CN116952748A - System and method for monitoring service performance degradation of node plate - Google Patents
System and method for monitoring service performance degradation of node plate Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G01N2203/02—Details not specific for a particular testing method
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The application discloses a node board service performance degradation monitoring system and a monitoring method, wherein the system comprises an ultrasonic transducer, an ultrasonic excitation receiving module, an embedded processing module and a power supply module; the ultrasonic excitation receiving module excites ultrasonic guided waves and longitudinal waves according to a preset mode and frequency, ultrasonic transducers arranged on the surface of the node plate and the tail of the high-strength bolt receive the ultrasonic guided waves and the longitudinal waves, waves transmitted into the node plate and the high-strength bolt are reflected back to the ultrasonic excitation receiving module, the ultrasonic excitation receiving module converts ultrasonic signals into electric frequency signals and transmits the electric frequency signals into the embedded processing module, the embedded processing module carries out noise reduction processing on the signals, and service performance of the node plate and fastening force of the high-strength bolt are evaluated. According to the application, the reliability of the service performance test of the node plate is improved by monitoring the high-strength bolt fastening force of the node plate and the target area. Meanwhile, the node plates with degraded performance and the high-strength bolts with reduced fastening force can be positioned in time, so that support is provided for maintenance decision of a management and maintenance unit.
Description
Technical Field
The application relates to monitoring of a steel structure bridge gusset plate, in particular to a gusset plate service performance degradation monitoring system and a gusset plate service performance degradation monitoring method.
Background
The steel structure bridge gusset plate mainly bears shearing force, and the gusset plate shearing strength is provided by high-strength bolts. The high-strength bolt can clamp the connected plates effectively by applying axial fastening force, so that larger friction force is generated when the high-strength bolt is sheared. The high-strength bolt has the advantages of simple construction, good stress performance, detachability, fatigue resistance and the like, and is a widely used steel structure bridge member in China. However, the steel structure bridge is influenced by factors such as vehicle cyclic reciprocating load, wind load, bolt material failure relaxation and the like in the operation stage, so that the high-strength bolt fastening force of the node plate is reduced, the bearing capacity and rigidity of the local node plate are influenced by the reduction of the high-strength bolt fastening force, when the actual bearing capacity of the node plate is obviously smaller than the design bearing capacity, the brittle failure of the node can be caused, and if the brittle failure of the node plate cannot be found and repaired in time, the damage of the integral structure and even collapse can be caused. In addition, the high-strength bolt fastening force is reduced, so that the high-strength bolt can be loosened and fall off, the risk of smashing pedestrians and traveling vehicles under the bridge occurs, and serious potential safety hazards are brought to lives and properties of people. Therefore, the monitoring of the high-strength bolt tightening force of the steel structure bridge gusset plate in the operation period is enhanced.
At present, the high-strength bolt fastening force is mainly tested by a rotation angle method, a strain measurement method, a reverse pulling method, an ultrasonic longitudinal wave method, an ultrasonic guided wave method, an image method, a piezoresistance method and the like. The rotation angle method is simple to operate, but the torque coefficient is easily influenced by friction coefficients of a threaded surface, a bolt-node plate and a nut-node plate contact surface, so that the measurement error is large. The strain method has higher measurement accuracy, but the visible part of the bolt in the actual bridge is not stressed, and the stressed part cannot be pasted with a strain gauge due to the invisible part, so that the strain gauge is not suitable for checking the screwed bolt. The reverse pulling method has high test precision, but needs to be deployed with a jack, has low test frequency and high cost, is difficult to actually operate, and is not suitable for bridge monitoring application. The ultrasonic longitudinal wave vibration direction is consistent with the propagation direction, so that the method is suitable for testing the normal fastening force of the high-strength bolt, but most waves of the contact bolt are reflected, the transmitted energy is lower, one sensor is often deployed corresponding to one bolt in actual engineering, the monitoring efficiency is low, the hardware and the installation cost are higher, and the large-scale application of the method in the bridge monitoring field is limited. The ultrasonic guided wave can transmit farther in the node plate and the frequency range of the modulated wave is concentrated, more bolts and contact information between the node plate are carried, the node plate can be monitored in a large range only by few sensors, the testing efficiency is high, the sensor cost is low, but the ultrasonic guided wave is mainly propagated along the plate plane and is easily influenced by attachments such as rain and snow on the surface of the node plate, so that misjudgment of the fastening force of the bolts is often caused. The image method has low test cost and high frequency, but when a plurality of bolt fastening forces are reduced, the bolt fastening forces do not rotate, so that serious hysteresis exists in the bolt relaxation test, and real-time early warning of the high-strength bolt fastening force relaxation of the gusset plate cannot be realized. The piezoelectric impedance method has strong anti-interference capability and high sensitivity, but only changes of electric signals can be reflected when the piezoelectric impedance method is in a pressure bearing state, and the piezoelectric impedance method is generally installed together with high-strength bolts in a construction stage and is not suitable for monitoring the fastening force of the high-strength bolts in an operation period.
In addition, the number of the high-strength bolts of the steel structure bridge is large, the loosening of the high-strength bolts is random, at present, some manufacturers adopt a mode of monitoring the bolts one by one, but the mode consumes a large number of sensors, the equipment and installation cost is high, and the large-scale popularization is difficult. Meanwhile, even if a part of the high-strength bolts of the node plates are loosened, the whole bearing capacity of the node plates is not necessarily lower than a design value.
In summary, it is not necessary nor objective to monitor the high strength bolt tightening force one by one within the acceptable range of the load bearing capacity of the gusset plate. Meanwhile, each high-strength bolt fastening force testing method has advantages and disadvantages, and only one testing method is adopted in actual engineering, so that the corresponding disadvantages are caused. In addition, the requirements of the highway bridge and culvert maintenance standard (JTG 5120-2021) 3.5.6 on bolt looseness should be included in the inspection of the upper structure of the steel bridge, the requirements of the highway bridge structure monitoring technical standard (JT/T1037-2022) 11.2.7 on the analysis quantity, the position, the degree and the change trend of high-strength bolt tightening force monitoring data are not provided, the clear regulation of a high-strength bolt tightening force inspection monitoring method and the position is not provided, great confusion is brought to the design personnel of the steel structure bridge inspection and monitoring scheme, and at present, a plurality of steel bridge periodic inspection and health monitoring projects lack of high-strength bolt tightening force inspection and monitoring items, so that great hidden danger is brought to the structural safety.
Disclosure of Invention
The application aims to: aiming at the problems existing in the prior art, the application aims to provide a node plate service performance degradation monitoring system and a node plate service performance degradation monitoring method so as to solve the problem of detection and monitoring of high-strength bolt fastening force of a steel structure bridge, clearly test the node plate, evaluate the service performance of the node plate, promote automation, intellectualization and standardization of detection and monitoring of the high-strength bolt fastening force of the steel bridge, and improve service life and durability level of the steel structure bridge.
The technical scheme is as follows: a node board service performance degradation monitoring system, comprising:
the ultrasonic transducer is deployed on the surface of the gusset plate and at the tail part of the high-strength bolt;
the ultrasonic excitation receiving module excites ultrasonic guided waves and longitudinal waves according to a preset mode and frequency; the ultrasonic transducer receives ultrasonic guided waves and longitudinal waves excited by the ultrasonic excitation receiving module and reflects waves transmitted into the node plate and the high-strength bolt back to the ultrasonic excitation receiving module; the ultrasonic excitation receiving module converts the reflected ultrasonic signals into electric frequency signals and sends the electric frequency signals to the embedded processing module;
the embedded processing module is electrically connected with the ultrasonic excitation receiving module and is used for carrying out noise reduction processing on the electric frequency signals and calculating and evaluating the service performance and the high-strength bolt fastening force of the node plate; and
and the power supply module is used for supplying power to the system.
Specifically, the ultrasonic transducer comprises an ultrasonic waveguide piezoelectric sensor and an ultrasonic longitudinal piezoelectric sensor; preferably, the ultrasonic waveguide piezoelectric sensor is continuously arranged at the middle longitudinal and transverse positions of the key control node plate; the ultrasonic longitudinal piezoelectric sensors are arranged in the target area of the node plate with degraded performance in an interlaced mode. The ultrasonic excitation receiving module comprises an ultrasonic guided wave excitation receiving module and an ultrasonic longitudinal wave excitation receiving module, wherein the ultrasonic guided wave piezoelectric sensor is electrically connected with the ultrasonic guided wave excitation receiving module, and the ultrasonic longitudinal wave piezoelectric sensor is electrically connected with the ultrasonic longitudinal wave excitation receiving module. The embedded processing module comprises a signal preprocessing module, and the signal preprocessing module is respectively and electrically connected with the ultrasonic guided wave excitation receiving module and the ultrasonic longitudinal wave excitation receiving module and is used for carrying out noise reduction processing on the electric frequency signals.
Further, the embedded processing module comprises a node plate fastening force calculation module, a node plate service performance evaluation module, a high-strength bolt fastening force calculation module and a high-strength bolt fastening force evaluation module;
the node plate fastening force calculation module is electrically connected with the signal preprocessing module, and the node plate fastening force is determined according to the ultrasonic waveguide energy; the node plate service performance evaluation module is electrically connected with the node plate fastening force calculation module, and the node plate service performance evaluation is carried out according to the node plate fastening force; the high-strength bolt fastening force calculation module is electrically connected with the signal preprocessing module, and the high-strength bolt fastening force is determined according to the ultrasonic longitudinal wave sound time difference; the high-strength bolt fastening force evaluation module is electrically connected with the high-strength bolt fastening force calculation module, and high-strength bolt fastening force evaluation is carried out according to the high-strength bolt fastening force.
Further, the system also comprises a wireless communication module which is respectively and electrically connected with the service performance evaluation module and the high-strength bolt fastening force evaluation module of the node plate and is used for sending evaluation results of the service performance and the high-strength bolt fastening force of the node plate. In addition, the system also comprises a visual terminal which is in communication connection with the wireless communication module and is used for displaying the service performance of the node plate and the evaluation result of the high-strength bolt fastening force.
Further, the system also includes a memory module.
A monitoring method based on the node plate service performance degradation monitoring system comprises the following steps:
1) Selecting the shear strength and the high-strength bolt fastening force of a node plate as evaluation indexes of node performance degradation, wherein the shear strength of the node plate is jointly provided by a plurality of high-strength bolt fastening forces on one node plate and is used for resisting shearing force;
2) Carrying out a finite element simulation model on a bridge structure, and determining key control nodes of the whole bridge on the principle of maximum stress and maximum vibration mode curvature;
3) Dividing the performance degradation level of the node into a plurality of levels according to the percentages of different degrees of deviation by taking the finite element shear force calculation result at the key control node as a reference;
4) Dividing the high-strength bolt tightening force of the gusset plate into a plurality of grades according to the percentage of the high-strength bolt tightening force of the gusset plate which is reduced by different degrees;
5) Calibrating the normal working state and the failure state of the node plate and the high-strength bolt by using an ultrasonic guided wave method and an ultrasonic longitudinal wave method respectively, and performing temperature compensation; constructing a node plate and a high-strength bolt tightening force monitoring base line;
6) Determining the fastening force of the node plate according to the received ultrasonic wave energy, and evaluating the service performance of the node plate;
7) Determining a node performance threshold according to the node performance degradation grade, the node plate high-strength bolt fastening force grade and the node plate and high-strength bolt fastening force monitoring base line, defining a region with service performance lower than the node performance threshold as a node plate target region, calculating and evaluating the high-strength bolt fastening force of the region according to the received ultrasonic longitudinal wave acoustic time difference, and locally positioning the bolt with reduced fastening force.
Compared with the prior art, the application has the following beneficial effects:
the method and the device avoid subjectivity of the service performance test of the node plate, enlarge the test range by monitoring the high-strength bolt fastening force of the node plate and the target area, improve the test efficiency, replace the traditional mode of monitoring the high-strength bolt fastening force in a large-scale single point, greatly reduce the number and cost of the sensor, and improve the reliability of the service performance test of the node plate. Meanwhile, the monitoring system can realize data acquisition, analysis and wireless transmission at the edge side, solves the problem of traditional cloud service delay, can timely position the node plates with degraded performance and the high-strength bolts with reduced fastening force, and provides support for maintenance decision of a management and maintenance unit.
Drawings
FIG. 1 is a schematic block diagram of a system for monitoring degradation of service performance of a node board according to an embodiment of the present application;
FIG. 2 is a flowchart illustrating a method for monitoring service performance degradation of a node board according to an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
Referring to fig. 1, a node board service performance degradation monitoring system includes an ultrasonic transducer, an ultrasonic excitation receiving module, an embedded processing module, and a power module.
The ultrasonic transducer is arranged on the surface of the gusset plate and at the tail of the high-strength bolt, and comprises an ultrasonic waveguide piezoelectric sensor and an ultrasonic longitudinal piezoelectric sensor. The ultrasonic excitation receiving module comprises an ultrasonic guided wave excitation receiving module and an ultrasonic longitudinal wave excitation receiving module, wherein the ultrasonic guided wave piezoelectric sensor is electrically connected with the ultrasonic guided wave excitation receiving module, and the ultrasonic longitudinal wave piezoelectric sensor is electrically connected with the ultrasonic longitudinal wave excitation receiving module. Preferably, the ultrasonic longitudinal wave piezoelectric sensor is adsorbed on the magnetic attraction contact, and is electrically connected with the ultrasonic excitation receiving module through the magnetic attraction contact, and the magnetic attraction contact is used as an auxiliary mounting device to support quick disassembly.
The embedded processing module mainly comprises a signal preprocessing module, a node plate fastening force calculation module, a node plate service performance evaluation module, a high-strength bolt fastening force calculation module and a high-strength bolt fastening force evaluation module.
The ultrasonic excitation receiving module excites ultrasonic guided waves and longitudinal waves according to a preset mode and frequency; the ultrasonic transducer receives ultrasonic guided waves and longitudinal waves, waves transmitted into the node plate and the high-strength bolt are reflected back to the ultrasonic excitation receiving module, the ultrasonic excitation receiving module converts ultrasonic signals into electric frequency signals, the signals are transmitted into the embedded processing module, the embedded processing module carries out noise reduction processing on the signals, and service performance of the node plate and fastening force of the high-strength bolt are evaluated.
The node plate fastening force calculation module is electrically connected with the signal preprocessing module, and the node plate fastening force is determined according to the ultrasonic waveguide energy; the node plate service performance evaluation module evaluates the node plate service performance according to the node plate fastening force provided by the node plate fastening force calculation module.
Specifically, the ultrasonic waveguide energy E is calculated according to the electric frequency signal, and the calculation formula is as follows:
E＝0.5×ρ×v×A×f 2 ×s 2
where E is the energy of the ultrasonic guided wave, ρ is the density of the medium, v is the propagation speed of the ultrasonic guided wave in the medium, a is the propagation area of the ultrasonic guided wave, f is the frequency of the ultrasonic guided wave, and s is the amplitude of the ultrasonic guided wave.
Because the ultrasonic guided wave energy transmitted through the bolting interface is closely related to the contact state of the bonding surface, the transmitted guided wave energy can be directly utilized as an index for detecting the high-strength bolting force, and the method is also called a guided wave energy dissipation method. The shear strength of the gusset is provided by a plurality of high strength bolt tightening forces on one gusset. If the node performance of a certain area is degraded below the node performance threshold, the position of the bolt with reduced fastening force in the area needs to be further locally positioned.
The high-strength bolt fastening force calculation module is electrically connected with the signal preprocessing module, and the high-strength bolt fastening force is determined according to the ultrasonic longitudinal wave sound time difference; the high-strength bolt fastening force evaluation module evaluates the high-strength bolt fastening force according to the high-strength bolt fastening force provided by the high-strength bolt fastening force calculation module.
The high-strength bolt tightening force is calculated as follows:
wherein sigma is the axial stress in the bolt, K L To fasten the axial force T L0 Is the propagation time of ultrasonic longitudinal wave in the bolt in the stress-free state, T L Is the propagation time of ultrasonic longitudinal wave in the bolt under the sigma stress state.
Preferably, the system further comprises a wireless communication module for remotely sending out the evaluation result of the embedded processing module. Preferably, the evaluation result can be sent to a visualization terminal for display.
Further preferably, the system further comprises a storage module for providing storage space for the operation data.
Based on the monitoring system, the application also provides a node board service performance degradation monitoring method, which comprises the following steps:
1) The shear strength and the high-strength bolt fastening force of the node plates are selected as evaluation indexes of node performance degradation, and the shear strength of the node plates is jointly provided by a plurality of high-strength bolt fastening forces on one node plate and is used for resisting shearing force.
2) And (3) establishing a real bridge finite element simulation model, and analyzing the integral stress performance and vibration mode change trend of the components connected with the node plates and the structure under the action of vehicle load and wind load under the conditions that the bearing capacity of the node plates of the main stress components of the bridge structure is degraded by 5%, 10%, 15%, 20%, 25% and 30%, and determining the key control nodes of the whole bridge by taking the principle of maximum stress and maximum vibration mode curvature.
3) And dividing the performance degradation level of the node into 5 levels according to the deviation of 5%, 10%, 15%, 20% and more respectively based on the finite element shear force calculation result at the key control node.
4) According to the rule of annex H.1.3 of the manufacturing and installation construction standards of highway steel structure bridges (JTG/T3651-2022), the high-strength bolt fastening force of the gusset plate is reduced by 5%, 10%, 15%, 20%, 25% and 30%, and is classified into 5 grades.
5) Calibrating the normal working state and the failure state of the node board by using an ultrasonic guided wave method; calibrating the normal working state and the failure state of the high-strength bolt by using an ultrasonic longitudinal wave method, and performing temperature compensation; and constructing a node plate and a high-strength bolt tightening force monitoring base line.
6) And continuously pasting a plurality of ultrasonic transducers longitudinally and transversely in the middle of the key control node board, connecting the ultrasonic transducers to a node board fastening force calculation module and a node board service performance evaluation module, and carrying out quick region test on the fastening force of the whole node board.
7) Determining a node performance threshold based on the node performance degradation level, the node plate high-strength bolt fastening force level and the node plate and high-strength bolt fastening force monitoring base line, and judging whether a node plate area with performance degradation lower than the node performance threshold exists; if the bolt tightening force monitoring device is in existence, the area is divided into a target area of the gusset plate, and high-strength bolt tightening force monitoring is carried out on the target area of the gusset plate. Preferably, a plurality of ultrasonic longitudinal wave piezoelectric sensors are arranged in an interlaced mode in a target area of the gusset plate, each ultrasonic longitudinal wave piezoelectric sensor is independently connected with a test channel, and is connected to the high-strength bolt fastening force calculation module and the high-strength bolt fastening force evaluation module to position bolts with reduced local fastening force. In order to realize quick disassembly, the ultrasonic longitudinal wave probe can be arranged in a magnetic attraction mode.
8) After the high-strength bolt fastening force of the target area of the node plate is monitored to be reduced, early warning information is sent out, data support is provided for the repair screwing of the high-strength bolt by a management and maintenance unit, the service level of the node plate is improved, and the structural safety operation risk is reduced.
In summary, the application realizes the rapid test of the normal fastening force of the whole node plate by ultrasonic guided wave, monitors the change trend of the long-term service performance of the node plate, and evaluates the service performance of the node plate. Meanwhile, high-strength bolts with reduced fastening force of the local node plates are monitored through an ultrasonic longitudinal wave method, misjudgment of an ultrasonic guided wave method is reduced, reliability of service performance evaluation of the node plates is improved, support is provided for maintenance decision of a maintenance unit, safety operation risk of the structure is reduced, and the method is suitable for monitoring service performance of the node plates assembled by the steel truss and the segmental steel box girder. Meanwhile, the system can realize data acquisition, storage, analysis and wireless transmission at the edge side, solves the problem of traditional cloud service delay, can timely position the node plate with degraded performance and the high-strength bolt with reduced fastening force, and sends out early warning information.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A node board service performance degradation monitoring system, comprising:
the ultrasonic transducer is deployed on the surface of the gusset plate and at the tail part of the high-strength bolt;
the ultrasonic excitation receiving module excites ultrasonic guided waves and longitudinal waves according to a preset mode and frequency; the ultrasonic transducer receives ultrasonic guided waves and longitudinal waves excited by the ultrasonic excitation receiving module and reflects waves transmitted into the node plate and the high-strength bolt back to the ultrasonic excitation receiving module; the ultrasonic excitation receiving module converts the reflected ultrasonic signals into electric frequency signals and sends the electric frequency signals to the embedded processing module;
the embedded processing module is electrically connected with the ultrasonic excitation receiving module and is used for carrying out noise reduction processing on the electric frequency signals and calculating and evaluating the service performance and the high-strength bolt fastening force of the node plate; and
and the power supply module is used for supplying power to the system.
2. The method for monitoring the node plate service performance degradation monitoring system according to claim 1, wherein the ultrasonic transducer comprises an ultrasonic waveguide piezoelectric sensor and an ultrasonic longitudinal piezoelectric sensor.
3. The method for monitoring the service performance degradation monitoring system of the node board according to claim 2, wherein the ultrasonic waveguide piezoelectric sensor is continuously deployed at the middle longitudinal and transverse positions of the key control node board; the ultrasonic longitudinal piezoelectric sensors are arranged in the target area of the node plate with degraded performance in an interlaced mode.
4. The method for monitoring the degradation monitoring system of the service performance of the node board according to claim 2, wherein the ultrasonic excitation receiving module comprises an ultrasonic guided wave excitation receiving module and an ultrasonic longitudinal wave excitation receiving module, the ultrasonic guided wave piezoelectric sensor is electrically connected with the ultrasonic guided wave excitation receiving module, and the ultrasonic longitudinal wave piezoelectric sensor is electrically connected with the ultrasonic longitudinal wave excitation receiving module.
5. The method for monitoring the service performance degradation monitoring system of the node board according to claim 4, wherein the embedded processing module comprises a signal preprocessing module, and the signal preprocessing module is electrically connected with the ultrasonic guided wave excitation receiving module and the ultrasonic longitudinal wave excitation receiving module respectively and is used for carrying out noise reduction processing on the electric frequency signals.
6. The method for monitoring the service performance degradation monitoring system of the gusset plate according to claim 5, wherein the embedded processing module comprises a gusset plate fastening force calculation module, a gusset plate service performance evaluation module, a high-strength bolt fastening force calculation module and a high-strength bolt fastening force evaluation module;
the node plate fastening force calculation module is electrically connected with the signal preprocessing module, and the node plate fastening force is determined according to the ultrasonic waveguide energy;
the node plate service performance evaluation module is electrically connected with the node plate fastening force calculation module, and the node plate service performance evaluation is carried out according to the node plate fastening force;
the high-strength bolt fastening force calculation module is electrically connected with the signal preprocessing module, and the high-strength bolt fastening force is determined according to the ultrasonic longitudinal wave sound time difference;
the high-strength bolt fastening force evaluation module is electrically connected with the high-strength bolt fastening force calculation module, and high-strength bolt fastening force evaluation is carried out according to the high-strength bolt fastening force.
7. The method for monitoring the service performance degradation monitoring system of the node plate according to claim 6, comprising a wireless communication module electrically connected with the service performance evaluation module of the node plate and the high-strength bolt tightening force evaluation module respectively, and used for sending evaluation results of the service performance of the node plate and the high-strength bolt tightening force.
8. The method for monitoring the service performance degradation monitoring system of the node board according to claim 7, wherein the method comprises the step of enabling the visual terminal to be in communication connection with the wireless communication module and used for displaying the evaluation results of the service performance and the high-strength bolt fastening force of the node board.
9. The method for monitoring the node board service performance degradation monitoring system according to claim 1, comprising a storage module.
10. A monitoring method based on the node board service performance degradation monitoring system as claimed in any one of claims 1 to 9, comprising the steps of:
1) Selecting the shear strength and the high-strength bolt fastening force of a node plate as evaluation indexes of node performance degradation, wherein the shear strength of the node plate is jointly provided by a plurality of high-strength bolt fastening forces on one node plate and is used for resisting shearing force;
2) Carrying out a finite element simulation model on a bridge structure, and determining key control nodes of the whole bridge on the principle of maximum stress and maximum vibration mode curvature;
3) Dividing the performance degradation level of the node into a plurality of levels according to the percentages of different degrees of deviation by taking the finite element shear force calculation result at the key control node as a reference;
4) Dividing the high-strength bolt tightening force of the gusset plate into a plurality of grades according to the percentage of the high-strength bolt tightening force of the gusset plate which is reduced by different degrees;
5) Calibrating the normal working state and the failure state of the node plate and the high-strength bolt by using an ultrasonic guided wave method and an ultrasonic longitudinal wave method respectively, and performing temperature compensation; constructing a node plate and a high-strength bolt tightening force monitoring base line;
6) Determining the fastening force of the node plate according to the received ultrasonic wave energy, and evaluating the service performance of the node plate;
7) Determining a node performance threshold according to the node performance degradation grade, the node plate high-strength bolt fastening force grade and the node plate and high-strength bolt fastening force monitoring base line, defining a region with service performance lower than the node performance threshold as a node plate target region, calculating and evaluating the high-strength bolt fastening force of the region according to the received ultrasonic longitudinal wave acoustic time difference, and locally positioning the bolt with reduced fastening force.
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| CN117554218A (en) * | 2024-01-12 | 2024-02-13 | 苏交科集团股份有限公司 | Straight asphalt pouring type steel bridge surface composite beam test piece fatigue test device and method |
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| CN117554218A (en) * | 2024-01-12 | 2024-02-13 | 苏交科集团股份有限公司 | Straight asphalt pouring type steel bridge surface composite beam test piece fatigue test device and method |
| CN117554218B (en) * | 2024-01-12 | 2024-03-22 | 苏交科集团股份有限公司 | Straight asphalt pouring type steel bridge surface composite beam test piece fatigue test device and method |
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