CN114755115A - Method and system for detecting bending fatigue damage of reinforced concrete beam - Google Patents
Method and system for detecting bending fatigue damage of reinforced concrete beam Download PDFInfo
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- 238000009864 tensile test Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 7
- 230000000007 visual effect Effects 0.000 abstract 1
- 206010016256 fatigue Diseases 0.000 description 36
- 125000004122 cyclic group Chemical group 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N2203/0023—Bending
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- G—PHYSICS
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
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Abstract
The invention discloses a method and a system for detecting bending fatigue damage of a reinforced concrete beam, wherein the method comprises the following steps: acquiring installation in-place information related to installation of the detection sample; acquiring test point information of a detection sample from the installation position information; and acquiring test data at the test point in real time and calculating the fatigue damage parameter A according to a preset calculation formula. The method comprises the steps of determining a test point of a test sample according to the installation position of the test sample and information such as the size and the shape of the test sample obtained after installation, improving the accuracy of test data by improving the accuracy of the determination of the test point, obtaining specific data of fatigue damage of the test sample through a calculation formula, and establishing a fatigue damage parameter A-cycle number coordinate system to obtain a visual change process of the fatigue damage of the test sample so as to provide accurate judgment parameters.
Description
Technical Field
The invention relates to the field of product detection systems, in particular to a method and a system for detecting bending fatigue damage of a reinforced concrete beam.
Background
The strain damage is one of the most main damage forms of engineering components, and before the components are put into use, the components are subjected to fatigue damage detection to know the damage nature of materials. The existing method for detecting the bending fatigue of the beam made of the reinforced concrete is to determine a test point when a test sample is placed on test equipment, then place the test sample on the test equipment, and adjust the test sample according to the predetermined test point. The inventor now provides a new detection method to detect reinforced concrete beams.
Disclosure of Invention
In order to obtain the bending fatigue damage data of the reinforced concrete beam, the application provides a method and a system for detecting the bending fatigue damage of the reinforced concrete beam.
In a first aspect, the application provides a method for detecting flexural fatigue damage of a reinforced concrete beam, which adopts the following technical scheme:
a method for detecting bending fatigue damage of a reinforced concrete beam comprises the following steps:
acquiring installation in-place information related to installation of the detection sample;
obtaining a test point of a detection sample from the installation position information;
and acquiring test data at the test point in real time and calculating the fatigue damage parameter A according to a preset calculation formula.
By adopting the technical scheme, the in-place installation information is obtained to determine that the test sample exists on the test equipment, meanwhile, the basic shape information such as the shape, length and width of an object can also be obtained from the installation information, after the basic shape information of the test sample is obtained, the material is known information before the test, the test point is determined according to the shape of the test sample, the force application size of the test equipment to the test sample is determined according to the material, thickness and length of the test sample, then the test sample is tested by adopting the test equipment, the obtained test result is substituted into a preset calculation formula, the final test data can be obtained, and according to the final test data, the detected sample can be judged whether to meet the production requirement.
Optionally, the method further includes:
acquiring test process data of each test point in real time, and comparing the test process data with preset data to obtain comparison result information;
and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
By adopting the technical scheme, in the testing process, the testing process is influenced due to the influence of the external environment, and the force application point may deviate, so that the data obtained in the testing process is compared with the preset data, when the testing point deviates, the force application point is determined again according to the force application point of the current testing equipment on the testing sample and the currently obtained equipment, and the accuracy of the testing data is kept.
Optionally, the step of obtaining test process data of each test point in real time further includes:
calculating a fatigue damage parameter A of the test sample in the detection process by adopting the following preset formula:
ω”+2μω′+αμ2+(1-α)μ2z＝F(t)*L
z′＝Aω′-β|ω′||z||z-γω′|z|2
where ω is the displacement of the force point of the bending specimen, z is the internal variable of the system of equations, μ is the cycle frequency, F(t)The acting force is the external acting force, alpha, beta and gamma are material indexes, and L is the environmental humidity.
By adopting the technical scheme, the sinusoidal dynamic load is utilized to carry out cyclic loading, the test sample generates certain deflection at the midpoint due to the generation of bending deformation, the test sample generates continuously-changing macroscopic dynamic response under the same cyclic load action along with the generation and development of fatigue damage of the test sample, the fatigue damage parameter A is correspondingly changed in the test process, the fatigue damage parameter A is calculated through the formula, and the bending fatigue damage detection condition of the test sample can be known from the fatigue damage parameter A.
Optionally, the step of substituting the obtained test process data into the following formula to calculate the fatigue damage parameter a of the test sample in the detection process includes:
and obtaining the basic mechanical property parameters of the detected sample through a tensile test.
By adopting the technical scheme, before testing, basic mechanical property parameters of the test sample, such as tensile strength, elongation and the like of the test sample, are obtained through a tensile test so as to calculate the bending fatigue damage data of the test sample.
Optionally, the step of determining that the comparison result information is that the test process data is inconsistent with the preset data further includes: acquiring various operation parameters of the test equipment, and judging whether the various operation parameters of the test equipment normally operate or not;
and if the operation parameters of the test equipment are normal, acquiring the force application point information again.
By adopting the technical scheme, when the wrong parameter information is acquired, data errors caused by the fault reason of the test equipment exist, so that the fault is eliminated by judging whether the test equipment has faults or not, and unnecessary troubles are reduced.
Optionally, the step of determining that the comparison result information is that the test process data is inconsistent with the preset data further includes:
Acquiring the current position information of a force application point of the test equipment;
if the current force application point position information of the test equipment is inconsistent with the initial position information; the test is suspended.
By adopting the technical scheme, the wrong test data is obtained, and the data error is possibly caused because the contact point of the test equipment and the test sample deviates in the force application process of the test equipment, so that the reason for the data error is determined by detecting whether the front test point and the rear test point are the same, and the accuracy of the detected data is improved.
The second aspect, the application provides a reinforced concrete roof beam bending fatigue damage detecting system, adopts following technical scheme:
a reinforced concrete beam bending fatigue damage detection system, the system comprising:
the test sample position acquisition module is used for acquiring installation in-place information related to the installation of the detection sample;
the test point information acquisition module is used for acquiring the test point information of the detection sample from the installation position information;
and the test module is used for adjusting the force application point information of the test equipment based on the test point information.
By adopting the technical scheme, the in-place installation information is obtained to determine that the test sample exists on the test equipment, meanwhile, the shape information of the shape, length, width and other bases of the object can be obtained from the installation information, after the basic shape information of the test sample is obtained, the material is known information before the test, the test point is determined according to the shape of the test sample, and the force application size of the test equipment to the test sample is determined according to the material, the thickness and the length of the test sample. The size of the force application point during the test is determined according to the basic information of the test sample, so that the corresponding set parameters can be obtained according to the actual information of the sample during the test, and the test convenience is improved.
Optionally, the system further comprises:
the test data checking module is used for acquiring test process data of each test point in real time and comparing the test process data with preset data to obtain comparison result information; and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
By adopting the technical scheme, in the test process, the test process is influenced due to the influence of the external environment, and the force application point may deviate, so that the data obtained in the test process is compared with the preset data, when the test point deviates, the force application point is determined again according to the force application point of the current test equipment on the test sample and the currently obtained equipment, and the accuracy of the test data is kept.
In a third aspect, the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for detecting flexural fatigue damage of a reinforced concrete beam according to any one of the second aspect.
In a fourth aspect, the present application provides a computer readable storage medium storing a computer program capable of being loaded by a processor and executing the second aspect.
In summary, the present application has the following beneficial effects:
1. determining a test point of the test sample according to the installation position of the test sample and the information such as the size, the shape and the like of the test sample obtained after installation, improving the accuracy of test data by improving the accuracy of the determination of the test point, obtaining the specific data of the fatigue damage of the test sample by a calculation formula, and establishing a fatigue damage parameter A-cycle number coordinate system to obtain the intuitive change process of the fatigue damage of the test sample so as to provide accurate judgment parameters;
2. in the testing process, the testing data is compared with preset testing data so as to check whether the detected data meets the preset condition or not in real time in the testing process, if the error data occurs, the error reasons are checked in a mode of checking testing equipment, testing samples and the like, so that the adjustment can be performed in time, and the detection efficiency is improved.
Drawings
FIG. 1 is a flow chart of a method for detecting bending fatigue damage of a reinforced concrete beam according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a computer device according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a method for detecting bending fatigue damage of a reinforced concrete beam, and the method comprises the following steps of:
s100: and acquiring installation in-place information related to the installation of the detection sample.
In this embodiment, the installation-in-place information refers to whether the test specimen is correctly placed on the test device.
Specifically, a test sample is installed on the test equipment, the sensor arranged at the corresponding position on the test equipment detects corresponding information, a signal is fed back to the system, and the system can acquire basic information such as the size of the test sample according to data fed back by the sensor so as to acquire a force application point according to the size information of the test sample. For example, the information of the test sample detected by the first sensor, the second sensor and the third sensor is received, and the information such as the thickness and the length of the test sample can be calculated from the installation distance information of the first sensor, the second sensor and the third sensor.
S200: test point information of the test sample is obtained from the mounting bit information.
In this embodiment, the test point information refers to the point of application of force to the test sample by the test device.
Specifically, after the size information of the test sample is acquired, the relevant information of the test sample is input into the test model according to a preset test model (including historical test information), a force application point is obtained, and then a strain gauge is installed at the force application point to acquire the stress change of the test sample at the point.
S300: and acquiring test data at the test point in real time and calculating the fatigue damage parameter A according to a preset calculation formula.
Specifically, the change data of the test equipment in the test on the test sample pair is obtained through a sensor on the test equipment, and the data is substituted into a calculation formula preset in the system for calculation, so that the fatigue damage parameter A is obtained.
Further, in an embodiment, S300 includes S301: calculating the fatigue damage parameter A of the test sample in the detection process by the following calculation formula:
ω”+2μω′+αμ2+(1-α)μ2z＝F(t)*L
z′＝Aω′-β|ω′||z||z-γω′|z|2
where ω is the displacement of the stress point of the bending specimen, z is the internal or intermediate variable of the system of equations, μ is the cycle frequency, F(t)The acting force is external acting force, alpha, beta and gamma are material indexes, and L is environment humidity.
In the present embodiment, the fatigue damage parameter a is a parameter reflecting the degree of damage of the test sample during the test.
In this embodiment, before the bending fatigue test, the tensile test is performed to obtain the basic mechanical initial data of the test sample, such as tensile strength, elongation, and the like, and the environmental humidity L is measured by using an environmental humidity sensor during the test. The sine dynamic load is utilized to carry out cyclic loading, the test sample generates certain deflection at the midpoint due to bending deformation, and the test sample generates continuously-changing macroscopic dynamic response under the action of the same cyclic load along with the generation and development of fatigue damage of the test sample. During the test, F(t)And the dynamic signals of the displacement omega of the stress point of the bending sample are amplified and output by a load and displacement sensor of the test system, and are transmitted to the system after digital-to-analog conversion. In the testing process, a testing sample is loaded circularly through testing equipment, dynamic load and deflection signals are synchronously acquired in the testing process, and then the change data of the fatigue damage parameter A in the testing process is obtained through calculation of the formula.
Further, S300 further includes S400: acquiring test process data of each test point in real time, and comparing the test process data with preset data to obtain comparison result information; and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
In this embodiment, the test process data refers to stress data of the test sample in various aspects during the test process; the preset data refers to data of bending fatigue damage of the reinforced concrete beam in historical test.
Specifically, detection sensors are arranged on the test equipment and the test sample and used for detecting stress change and state change of the test sample in the detection process, then the detected data are transmitted back to the system, the transmitted data are compared with data preset in the system, and if the transmitted data are inconsistent with the preset data, the fact that the contact between the test equipment and the test sample is deviated or the test equipment is in fault in the detection process is proved. When the data are inconsistent, acquiring various function detection data of the test equipment to judge whether the test equipment fails or not, if the acquired data are inconsistent with the initial data, proving that the test equipment fails to cause the acquired data to be inconsistent with the preset data, stopping testing at the moment, and overhauling the test equipment. And if the acquired function detection data of the test equipment are consistent with the initial data, removing the fault reason of the test equipment.
And further acquiring the position information of the current force application point of the test equipment, comparing the information with the initial force application point position information, and if the information is inconsistent with the initial force application point position information, proving that the situation of displacement occurs, the test needs to be suspended, and the test sample needs to be readjusted. For example, the initial force application point of the test sample is a, the position of the point a moves forward by 1 mm in the test process, when the test data and the preset test data have displacement at the point a, a deviation of 3 appears on the ordinate, according to the data, the current test point a which has moved should be moved backward by 1 mm, and the data is recalculated from the error.
The embodiment of the application also discloses a system for detecting the bending fatigue damage of the reinforced concrete beam, which comprises a test sample position acquisition module, a detection module and a detection module, wherein the test sample position acquisition module is used for acquiring the installation in-place information related to the installation of the detection sample; the test point information acquisition module is used for acquiring the test point information of the detection sample from the installation position information; and the test module is used for adjusting the force application point information of the test equipment based on the test point information.
The system further comprises a test data verification module, a comparison module and a comparison module, wherein the test data verification module is used for acquiring test process data of each test point in real time and comparing the test process data with preset data to acquire comparison result information; and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
Further, the system also comprises a fatigue damage calculation module, which is used for substituting the obtained test process data into the following formula to calculate a fatigue damage parameter A of the test sample in the detection process:
ω”+2μω′+αμ2+(1-α)μ2z＝F(t)*L
z′＝Aω′-β|ω′||z||z-γω′|z|2
where ω is the displacement of the force point of the bending pattern, z is the internal variable of the system of equations, μ is the cycle frequency, F(t)The acting force is the external acting force, alpha, beta and gamma are material indexes, and L is the environmental humidity.
Further, the system also comprises a basic parameter acquisition module which is used for acquiring the basic mechanical property parameters of the detection type sample through a tensile test.
Furthermore, the system also comprises an operation detection module which is used for acquiring various operation parameters of the test equipment and judging whether the various operation parameters of the test equipment normally operate; and if the operation parameters of the test equipment are normal, acquiring the force application point information again.
Furthermore, the system also comprises a data verification module used for acquiring the current position information of the force application point of the test equipment; if the current force application point position information of the test equipment is inconsistent with the initial position information; the test is suspended.
The embodiment of the application also discloses a computer device, which can be a server, with reference to fig. 2. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store historical suspicious behavior data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of detecting flexural fatigue damage to a reinforced concrete beam, the method comprising the steps of: s100: acquiring installation in-place information related to installation of the detection sample;
S200: acquiring test point information of a detection sample from the installation position information;
s300: and adjusting the force application point information of the testing equipment based on the testing point information.
The embodiment of the application also discloses a computer readable storage medium. In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
s100: acquiring installation in-place information related to installation of the detection sample;
s200: acquiring test point information of a detection sample from the installation position information;
s300: and adjusting the force application point information of the testing equipment based on the testing point information.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, the computer program can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for detecting bending fatigue damage of a reinforced concrete beam is characterized by comprising the following steps:
acquiring installation in-place information related to installation of the detection sample;
obtaining a test point of a detection sample from the installation position information;
And acquiring test data at the test point in real time and calculating the fatigue damage parameter A according to a preset calculation formula.
2. The method of claim 1, further comprising:
acquiring test process data of each test point in real time, and comparing the test process data with preset data to obtain comparison result information;
and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
3. The method for detecting the flexural fatigue damage of the reinforced concrete beam according to claim 1, wherein the step of acquiring test process data of each test point in real time further comprises:
calculating a fatigue damage parameter A of the test sample in the detection process by adopting the following preset formula:
ω″+2μω′+αμ2+(1-α)μ2z＝F(t)*L
z′＝Aω′-β|ω′||z||z-γω′|z|2
where ω is the displacement of the stress point of the bending specimen, z is the internal variable of the equation set, μ is the cycle frequency, F(t)The acting force is external acting force, alpha, beta and gamma are material indexes, and L is environment humidity.
4. The method for detecting the bending fatigue damage of the reinforced concrete beam as recited in claim 3, wherein the step A of calculating the fatigue damage parameter of the test sample in the detection process by substituting the obtained test process data into the following formula comprises the following steps:
And obtaining basic mechanical property parameters of the detection sample through a tensile test.
5. The method for detecting the flexural fatigue damage of the reinforced concrete beam according to claim 2, wherein the step of determining whether the comparison result information is that the test process data is inconsistent with the preset data further comprises:
acquiring various operating parameters of the test equipment, and judging whether the various operating parameters of the test equipment operate normally or not;
and if the operation parameters of the test equipment are normal, acquiring the force application point information again.
6. The method for detecting the flexural fatigue damage of the reinforced concrete beam according to claim 2, wherein the step of determining whether the comparison result information is that the test process data is inconsistent with the preset data further comprises:
acquiring the current position information of a force application point of the test equipment;
if the current force application point position information of the test equipment is inconsistent with the initial position information; the test is suspended.
7. A reinforced concrete beam bending fatigue damage detection system, characterized in that, this system includes:
the test sample position acquisition module is used for acquiring installation in-place information related to the installation of the detection sample;
the test point information acquisition module is used for acquiring the test point information of the detection sample from the installation position information;
And the test module is used for adjusting the force application point information of the test equipment based on the test point information.
8. A reinforced concrete beam bending fatigue damage detection system as claimed in claim 7, wherein the system further comprises:
the test data checking module is used for acquiring test process data of each test point in real time and comparing the test process data with preset data to obtain comparison result information; and if the comparison result information is that the test process data is inconsistent with the preset data, acquiring the force point information again according to the current force point information and the test process data.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program performs the steps of a method for detecting flexural fatigue damage of a reinforced concrete beam as claimed in any one of claims 1 to 6.
10. A computer-readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which executes the method as claimed in any of the claims 1-6.
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| JP2008170160A (en) * | 2007-01-09 | 2008-07-24 | Univ Nagoya | Specimen for bending fatigue detection, and bending fatigue test method |
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