Summary of the invention
The present invention provides the safe early warning method and system of a kind of bridge, is capable of more acurrate, more direct reaction bridgeDynamic response and dynamic rate can preferably assess the health status of operation bridge, find bridge defect accurately and in time.
One aspect of the present invention provides a kind of safe early warning method of bridge, comprising:
S11, crucial section acquires dynamic deflection initial data, dynamic deflection original number described in every group each of on bridge main beamAccording to including carload effect value, temperature load effect value and influence of noise value；
S12, using Via Nonlinear Principal Component Analysis-algorithm of support vector machine by the temperature in dynamic deflection initial data described in every groupLoad effect value and influence of noise value obtain dynamic deflection correction value after rejecting；Dynamic deflection correction value described in every group only includes automobile lotusCarry effect value；
S13, the dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determines the health of the bridgeState；The two-stage system pre-alarming system includes level-one early warning value and second level early warning value, and the second level early warning value is greater than described oneGrade early warning value.
A kind of safe early warning method of bridge provided in an embodiment of the present invention is by rejecting the dynamic of each crucial section acquisitionTemperature load effect value and influence of noise value in amount of deflection initial data obtain the only dynamic deflection including carload effect value and repairPositive value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior art from long term monitoring dataIt is middle analysis bridge deterioration and its damage cause data not in time the problem of, obtain more timely assessment operation bridge healthThe effect of situation；In addition, the dynamic deflection correction value is compared with two-stage system pre-alarming system, it can be more acurrate, more direct anti-Answer the dynamic response and dynamic rate of bridge.
As the improvement of this programme, the key section has N number of；N is integer, and N is greater than or equal to 1；The dynamic deflectionCorrection value and the crucial section correspond.
As the improvement of this programme, the second level pre-alarming system includes level-one early warning value and second level early warning value；The second levelEarly warning value is greater than the level-one early warning value.
As the improvement of this programme, the S13 includes:
When the dynamic deflection correction value in all crucial sections is less than the level-one early warning value, it is determined as normal condition；
When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but it is less than the second level early warning valueWhen, it is determined as level-one alert status；
When the dynamic deflection correction value in any crucial section is greater than the second level early warning value, it is determined as second level alert status.
As the improvement of this programme, the level-one early warning value precalculates to obtain by following steps:
S21, the finite element model for establishing the bridge, and according to the selected crucial section of bridge type；
S22, it is acted on the crucial section with unit load, obtains the deflection line in the crucial section；
S23, the least favorable loading area in the crucial section is obtained according to the deflection line；
S24, lane load is arranged in least favorable loading area, obtain the deflection limit value envelope diagram in crucial section；
S25, the maximum for selecting each crucial section according to the deflection limit value envelope diagram, minimum deflection limit value are as bridgeLevel-one early warning value, the level-one early warning value number are corresponding with the crucial section.
As the improvement of this programme, the second level early warning value uses maximum vertical deflection value as defined in existing industry standard,Select corresponding maximum vertical deflection value as the second level early warning value according to bridge type.
A kind of safe early warning method of bridge provided in an embodiment of the present invention passes through shadow of the unit load on crucial sectionIt rings line and establishes two-stage system pre-alarming system, the health status for obtaining bridge is compared with the dynamic deflection correction value of real-time monitoring, solveThe problem for only monitoring static deflection in the prior art and causing monitoring data not real-time and inaccurate, the method energy of second level early warningThe enough health status for effectively, accurately judging bridge.
A kind of safety pre-warning system of bridge provided by the invention, the system comprises:
System Data Collection Module acquires dynamic deflection initial data for section crucial each of on bridge main beam, oftenThe group dynamic deflection initial data includes carload effect value, temperature load effect value and influence of noise value；
Data processing module, using Via Nonlinear Principal Component Analysis-algorithm of support vector machine by dynamic deflection original number described in every groupAccording to temperature load effect value and influence of noise value reject after obtain dynamic deflection correction value；Dynamic deflection correction value described in every group is only wrappedInclude carload effect value；
Determination module, for comparing the dynamic deflection correction value and preset two-stage system pre-alarming system, described in judgementThe safe condition of bridge；The second level pre-alarming system includes level-one early warning value and second level early warning value, and the second level early warning value is bigIn the level-one early warning value.
A kind of safety pre-warning system of bridge provided in an embodiment of the present invention, passes through the data acquisition module and the numberDynamic deflection correction value is obtained according to processing module, the dynamic deflection correction value and the two-stage system pre-alarming system of the determination module are madeComparison obtains the health status of bridge, and the dynamic that bridge more acurrate, more can be directly reacted by the way of grading forewarning system is rungShould and dynamic rate.
As the improvement of this programme, the key section has N number of；N is integer, and N is greater than or equal to 1；The dynamic deflectionCorrection value and the crucial section correspond.
As the improvement of this programme, the determination module is further used for；
When the dynamic deflection correction value in all crucial sections is less than the level-one early warning value, it is determined as normal condition；
When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but it is less than the second level early warning valueWhen, it is determined as level-one alert status；
When the dynamic deflection correction value in any crucial section is greater than the second level early warning value, it is determined as second level alert status.
As the improvement of this programme, the level-one early warning value precalculates to obtain by following steps: establishing the bridgeFinite element model, and according to the selected crucial section of bridge type；It is acted on the crucial section with unit load, obtains the passThe deflection line in key section；The least favorable loading area in the crucial section is obtained according to the deflection line；LeastSharp loading area arranges lane load, obtains the deflection limit value envelope diagram in crucial section；It is selected according to the deflection limit value envelope diagramLevel-one early warning value of the maximum, minimum deflection limit value in fixed each crucial section as bridge, the level-one early warning value number with it is describedCrucial section is corresponding.
As the improvement of this programme, the second level early warning value uses maximum vertical deflection value as defined in existing industry standard,Select corresponding maximum vertical deflection value as the second level early warning value according to bridge type.
A kind of safety pre-warning system of bridge provided in an embodiment of the present invention is by data acquisition module in a crucial sectionDynamic deflection initial data is acquired, and the temperature load effect value and influence of noise that are affected are rejected by data processing moduleValue obtains dynamic deflection correction value only including carload effect value, solves and only monitor static deflection in the prior art and makeAt the problem that monitoring data are not real-time and inaccurate, the determination module does the dynamic deflection correction value with second level pre-alarming systemComparison, obtains the health status of bridge, more acurrate, more can directly react the dynamic response and dynamic rate of bridge.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every otherEmbodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of flow diagram of the safe early warning method of bridge provided in an embodiment of the present invention, including it is followingStep:
S11, crucial section acquires dynamic deflection initial data, dynamic deflection original number described in every group each of on bridge main beamAccording to including carload effect value, temperature load effect value and influence of noise value；
S12, using Via Nonlinear Principal Component Analysis-algorithm of support vector machine by the temperature in dynamic deflection initial data described in every groupLoad effect value and influence of noise value obtain dynamic deflection correction value after rejecting；Dynamic deflection correction value described in every group only includes automobile lotusCarry effect value；
S13, the dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determines the health of the bridgeState；The two-stage system pre-alarming system includes level-one early warning value and second level early warning value, and the second level early warning value is greater than described oneGrade early warning value.
Wherein, the crucial section has N number of；N is integer, and N is greater than or equal to 1；The dynamic deflection correction value with it is describedCrucial section corresponds.
Wherein, the S13 includes: and sentences when the dynamic deflection correction value in all crucial sections is less than the level-one early warning valueIt is set to normal condition；When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but it is pre- to be less than the second levelWhen alert value, it is determined as level-one alert status；When the dynamic deflection correction value in any crucial section is greater than the second level early warning value, sentenceIt is set to second level alert status.
Specifically, acquiring dynamic deflection initial data, every group of institute on each key section on bridge when there is vehicle to pass throughStating dynamic deflection initial data includes carload effect value, temperature load effect value and influence of noise value；Specifically, the keySection has N number of, and N is integer, and N is greater than or equal to 1；The key section and dynamic deflection correction value correspond.
Specifically, not including the temperature load in the second level pre-alarming system compared with the dynamic deflection correction valueEffect value and influence of noise value, and the influence of the temperature load effect value and influence of noise value to dynamic deflection correction value is comparedGreatly, it is therefore desirable to reject；With the sample data training non-linear member-supporting vector machine model, disjunctive model, the sample are establishedNotebook data is dynamic deflection initial data gathered in advance, and the disjunctive model is used to separate the temperature of the dynamic deflection initial dataLoad effect value and influence of noise value obtain the dynamic deflection correction value；The dynamic deflection initial data acquired each time will be usedThe disjunctive model is separated；Dynamic deflection correction value described in every group only includes carload effect value.
Specifically, the dynamic deflection correction value is compared with two-stage system pre-alarming system, the health status of bridge is obtained；InstituteSecond level pre-alarming system is stated to be made of level-one early warning value and second level early warning value；The second level early warning value is greater than the level-one early warning value.
Specifically, being determined as normal condition, bridge is normal when whole dynamic deflection correction values are less than the level-one early warning valueIt is open to traffic；When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but is less than the second level early warning value, sentenceIt is set to level-one alert status, bridge needs enclosure portion lane at this time, controls vehicle flowrate, and to had more than level-one early warning valueCrucial section is checked；When the dynamic deflection correction value in any crucial section is greater than the second level early warning value, it is determined as second levelAlert status needs closed allround traffic at this time, checks the crucial section of had more than second level early warning value.
A kind of safe early warning method of bridge provided in an embodiment of the present invention is by rejecting the dynamic of each crucial section acquisitionTemperature load effect value in amount of deflection initial data only includes carload effect value, obtains only including carload effect valueDynamic deflection correction value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior art from lengthIn phase monitoring data analyze bridge deterioration and its damage cause data not in time the problem of, obtain more timely assessment operationThe effect of the health status of bridge；In addition, the dynamic deflection correction value is compared with two-stage system pre-alarming system, can it is more acurrate,More directly react the dynamic response and dynamic rate of bridge.
Referring to fig. 2, the calculation method flow diagram of level-one early warning value provided in an embodiment of the present invention, including following stepIt is rapid:
S21, the finite element model for establishing the bridge, and according to the selected crucial section of bridge type；
S22, it is acted on the crucial section with unit load, obtains the deflection line in the crucial section；
S23, the least favorable loading area in the crucial section is obtained according to the deflection line；
S24, lane load is arranged in least favorable loading area, obtain the deflection limit value envelope diagram in crucial section；
S25, the maximum for selecting each crucial section according to the deflection limit value envelope diagram, minimum dynamic deflection limit value are as bridgeLevel-one early warning value, the level-one early warning value number is corresponding with the crucial section.
The present embodiment will be illustrated in conjunction with specific bridge, and the present embodiment uses combination across footpath for (L+M) m concrete oblique pullBridge, the present invention simultaneously not only limit the use of bridge in the present embodiment, different crucial sections may be selected according to the difference of bridge type and surveyedAmount, the two-stage system pre-alarming system are established before measuring the dynamic deflection initial data.
Specifically, establishing the finite element model (Fig. 3) of the bridge, and according to the N number of crucial section of bridge type selection, N is wholeNumber, and N is greater than or equal to 1, the quantity in the key section and position are selected according to the difference of bridge type.
Specifically, being acted on the crucial section with unit load 10kN, the deflection in the crucial section is obtainedLine (Fig. 4)；Deformation values in figure are the deflection value in the crucial section.
Specifically, obtain the least favorable loading area (Fig. 5) of the key sequence boundary according to the deflection line, it is described mostUnfavorable loading area is made of the maximum deformation value and minimal deformation value in the crucial section for limit value.
Specifically, present case is two-way eight tracks, it is highway-I grades according to national regulation design load, according to Fig. 6 formIt is that 360kN is loaded with lane load, carries out equal proportion calculating with the unit load 10kN, and add according to the least favorableIt carries region and obtains the maximum in each crucial section, minimum deflection limit value envelope diagram (Fig. 7), the limit value envelope diagram includes the passThe maximum in key section, minimum deflection limit value；Maximum described in highway series difference, minimum deflection limit value are also different, according to selectionBridge type calculated；Can show that level-one early warning value has 5 groups according to the limit value envelope diagram (Fig. 7), including each crucial cutThe dynamic deflection correction value of the maximum in face, minimum deflection limit value, each key section is compared with each corresponding level-one early warning value.
The present embodiment is by selecting different crucial sections as collection point, and the change generated under the action of unit loadShape value as theoretical value, in conjunction with specific bridge type obtain the maximum in the crucial section, minimum deflection limit value as level-one early warning value,It being capable of efficiently and accurately first order calculation early warning value.
It is a kind of second level pre-alarming system that the safe early warning method of bridge is established in the embodiment of the present invention referring to Fig. 8, Fig. 8Figure；
Specifically, the second level early warning value is selected using maximum vertical deflection value as defined in existing industry standard according to bridge typeCorresponding maximum vertical deflection value is selected as the second level early warning value；The maximum vertical deflection value is according to " road oblique roller bridgeDesign details " regulation, the girder for the concrete deck cable stayed bridge used in the present embodiment maximum vertical under carload effect scratchesDegree is 278mm, i.e., the described second level early warning value is 278mm；The maximum vertical amount of deflection is that the maximum of the concrete deck cable stayed bridge is heldBy deformation values, the level-one early warning value is less than the second level early warning value.
The present embodiment determines second level pre-alarming system by first order calculation early warning value and second level early warning value, can effectively, accuratelyThe health status for judging bridge, realize real-time monitoring bridge effect.
It is a kind of safety pre-warning system of bridge in the embodiment of the present invention referring to Fig. 9, Fig. 9, the system comprises:
System Data Collection Module 10 acquires dynamic deflection initial data, every group of institute for key each on bridge sectionStating dynamic deflection initial data includes carload effect value, temperature load effect value and influence of noise value；
Data processing module 20, it is using Via Nonlinear Principal Component Analysis-algorithm of support vector machine that dynamic deflection described in every group is originalThe temperature load effect value and influence of noise value of data obtain dynamic deflection correction value after rejecting；Dynamic deflection correction value described in every group is onlyIncluding carload effect value；
Determination module 30 determines institute for comparing the dynamic deflection correction value and preset two-stage system pre-alarming systemState the safe condition of bridge；The two-stage system pre-alarming system includes level-one early warning value and second level early warning value, and the second level early warningValue is greater than the level-one early warning value.
Specifically, the dynamic deflection that the data acquisition module 10 acquires each crucial section is original when there is vehicle to pass throughData, dynamic deflection initial data described in every group include carload effect value, temperature load effect value and influence of noise value；Specifically, the key section has N number of, and N is integer, and N is greater than or equal to 1.
Specifically, the data processing module 20 handles the dynamic deflection initial data, repaired with the dynamic deflectionDo not include the temperature load effect value in the second level pre-alarming system that compares of positive value, and the temperature load effect value andInfluence of the influence of noise value to dynamic deflection correction value is bigger, it is therefore desirable to reject the temperature lotus in the dynamic deflection initial dataCarry effect value and influence of noise value；With the sample data training non-linear member-supporting vector machine model, disjunctive model is established,The sample data is the dynamic deflection initial data of choosing acquisition in advance, and the disjunctive model is for separating the dynamic deflection original numberAccording to temperature load effect value and influence of noise value, obtain the dynamic deflection correction value；The dynamic deflection original number acquired each timeAccording to will be separated with the disjunctive model；Dynamic deflection correction value described in every group only includes carload effect value.
Specifically, the determination module 30 compares the dynamic deflection correction value with two-stage system pre-alarming system, bridge is obtainedThe health status of beam；The second level pre-alarming system is made of level-one early warning value and second level early warning value；The second level early warning value is greater thanThe level-one early warning value.
Wherein, the crucial section has N number of；N is integer, and N is greater than or equal to 1；The dynamic deflection correction value with it is describedCrucial section corresponds.
Wherein, the determination module is further used for；When the dynamic deflection correction value in all crucial sections is less than the level-oneWhen early warning value, it is determined as normal condition；When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but it is less thanWhen the second level early warning value, it is determined as level-one alert status；When the dynamic deflection correction value in any crucial section is greater than the second levelWhen early warning value, it is determined as second level alert status.
Specifically, being determined as normal condition, bridge is normal when whole dynamic deflection correction values are less than the level-one early warning valueIt is open to traffic；When the dynamic deflection correction value in any crucial section is greater than the level-one early warning value, but is less than the second level early warning value, sentenceIt is set to level-one alert status, bridge needs enclosure portion lane at this time, controls vehicle flowrate, and to had more than level-one early warning valueCrucial section is checked；When the dynamic deflection correction value in any crucial section is greater than the second level early warning value, it is determined as second levelAlert status needs closed allround traffic at this time, checks the crucial section of had more than second level early warning value.
Wherein, the level-one early warning value precalculates to obtain by following steps: the finite element model of the bridge is established,And according to the selected crucial section of bridge type；It is acted on the crucial section with unit load, obtains the amount of deflection in the crucial sectionInfluence line；The least favorable loading area in the crucial section is obtained according to the deflection line；In least favorable loading area clothLane load is set, the deflection limit value envelope diagram in crucial section is obtained；According to selected maximum, the most petty action of the deflection limit value envelope diagramLevel-one early warning value of the deflection limit value as bridge, the level-one early warning value number are corresponding with the crucial section.
Wherein, the second level early warning value is selected using maximum vertical deflection value as defined in existing industry standard according to bridge typeCorresponding maximum vertical deflection value is as the second level early warning value.
A kind of safety pre-warning system of bridge provided in an embodiment of the present invention is by data acquisition module in a crucial sectionDynamic deflection initial data is acquired, and the temperature load effect value and influence of noise that are affected are rejected by data processing moduleValue obtains dynamic deflection correction value only including carload effect value, solves and only monitor static deflection in the prior art and makeAt the problem that monitoring data are not real-time and inaccurate, the determination module is by the dynamic deflection correction value and two-stage system pre-alarming systemIt compares, obtains the health status of bridge, more acurrate, more can directly react the dynamic response and dynamic rate of bridge.
In conclusion safe early warning method and system that the present invention implements a kind of bridge provided are by rejecting each keyTemperature load effect value and influence of noise value in the dynamic deflection initial data of section acquisition obtain only including carload effectThe dynamic deflection correction value of value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior artFrom long term monitoring data analyze bridge deterioration and its damage cause data not in time the problem of, obtain and more timely assessRun the effect of the health status of bridge；In addition, the dynamic deflection correction value is compared with two-stage system pre-alarming system, it can be more quasi-Really, the dynamic response and dynamic rate of bridge are more directly reacted.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the artFor, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered asProtection scope of the present invention.