being assessed during object, the longitudinal acceleration response curve of retractor device is gathered in real time,
Measure impact of collision peak valueRepeatedly above-mentioned detection, calculates the detection average for determining above-mentioned impact of collision peak value
Longitudinal shock resistance J is finally calculated as followsX：
<mrow>
<msub>
<mi>J</mi>
<mi>X</mi>
</msub>
<mo>=</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
<msub>
<mover>
<mi>g</mi>
<mo>&OverBar;</mo>
</mover>
<mrow>
<mi>X</mi>
<mi>p</mi>
</mrow>
</msub>
<mrow>
<mi>G</mi>
<mo>&times;</mo>
<mi>&mu;</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
In formula, G is acceleration of gravity, and unit is m/s2；For impact of collision peak value, unit is m/s2；μ is to be assessed bridge
Impact coefficient value is designed, according to the regulation of highway bridge and culvert universal design specification JTG D60-2004 4.3.2 bars, span
For 0.05~0.45；
Longitudinal shock resistance evaluation is divided into five levels：Excellent, good, qualified, poor, disease：
Work as JXWhen >=0.90, the longitudinal shock resistance of evaluation is excellent, shows driving smooth-going and entirely without sense of jolting；
When 0.9>JXWhen >=0.75, the longitudinal shock resistance of evaluation is good, shows driving smooth-going but have slightly to jolt；
When 0.75>JXWhen >=0.50, the longitudinal shock resistance of evaluation is qualified, shows driving smooth-going but jolts；
When 0.50>JXWhen >=0.10, the longitudinal shock resistance of evaluation is poor, shows that driving has impact to feel；
Work as JX<When 0.10, the longitudinal shock resistance disease of evaluation shows that driving has jump car sense or jumps car phenomenon；
S3：According to the longitudinal shock resistance measured value for being assessed object, whether judgement is assessed object from depth inspection：If
Evaluate longitudinal shock resistance J of objectX>0.5, then from depth inspection, and enter S5 steps；Otherwise enter S4 to walk；
S4：The longitudinal shock resistance evaluation obtained according to highway bridge and culvert Maintenance specification _ JTG_H11-2004 and step S2
Grade, for retractor device, carries out depth inspection, particular content is to being assessed object：The integrity checking of retractor device, connect
The relative dislocation inspection of seam, the status checkout of bearing, the ladder of drive a vehicle noise and vibration inspection, anchoring integrity checking and seam
Difference is checked；Complete depth check after, terminate this method step flow；
S5：Longitudinal shock resistance measured value and detection initial value according to object is assessed calculate longitudinal shock resistance deterioration
Rate.
2. the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of a kind of highway bridge bearing and retractor device as claimed in claim 1,
Characterized in that, in the step S5, longitudinal shock resistance deterioration rate D is calculated according to following formulaJXn：
<mrow>
<msub>
<mi>D</mi>
<mrow>
<mi>J</mi>
<mi>X</mi>
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>J</mi>
<mrow>
<mi>X</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>J</mi>
<mrow>
<mi>X</mi>
<mi>n</mi>
</mrow>
</msub>
</mrow>
<msub>
<mi>J</mi>
<mrow>
<mi>X</mi>
<mn>1</mn>
</mrow>
</msub>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mo>;</mo>
</mrow>
In formula, JX1Initial value is detected for longitudinal shock resistance, for the first time detection after being assessed the newly-built completion of object or repairing
Value；JXnFor longitudinal shock resistance currency；For the n-th detection cycle detected value after being assessed the newly-built completion of object or repairing.
3. the longitudinal shock resistance military service assessment of performance side of a kind of highway bridge bearing and retractor device as claimed in claim 1 or 2
Method, it is characterised in that also include step S6 after the step S5：Resisting longitudinal impact military service performance detection report is generated, specifically
Content is：Bridge type and pile No., retractor device type, runway numbering, detection time, detection cycle, Current Temperatures, stretch
Gap width, detection speed per hour, measured curve, longitudinal shock resistance detected value, longitudinal shock resistance deterioration rate and military service skill
Art assessment result.
4. the longitudinal shock resistance military service Reliable Evaluating Methods of Their Performance of a kind of highway bridge bearing and retractor device as claimed in claim 3,
Characterized in that, also including step S7 after the step S6：Longitudinal direction anti-impact deterioration database is enriched, number is deteriorated in longitudinal anti-impact
According to record below being added in storehouse：Detection time, detection cycle, detection temperature, detection speed per hour, measured curve, longitudinal impact resistance
Energy detected value, longitudinal shock resistance deterioration rate, live depth inspection result and assessment result and suggestion.
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| CN104195961A (en) * | 2014-09-02 | 2014-12-10 | 司徒毅 | Highway bridge technical condition examination and evaluation method |
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| CN104195961A (en) * | 2014-09-02 | 2014-12-10 | 司徒毅 | Highway bridge technical condition examination and evaluation method |
| CN104268670A (en) * | 2014-09-02 | 2015-01-07 | 司徒毅 | Highway bridge technical condition examination and evaluation system |
| CN104504769A (en) * | 2014-12-03 | 2015-04-08 | 上海市政工程设计研究总院（集团）有限公司 | Electronic disease collection system for rail transit bridge and tunnel structure and collection and analysis method |
| CN104850678A (en) * | 2015-03-18 | 2015-08-19 | 黄跃平 | Vehicle travelling performance-based method for evaluating travelling service performance of highway bridge expansion device |
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