CN110824150B - Automatic monitoring and early warning system for debonding of steel pipe concrete arch rib - Google Patents
Automatic monitoring and early warning system for debonding of steel pipe concrete arch rib Download PDFInfo
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- CN110824150B CN110824150B CN201911195681.0A CN201911195681A CN110824150B CN 110824150 B CN110824150 B CN 110824150B CN 201911195681 A CN201911195681 A CN 201911195681A CN 110824150 B CN110824150 B CN 110824150B
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Abstract
The invention relates to the technical field of bridge monitoring, in particular to an automatic monitoring and early warning system for debonding of a concrete filled steel tube arch rib, which comprises an arch rib, a sensor module, a data processing and analyzing module, an early warning value setting module and a monitoring module, wherein the arch rib comprises a steel tube and concrete; the sensor modules are arranged on monitoring sections in arch ribs, each sensor module of each monitoring section comprises a concrete strain gauge, a steel pipe strain gauge and a temperature sensor, the number of the concrete strain gauges is five, and the five concrete strain gauges are embedded in the concrete; the steel tube strain gauges and the temperature sensors are respectively arranged and are fixedly arranged on the outer walls of the steel tubes; and the data processing and analyzing module is used for calculating the radial bonding stress between the inner wall of the steel pipe and the concrete. The invention can monitor the radial bonding stress between the steel pipe and the concrete in the pipe in real time and discover the debonding condition of the steel pipe concrete in time.
Description
Technical Field
The invention relates to the technical field of bridge monitoring, in particular to an automatic monitoring and early warning system for debonding of a concrete filled steel tube arch rib.
Background
The steel pipe concrete structure is widely applied to engineering due to good acceptance performance, but most steel pipe concrete structures have a debonding phenomenon due to the inconsistent deformation of steel pipe and concrete under the action of temperature and the influence of shrinkage and creep of concrete. At present, most of the traditional steel pipe concrete arch rib debonding detection methods are carried out in a manual regular inspection mode, on one hand, the method needs to manually collect a large amount of field monitoring data, which is easily influenced by environmental factors, and the collected data is usually data points at a certain time point and has no continuity; on the other hand, the detection mode of manual regular inspection easily leaks important or dangerous data information, and usually, detection and evaluation are performed after special conditions such as safety problems occur to the structure, so that corresponding treatment measures cannot be taken in time after the concrete-filled steel tube member is debonded.
Disclosure of Invention
In order to solve the problems, the invention provides an automatic monitoring and early warning system for debonding of a steel pipe concrete arch rib, which can monitor the radial bonding stress between a steel pipe and concrete in the pipe in real time and discover the debonding condition of the steel pipe concrete in time.
In order to achieve the purpose, the invention adopts the technical scheme that:
an automatic monitoring and early warning system for debonding of a steel pipe concrete arch rib comprises the arch rib, a sensor module, a data acquisition module, a data processing and analyzing module, an early warning value setting module and a monitoring module, wherein the arch rib comprises a steel pipe and concrete, and the concrete is poured in the steel pipe;
the sensor modules are arranged on monitoring sections in arch ribs, each sensor module of each monitoring section comprises a plurality of concrete strain gauges, a plurality of steel pipe strain gauges and a temperature sensor, and the plurality of concrete strain gauges are embedded in the concrete at intervals; the steel tube strain gauges and the temperature sensors are respectively arranged and are fixedly arranged on the outer walls of the steel tubes;
the data acquisition module is used for acquiring data of the concrete strain gauge, the steel pipe strain gauge and the temperature sensor;
the data processing and analyzing module is used for calculating the radial bonding stress between the inner wall of the steel pipe and the concrete in the arch rib, and the calculation formula of the radial bonding stress is as follows:
in the formula, σbThe radial bonding stress between the inner wall of the steel pipe and the concrete; alpha is alphasIs the linear expansion coefficient of the steel pipe; mu.ssThe poisson ratio of the steel pipe; esThe elastic modulus of the steel pipe; b is the outer diameter of the steel pipe, and a is the inner diameter of the steel pipe;
Δtsis the surface temperature difference of the steel pipe, and Δ ts＝ts-t0Wherein t issThe monitored temperature, t, of the steel pipe obtained by the temperature sensor0The initial temperature of the steel pipe obtained by the temperature sensor;
Δεsis the difference in axial strain of the steel pipe, and iss＝εs-εs0In which epsilonsObtaining a monitored axial strain value, ε, of the steel pipe for the steel pipe strain gauges0Obtaining an initial axial strain value of the steel pipe for the steel pipe strain gauge;
Δεcis the difference in radial strain of the concrete, andc＝εc-εc0in which epsiloncIs the average value of the monitored radial strain, epsilon, of the concretec＝(εc1+εc2+εc3+εc4+εc5+...+εcn)/n，εc1～εcnMonitoring radial strain values acquired by a plurality of concrete strain gauges respectively; epsilonc0Is the average value of the initial radial strain, epsilon, of the concretec0＝(εc1,0+εc2,0+εc3,0+εc4,0+...+εcn,0)/n，εc1,0～εcn,0The initial radial strain values are acquired by a plurality of concrete strain gauges respectively;
the early warning value setting module is used for setting an early warning value;
the monitoring module is used for monitoring the debonding of the arch rib and comprises a debonding alarm submodule, the debonding alarm submodule is used for acquiring the data of the data processing and analyzing module and the data of the early warning value setting module, and when the radial bonding stress between the inner wall of the steel pipe and the concrete in the data processing and analyzing module is larger than or equal to the early warning value in the early warning value setting module, the debonding alarm submodule sends out alarm information.
Further, the monitoring sections include a rib foot section, an 1/4 span section, and a dome section located at the rib.
Furthermore, five concrete strain gauges are arranged on each monitoring section, one concrete strain gauge is located at the axis of the inner portion of the steel pipe, the other four concrete strain gauges are located in two orthogonal directions of the diameter of the steel pipe, and the four concrete strain gauges are arranged at equal intervals in the radial direction.
Further, the steel pipe strain gauge and the temperature sensor adopt vibrating wire type surface strain gauges.
Further, the concrete strain gauge adopts a vibrating wire type embedded strain gauge.
Further, the data acquisition module performs data transmission with the data processing and analyzing module in a wireless transmission mode.
The monitoring module further comprises a model establishing submodule, the model establishing submodule is used for establishing a model for the arch rib through modeling software so as to generate an arch rib model, the model establishing submodule can acquire data of the sensor module and the data processing and analyzing module, and records monitoring values and initial value records of a concrete strain gauge, a steel pipe strain gauge and a temperature sensor and radial bonding stress between the inner wall of the steel pipe and the concrete on the corresponding monitoring section in the arch rib model.
Further, the model building submodule can also obtain data of the debonding alarm submodule, and when the radial bonding stress between the inner wall of the steel pipe of the monitoring section and the concrete is larger than or equal to an early warning value, the model building submodule can display the corresponding monitoring section in a vivid color in the arch rib model.
Furthermore, the monitoring module also comprises a chart generation submodule which can acquire data of the sensor module and the data processing and analyzing module, record monitoring values and initial values of a concrete strain gauge, a steel pipe strain gauge and a temperature sensor and radial bonding stress between the inner wall of the steel pipe and the concrete, and generate a process chart of time, stress and temperature.
Further, it is characterized in that: the monitoring module further comprises a safety suggestion submodule, the safety suggestion submodule is used for storing defect treatment measures in the bridge construction and operation and maintenance stages, the safety suggestion submodule can also acquire data of the debonding alarm submodule to judge the position of the debonded monitored cross section at the arch rib, and the monitoring module can match the position of the debonded arch rib of the monitored cross section with data of the debonding defect prevention measures in the bridge construction and operation and maintenance stages to acquire prevention measure attention matters related to the position of the debonded monitored cross section.
The invention has the beneficial effects that:
1. the temperature sensor and the steel pipe strain gauge are arranged on the surface of the steel pipe, so that the temperature data and the axial stress data of the steel pipe can be acquired in real time, and the concrete strain gauge is arranged in the concrete, so that the radial stress of the concrete can be acquired in real time; under the effect of data processing and analysis module, with the concrete strain gauge, steel pipe strainmeter and the initial axial stress of the concrete that temperature sensor measured and obtained and monitoring axial stress, the initial temperature value of steel pipe, initial axial strain, monitoring temperature value and monitoring axial strain, substitute in the formula, thereby can obtain the radial bonding stress between steel pipe inner wall and the concrete, compare radial bonding stress and the early warning value of early warning value setting module, when radial bonding stress is greater than or equal to the early warning value, prove that the steel pipe concrete is in the debonding state. Therefore, the defect that a large amount of manpower and material resources are required for manual inspection is overcome, the monitoring efficiency is improved, and the labor cost is reduced; meanwhile, whether the concrete filled steel tube is in a debonding state or not can be found in time, so that workers can perform safety assessment on the debonding condition or develop corresponding treatment measures in time, and detection and assessment on the debonding condition of the concrete filled steel tube after the safety problem of the structure occurs are avoided.
2. Because one concrete strain gauge is positioned at the axis in the steel pipe, the other four concrete strain gauges are positioned in two orthogonal directions of the diameter of the steel pipe, and the four concrete strain gauges are arranged at equal intervals along the radial direction, the five concrete strain gauges can obtain the radial strain of different positions in the monitoring section, and the average strain value of the concrete of the monitoring section can be accurately calculated.
3. Under the action of the model establishing submodule, the arch rib can be modeled to generate a model of the arch rib, so that workers can acquire data of each sensor on a monitoring section in the arch rib model, and the analysis of the debonding condition of the arch rib by the workers is facilitated. And when the radial bonding stress between the inner wall of the steel pipe of the monitoring section and the concrete is greater than or equal to the early warning value, the model building submodule can display the corresponding monitoring section in a bright color in the arch rib model, so that a worker can find the monitoring section to be in a debonding state in time, and the worker can rapidly process the debonding problem.
Drawings
Fig. 1 is a block diagram illustrating an automatic monitoring and warning system for debonding a steel pipe concrete arch rib according to a preferred embodiment of the present invention.
Fig. 2 is a schematic view of a monitoring cross-sectional structure of an automatic monitoring and warning system for debonding of a steel pipe concrete arch rib according to a preferred embodiment of the present invention.
In the figure, 1-a sensor module, 11-a concrete strain gauge, 12-a steel pipe strain gauge, 13-a temperature sensor, 2-a data acquisition module, 3-a data processing and analysis module, 4-an early warning value setting module, 5-a monitoring module, 51-a debonding alarm submodule, 52-a model establishing submodule, 53-a chart generating submodule, 54-a safety suggestion submodule, 61-a steel pipe and 62-concrete.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, an automatic monitoring and early warning system for debonding of a steel pipe concrete arch rib according to a preferred embodiment of the present invention includes an arch rib, a sensor module 1, a data acquisition module 2, a data processing and analyzing module 3, an early warning value setting module 4, and a monitoring module 5.
The arch rib comprises a steel pipe 61 and concrete 62, and the concrete 62 is poured in the steel pipe 61.
The sensor module 1 is arranged on a monitoring section in an arch rib, the sensor module 1 of each monitoring section comprises a plurality of concrete strain gauges 11, a plurality of steel pipe strain gauges 12 and a temperature sensor 13, and the plurality of concrete strain gauges 11 are embedded in concrete 62 at intervals; one steel pipe strain gauge 12 and one temperature sensor 13 are provided, and are both fixedly provided on the outer wall of the steel pipe 61. In this embodiment, the steel pipe strain gauge 12 and the temperature sensor 13 are vibrating wire surface strain gauges; the concrete strain gauge 11 adopts a vibrating wire type embedded strain gauge.
In this embodiment, the monitoring sections include a rib toe section, an 1/4 span section, and a dome section located at the rib. Since concrete filled steel tubes in the arch springing section, the 1/4 span section and the vault section of the arch rib are easy to be debonded, the sensor arrangement of the embodiment on the monitoring section can obtain effective sensor data.
In this embodiment, there are five concrete strain gauges 11 in each monitoring section, one concrete strain gauge 11 is located at the inner axis of the steel pipe 61, the remaining four concrete strain gauges 11 are located in two orthogonal directions of the diameter of the steel pipe 61, and the four concrete strain gauges 11 are arranged at equal intervals along the radial direction. Because the concrete strain gauges 11 are uniformly arranged on the monitoring section, the five concrete strain gauges can obtain the radial strain of different positions in the monitoring section, so that the average strain value of the concrete of the monitoring section can be accurately calculated, and the accuracy of the radial strain measured by the concrete 62 on the monitoring section is ensured.
The data acquisition module 2 is used for acquiring data of the concrete strain gauge 11, the steel pipe strain gauge 12 and the temperature sensor 13. Under the action of the data acquisition module 2, data of a temperature sensor and a steel pipe strain gauge arranged on the surface of the steel pipe 61 can be acquired, so that an initial temperature value, an initial axial strain force, a monitoring temperature value and a monitoring axial strain force of the steel pipe 61 are obtained; data from the concrete strain gauges 11 within the concrete can also be collected to obtain an initial axial stress of the concrete 62 and to monitor the axial stress to provide the necessary parameters for subsequent concrete filled steel tube debonding calculations.
The data processing and analyzing module 3 is used for calculating the radial bonding stress between the inner wall of the steel tube 61 and the concrete 62 in the arch rib, and the calculation formula of the radial bonding stress is as follows:
in the formula, σbIs the radial bonding stress between the inner wall of the steel tube 61 and the concrete 62; alpha is alphasIs the linear expansion coefficient of the steel pipe; mu.ssThe poisson ratio of the steel pipe; esThe elastic modulus of the steel pipe; b is the outer diameter of the steel tube 61, and a is the inner diameter of the steel tube 61;
Δtsis the surface temperature difference of the steel pipe 61, and Δ ts＝ts-t0Wherein t issThe monitored temperature, t, of the steel pipe 61 obtained by the temperature sensor 130The initial temperature of the steel pipe 61 obtained by the temperature sensor 13;
Δεsis the difference in axial strain of the steel pipe 61, and is Δ εs＝εs-εs0In which epsilonsMonitored axial strain value, ε, of steel pipe 61 obtained for steel pipe strain gauge 12s0The initial axial strain value of the steel pipe 61 obtained for the steel pipe strain gauge 12;
Δεcis the difference in radial strain of the concrete 62, and isc＝εc-εc0In which epsiloncAverage value of monitored radial strain, ε, for concrete 62c＝(εc1+εc2+εc3+εc4+εc5+...+εcn)/n，εc1～εcnThe radial strain values are respectively acquired and obtained by a plurality of concrete strain gauges 11; epsilonc0Is the average value of the initial radial strain, ε, of the concrete 62c0＝(εc1,0+εc2,0+εc3,0+εc4,0+...+εcn,0)/n，εc1,0～εcn,0The initial radial strain values obtained for the respective acquisition by the plurality of concrete strain gauges 11.
In this embodiment, the data acquisition module 2 performs data transmission with the data processing and analysis module 3 in a wireless transmission manner, so that the arrangement of wires can be reduced, the attractiveness of the arch rib is improved, and remote monitoring can be realized.
The early warning value setting module 4 is used for setting an early warning value. Preferably, the early warning value is critical bonding strength [ sigma ]b]，[σb]The empirical value of (A) is 0.86-1.24 MPa.
The monitoring module 5 is used for monitoring the rib debonding, and comprises a debonding alarm submodule 51, the debonding alarm submodule 51 is used for acquiring data of the data processing and analyzing module 3 and data of the early warning value setting module 4, and when the radial bonding stress between the inner wall of the steel pipe 61 in the data processing and analyzing module 3 and the concrete 62 is greater than or equal to the early warning value in the early warning value setting module 4, the debonding alarm submodule 51 sends out alarm information.
In this embodiment, when σb<[σb]When the alarm is not sent, the debonding alarm submodule 51 does not send alarm information; when sigma isb≥[σb]In time, the debonding alarm submodule 51 issues alarm information.
Under the effect of data processing and analysis module 3, initial axial stress and monitoring axial stress of concrete 62 that obtains with concrete strain gauge 11, steel pipe strainometer 12 and temperature sensor 13 measurement, the initial temperature value of steel pipe 61, initial axial strain, monitoring temperature value and monitoring axial strain, substitute in formula 1, thereby can obtain the radial bonding stress between steel pipe 61 inner wall and concrete 62, radial bonding stress and the early warning value of early warning value setting module carry out the comparison, when radial bonding stress is greater than or equal to the early warning value, prove that the steel pipe concrete is in the debonding state. Therefore, the defect that a large amount of manpower and material resources are required for manual inspection is overcome, the monitoring efficiency is improved, and the labor cost is reduced; meanwhile, whether the concrete filled steel tube is in a debonding state or not can be found in time, so that workers can perform safety assessment on the debonding condition or develop corresponding treatment measures in time, and detection and assessment on the debonding condition of the concrete filled steel tube after the safety problem of the structure occurs are avoided.
In this embodiment, the data processing and analyzing module 3 and the warning value setting module 4 are implemented by computer programs, and the formula calculation and the triggering conditions are both in the prior art.
In this embodiment, the monitoring module 5 further includes a model building sub-module 52, a chart generating sub-module 53, and a safety suggestion sub-module 54.
The model building submodule 52 is used for modeling the arch rib through modeling software to generate an arch rib model, and the model building submodule 52 can acquire data of the sensor module 1 and the data processing and analyzing module 3, and records monitoring values and initial values of the concrete strain gauge 11, the steel pipe strain gauge 12 and the temperature sensor 13 and radial bonding stress between the inner wall of the steel pipe 61 and the concrete 62 on a corresponding monitoring section in the arch rib model.
The model building submodule 52 can also acquire data of the debonding alarm submodule 51, and when the radial adhesive stress between the inner wall of the steel pipe 61 of the monitoring section and the concrete 62 is greater than or equal to the early warning value, the model building submodule 52 can display the corresponding monitoring section in the rib model in a vivid color.
Under the action of the model establishing submodule 52, the arch rib can be modeled to generate a model of the arch rib, so that the staff can acquire data of each sensor on a monitoring section in the arch rib model, and the staff can conveniently analyze the debonding condition of the arch rib. And when the radial bonding stress between the inner wall of the steel pipe of the monitoring section and the concrete is greater than or equal to the early warning value, the model building submodule can display the corresponding monitoring section in a bright color in the arch rib model, so that a worker can find the monitoring section to be in a debonding state in time, and the worker can rapidly process the debonding problem.
The graph generation sub-module 53 can acquire data of the sensor module 1 and the data processing and analyzing module 3, and generate a time, stress and temperature process graph by recording the monitoring values and initial values of the concrete strain gauge 11, the steel pipe strain gauge 12 and the temperature sensor 13 and the radial bonding stress between the inner wall of the steel pipe 61 and the concrete 62.
Under the action of the chart generation submodule 53, a change process chart can be generated by monitoring the temperature value and the axial stress value of the steel pipe 61 in the section, the radial stress average value of the concrete 62 and the radial stress value of the concrete 62 at the position corresponding to the concrete strain gauge 11, so that a worker can analyze the condition of the arch rib according to the process chart, and can quickly observe the sudden change value through the process chart, so that an analysis and response scheme can be made for the condition of the numerical value sudden change, and the occurrence of concrete-filled steel pipe debonding can be prevented.
The safety suggestion submodule 54 is used for storing defect treatment measures in the bridge construction and operation and maintenance stages, the safety suggestion submodule 54 can also obtain data of the debonding alarm submodule 51 so as to judge the position of the debonded monitoring section in the arch rib, and the monitoring module 5 can match the arch rib position of the debonded monitoring section with data of the debonding defect prevention and treatment measures in the bridge construction and operation and maintenance stages so as to obtain prevention and treatment measure cautions related to the position of the debonded monitoring section. When treating concrete filled steel tube debonding, the workman need take different prevention measures according to the debonding degree of rib, and monitoring module 5 of this embodiment matches suitable debonding prevention and control measure in the safety suggestion submodule according to the monitoring cross-section that needs to be administered is located the position of rib and the debonding degree of rib, reminds the workman the problem of required attention when administering, ensures that the debonding cross-section is closely knit again.
The monitoring process of the automatic monitoring and early warning system for debonding of the steel pipe concrete arch rib to the arch springing in the arch rib is as follows:
s1, a concrete strain gauge 11 and a steel pipe strain gauge12 and 13, collecting data of the sensors on the monitoring section through the data collection module 2 after the sensors are arranged, and taking the value of the strain stable change moment as an initial value. Wherein, in the monitoring section of the arch springing, the initial values of the five concrete strain gauges 11 are respectively epsilonc1,0、εc2,0、εc3,0、εc4,0And epsilonc5,0According to epsilonc0＝(εc1,0+εc2,0+εc3,0+εc4,0+...+εcn,0) N, n is 5, and the average value epsilon of the initial radial strain of the concrete 62 is calculated and obtainedc0-559.1 μ ∈; the initial value of the steel pipe strain gauge 12 is epsilons0At-202.3 mu epsilon, the initial value of the temperature sensor 13 is t0＝29.6℃。
And S2, the data acquisition module 2 acquires monitoring data of the concrete strain gauge 11, the steel pipe strain gauge 12 and the temperature sensor 13 on each monitoring section according to the set sampling frequency. Wherein, in the monitoring section of the arch springing at a certain moment, the monitoring values of the five concrete strain gauges 11 are respectively epsilonc1、εc2、εc3、εc4And epsilonc5According to epsilonc＝(εc1+εc2+εc3+εc4+εc5+...+εcn) N is 5, and the average value of the monitored radial strain of the concrete 62 is calculated to be epsiloncThe monitoring value of the steel pipe strain gauge 12 is epsilon under-562.8 mu epsilons-228.9 mu epsilon, the monitoring value of the temperature sensor 13 being ts＝32.2℃。
S3, substituting the numerical values in the step S1 and the step S2 into the formula 1, and finally calculating sigmabI.e. the radial bonding stress between the inner wall of the steel tube 61 and the concrete 62.
Wherein the content of the first and second substances,
Δts＝ts-t0＝2.6℃；
Δεs＝εs-εs0＝-26.6με；
Δεc＝εc-εc0＝-3.7με，
εc＝(εc1+εc2+εc3+εc4+εc5)/5＝-562.8με，
εc0＝(εc1,0+εc2,0+εc3,0+εc4,0+εc5,0)/5＝-559.1με。
and S4, when the radial bonding stress between the inner wall of the steel pipe 61 of the monitoring section of the arch springing and the concrete 62 is greater than or equal to the early warning value in the early warning value setting module 4, the steel pipe concrete is proved to be in a debonding state, and the debonding warning submodule 51 sends warning information.
Claims (8)
1. The automatic monitoring and early warning system for the debonding of the concrete filled steel tube arch rib is characterized by comprising the arch rib, a sensor module (1), a data acquisition module (2), a data processing and analyzing module (3), an early warning value setting module (4) and a monitoring module (5), wherein the arch rib comprises a steel tube (61) and concrete (62), and the concrete (62) is poured in the steel tube (61);
the sensor modules (1) are arranged on monitoring sections in arch ribs, each sensor module (1) of each monitoring section comprises a concrete strain gauge (11), a steel pipe strain gauge (12) and a temperature sensor (13), the plurality of concrete strain gauges (11) are arranged, and the plurality of concrete strain gauges (11) are embedded in the concrete (62) at intervals; the steel pipe strain gauge (12) and the temperature sensor (13) are respectively arranged and are fixedly arranged on the outer wall of the steel pipe (61);
the monitoring sections comprise a rib toe section, an 1/4 span section and a dome section located on the rib;
five concrete strain gauges (11) are arranged on each monitoring section, one concrete strain gauge (11) is positioned at the inner axis of the steel pipe (61), the other four concrete strain gauges (11) are positioned in two orthogonal directions of the diameter of the steel pipe (61), and the four concrete strain gauges (11) are arranged at equal intervals along the radial direction; the data acquisition module (2) is used for acquiring data of the concrete strain gauge (11), the steel pipe strain gauge (12) and the temperature sensor (13);
the data processing and analyzing module (3) is used for calculating the radial bonding stress between the inner wall of the steel pipe (61) and the concrete (62) in the arch rib, and the calculation formula of the radial bonding stress is as follows:
in the formula, σbRadial bonding stress between the inner wall of the steel pipe (61) and the concrete (62); alpha is alphasIs the linear expansion coefficient of the steel pipe; mu.ssThe poisson ratio of the steel pipe; esThe elastic modulus of the steel pipe; b is the outer diameter of the steel pipe (61), and a is the inner diameter of the steel pipe (61);
Δtsis the surface temperature difference of the steel pipe (61) and is delta ts＝ts-t0Wherein t issA monitored temperature, t, of the steel pipe (61) obtained by the temperature sensor (13)0Is the initial temperature of the steel pipe (61) obtained by the temperature sensor (13);
Δεsis the difference in axial strain of the steel pipe (61) and is [ Delta ] [ epsilon ]s＝εs-εs0In which epsilonsA monitored axial strain value, ε, of the steel pipe (61) obtained for the steel pipe strain gauge (12)s0-an initial axial strain value of the steel pipe (61) obtained for the steel pipe strain gauge (12);
Δεcis the difference in radial strain of the concrete (62) and isc＝εc-εc0In which epsiloncIs the average value of the monitored radial strain, epsilon, of the concrete (62)c＝(εc1+εc2+εc3+εc4+εc5+...+εcn)/n，εc1～εcnMonitoring radial strain values acquired by respectively acquiring a plurality of concrete strain gauges (11); epsilonc0Is the average value of the initial radial strain, epsilon, of the concrete (62)c0＝(εc1,0+εc2,0+εc3,0+εc4,0+...+εcn,0)/n，εc1,0～εcn,0Initial radial strain values acquired by a plurality of concrete strain gauges (11) respectively;
the early warning value setting module (4) is used for setting an early warning value;
monitoring module (5) are used for the control of rib debonding, and include debonding alarm submodule (51), debonding alarm submodule (51) is used for acquireing the data of data processing and analysis module (3) and the data of early warning value setting module (4), work as in data processing and analysis module (3) steel pipe (61) inner wall with radial bonding stress between concrete (62) is greater than or equal to when the early warning value in the early warning value setting module (4), debonding alarm submodule (51) sends alarm information.
2. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the steel pipe strain gauge (12) and the temperature sensor (13) adopt vibrating wire type surface strain gauges.
3. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the concrete strain gauge (11) adopts a vibrating wire type embedded strain gauge.
4. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the data acquisition module (2) and the data processing and analyzing module (3) are in data transmission in a wireless transmission mode.
5. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the monitoring module (5) further comprises a model establishing submodule (52), the model establishing submodule (52) is used for establishing a model for the arch rib through modeling software to generate an arch rib model, the model establishing submodule (52) can acquire data of the sensor module (1) and the data processing and analyzing module (3), and records monitoring values and initial values of the concrete strain gauge (11), the steel pipe strain gauge (12) and the temperature sensor (13) and radial bonding stress between the inner wall of the steel pipe (61) and the concrete (62) on the corresponding monitoring section in the arch rib model.
6. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 5, characterized in that: the model building submodule (52) can also acquire data of the debonding alarm submodule (51), and when the radial bonding stress between the inner wall of the steel pipe (61) and the concrete (62) of the monitoring section is greater than or equal to an early warning value, the model building submodule (52) can display the corresponding monitoring section in the arch rib model in a vivid color.
7. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the monitoring module (5) further comprises a chart generation sub-module (53), wherein the chart generation sub-module (53) can acquire data of the sensor module (1) and the data processing and analyzing module (3), and generates a process chart of time, stress and temperature by recording monitoring values and initial values of the concrete strain gauge (11), the steel pipe strain gauge (12) and the temperature sensor (13) and radial bonding stress between the inner wall of the steel pipe (61) and the concrete (62).
8. The automatic monitoring and early warning system for the debonding of the steel pipe concrete arch rib according to claim 1, characterized in that: the monitoring module (5) further comprises a safety suggestion submodule (54), the safety suggestion submodule (54) is used for storing defect treatment measures in bridge construction and operation and maintenance stages, the safety suggestion submodule (54) can also obtain data of the debonding alarm submodule (51) to judge the position of the debonded monitoring section at the arch rib, and the monitoring module (5) can match the arch rib position of the debonded monitoring section with data of the debonding defect prevention measures in the bridge construction and operation and maintenance stages to obtain prevention measure attention points related to the position of the debonded monitoring section.
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| CN113124770A (en) * | 2021-04-23 | 2021-07-16 | 贵州桥梁建设集团有限责任公司 | Concrete filled steel tube debonding and empty comprehensive judgment method based on real-time monitoring data |
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