CN107687924B - A kind of safe early warning method and system of bridge - Google Patents
A kind of safe early warning method and system of bridge Download PDFInfo
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- CN107687924B CN107687924B CN201710753312.3A CN201710753312A CN107687924B CN 107687924 B CN107687924 B CN 107687924B CN 201710753312 A CN201710753312 A CN 201710753312A CN 107687924 B CN107687924 B CN 107687924B
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- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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Abstract
The invention discloses a kind of safe early warning methods of bridge, comprising: acquires dynamic deflection initial data in upper each crucial section of bridge main beam, dynamic deflection initial data described in every group includes carload effect value, temperature load effect value and influence of noise value；After the temperature load effect value of dynamic deflection initial data described in every group and influence of noise value being rejected using Via Nonlinear Principal Component Analysis-algorithm of support vector machine obtain dynamic deflection correction value；Dynamic deflection correction value described in every group only includes carload effect value；The dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determine the health status of the bridge.The invention also discloses a kind of safety pre-warning systems of bridge.Using the embodiment of the present invention, the dynamic response and dynamic rate of bridge more acurrate, more can be directly reacted by monitoring real-time dynamic deflection, the health status of operation bridge can be preferably assessed, find bridge problem accurately and in time.
Description
Technical field
The present invention relates to bridge structural health monitoring field more particularly to the safe early warning methods and system of a kind of bridge.
Background technique
In bridge health monitoring system and loading test, amount of deflection is an extremely important index, as deformation
A kind of description form can evaluate bridge quality and operation state, reflect the rigidity of bridge, be that bridge overall deformation is most apparent
Reflection.The especially dynamic deflection of bridge even more reflects bridge stiffness the most in real time, be bridge under carload effect most
Really to reflect.By carrying out numerical analysis to dynamic deflection, the impact coefficient of available carload and bridge structure
Internal force distribution situation, so that the globality and deterioration position to bridge judge.Under carload effect, bridge structure will
The deformation and stress bigger than under the effect of identical dead load are generated, so the dynamic response of bridge is all science of bridge building all the time
In an important research topic.The factors such as dynamic deflection and carload, surface conditions, bridge health are related, but rise and close
Key effect or carload and bridge health status.
The amount of deflection of bridge major section is evaluation one of bridge quality and the important indicator of operating status, in the prior art
Bridge health monitoring system only " static deflection " of bridge is monitored, and only from long-term monitoring data point
Analyse the deterioration and its damage of bridge.In contrast, real-time dynamic deflection more acurrate, more can directly react the dynamic response of bridge
And dynamic rate, the health status of operation bridge can be preferably assessed, finds bridge defect accurately and in time.
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 bridge
Dynamic 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 beam
According 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 group
Load 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 lotus
Carry effect value；
S13, the dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determines the health of the bridge
State；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 one
Grade 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 acquisition
Temperature load effect value and influence of noise value in amount of deflection initial data obtain the only dynamic deflection including carload effect value and repair
Positive value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior art from long term monitoring data
It is middle analysis bridge deterioration and its damage cause data not in time the problem of, obtain more timely assessment operation bridge health
The 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 deflection
Correction 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 level
Early 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 value
When, 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 bridge
Level-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 section
It 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, solve
The 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 warning
The 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, often
The 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 group
According 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 wrapped
Include carload effect value；
Determination module, for comparing the dynamic deflection correction value and preset two-stage system pre-alarming system, described in judgement
The 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 big
In 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 number
Dynamic 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 made
Comparison 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 rung
Should 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 deflection
Correction 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 value
When, 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 bridge
Finite element model, and according to the selected crucial section of bridge type；It is acted on the crucial section with unit load, obtains the pass
The deflection line in key section；The least favorable loading area in the crucial section is obtained according to the deflection line；Least
Sharp 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 diagram
Level-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 described
Crucial 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 section
Dynamic deflection initial data is acquired, and the temperature load effect value and influence of noise that are affected are rejected by data processing module
Value obtains dynamic deflection correction value only including carload effect value, solves and only monitor static deflection in the prior art and make
At 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 system
Comparison, obtains the health status of bridge, more acurrate, more can directly react the dynamic response and dynamic rate of bridge.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of the safe early warning method of bridge in the embodiment of the present invention；
Fig. 2 is the calculation method flow diagram of level-one early warning value in the embodiment of the present invention；
Fig. 3 is the finite element model figure that the calculation method of level-one early warning value in the embodiment of the present invention is established；
Fig. 4 is the deflection line that the calculation method of level-one early warning value in the embodiment of the present invention obtains；
Fig. 5 is the least favorable loading area figure that the calculation method of level-one early warning value in the embodiment of the present invention obtains；
Fig. 6 is-I grades of lane load figures of highway of the calculation method of level-one early warning value in the embodiment of the present invention；
Fig. 7 is the deflection limit value envelope diagram that the calculation method of level-one early warning value in the embodiment of the present invention obtains；
Fig. 8 is a kind of second level pre-alarming system figure that the safe early warning method of bridge is established in the embodiment of the present invention；
Fig. 9 is a kind of structural schematic diagram of the safety pre-warning system of bridge in the embodiment of the present invention.
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, complete
Site 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 on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment 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 following
Step:
S11, crucial section acquires dynamic deflection initial data, dynamic deflection original number described in every group each of on bridge main beam
According 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 group
Load 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 lotus
Carry effect value；
S13, the dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determines the health of the bridge
State；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 one
Grade 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 described
Crucial 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 value
It 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 level
When 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, sentence
It 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 through
Stating dynamic deflection initial data includes 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；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 value
Effect 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 compared
Greatly, it is therefore desirable to reject；With the sample data training non-linear member-supporting vector machine model, disjunctive model, the sample are established
Notebook data is dynamic deflection initial data gathered in advance, and the disjunctive model is used to separate the temperature of the dynamic deflection initial data
Load effect value and influence of noise value obtain the dynamic deflection correction value；The dynamic deflection initial data acquired each time will be used
The 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；Institute
Second 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 value
It 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, sentence
It 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 value
Crucial 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 level
Alert 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 acquisition
Temperature load effect value in amount of deflection initial data only includes carload effect value, obtains only including carload effect value
Dynamic deflection correction value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior art from length
In phase monitoring data analyze bridge deterioration and its damage cause data not in time the problem of, obtain more timely assessment operation
The 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 step
It 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 bridge
Level-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 pull
Bridge, 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 surveyed
Amount, 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 whole
Number, 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 obtained
Line (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 most
Unfavorable 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 form
It is that 360kN is loaded with lane load, carries out equal proportion calculating with the unit load 10kN, and add according to the least favorable
It 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 pass
The maximum in key section, minimum deflection limit value；Maximum described in highway series difference, minimum deflection limit value are also different, according to selection
Bridge 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 cut
The 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 load
Shape 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. 8
Figure；
Specifically, the second level early warning value is selected using maximum vertical deflection value as defined in existing industry standard according to bridge type
Corresponding maximum vertical deflection value is selected as the second level early warning value；The maximum vertical deflection value is according to " road oblique roller bridge
Design details " regulation, the girder for the concrete deck cable stayed bridge used in the present embodiment maximum vertical under carload effect scratches
Degree 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 held
By 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, accurately
The 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 section
Stating 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 original
The 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 only
Including carload effect value；
Determination module 30 determines institute for comparing the dynamic deflection correction value and preset two-stage system pre-alarming system
State 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 warning
Value 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 through
Data, 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 deflection
Do 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 and
Influence 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 data
Carry 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 number
According to temperature load effect value and influence of noise value, obtain the dynamic deflection correction value；The dynamic deflection original number acquired each time
According 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 obtained
The 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 than
The 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 described
Crucial 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-one
When 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
When 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 level
When 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 value
It 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, sentence
It 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 value
Crucial 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 level
Alert 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 section
Influence line；The least favorable loading area in the crucial section is obtained according to the deflection line；In least favorable loading area cloth
Lane 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 diagram
Level-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 type
Corresponding 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 section
Dynamic deflection initial data is acquired, and the temperature load effect value and influence of noise that are affected are rejected by data processing module
Value obtains dynamic deflection correction value only including carload effect value, solves and only monitor static deflection in the prior art and make
At 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 system
It 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 key
Temperature load effect value and influence of noise value in the dynamic deflection initial data of section acquisition obtain only including carload effect
The dynamic deflection correction value of value；By the dynamic deflection correction value in real-time monitoring bridge key section, solve in the prior art
From long term monitoring data analyze bridge deterioration and its damage cause data not in time the problem of, obtain and more timely assess
Run 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 art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (6)
1. a kind of safe early warning method of bridge, which is characterized in that the described method includes:
S11, crucial section acquires dynamic deflection initial data, dynamic deflection raw data packets described in every group each of on bridge main beam
Include carload effect value, temperature load effect value and influence of noise value；
S12, the temperature load of dynamic deflection initial data described in every group is imitated using Via Nonlinear Principal Component Analysis-algorithm of support vector machine
It should be worth after being rejected with influence of noise value and obtain dynamic deflection correction value；Dynamic deflection correction value described in every group only includes carload effect
Value；
S13, the dynamic deflection correction value and preset two-stage system pre-alarming system are compared, determines the healthy shape of the bridge
State；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 the level-one
Early warning value；
Wherein, 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 is less than the second level early warning value, sentence
It is set to 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；
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, one of the maximum, minimum dynamic deflection limit value in each crucial section as bridge is selected according to the deflection limit value envelope diagram
Grade early warning value, the level-one early warning value number are corresponding with the crucial section.
2. the safe early warning method of bridge as described in claim 1, which is characterized in that the key section has N number of；N is whole
Number, and N is greater than or equal to 1；The dynamic deflection correction value and the crucial section correspond.
3. the safe early warning method of bridge as described in claim 1, which is characterized in that the second level early warning value uses existing row
Maximum vertical deflection value as defined in industry specification selects corresponding maximum vertical deflection value as the second level early warning according to bridge type
Value.
4. a kind of safety pre-warning system of bridge characterized by comprising
Data acquisition module acquires dynamic deflection initial data for key each on bridge main beam section, moves and scratch described in every group
Spending 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 initial data described in every group
Temperature load effect value and influence of noise value obtain dynamic deflection correction value after rejecting；Dynamic deflection correction value described in every group only includes vapour
Vehicle load effect value；
Determination module determines the bridge for comparing the dynamic deflection correction value and preset two-stage system pre-alarming system
Safe condition；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
The level-one early warning value；
Wherein, 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 is less than the second level early warning value, sentence
It is set to 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；
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 deflection line in the crucial section；
The least favorable loading area in the crucial section is obtained according to the deflection line；
Lane load is arranged in least favorable loading area, obtains the deflection limit value envelope diagram in crucial section；
The level-one early warning of the maximum, minimum deflection limit value in each crucial section as bridge is selected according to the deflection limit value envelope diagram
Value, the level-one early warning value number are corresponding with the crucial section.
5. the safety pre-warning system of bridge as claimed in claim 4, which is characterized in that the key section has N number of；N is integer,
And N is greater than or equal to 1；The dynamic deflection correction value and the crucial section correspond.
6. the safety pre-warning system of bridge as claimed in claim 4, which is characterized in that the second level early warning value uses existing industry
Maximum vertical deflection value, selects corresponding maximum vertical deflection value as the second level early warning according to bridge type as defined in standardizing
Value.
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| CN110132511B (en) * | 2019-05-30 | 2020-10-27 | 山东省建筑科学研究院有限公司 | Bridge structure monitoring and evaluating method based on dynamic deflection attenuation law |
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| CN111504245B (en) * | 2020-04-24 | 2022-01-28 | 山东高速工程检测有限公司 | Bridge linear measuring method in operation period |
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