CN109556848A - A kind of simply supported girder bridge structure damage monitoring system based on Transverse Distribution - Google Patents
A kind of simply supported girder bridge structure damage monitoring system based on Transverse Distribution Download PDFInfo
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- CN109556848A CN109556848A CN201811544760.3A CN201811544760A CN109556848A CN 109556848 A CN109556848 A CN 109556848A CN 201811544760 A CN201811544760 A CN 201811544760A CN 109556848 A CN109556848 A CN 109556848A
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- dynamic strain
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- transverse distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Bridges Or Land Bridges (AREA)
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Abstract
The present invention relates to bridge structure real-time monitoring systems to be related to a kind of structure damage monitoring system and corresponding structure monitoring sensor arrangement method and Structural Damage Assessment method particular for simply supported girder bridge.Dynamic strain sensor is arranged across, 3/4ths cross-locations across, half by a quarter at each single plate beam bottom of simply supported girder bridge, dynamic response situation when monitoring loaded vehicle passes through；Loaded vehicle is analyzed by the Transverse Distribution of period dynamic strain sensor on this basis, lateral connection damage is determined by the situation of change of Transverse Distribution, and make early warning in time, reports damage position.The present invention can effectively monitor the lateral connection failure of simply supported girder bridge, the case where issuing early warning in time, avoid single-beam stress.
Description
Technical field
The present invention relates to bridge structure real-time monitoring systems to be related to a kind of structure damage monitoring particular for simply supported girder bridge
System and corresponding structure monitoring sensor arrangement method and Structural Damage Assessment method.
Background technique
Related data show, the bridge of China's Mid and minor spans accounts for 80% or so of the existing bridge total amount in China, and simply supported girder bridge
It is an important component of Mid and minor spans concrete-bridge again.With the extension of simply supported girder bridge service phase, traffic loading etc.
The raising of grade, the simply supported girder bridge bearing capacity built in early days are no longer satisfied the demand of Modern Traffic.Currently, in-service freely-supported
Beam bridge quite a few had already appeared in various degree and various forms of diseases, and lateral connection failure be simply supported girder bridge the most
One of main disease.The typical feature of lateral connection failure is that junction steel plate surface concrete peels off and junction steel plate weld seam is opened
It splits, prevent bearing beam is from effectively transmitting load to non-stress beam.The failure of simply supported girder bridge lateral connection can reduce bridge
The globality of structure influences the cross direction profiles rule of load, stress beam deflection is caused to increase, and non-stress beam deflection becomes smaller, so that
It cannot cooperate well between bearing beam and non-stress beam, bearing beam is easy to appear destruction.Will appear when serious " single-beam by
The case where power ", buries huge security risk to communications and transportation.Currently, there is no a set of effective, system simply supported beams
Bridge lateral connection failure monitor method.Therefore, the monitoring for carrying out the damage of simply supported girder bridge lateral connection has a very important significance.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of dynamic strain to monitor system, pacifies in the designated position of bridge
Dynamic strain sensor is filled, is laterally divided by monitoring loaded vehicle traveling load dynamic response situation, and to the dynamic strain of monitoring cross section
Cloth coefficient is analyzed, and can be monitored loaded vehicle and be acted on lower simply supported girder bridge dynamic strain lateral transport situation, assess Bridge Structural Damage shape
Condition.
A kind of intelligence dynamic strain simple beam structure damage monitoring system, the technical solution adopted is that: it include data acquisition
System and data process subsystem.
The data acquisition subsystem includes dynamic strain sensor and Multi-channel data acquisition equipment, data processing
System includes data preprocessing module, data analysis module and database.The output of the dynamic strain sensor is connected to multi-pass
Track data acquires the input of equipment, and the output of the Multi-channel data acquisition equipment is connected to the input of data preprocessing module,
The output of the data preprocessing module is connected to the input of data analysis module and database, the data analysis module sum number
It is connected according to library.
The data acquisition subsystem, each single plate beam bottom of simply supported girder bridge a quarter across, half across,
3/4ths cross-locations arrange dynamic strain sensor, for monitoring dynamic strain situation when single loaded vehicle passes through.For single by M
The simply supported girder bridge that plate-girder is constituted, the number often across dynamic strain sensor are N=3 × M.
The Multi-channel data acquisition equipment carries out signal condition and low-pass filtering, drop to collected dynamic strain signal
Low signal noise.
The result of all initial data of the database purchase, the result of data prediction and data analysis.
The data preprocessing module, the data that each dynamic strain sensor is acquired are clustered using K mean cluster algorithm
For valid data and invalid data, rejecting abnormalities data, and interpolation supplement is carried out according to data trend, so that it is guaranteed that data has
Effect property.
The K mean cluster algorithm, by the acquisition data of dynamic strain sensorAs training sample,For cluster label, wherein yi=1 indicates valid data, yi=2 indicate invalid data.The dispersion situation of cluster y is, whereinFor the center of cluster y,For the total sample number for belonging to cluster y.For two cluster y=1,2, dispersion value
The sum of it is minimum when determine cluster label belonging to it, i.e. formulaIt is minimum.
The data analysis module, in the case where system brings into operation initial stage acquisition load action, the dynamic of each sensor is answered first
Become Transverse Distribution standard scale, continuous verification, root are carried out to the dynamic strain Transverse Distribution of operation stage on this basis
The situation of bridge damnification is judged according to the situation of change of Transverse Distribution and issues early warning.
For the simply supported girder bridge that M single plate beam is constituted, the dynamic strain sensor number in single span is expressed as matrix, often
A line indicates that the sensor for being located at same cross section, each column indicate the sensor being located on same beam slab:
Dynamic strain peak value measured by each dynamic strain sensor in the load action time are as follows:
When load center is in i-th of beam slab, sensorDynamic strain peak valueIt is maximum value of the row, then
The Transverse Distribution of dynamic strain sensor is represented by lower column matrix on the beam slab, and jth row indicates sensorTransverse direction point
Cloth coefficient:
In subsequent monitoring process, loaded vehicle load action obtains the cross direction profiles of each sensor in i-th of beam slab each time
Coefficient, and be compared with Transverse Distribution standard scale；When some Transverse Distribution continuous several times declines and is more than some
When limit value, it can determine that between the corresponding beam slab of the coefficient and beam slab i lateral connection damage occur.
The loaded vehicle is preferably 20 tons or more of vehicle.
The invention has the advantages that arranging that dynamic strain passes by the key position at each single plate beam bottom of simply supported girder bridge
Sensor, and by the monitoring to dynamic strain Transverse Distribution, it can effectively monitor the structural damage of simply supported girder bridge and laterally connect
The case where connecing failure, issue early warning in time, avoiding single-beam stress.
Detailed description of the invention
Fig. 1 is veneer simply supported beam dynamic strain sensor layout schematic diagram.
Fig. 2 is simply supported girder bridge dynamic strain sensor integral installation layout drawing.
Fig. 3 is simply supported girder bridge structure damage monitoring system principle diagram of the present invention.
Fig. 4 is the acquisition of structure monitoring data, convergence and Analysis of Structural Damage flow chart.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described in detail.
Simply supported girder bridge structure monitoring schematic diagram arrangement such as Fig. 1, structural appraisal of the invention are as shown in Figure 2 in the present invention.
Veneer simply supported beam dynamic strain sensor arrangement in the present invention is as shown in Figure 1, simply supported girder bridge dynamic strain sensor is whole
Mounting arrangements as shown in Fig. 2, system principle diagram as shown in figure 3, Fig. 4 be structure monitoring data acquisition, convergence and structural damage
Analysis flow chart diagram.
As shown in Fig. 2, system includes data acquisition subsystem and data process subsystem.
The data acquisition subsystem includes dynamic strain sensor and Multi-channel data acquisition equipment, data processing
System includes data preprocessing module, data analysis module and database.The output of the dynamic strain sensor is connected to multi-pass
Track data acquires the input of equipment, and the output of the Multi-channel data acquisition equipment is connected to the input of data preprocessing module,
The output of the data preprocessing module is connected to the input of data analysis module and database, the data analysis module sum number
It is connected according to library.
The data acquisition subsystem, each single plate beam bottom of simply supported girder bridge a quarter across, half across,
3/4ths cross-locations arrange dynamic strain sensor, for monitoring dynamic strain situation when single loaded vehicle passes through.For single by M
The simply supported girder bridge that plate-girder is constituted, the number often across dynamic strain sensor are N=3 × M.The loaded vehicle is preferably 20 tons or more of vehicle
?.
The Multi-channel data acquisition equipment carries out signal condition and low-pass filtering, drop to collected dynamic strain signal
Low signal noise.
The result of all initial data of the database purchase, the result of data prediction and data analysis.
The data preprocessing module, the data that each dynamic strain sensor is acquired are clustered using K mean cluster algorithm
For valid data and invalid data, rejecting abnormalities data, and interpolation supplement is carried out according to data trend, so that it is guaranteed that data has
Effect property.
The K mean cluster algorithm, by the acquisition data of dynamic strain sensorAs training sample,For cluster label, wherein yi=1 indicates valid data, yi=2 indicate invalid data.The dispersion situation of cluster y is, whereinFor the center of cluster y,For the total sample number for belonging to cluster y.For two cluster y=1,2, dispersion value
The sum of it is minimum when determine cluster label belonging to it, i.e. formulaIt is minimum.
The data analysis module, in the case where system brings into operation initial stage acquisition load action, the dynamic of each sensor is answered first
Become Transverse Distribution standard scale, continuous verification, root are carried out to the dynamic strain Transverse Distribution of operation stage on this basis
The situation of bridge damnification is judged according to the situation of change of Transverse Distribution and issues early warning.
For the simply supported girder bridge that M single plate beam is constituted, the dynamic strain sensor number in single span is expressed as matrix, often
A line indicates that the sensor for being located at same cross section, each column indicate the sensor being located on same beam slab:
Dynamic strain peak value measured by each dynamic strain sensor in the load action time are as follows:
When load center is in i-th of beam slab, sensorDynamic strain peak valueIt is maximum value of the row,
Then the Transverse Distribution of dynamic strain sensor is represented by lower column matrix on the beam slab, and jth row indicates sensorTransverse direction
Breadth coefficient:
In subsequent monitoring process, loaded vehicle load action obtains the cross direction profiles of each sensor in i-th of beam slab each time
Coefficient, and be compared with Transverse Distribution standard scale；When some Transverse Distribution continuous several times declines and is more than some
When limit value k, it can determine that between the corresponding beam slab of the coefficient and beam slab i lateral connection damage occur.The value of k can empirically and
Depending on actual conditions, 30% or 50% is generally taken.
The present invention is not limited to the above embodiments, made any to above embodiment aobvious of those skilled in the art and
The improvement or change being clear to, all protection scope without departing from design of the invention and appended claims.
Claims (2)
1. a kind of simply supported girder bridge structure damage monitoring system based on Transverse Distribution includes data acquisition subsystem and data
Processing subsystem, it is characterised in that:
The data acquisition subsystem includes dynamic strain sensor and Multi-channel data acquisition equipment, the data process subsystem
Including data preprocessing module, data analysis module and database；
The output of the dynamic strain sensor is connected to the input of Multi-channel data acquisition equipment, and the multi-channel data acquisition is set
Standby output is connected to the input of data preprocessing module, and the output of the data preprocessing module is connected to data analysis module
With the input of database, the data analysis module is connected with database；
The data acquisition subsystem, each single plate beam bottom of simply supported girder bridge a quarter across, half across, four points
Three cross-locations arrange dynamic strain sensor, for monitoring dynamic strain situation when single loaded vehicle passes through；
The Multi-channel data acquisition equipment carries out signal condition and low-pass filtering to collected dynamic strain signal, reduces letter
Number noise；
The result of all initial data of the database purchase, the result of data prediction and data analysis；
The data preprocessing module, the data that each dynamic strain sensor is acquired use K mean cluster algorithm cluster to have
Data and invalid data, rejecting abnormalities data are imitated, and interpolation supplement is carried out according to data trend, so that it is guaranteed that data is effective
Property；
The data analysis module, in the case where system brings into operation initial stage acquisition load action, the dynamic strain of each sensor is horizontal first
To breadth coefficient standard scale, continuous verification is carried out to the dynamic strain Transverse Distribution of operation stage on this basis, according to cross
The situation of bridge damnification is judged to the situation of change of breadth coefficient and issues early warning；
The calculation method of the Transverse Distribution is as follows: the simply supported girder bridge constituted for M single plate beam, the dynamic strain in single span
Sensor number is expressed as matrix, and every a line indicates that the sensor for being located at same cross section, each column indicate to be located at same
Sensor on beam slab:
Dynamic strain peak value measured by each dynamic strain sensor in the load action time are as follows:
When load center is in i-th of beam slab, sensorDynamic strain peak valueIt is maximum value of the row, then
The Transverse Distribution of dynamic strain sensor is represented by lower column matrix on the beam slab, and jth row indicates sensorTransverse direction point
Cloth coefficient:
In subsequent monitoring process, loaded vehicle load action obtains the cross direction profiles of each sensor in i-th of beam slab each time
Coefficient, and be compared with Transverse Distribution standard scale；When some Transverse Distribution continuous several times declines and is more than some
When limit value, it can determine that between the corresponding beam slab of the coefficient and beam slab i lateral connection damage occur.
2. the simply supported girder bridge structure damage monitoring system according to claim 1 based on Transverse Distribution, feature exist
In the vehicle that the loaded vehicle is 20 tons or more.
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Application publication date: 20190402 |