CN115389143A - Method for monitoring and evaluating state of special bridge structure for large-span track - Google Patents
Method for monitoring and evaluating state of special bridge structure for large-span track Download PDFInfo
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- CN115389143A CN115389143A CN202210999656.3A CN202210999656A CN115389143A CN 115389143 A CN115389143 A CN 115389143A CN 202210999656 A CN202210999656 A CN 202210999656A CN 115389143 A CN115389143 A CN 115389143A
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The method for monitoring and evaluating the structural state of the special bridge for the large-span track comprises the following steps: s1: designing a monitoring system scheme according to relevant specifications and bridge structure characteristics; s2: the method comprises the following steps of (1) mounting a sensor according to a designed monitoring system scheme, wherein the sensor comprises a GNSS deformation monitoring system, a grating optical fiber strain sensor and the like, and the acquisition frequency is more than 1HZ; s3: the self-development bridge structure monitoring system comprises subsystems such as data acquisition, data transmission, data processing, data management, data analysis and application and the like; in conclusion, the response value under the action of the train load of the large-span track bridge is monitored and compared with the threshold value, the condition that the response value is smaller than or equal to the threshold value indicates that the structure is in a safe state, and early warning is needed when the response value is larger than the threshold value; the method provided by the invention is used for evaluating and analyzing mass data of the long-span track bridge health monitoring system and extracting useful characteristics or indexes so as to accurately evaluate the current real state of the bridge structure.
Description
Technical Field
The invention belongs to the technical field of bridge health monitoring, and particularly relates to a method for monitoring and evaluating the structural state of a bridge special for a long-span track.
Background
Large-span bridges, such as cable-stayed bridges, suspension bridges and the like, are damaged due to factors such as loads and environments after long-term operation, the safety and the normal use performance of the bridges are affected, and therefore regular or special detection, maintenance and reinforcement are needed. In recent years, a plurality of large-span bridges are provided with health monitoring systems for evaluating the operation state of the bridges, most of the existing evaluation methods are suitable for monitoring and evaluating the state of a highway bridge structure, and the health monitoring systems generate massive data every day, so that the analysis and the processing of the data in the evaluation process are time-consuming and labor-consuming; meanwhile, how to extract useful characteristics or indexes from mass data to accurately evaluate the current real state of the bridge structure is always a difficult problem in the field of bridge health evaluation research.
Disclosure of Invention
The invention aims to provide a method for monitoring and evaluating the structural state of a bridge special for a long-span track, and solves the technical problem that the method for evaluating the operation state of a track bridge through mass data generated by a health monitoring system in the prior art wastes time and labor.
In order to solve the technical problem, the invention adopts the following technical scheme: the method for monitoring and evaluating the structural state of the special bridge for the large-span track comprises the following steps:
s1: designing a monitoring system scheme according to relevant specifications and bridge structure characteristics;
s2: the method comprises the following steps that sensor installation is carried out according to a designed monitoring system scheme, wherein the sensor installation comprises a GNSS deformation monitoring system, a grating optical fiber strain sensor and the like, and the acquisition frequency is required to be more than 1HZ;
s3: the method comprises the steps of automatically developing a bridge structure monitoring system, wherein the bridge system monitoring system comprises subsystems such as data acquisition, data transmission, data processing, data management, data analysis and application and the like, and realizes real-time monitoring of the structure state of the bridge special for the large-span track, and the data comprises action responses such as trains, temperature, wind, shrinkage and creep and the like;
s4: train trigger devices are installed at the starting and stopping ends of the bridge, and corresponding moments are identified and recorded by the trigger devices when a train goes up and down the bridge;
s5: identifying a response value under the action of a train load by taking the monitoring data of the moment when the train is on the bridge as a reference value, wherein the response value comprises structural deformation and stress monitoring data;
s6: installing train axle weight measuring devices at the starting and stopping ends of the bridge, and inputting axle weight parameters into a finite element model to obtain a structure theoretical calculation value;
s7: and comparing and analyzing the response value under the action of the train load with a threshold value, and realizing the real-time evaluation of the bridge structure state.
Further, the triggering device in step S4 includes a central control unit and an infrared camera, the infrared camera is installed on the bridge, and the infrared camera is connected to the central control unit.
Further, the axle weight measuring device in the step S6 includes an obtaining module, configured to obtain parameter information of any vehicle in the rail train, and calculate a resistance applied to the vehicle according to the parameter information;
the first calculation module is used for obtaining the tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; the second calculation module is used for calculating the acting force of a wheel shaft corresponding to each wheel pair in the vehicle, the resultant force of the couplers suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheel-track force;
and the axle weight calculating module is used for calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the resultant force of the car coupler and the transverse force.
Further, the method for measuring the axle weight by using the axle weight measuring device in the step S6 comprises the following steps:
(1) Acquiring parameter information of any vehicle in a rail train, and calculating the resistance of the vehicle according to the parameter information;
(2) Obtaining a tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; calculating the acting force of an axle corresponding to each wheel pair in the vehicle, the resultant force of a coupler suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheeltrack force;
(3) And calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the coupler resultant force and the transverse force.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the response value under the action of the train load of the large-span track bridge is monitored and compared with the threshold value, when the response value is less than or equal to the threshold value, the structure is in a safe state, and when the response value is greater than the threshold value, early warning is needed; the method provided by the invention is used for evaluating and analyzing mass data of the health monitoring system and extracting useful characteristics or indexes so as to accurately evaluate the current real state of the bridge structure. The method is special monitoring and evaluation for the track bridge, compared with a highway bridge, the track bridge has the characteristics of single train load, regular train running and the like, and meanwhile, the train can pass through the bridge in a short time, and the effects of environmental temperature, wind and the like can be regarded as being unchanged; therefore, the measured data of the monitoring system and the theoretical data of the finite element model can correspond to each other, and the evaluation is guaranteed to be reliable and effective.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a main span midspan vertical deformation real-time monitoring data table;
FIG. 2 is a main span midspan vertical deformation monitoring data table under the action of a single train;
FIG. 3 is a real-time evaluation table of the vertical deformation of the main span under the action of a single train;
fig. 4 is a schematic view of the axle weight measuring device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The present invention will be described in further detail with reference to examples.
The invention provides a specific embodiment of a method for monitoring and evaluating the structural state of a bridge special for a large-span track, which comprises the following steps:
the method for monitoring and evaluating the structural state of the bridge special for the large-span track comprises the following steps:
s1: the design of a monitoring system is carried out according to relevant specifications and structural characteristics, wherein the relevant specifications are part 2 of the urban rail transit facility operation monitoring technical specification: bridge (GB/T39559.2-2020), the structural characteristics comprise bridge type, stress characteristics, risk characteristics and the like;
s2: mounting sensors according to a monitoring scheme, wherein the sensors comprise a GNSS deformation monitoring system, a grating optical fiber strain sensor and the like, and the acquisition frequency is required to be more than 1HZ;
s3: the method comprises the steps of automatically developing a bridge structure monitoring system, wherein the bridge system monitoring system comprises subsystems such as data acquisition, data transmission, data processing, data management, data analysis and application and the like, and realizes real-time monitoring of the structure state of the bridge special for the large-span track, and the data comprises action responses such as trains, temperature, wind, shrinkage and creep and the like; the bridge structure monitoring system has the functions of continuously monitoring set parameters of the bridge, automatically recording, displaying data and performing alarm evaluation;
s4: train trigger devices are installed at the starting and stopping ends of the bridge, and corresponding moments are identified and recorded by the trigger devices when a train goes up and down the bridge; the triggering device comprises a central control unit and an infrared camera, the infrared camera is installed on the bridge and is connected with the central control unit;
s5: identifying a response value under the action of a train load by taking the monitoring data of the moment when the train is on the bridge as a reference value, wherein the response value comprises structural deformation and stress monitoring data; as shown in fig. 1, it is a real-time monitoring data table for vertical deformation of the main span, and fig. 2 is a monitoring data table for vertical deformation of the main span under the action of a single train;
s6: installing train axle load measuring devices at the starting end and the stopping end of the bridge, and inputting axle load parameters into a finite element model to obtain a structural theoretical calculation value;
s7: comparing and analyzing the response value under the action of the train load with a threshold value, and realizing the real-time evaluation of the bridge structure state; as shown in fig. 3, the real-time evaluation table is a table for vertical deformation of the main span under the action of a single train.
As shown in fig. 4, the axle weight measuring device in step S6 includes an obtaining module, configured to obtain parameter information of any vehicle in the rail train, and calculate a resistance applied to the vehicle according to the parameter information;
the first calculation module is used for obtaining the tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; the second calculation module is used for calculating the acting force of a wheel shaft corresponding to each wheel pair in the vehicle, the resultant force of a coupler suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheel track force;
and the axle weight calculating module is used for calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the resultant force of the car coupler and the transverse force.
The method for measuring the axle weight by adopting the axle weight measuring device in the step S6 comprises the following steps:
(1) Acquiring parameter information of any vehicle in a rail train, and calculating the resistance of the vehicle according to the parameter information;
(2) Obtaining a tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; calculating the acting force of an axle corresponding to each wheel pair in the vehicle, the resultant force of a coupler suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheeltrack force;
(3) Calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the resultant coupler force and the transverse force
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The method for monitoring and evaluating the structural state of the special bridge for the large-span track is characterized by comprising the following steps of:
s1: designing a monitoring system scheme according to relevant specifications and bridge structure characteristics;
s2: the method comprises the following steps of (1) mounting a sensor according to a designed monitoring system scheme, wherein the sensor comprises a GNSS deformation monitoring system, a grating optical fiber strain sensor and the like, and the acquisition frequency is more than 1HZ;
s3: the method comprises the steps of automatically developing a bridge structure monitoring system, wherein the bridge system monitoring system comprises subsystems such as data acquisition, data transmission, data processing, data management, data analysis and application and the like, and realizes real-time monitoring of the structure state of the bridge special for the large-span track, and the data comprises action responses such as trains, temperature, wind, shrinkage and creep and the like;
s4: train trigger devices are installed at the starting and stopping ends of the bridge, and corresponding moments are identified and recorded by the trigger devices when a train goes up and down the bridge;
s5: identifying a response value under the action of a train load by taking the monitoring data of the train on-bridge moment as a reference value, wherein the response value comprises structural deformation and stress monitoring data;
s6: installing train axle weight measuring devices at the starting and stopping ends of the bridge, and inputting axle weight parameters into a finite element model to obtain a structure theoretical calculation value;
s7: and comparing and analyzing the response value under the action of the train load with a threshold value, and realizing the real-time evaluation of the bridge structure state.
2. The method for monitoring and evaluating the structural condition of the bridge dedicated to the large-span track according to claim 1, wherein the triggering device in step S4 comprises a central control unit and an infrared camera, the infrared camera is installed on the bridge, and the infrared camera is connected with the central control unit.
3. The method for monitoring and evaluating the structural condition of the special bridge for the large-span track according to claim 1, wherein the axle weight measuring device in the step S6 comprises an obtaining module, which is used for obtaining parameter information of any vehicle in the track train and calculating the resistance suffered by the vehicle according to the parameter information;
the first calculation module is used for obtaining the tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; the second calculation module is used for calculating the acting force of a wheel shaft corresponding to each wheel pair in the vehicle, the resultant force of a coupler suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheel track force;
and the axle weight calculating module is used for calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the resultant force of the car coupler and the transverse force.
4. The method for monitoring and evaluating the structural condition of the bridge special for the large-span track according to claim 3, wherein the method for measuring the axle weight by using the axle weight measuring device in the step S6 comprises the following steps:
(1) Acquiring parameter information of any vehicle in a rail train, and calculating the resistance of the vehicle according to the parameter information;
(2) Obtaining a tangential wheel-rail force corresponding to each wheel pair in the vehicle based on a wheel pair torque equation; calculating the acting force of an axle corresponding to each wheel pair in the vehicle, the resultant force of a coupler suffered by the vehicle and the transverse force of the body of the vehicle to each bogie in the vehicle according to the parameter information, the resistance and the tangential wheeltrack force;
(3) And calculating the axle weight of each axle in the vehicle according to the parameter information, the resistance, the axle acting force, the coupler resultant force and the transverse force.
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| CN202210999656.3A CN115389143A (en) | 2022-08-19 | 2022-08-19 | Method for monitoring and evaluating state of special bridge structure for large-span track |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045893A (en) * | 2022-12-27 | 2023-05-02 | 中冶建筑研究总院有限公司 | Deformation monitoring system and method for key components of steel structure factory building |
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- 2022-08-19 CN CN202210999656.3A patent/CN115389143A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116045893A (en) * | 2022-12-27 | 2023-05-02 | 中冶建筑研究总院有限公司 | Deformation monitoring system and method for key components of steel structure factory building |
| CN116045893B (en) * | 2022-12-27 | 2024-01-09 | 中冶建筑研究总院有限公司 | Deformation monitoring system and method for key components of steel structure factory building |
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