Concrete shear damage prediction method based on acoustic emission technology

Abstract

The invention relates to the field of material damage prediction, in particular to a concrete shear damage prediction method based on an acoustic emission technology, which comprises the following steps: acquiring a real-time acoustic signal by using an acoustic emission probe and an acoustic emission processing unit, and measuring a real-time external load and a real-time load displacement by using a load sensor and a displacement sensor; real-time shear stress is calculated according to the real-time external load and the contact area, real-time shear strain is calculated according to the real-time load displacement and the original thickness, so that real-time plastic strain is calculated, the accumulated sound wave signal number and the accumulated damage signal number are calculated according to the real-time signal number and the damage signal number, and a damage factor is obtained; and constructing a shear damage model according to the real-time plastic strain and the damage factor, and performing shear damage prediction on the to-be-detected concrete area by using the shear damage model. According to the method, the concrete damage prediction speed can be increased, and the concrete damage prediction accuracy is improved.

Description

[0001] The present invention relates to the field of material damage prediction, and in particular to a concrete shear damage prediction method, system, electronic equipment and computer-readable storage medium based on acoustic emission technology. Background Art

[0002] Concrete is an important material in engineering construction, and predicting concrete shear damage is an essential step in the practical application of concrete. At present, the traditional methods for predicting concrete shear damage are mainly: using nonlinear finite element methods to establish a numerical model of concrete, determine the physical and mechanical parameters of concrete, and apply loads to the numerical model to simulate the stress conditions under actual use conditions, track crack development, and evaluate the degree of damage.

[0003] The numerical model of concrete established in the traditional method is a static model, and some physical parameters of concrete will change with the destruction of the internal structure, such as elastic modulus, so the prediction of concrete under dynamic load is not accurate enough. Although a large number of physical and mechanical parameters need to be determined in the numerical model, these parameters cannot simulate the tiny cracks inside the concrete well, which also leads to inaccurate predictions for specific concrete, and a large number of parameters will also make the numerical model susceptible to interference, and the prediction speed is relatively slow in practical applications. Summary of the invention

[0004] The present invention provides a concrete shear damage prediction method based on acoustic emission technology and a computer-readable storage medium, the main purpose of which is to improve the speed of concrete damage prediction and enhance the accuracy of concrete damage prediction.

[0005] To achieve the above object, the present invention provides a method for predicting concrete shear damage based on acoustic emission technology, comprising:

[0006] The original sound wave signal generated by fission inside the concrete area to be tested is obtained by using a pre-built acoustic emission probe, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor;

[0007] The original sound wave signal is processed by using a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter;

[0008] The load sensor is used to measure the real-time external load on the concrete area to be tested, and the displacement sensor is used to measure the real-time load displacement of the concrete area to be tested;

[0009] Calculate the real-time shear stress according to the real-time external load and the preset contact area, and calculate the real-time shear strain according to the real-time load displacement and the preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured;

[0010] Calculating the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculating the shear factor according to the shear elastic modulus and a preset initial elastic modulus;

[0011] According to the shear factor, shear elastic modulus, initial elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the preset shear-plastic transformation;

[0012] Acquire the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and search for the damage signal number using a preset historical relationship table according to the real-time shear stress, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data;

[0013] Calculate the cumulative number of acoustic wave signals according to the number of real-time signals, calculate the cumulative number of damage signals according to the number of damage signals, and calculate the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damage signals;

[0014] A shear damage model is constructed based on the real-time plastic strain and damage factor, and the shear damage model is used to predict the shear damage of the concrete area to be tested.

[0015] Optionally, the method of using a pre-built acoustic emission probe to obtain an original sound wave signal generated by fission inside the concrete area to be tested includes:

[0016] The acoustic emission probe is fixed on the surface of the concrete area to be tested by using a pre-constructed coupling agent to obtain a positioning acoustic emission probe, wherein the coupling agent is a vacuum gel;

[0017] According to the preset collection cycle, set the collection frequency of the positioning acoustic emission probe;

[0018] According to the acquisition frequency, the original sound wave vibration generated by fission inside the concrete area to be tested is collected by using a positioning acoustic emission probe;

[0019] The original sound wave vibration is converted into an original sound wave signal by using a pre-built piezoelectric element, wherein the material of the piezoelectric element is barium titanate and is built into the acoustic emission probe.

[0020] Optionally, the using a pre-built acoustic emission processing unit to perform signal processing on the original acoustic wave signal to obtain a real-time acoustic wave signal includes:

[0021] Amplifying the original sound wave signal using a signal amplifier to obtain an amplified sound wave signal;

[0022] Identifying a noise sound wave signal in the amplified sound wave signal according to a preset signal amplitude range, wherein the noise sound wave signal includes: an environmental noise signal, an electromagnetic interference signal, and an instrument vibration signal;

[0023] The noise sound wave signal is filtered by using a signal filter to obtain a real-time sound wave signal.

[0024] Optionally, the calculating of the real-time shear stress according to the real-time external load and the preset contact area, and the calculating of the real-time shear strain according to the real-time load displacement and the preset original thickness, comprises:

[0025] According to the real-time external load and the contact area, the real-time shear stress is calculated using the following formula:

[0026]

[0027] Among them, σ represents the real-time shear stress, P represents the real-time external load, and S represents the contact area;

[0028] According to the real-time load displacement and original thickness, the real-time shear strain is calculated using the following formula:

[0029]

[0030] Where ∈ represents the real-time shear strain, X represents the real-time load displacement, and L represents the original thickness.

[0031] Optionally, the calculating of the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and the calculating of the shear factor according to the shear elastic modulus and a preset initial elastic modulus include:

[0032] According to the real-time shear stress and real-time shear strain, the shear elastic modulus is calculated using the following formula:

[0033]

[0034] Where G represents the shear elastic modulus, γ represents the real-time shear stress, and ∈ represents the real-time shear strain;

[0035] According to the preset initial elastic modulus and the shear elastic modulus, the shear factor is calculated using the following formula:

[0036]

[0037] Where d represents the shear factor and E represents the initial elastic modulus.

[0038] Optionally, the calculating of the real-time plastic strain by using a preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain comprises:

[0039] According to the shear factor, shear elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the following shear-plastic transformation:

[0040]

[0041] Among them, ∈ S represents the real-time plastic strain, d represents the shear factor, ∈ represents the real-time shear strain, E represents the initial elastic modulus, and G represents the shear elastic modulus.

[0042] Optionally, the calculating of the cumulative number of acoustic wave signals according to the number of real-time signals, the calculating of the cumulative number of damage signals according to the number of damage signals, and the calculating of the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damage signals include:

[0043] According to the real-time signal number, the cumulative sound wave signal number is calculated using the following formula:

[0044]

[0045] Among them, A L represents the number of accumulated acoustic wave signals, n represents the number of different real-time external loads currently collected, (A P ) i Indicates the number of real-time signals obtained for the i-th time, where A P represents the number of real-time signals received when the real-time external load is P, and i represents the real-time external load obtained for the i-th time;

[0046] The cumulative number of damage signals is calculated according to the real-time damage signal number using the following formula:

[0047]

[0048] Among them, A M represents the number of accumulated damage signals, n represents the number of summations, (A S ) i represents the number of damaged signals found for the i-th time;

[0049] The damage factor is calculated using the cumulative number of acoustic wave signals and the cumulative number of damage signals:

[0050]

[0051] Where D represents the damage factor, A L Indicates the number of accumulated sound wave signals, A M Indicates the number of accumulated damage signals.

[0052] Optionally, constructing a shear damage model according to the real-time plastic strain and the damage factor includes:

[0053] The following shear damage model is constructed based on the damage factor and real-time plastic strain:

[0054]

[0055] Among them, ∈ SF represents the predicted plastic strain, D represents the damage factor, ∈ S represents the real-time plastic strain, D A and D B Indicates the preset damage parameters.

[0056] Optionally, the using the shear damage model to predict the shear damage of the concrete area to be tested includes:

[0057] According to the real-time plastic strain and the acquisition period, the shear damage model is used to perform periodic damage prediction on the concrete area to be tested to obtain the predicted plastic strain;

[0058] The predicted plastic strain is subjected to the following plastic-shear transformation to obtain the predicted shear strain:

[0059]

[0060] Among them, ∈ F represents the predicted shear strain, d represents the shear factor, G represents the shear elastic modulus, and E represents the initial elastic modulus;

[0061] Based on the predicted shear strain, the predicted load displacement is calculated using the following formula:

[0062] X F =∈ F ×L

[0063] Among them, X F To predict load displacement, L is the original thickness.

[0064] To achieve the above object, the present invention also provides a concrete shear damage prediction system based on acoustic emission technology, comprising:

[0065] A real-time data acquisition module is used to use a pre-built acoustic emission probe to acquire the original sound wave signal generated by fission inside the concrete area to be tested, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor, and a displacement sensor. The original sound wave signal is processed by a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter;

[0066] A stress-strain calculation module, used to measure the real-time external load on the concrete area to be measured by using the load sensor, measure the real-time load displacement of the concrete area to be measured by using the displacement sensor, calculate the real-time shear stress according to the real-time external load and a preset contact area, and calculate the real-time shear strain according to the real-time load displacement and a preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured;

[0067] A strain-plastic transformation module is used to calculate the shear elastic modulus according to the real-time shear stress and the real-time shear strain, calculate the shear factor according to the shear elastic modulus and the preset initial elastic modulus, and calculate the real-time plastic strain by using the preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain;

[0068] A damage model construction module is used to obtain the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and to search for the damage signal number according to the real-time shear stress using a preset historical relationship table, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data, calculate the cumulative acoustic wave signal number according to the real-time signal number, calculate the cumulative damage signal number according to the damage signal number, calculate the damage factor based on the cumulative acoustic wave signal number and the cumulative damage signal number, construct a shear damage model according to the real-time plastic strain and the damage factor, and use the shear damage model to predict the shear damage of the concrete area to be tested.

[0069] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising:

[0070] a memory storing at least one instruction; and

[0071] The processor executes the instructions stored in the memory to implement the above-mentioned concrete shear damage prediction method based on acoustic emission technology.

[0072] In order to solve the above problems, the present invention also provides a computer-readable storage medium, in which at least one instruction is stored. The at least one instruction is executed by a processor in an electronic device to implement the above-mentioned concrete shear damage prediction method based on acoustic emission technology.

[0073] In order to solve the problems described in the background technology, the present invention first uses a pre-constructed acoustic emission probe to obtain the original acoustic wave signal generated by fission inside the concrete area to be tested, so as to achieve accurate acquisition of the original acoustic wave signal and provide a premise for subsequent shear damage analysis. The original acoustic wave signal is processed by a pre-constructed acoustic emission processing unit to obtain a real-time acoustic wave signal, so that the shear damage prediction eliminates the interference of noise signals and enhances the clarity of the signal. Further, by measuring the real-time external load and the real-time load displacement, the dynamic acquisition of the state of the concrete area to be tested is achieved, which provides conditions for the subsequent calculation of dynamic shear stress and shear strain. According to the real-time shear stress and the real-time shear strain, the dynamic shear stress and the shear strain can be obtained, which improves the accuracy of the prediction. Since the real-time shear stress and the real-time shear strain change dynamically according to the state of the concrete area to be tested, the shear elastic modulus calculated according to the real-time shear stress and the real-time shear strain is also dynamic, which avoids the deviation of the calculated elastic modulus from the actual situation due to changes in the structure of the concrete area to be tested. By calculating the shear factor, the damage caused by the shear stress in the concrete area to be tested is intuitively displayed. The real-time plastic strain is calculated by shear-plastic transformation, and the real-time shear strain is converted into real-time plastic strain, which characterizes the irreversible shear strain occurring in the concrete area to be tested. By obtaining the real-time signal number and calculating the cumulative number of acoustic wave signals according to the real-time signal number, the damage of the concrete area to be tested caused by the real-time external load is intuitively displayed. By finding the number of damage signals and calculating the cumulative number of damage signals according to the number of damage signals, the historical damage of the concrete area to be tested under the real-time external load is clearly displayed. Based on the cumulative number of acoustic wave signals and the cumulative number of damage signals, the damage factor is calculated, which realizes an intuitive description of the damage process of the concrete area to be tested. A shear damage model is constructed based on the real-time plastic strain and the damage factor, which realizes a rapid prediction of the damage condition of the concrete area to be tested. Therefore, the present invention can improve the speed of concrete damage prediction and enhance the accuracy of concrete damage prediction. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 A schematic diagram of a flow chart of a method for predicting concrete shear damage based on acoustic emission technology provided by an embodiment of the present invention;

[0075] Figure 2 A functional module diagram of a concrete shear damage prediction system based on acoustic emission technology provided by an embodiment of the present invention;

[0076] Figure 3 A schematic structural diagram of an electronic device for implementing the concrete shear damage prediction method based on acoustic emission technology provided by an embodiment of the present invention.

[0077] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0078] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0079] The embodiment of the present application provides a method for predicting concrete shear damage based on acoustic emission technology. The execution subject of the method for predicting concrete shear damage based on acoustic emission technology includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided by the embodiment of the present application. In other words, the method for predicting concrete shear damage based on acoustic emission technology can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0080] Reference Figure 1 FIG. 1 is a flow chart of a method for predicting concrete shear damage based on acoustic emission technology according to an embodiment of the present invention. In this embodiment, the method for predicting concrete shear damage based on acoustic emission technology includes:

[0081] S1. Using a pre-built acoustic emission probe to obtain the original sound wave signal generated by fission inside the concrete area to be tested, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor.

[0082] It should be explained that the acoustic emission probe refers to a device that detects the original sound wave signal generated by the internal micro cracks or defects of the concrete area to be tested. The concrete area to be tested refers to a rectangular area of ​​concrete that needs to be predicted for shear damage. For example, a rectangular area is demarcated on the wall of a high-rise building made of concrete, and the rectangular area is the concrete area to be tested. Among them, the fission of the internal structure of the concrete area to be tested will release energy, and this energy will propagate in the form of sound waves.

[0083] It can be understood that the load sensor refers to a sensor that measures the external force on the concrete area to be tested, wherein the external force includes: the gravity of the concrete area to be tested and the squeezing force of external objects on the concrete area to be tested. The displacement sensor refers to a sensor that measures the displacement of the concrete area to be tested due to the real-time external load. The original sound wave signal refers to the sound wave signal collected by the acoustic emission probe without signal processing.

[0084] In detail, the method of using a pre-built acoustic emission probe to obtain the original sound wave signal generated by fission inside the concrete area to be tested includes:

[0085] The acoustic emission probe is fixed on the surface of the concrete area to be tested by using a pre-constructed coupling agent to obtain a positioning acoustic emission probe, wherein the coupling agent is a vacuum gel;

[0086] According to the preset collection cycle, set the collection frequency of the positioning acoustic emission probe;

[0087] According to the acquisition frequency, the original sound wave vibration generated by fission inside the concrete area to be tested is collected by using a positioning acoustic emission probe;

[0088] The original sound wave vibration is converted into an original sound wave signal by using a pre-built piezoelectric element, wherein the material of the piezoelectric element is barium titanate and is built into the acoustic emission probe.

[0089] It should be explained that the coupling agent refers to a substance that fixes the acoustic emission probe on the surface of the concrete area to be tested, and has the function of reducing the gap between the surface of the concrete area to be tested and the acoustic emission probe, thereby improving the efficiency of the original sound wave signal being transmitted from the surface of the concrete area to be tested to the probe. The vacuum gel is a coupling agent with good adhesion, elasticity and durability and can remain stable under various environmental conditions. It is liquid before solidification and is used to fill tiny holes and uneven places on the surface of the concrete area to be tested. After solidification, it forms a solid gel, wherein the solid gel is a good sound wave transmission medium.

[0090] It can be understood that the original sound wave vibration refers to the vibration generated by fission inside the concrete area to be tested, and the vibration is converted into an electrical signal by the piezoelectric element, and the electrical signal is the original sound wave signal. The acquisition cycle refers to the time interval for the acoustic emission probe to collect the original sound wave vibration, which can be set according to specific requirements. The acquisition frequency refers to the number of times the acoustic emission probe collects the original sound wave signal per unit time, which is determined according to the acquisition cycle.

[0091] Furthermore, the piezoelectric element refers to a device that can convert the original sound wave vibration into the original sound wave signal. The barium titanate refers to a piezoelectric material with excellent piezoelectric properties, which has a high piezoelectric coefficient and can generate a larger original sound wave signal when receiving the original sound wave vibration, thereby improving the sensitivity of the acoustic emission probe. The piezoelectric coefficient refers to a physical quantity that describes the ability of a piezoelectric material to generate charge or voltage when subjected to a real-time external load.

[0092] S2. Processing the original sound wave signal using a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter.

[0093] It should be explained that the real-time sound wave signal refers to the original sound wave signal that has been amplified and filtered. The signal amplifier refers to a device that amplifies the original sound wave signal for subsequent signal processing, wherein signal amplification refers to amplifying the amplitude of the original sound wave signal so that the original sound wave signal can be clearly received by the signal filter. The signal filter refers to a device that only allows amplified sound wave signals within a specific amplitude range to pass, wherein the amplified sound wave signal refers to the original sound wave signal after signal amplification.

[0094] In detail, the method of using a pre-built acoustic emission processing unit to process the original acoustic wave signal to obtain a real-time acoustic wave signal includes:

[0095] Amplifying the original sound wave signal using a signal amplifier to obtain an amplified sound wave signal;

[0096] Identifying a noise sound wave signal in the amplified sound wave signal according to a preset signal amplitude range, wherein the noise sound wave signal includes: an environmental noise signal, an electromagnetic interference signal, and an instrument vibration signal;

[0097] The noise sound wave signal is filtered by using a signal filter to obtain a real-time sound wave signal.

[0098] It can be understood that the preset signal amplitude range refers to a signal amplitude range set in advance according to specific requirements so that the signal filter can perform filtering.

[0099] For example, Xiao Zhang is an operator in a concrete processing plant. The signal amplitude range of the signal filter of a concrete area to be tested in the plant is usually set to 40dB-110dB. Signals below 40dB and above 110dB in the amplified sound wave signal will be filtered by the signal filter. One day, Xiao Zhang receives a request to improve the prediction accuracy of the concrete area to be tested, so Xiao Zhang can change the signal amplitude range of the signal filter to 40dB-80dB.

[0100] It should be explained that the environmental noise signal refers to the sound vibration signal generated by environmental factors, such as the sound of wind, whistle and human voice. The electromagnetic interference signal refers to the electromagnetic wave signal emitted by surrounding electronic devices, such as mobile phones, computers and electronic watches. The instrument vibration signal refers to the mechanical vibration signal emitted by the movement of the instrument that collects the original sound wave signal, such as the mechanical vibration signal generated by the movement of the acoustic emission probe, signal amplifier and signal filter.

[0101] S3. Using the load sensor to measure the real-time external load on the concrete area to be tested, and using the displacement sensor to measure the real-time load displacement of the concrete area to be tested.

[0102] It should be explained that the real-time external load refers to the external force on the concrete area to be tested, wherein the external force changes in real time. The real-time load displacement refers to the displacement of the concrete area to be tested under the action of the real-time external load relative to the original thickness of the concrete area to be tested, wherein the original thickness refers to the thickness of the concrete area to be tested when it is not subjected to the real-time external load.

[0103] For example, the original thickness of a concrete area to be tested is 0.2 m. After being subjected to a real-time external load, the real-time load displacement of the concrete area to be tested is measured to be 0.01 m.

[0104] S4. Calculate the real-time shear stress according to the real-time external load and the preset contact area, and calculate the real-time shear strain according to the real-time load displacement and the preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured.

[0105] It should be explained that the real-time shear stress refers to the ratio of the real-time external load on the concrete area to be tested to the contact area of ​​the real-time external load. The shear stress will cause the shape of the concrete area to be tested to change but the volume remains unchanged. The real-time shear strain refers to the change in the real-time load displacement per unit thickness, which is used to characterize the shape change of the concrete area to be tested under the real-time shear stress.

[0106] In detail, the real-time shear stress is calculated according to the real-time external load and the preset contact area, and the real-time shear strain is calculated according to the real-time load displacement and the preset original thickness, including:

[0107] According to the real-time external load and the contact area, the real-time shear stress is calculated using the following formula:

[0108]

[0109] Among them, σ represents the real-time shear stress, P represents the real-time external load, and S represents the contact area;

[0110] According to the real-time load displacement and original thickness, the real-time shear strain is calculated using the following formula:

[0111]

[0112] Where ∈ represents the real-time shear strain, X represents the real-time load displacement, and L represents the original thickness.

[0113] For example, the original thickness of a concrete area to be tested is 1m, and the contact area with the load sensor is 0.01m 2In a certain measurement, the real-time external load on the concrete area to be tested is 200 kN, and the real-time load displacement is 0.05 cm. The real-time shear stress and real-time shear strain are calculated to be 2×10 4 kPa and 5×10 -4 .

[0114] S5. Calculate the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculate the shear factor according to the shear elastic modulus and a preset initial elastic modulus.

[0115] It should be explained that the shear elastic modulus refers to the ratio of the real-time shear stress to the real-time shear strain, and is used to characterize the deformation state of the concrete area to be tested when subjected to shear stress. The elastic modulus is used to characterize the ability of the concrete area to be tested to resist elastic deformation when subjected to external force. The elastic deformation refers to the deformation of the concrete area to be tested to restore its original shape. When the concrete area to be tested is subjected to real-time external load, its internal structure will change. Therefore, the shear elastic modulus is a variable.

[0116] Furthermore, the initial elastic modulus refers to the elastic modulus of the concrete area to be measured before the measurement begins, which is a constant value. The shear factor refers to the degradation rate of the stiffness of the concrete area to be measured, wherein the stiffness characterizes the ability of the concrete area to be measured to resist real-time shear strain when it is subjected to real-time shear stress.

[0117] In detail, the shear elastic modulus is calculated according to the real-time shear stress and the real-time shear strain, and the shear factor is calculated according to the shear elastic modulus and a preset initial elastic modulus, including:

[0118] According to the real-time shear stress and real-time shear strain, the shear elastic modulus is calculated using the following formula:

[0119]

[0120] Where G represents the shear elastic modulus, γ represents the real-time shear stress, and ∈ represents the real-time shear strain;

[0121] According to the preset initial elastic modulus and the shear elastic modulus, the shear factor is calculated using the following formula:

[0122]

[0123] Where d represents the shear factor and E represents the initial elastic modulus.

[0124] For example, the real-time shear stress of a concrete area to be tested is 750 kPa, and the real-time shear strain is 5×10 -4 , then the shear elastic modulus can be calculated as: (2×104 ) / (5×10 -4 )=40MPa, the initial elastic modulus of the concrete area to be tested is 50MPa, then the shear factor can be calculated according to the shear elastic modulus and the initial elastic modulus: 40 / 50=0.8.

[0125] S6. Calculate the real-time plastic strain using a preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain.

[0126] It should be explained that the shear-plastic transformation refers to a transformation formula for converting real-time shear strain into real-time plastic strain, wherein the real-time plastic strain refers to the irreversible deformation of the concrete area to be tested due to the real-time shear strain.

[0127] In detail, the real-time plastic strain is calculated using a preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain, including:

[0128] According to the shear factor, shear elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the following shear-plastic transformation:

[0129]

[0130] Among them, ∈ S represents the real-time plastic strain, d represents the shear factor, ∈ represents the real-time shear strain, E represents the initial elastic modulus, and G represents the shear elastic modulus.

[0131] For example, the initial elastic modulus of a concrete area to be measured is 50 MPa, and the shear factor, shear elastic modulus and real-time shear strain of the concrete area to be measured are 0.8, 40 MPa and 5×10 -4 According to the shear factor, shear elastic modulus, initial elastic modulus and real-time shear strain, the real-time plastic strain can be calculated as: S =(1-0.8)×5×10 -4 ×50 / 40=1.25×10 -4 , the real-time plastic strain is calculated to be 1.25×10 -4 .

[0132] S7. Obtain the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and according to the real-time shear stress, use a preset historical relationship table to search for the number of damage signals, wherein the historical relationship table is a relationship table between the number of damage signals and the real-time shear stress constructed according to historical experimental data.

[0133] It should be explained that the real-time signal number refers to the number of real-time acoustic wave signals obtained under different external loads. The first row of the history relationship table represents the real-time external load, and the second row represents the number of damage signals. The corresponding number of damage signals can be found in the history relationship table according to the specific real-time external load.

[0134] Furthermore, historical experimental data refers to the number of damage signals under different real-time external loads obtained through multiple historical experiments, wherein the number of damage signals refers to the average number of multiple real-time acoustic wave signals obtained in multiple historical experiments when the multiple external loads of the multiple historical experiments are the real-time external loads, wherein the historical experiments refer to experiments conducted in the past on complete shear damage of concrete, and the specific standard of complete shear damage is set artificially according to specific requirements.

[0135] For example, a concrete processing plant conducted 5 separate shear damage experiments on concrete of the same material to obtain the historical experimental data. In the shear damage experiment, an external load was applied to a certain concrete area to be tested until it was detected that the structure of the concrete area to be tested had undergone complete shear damage, wherein the external load should be continuously increased. When the external loads in the 5 shear damage experiments were all 120 kN, the numbers of the 5 real-time acoustic wave signals obtained were 6, 5, 6, 6 and 7, respectively, and their average was calculated to be 6. Therefore, it can be obtained from the shear damage experiment that when the real-time external load was 120 kN, the number of damage signals was 6.

[0136] For example, in a certain measurement, the real-time external load borne by a certain concrete area to be measured is 120kN. Under the action of the real-time external load, the number of real-time acoustic wave signals obtained is 3. Therefore, when the real-time external load is 120kN, the number of acoustic wave signals is 3. The real-time external load is brought into the historical relationship table as an index, and it is found that when the real-time external load is 120kN, the number of damage signals is 6.

[0137] S8. Calculate the cumulative number of sound wave signals according to the real-time signal number, calculate the cumulative number of damage signals according to the damage signal number, and calculate the damage factor based on the cumulative number of sound wave signals and the cumulative number of damage signals.

[0138] It can be understood that the cumulative number of acoustic wave signals refers to the superposition of the real-time number of acoustic wave signals. The cumulative number of damage signals refers to the superposition of the number of damage signals. The damage factor refers to the ratio of the cumulative number of acoustic wave signals to the cumulative number of damage signals, which is used to characterize the degree of shear damage of the concrete area to be tested. For example, when the damage factor is 0, it means that the concrete area to be tested has no shear damage, and when the damage factor is 1, it means that the concrete area to be tested has completely shear damage.

[0139] In detail, the method of calculating the cumulative number of acoustic wave signals according to the number of real-time signals, calculating the cumulative number of damaged signals according to the number of damaged signals, and calculating the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damaged signals includes:

[0140] According to the real-time signal number, the cumulative sound wave signal number is calculated using the following formula:

[0141]

[0142] Among them, A L represents the number of accumulated acoustic wave signals, n represents the number of different real-time external loads currently collected, (A P ) i Indicates the number of real-time signals obtained for the i-th time, where A P represents the number of real-time signals received when the real-time external load is P, and i represents the real-time external load obtained for the i-th time;

[0143] The cumulative number of damage signals is calculated according to the real-time damage signal number using the following formula:

[0144]

[0145] Among them, A M represents the number of accumulated damage signals, n represents the number of summations, (A S ) i represents the number of damaged signals found for the i-th time;

[0146] The damage factor is calculated using the cumulative number of acoustic wave signals and the cumulative number of damage signals:

[0147]

[0148] Where D represents the damage factor, A L Indicates the number of accumulated sound wave signals, A M Indicates the number of accumulated damage signals.

[0149] Exemplarily, the real-time external loads borne by a certain concrete area to be tested obtained within 5 acquisition cycles are 100kN, 110kN, 120kN, 130kN and 140kN respectively, and the numbers of real-time signals obtained under the real-time external loads are 1, 2, 3, 4 and 5 respectively. According to the real-time external loads, the numbers of damage signals are found through the historical relationship table as 4, 5, 6, 7 and 8 respectively, then the cumulative number of acoustic wave signals is calculated to be 1+2+3+4+5=15, and the cumulative number of damage signals is 3+4+5+6+7=25. According to the cumulative number of acoustic wave signals and the cumulative number of damage signals, the damage factor is calculated to be 15 / 25=60%.

[0150] S9. A shear damage model is constructed based on the real-time plastic strain and damage factor, and the shear damage model is used to predict the shear damage of the concrete area to be tested.

[0151] In detail, the shear damage model is constructed according to the real-time plastic strain and damage factor, including:

[0152] The following shear damage model is constructed based on the damage factor and real-time plastic strain:

[0153]

[0154] Among them, ∈ SF represents the predicted plastic strain, D represents the damage factor, ∈ S represents the real-time plastic strain, D A and D B Indicates the preset damage parameters.

[0155] It should be explained that the shear damage model refers to a relationship between predicted plastic strain and real-time plastic strain constructed according to the damage factor, in which the relationship between predicted plastic strain and real-time plastic strain is different as the range of the damage factor is different. The damage parameter refers to the range of the damage factor set according to the specific situation.

[0156] It can be understood that the predicted plastic strain refers to the real-time plastic strain that may be generated in the concrete area to be tested in the future, which is obtained according to the real-time shear damage and the shear damage model.

[0157] For example, if the damage parameters set for a concrete area to be measured are 20% and 80% respectively, the shear damage model can be constructed as follows:

[0158]

[0159] It should be explained that the shear damage model expresses the following meanings: when the damage factor is less than 20%, it means that the damage of the concrete area to be tested is relatively slight, so it can be considered that the concrete area to be tested has not undergone irreversible plastic strain; when the damage factor is greater than 20% and less than 80%, it means that the damage of the concrete area to be tested is gradually changing from slight to severe, so it can be considered that the real-time plastic strain of the concrete area to be tested is slowly increasing; when the damage factor is greater than 80%, it means that the damage of the concrete area to be tested has become particularly serious, so it can be considered that the real-time plastic strain of the concrete area to be tested is rapidly increasing.

[0160] In detail, the shear damage prediction of the concrete area to be tested using the shear damage model includes:

[0161] According to the real-time plastic strain and the acquisition period, the shear damage model is used to perform periodic damage prediction on the concrete area to be tested to obtain the predicted plastic strain;

[0162] The predicted plastic strain is subjected to the following plastic-shear transformation to obtain the predicted shear strain:

[0163]

[0164] Among them, ∈ F represents the predicted shear strain, d represents the shear factor, G represents the shear elastic modulus, and E represents the initial elastic modulus;

[0165] Based on the predicted shear strain, the predicted load displacement is calculated using the following formula:

[0166] X F =∈ F ×L

[0167] Among them, X F To predict load displacement, L is the original thickness.

[0168] It should be explained that the predicted shear strain refers to the real-time shear strain that may be generated in the concrete area to be tested in the future. The predicted load displacement refers to the real-time load displacement that may be generated in the concrete area to be tested in the future. The predicted load displacement can be directly measured by the displacement sensor, so it can be used as a verification value to verify the correctness of the shear damage model.

[0169] For example, the original thickness of a concrete area to be measured is 1m, and the real-time plastic strain is 1.25×10 -4 , the damage factor is 60%, the initial elastic modulus is 50 MPa, the shear elastic modulus is 40 MPa and the shear factor is 0.8, then the predicted plastic strain calculated according to the shear damage model is 3.62×10 -4 According to the plastic-shear transformation of the predicted plastic strain, the predicted shear strain is 14.48×10 -4 , based on the predicted shear strain, the predicted load displacement is 0.14 cm.

[0170] In order to solve the problems described in the background technology, the present invention first uses a pre-constructed acoustic emission probe to obtain the original acoustic wave signal generated by fission inside the concrete area to be tested, so as to achieve accurate acquisition of the original acoustic wave signal and provide a premise for subsequent shear damage analysis. The original acoustic wave signal is processed by a pre-constructed acoustic emission processing unit to obtain a real-time acoustic wave signal, so that the shear damage prediction eliminates the interference of noise signals and enhances the clarity of the signal. Further, by measuring the real-time external load and the real-time load displacement, the dynamic acquisition of the state of the concrete area to be tested is achieved, which provides conditions for the subsequent calculation of dynamic shear stress and shear strain. According to the real-time shear stress and the real-time shear strain, the dynamic shear stress and the shear strain can be obtained, which improves the accuracy of the prediction. Since the real-time shear stress and the real-time shear strain change dynamically according to the state of the concrete area to be tested, the shear elastic modulus calculated according to the real-time shear stress and the real-time shear strain is also dynamic, which avoids the deviation of the calculated elastic modulus from the actual situation due to changes in the structure of the concrete area to be tested. By calculating the shear factor, the damage caused by the shear stress in the concrete area to be tested is intuitively displayed. The real-time plastic strain is calculated by shear-plastic transformation, and the real-time shear strain is converted into real-time plastic strain, which characterizes the irreversible shear strain occurring in the concrete area to be tested. By obtaining the real-time signal number and calculating the cumulative number of acoustic wave signals according to the real-time signal number, the damage of the concrete area to be tested caused by the real-time external load is intuitively displayed. By finding the number of damage signals and calculating the cumulative number of damage signals according to the number of damage signals, the historical damage of the concrete area to be tested under the real-time external load is clearly displayed. Based on the cumulative number of acoustic wave signals and the cumulative number of damage signals, the damage factor is calculated, which realizes an intuitive description of the damage process of the concrete area to be tested. A shear damage model is constructed based on the real-time plastic strain and the damage factor, which realizes a rapid prediction of the damage condition of the concrete area to be tested. Therefore, the present invention can improve the speed of concrete damage prediction and enhance the accuracy of concrete damage prediction.

[0171] like Figure 2 , which is a functional module diagram of a concrete shear damage prediction system based on acoustic emission technology provided by an embodiment of the present invention.

[0172] The concrete shear damage prediction system 100 based on acoustic emission technology of the present invention can be installed in an electronic device. According to the functions to be implemented, the concrete shear damage prediction system 100 based on acoustic emission technology can include a real-time data acquisition module 101, a stress-strain calculation module 102, a strain-plastic transformation module 103 and a damage model construction module 104. The module of the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0173] The real-time data acquisition module 101 is used to obtain the original sound wave signal generated by fission inside the concrete area to be tested by using a pre-built acoustic emission probe, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor, and uses a pre-built acoustic emission processing unit to perform signal processing on the original sound wave signal to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter;

[0174] The stress-strain calculation module 102 is used to measure the real-time external load on the concrete area to be measured by using the load sensor, measure the real-time load displacement of the concrete area to be measured by using the displacement sensor, calculate the real-time shear stress according to the real-time external load and a preset contact area, and calculate the real-time shear strain according to the real-time load displacement and a preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured;

[0175] The strain-plastic transformation module 103 is used to calculate the shear elastic modulus according to the real-time shear stress and the real-time shear strain, calculate the shear factor according to the shear elastic modulus and the preset initial elastic modulus, and calculate the real-time plastic strain by using the preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain;

[0176] The damage model construction module 104 is used to obtain the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and to search for the damage signal number according to the real-time shear stress using a preset historical relationship table, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data, calculate the cumulative acoustic wave signal number according to the real-time signal number, calculate the cumulative damage signal number according to the damage signal number, calculate the damage factor based on the cumulative acoustic wave signal number and the cumulative damage signal number, construct a shear damage model according to the real-time plastic strain and the damage factor, and use the shear damage model to predict the shear damage of the concrete area to be tested.

[0177] In detail, each module in the concrete shear damage prediction system 100 based on acoustic emission technology in the embodiment of the present invention is used in the same manner as described above. Figure 1 The concrete shear damage prediction method based on acoustic emission technology described in the previous section is the same technical means and can produce the same technical effect, so it will not be repeated here.

[0178] like Figure 3 FIG. 1 is a schematic diagram of the structure of an electronic device for implementing a method for predicting concrete shear damage based on acoustic emission technology according to an embodiment of the present invention.

[0179] The electronic device 1 may include a processor 10, a memory 11 and a bus 12, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a concrete shear damage prediction method program based on acoustic emission technology.

[0180] The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of the electronic device 1, such as a mobile hard disk of the electronic device 1. In other embodiments, the memory 11 may also be an external storage device of the electronic device 1, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 11 also includes an internal storage unit of the electronic device 1 and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device 1, such as the code of the concrete shear damage prediction method program based on acoustic emission technology, but also can be used to temporarily store data that has been output or is to be output.

[0181] The processor 10 may be composed of an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips, etc. The processor 10 is the control core (Control Unit) of the electronic device, and uses various interfaces and lines to connect various components of the entire electronic device, and executes or executes programs or modules stored in the memory 11 (such as a concrete shear damage prediction method program based on acoustic emission technology, etc.), and calls data stored in the memory 11 to execute various functions of the electronic device 1 and process data.

[0182] The bus 12 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 12 may be divided into an address bus, a data bus, a control bus, etc. The bus 12 is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0183] Figure 3 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0184] For example, although not shown, the electronic device 1 may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, etc. The electronic device 1 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0185] Furthermore, the electronic device 1 may also include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0186] Optionally, the electronic device 1 may further include a user interface, which may be a display, an input unit (such as a keyboard), or a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device 1 and to display a visual user interface.

[0187] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0188] The concrete shear damage prediction method program based on acoustic emission technology stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve:

[0189] The original sound wave signal generated by fission inside the concrete area to be tested is obtained by using a pre-built acoustic emission probe, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor;

[0190] The original sound wave signal is processed by using a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter;

[0191] The load sensor is used to measure the real-time external load on the concrete area to be tested, and the displacement sensor is used to measure the real-time load displacement of the concrete area to be tested;

[0192] Calculate the real-time shear stress according to the real-time external load and the preset contact area, and calculate the real-time shear strain according to the real-time load displacement and the preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured;

[0193] Calculating the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculating the shear factor according to the shear elastic modulus and a preset initial elastic modulus;

[0194] According to the shear factor, shear elastic modulus, initial elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the preset shear-plastic transformation;

[0195] Acquire the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and search for the damage signal number using a preset historical relationship table according to the real-time shear stress, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data;

[0196] Calculate the cumulative number of acoustic wave signals according to the number of real-time signals, calculate the cumulative number of damage signals according to the number of damage signals, and calculate the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damage signals;

[0197] A shear damage model is constructed based on the real-time plastic strain and damage factor, and the shear damage model is used to predict the shear damage of the concrete area to be tested.

[0198] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figures 1 to 3The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0199] Furthermore, if the module / unit integrated in the electronic device 1 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0200] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement:

[0201] The original sound wave signal generated by fission inside the concrete area to be tested is obtained by using a pre-built acoustic emission probe, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor;

[0202] The original sound wave signal is processed by using a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter;

[0203] The load sensor is used to measure the real-time external load on the concrete area to be tested, and the displacement sensor is used to measure the real-time load displacement of the concrete area to be tested;

[0204] Calculate the real-time shear stress according to the real-time external load and the preset contact area, and calculate the real-time shear strain according to the real-time load displacement and the preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured;

[0205] Calculating the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculating the shear factor according to the shear elastic modulus and a preset initial elastic modulus;

[0206] According to the shear factor, shear elastic modulus, initial elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the preset shear-plastic transformation;

[0207] Acquire the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and search for the damage signal number using a preset historical relationship table according to the real-time shear stress, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data;

[0208] Calculate the cumulative number of acoustic wave signals according to the number of real-time signals, calculate the cumulative number of damage signals according to the number of damage signals, and calculate the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damage signals;

[0209] A shear damage model is constructed based on the real-time plastic strain and damage factor, and the shear damage model is used to predict the shear damage of the concrete area to be tested.

[0210] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only illustrative, and actual implementation may have other division methods.

[0211] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0212] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0213] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0214] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the system claim can also be implemented by one unit or device through software or hardware. The second and other words are used to indicate names, but not to indicate any particular order.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for predicting concrete shear damage based on acoustic emission technology, characterized in that: The method comprises: The original sound wave signal generated by fission inside the concrete area to be tested is obtained by using a pre-built acoustic emission probe, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor and a displacement sensor; The original sound wave signal is processed by using a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter; The load sensor is used to measure the real-time external load on the concrete area to be tested, and the displacement sensor is used to measure the real-time load displacement of the concrete area to be tested; Calculate the real-time shear stress according to the real-time external load and the preset contact area, and calculate the real-time shear strain according to the real-time load displacement and the preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured; Calculating the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculating the shear factor according to the shear elastic modulus and a preset initial elastic modulus; According to the shear factor, shear elastic modulus, initial elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the preset shear-plastic transformation; Acquire the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and search for the damage signal number using a preset historical relationship table according to the real-time shear stress, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data; Calculate the cumulative number of acoustic wave signals according to the number of real-time signals, calculate the cumulative number of damage signals according to the number of damage signals, and calculate the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damage signals; A shear damage model is constructed based on the real-time plastic strain and damage factor, and the shear damage model is used to predict the shear damage of the concrete area to be tested.

2. The method for predicting concrete shear damage based on acoustic emission technology according to claim 1, characterized in that: The method of using a pre-built acoustic emission probe to obtain the original sound wave signal generated by fission inside the concrete area to be tested includes: The acoustic emission probe is fixed on the surface of the concrete area to be tested by using a pre-constructed coupling agent to obtain a positioning acoustic emission probe, wherein the coupling agent is a vacuum gel; According to the preset collection cycle, set the collection frequency of the positioning acoustic emission probe; According to the acquisition frequency, the original sound wave vibration generated by fission inside the concrete area to be tested is collected by using a positioning acoustic emission probe; The original sound wave vibration is converted into an original sound wave signal by using a pre-built piezoelectric element, wherein the material of the piezoelectric element is barium titanate and is built into the acoustic emission probe.

3. The method for predicting concrete shear damage based on acoustic emission technology according to claim 2, characterized in that: The method of using a pre-built acoustic emission processing unit to process the original acoustic wave signal to obtain a real-time acoustic wave signal includes: Amplifying the original sound wave signal using a signal amplifier to obtain an amplified sound wave signal; Identifying a noise sound wave signal in the amplified sound wave signal according to a preset signal amplitude range, wherein the noise sound wave signal includes: an environmental noise signal, an electromagnetic interference signal, and an instrument vibration signal; The noise sound wave signal is filtered by using a signal filter to obtain a real-time sound wave signal.

4. The method for predicting concrete shear damage based on acoustic emission technology according to claim 1, characterized in that: The method of calculating the real-time shear stress according to the real-time external load and the preset contact area, and calculating the real-time shear strain according to the real-time load displacement and the preset original thickness includes: According to the real-time external load and the contact area, the real-time shear stress is calculated using the following formula: Among them, σ represents the real-time shear stress, P represents the real-time external load, and S represents the contact area; According to the real-time load displacement and original thickness, the real-time shear strain is calculated using the following formula: Where ∈ represents the real-time shear strain, X represents the real-time load displacement, and L represents the original thickness.

5. The method for predicting concrete shear damage based on acoustic emission technology according to claim 4, characterized in that: The step of calculating the shear elastic modulus according to the real-time shear stress and the real-time shear strain, and calculating the shear factor according to the shear elastic modulus and a preset initial elastic modulus, comprises: According to the real-time shear stress and real-time shear strain, the shear elastic modulus is calculated using the following formula: Where G represents the shear elastic modulus, γ represents the real-time shear stress, and ∈ represents the real-time shear strain; According to the preset initial elastic modulus and the shear elastic modulus, the shear factor is calculated using the following formula: Where d represents the shear factor and E represents the initial elastic modulus.

6. The method for predicting concrete shear damage based on acoustic emission technology according to claim 5, characterized in that: The method of calculating the real-time plastic strain by using a preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain comprises: According to the shear factor, shear elastic modulus and real-time shear strain, the real-time plastic strain is calculated using the following shear-plastic transformation: Among them, ∈ S represents the real-time plastic strain, d represents the shear factor, ∈ represents the real-time shear strain, E represents the initial elastic modulus, and G represents the shear elastic modulus.

7. The method for predicting concrete shear damage based on acoustic emission technology according to claim 3, characterized in that: The method of calculating the cumulative number of acoustic wave signals according to the number of real-time signals, calculating the cumulative number of damaged signals according to the number of damaged signals, and calculating the damage factor based on the cumulative number of acoustic wave signals and the cumulative number of damaged signals includes: According to the real-time signal number, the cumulative sound wave signal number is calculated using the following formula: Among them, A L represents the number of accumulated acoustic wave signals, n represents the number of different real-time external loads currently collected, (A P ) i Indicates the number of real-time signals obtained for the i-th time, where A P represents the number of real-time signals received when the real-time external load is P, and i represents the real-time external load obtained for the i-th time; The cumulative number of damage signals is calculated according to the real-time damage signal number using the following formula: Among them, A M represents the number of accumulated damage signals, n represents the number of summations, (A S ) i represents the number of damaged signals found for the i-th time; The damage factor is calculated using the cumulative number of acoustic wave signals and the cumulative number of damage signals: Where D represents the damage factor, A L Indicates the number of accumulated sound wave signals, A M Indicates the number of accumulated damage signals.

8. The method for predicting concrete shear damage based on acoustic emission technology according to claim 7, characterized in that: The shear damage model is constructed according to the real-time plastic strain and damage factor, including: The following shear damage model is constructed based on the damage factor and real-time plastic strain: Among them, ∈ SF represents the predicted plastic strain, D represents the damage factor, ∈ S represents the real-time plastic strain, D A and D B Indicates the preset damage parameters.

9. The method for predicting concrete shear damage based on acoustic emission technology according to claim 8, characterized in that: The method of using the shear damage model to predict the shear damage of the concrete area to be tested includes: According to the real-time plastic strain and the acquisition period, the shear damage model is used to perform periodic damage prediction on the concrete area to be tested to obtain the predicted plastic strain; The predicted plastic strain is subjected to the following plastic-shear transformation to obtain the predicted shear strain: Among them, ∈ F represents the predicted shear strain, d represents the shear factor, G represents the shear elastic modulus, and E represents the initial elastic modulus; Based on the predicted shear strain, the predicted load displacement is calculated using the following formula: X F =∈ F ×L Among them, X F To predict load displacement, L is the original thickness.

10. A concrete shear damage prediction system based on acoustic emission technology, characterized in that: The system comprises: A real-time data acquisition module is used to use a pre-built acoustic emission probe to acquire the original sound wave signal generated by fission inside the concrete area to be tested, wherein the acoustic emission probe is built in an acoustic emission detection unit, and the acoustic emission detection unit includes: an acoustic emission probe, a load sensor, and a displacement sensor. The original sound wave signal is processed by a pre-built acoustic emission processing unit to obtain a real-time sound wave signal, wherein the acoustic emission processing unit includes: a signal amplifier and a signal filter; A stress-strain calculation module, used to measure the real-time external load on the concrete area to be measured by using the load sensor, measure the real-time load displacement of the concrete area to be measured by using the displacement sensor, calculate the real-time shear stress according to the real-time external load and a preset contact area, and calculate the real-time shear strain according to the real-time load displacement and a preset original thickness, wherein the contact area is the contact area between the load sensor and the concrete area to be measured, and the original thickness is the original thickness of the concrete area to be measured; A strain-plastic transformation module is used to calculate the shear elastic modulus according to the real-time shear stress and the real-time shear strain, calculate the shear factor according to the shear elastic modulus and the preset initial elastic modulus, and calculate the real-time plastic strain by using the preset shear-plastic transformation according to the shear factor, the shear elastic modulus, the initial elastic modulus and the real-time shear strain; A damage model construction module is used to obtain the real-time signal number of the real-time acoustic wave signal received under different real-time external loads, and to search for the damage signal number according to the real-time shear stress using a preset historical relationship table, wherein the historical relationship table is a relationship table between the damage signal number and the real-time shear stress constructed according to historical experimental data, calculate the cumulative acoustic wave signal number according to the real-time signal number, calculate the cumulative damage signal number according to the damage signal number, calculate the damage factor based on the cumulative acoustic wave signal number and the cumulative damage signal number, construct a shear damage model according to the real-time plastic strain and the damage factor, and use the shear damage model to predict the shear damage of the concrete area to be tested.

Images