CN116858667A - Method and device for detecting fatigue life of steel crane beam - Google Patents
Method and device for detecting fatigue life of steel crane beam Download PDFInfo
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Abstract
The application provides a method and a device for detecting fatigue life of a steel crane beam, belonging to the field of mechanical engineering, wherein the method comprises the following steps: carrying out dynamic strain test on the steel crane beam, continuously collecting measuring point dynamic stress of a plurality of measuring points of the crane beam, and obtaining a stress spectrum of each measuring point; determining a reliable index value according to the range condition of the steel crane beam detectable component; calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of cycles counted in the stress spectrum in a preset range; and determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point. According to the method, the fatigue reliability index is related to the service life and the actual measurement equivalent stress amplitude, the reliability index and the failure probability are subjected to standard normal distribution, the service life can be judged according to the reliability index, and the failure probability of the crane beam member can be calculated, so that the actual condition of the member is combined, and the economic residual fatigue life can be calculated under the condition of ensuring the reliability.
Description
Technical Field
The application relates to the field of mechanical engineering, in particular to a method and a device for detecting fatigue life of a steel crane beam.
Background
In the early development stage of the metallurgical industry, due to the insufficient knowledge of the fatigue of the steel structure, the standard requirements are also lacking in the aspect of the fatigue design of the steel crane beam, so that the accidents of the crane beam fracture and collapse caused by the fatigue damage of more heavy working cranes are caused, and the life and property safety is greatly endangered. The fatigue damage is mainly caused by the fact that all stressed parts of the steel crane girder need to bear cyclic alternating load under the normal working state, the cyclic alternating load has the characteristic of low speed and heavy load, when the equivalent stress amplitude is higher than the fatigue cut-off limit, fatigue damage can be caused, and fatigue cracks can develop to finally cause the fatigue damage of the whole crane girder.
In order to evaluate the remaining fatigue life of steel crane beams, the method currently in common use is by means of a steel crane Liang JinDynamic stress spectrum is obtained by dynamic strain test, and each stress amplitude delta sigma is obtained by statistics of dynamic stress spectrum by a rain flow method i And number of cyclesFinally, calculating T according to a residual fatigue life calculation formula:
wherein ,T* To measure the total time; c (C) z 、β z Parameters related to the component and the connection class, respectively; t (T) 0 Time that has been used for the structure;taking 1.5-3.0 for additional safety coefficient, taking lower value when the total measurement time is longer, and taking 2.0 when the total measurement time of the crane beam in the steelmaking and continuous casting workshop of the metallurgical factory is 24 hours; Δσ i The stress amplitude (N/mm 2) of the ith level of the measured part obtained by statistics according to a stress-time curve by a rain flow method; />For measuring time T * In, Δσ i Is a number of cycles; t is the evaluation time of the remaining fatigue life, its unit should be equal to T * 、T 0 And consistent.
The existing residual fatigue life calculation method is controlled by an additional safety coefficient, belongs to a semi-empirical semi-probability method, and is low in reliability of calculation results.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides a method and a device for detecting the fatigue life of a steel crane beam.
The application provides a method for detecting fatigue life of a steel crane beam, which comprises the following steps: the method comprises the steps of continuously collecting measuring point dynamic stress of a plurality of measuring points of a steel crane beam by carrying out dynamic strain test on the steel crane beam, and obtaining a stress spectrum of each measuring point; determining a reliable index value according to the range condition of the steel crane beam detectable component; calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of stress cycles in a preset range counted in a stress spectrum; and determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
According to the method for detecting the fatigue life of the steel crane girder, provided by the application, the residual fatigue life of each measuring point is calculated according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of cycles counted in the stress spectrum and within a preset range, and the method comprises the following steps:
wherein ,
wherein ,Δσe Is equivalent to the stress amplitude, T 0 For the used time, T is the residual fatigue life, ne is the total number of stress cycles within a preset range counted in a stress spectrum in unit time, C z 、β z Delta for material property parameters related to component and connection class c Is the material performance parameter C z Is a coefficient of variation of (a).
According to the method for detecting the fatigue life of the steel crane beam, which is provided by the application, the reliable index value is determined according to the range condition of the steel crane beam detectable component, and the method comprises the following steps: respectively determining a minimum reliability index value and a maximum reliability index value according to the two conditions that the component can be fully inspected and the component cannot be inspected; and for the part-inspectable condition of the component, based on the minimum reliable index value and the maximum reliable index value, obtaining a corresponding reliable index value according to proportional linear interpolation.
According to the method for detecting the fatigue life of the steel crane beam, after the reliable index value is determined according to the range condition of the steel crane beam detectable component, the method further comprises the following steps: determining the failure probability of the steel crane beam according to the reliable index value based on the standard normal distribution relation which is satisfied by the reliable index value and the failure probability; accordingly, the determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point comprises the following steps: and determining the fatigue life of the steel crane girder according to the measuring point with the minimum residual fatigue life and combining the failure probability.
According to the method for detecting the fatigue life of the steel crane girder, after the stress spectrum of each measuring point is obtained, the method further comprises the following steps: constructing a model by finite element analysis on the steel crane beam, and calculating a stress value of a maximum stress position; if the stress of the position with the largest stress is larger than the dynamic stress of all the measuring points, carrying out fatigue strength checking calculation on the position with the largest stress; if the fatigue strength does not meet the design requirement, the subsequent processes of determining the reliable index value and determining the fatigue life are terminated, and the position with the largest stress is judged to need reinforcement treatment.
According to the method for detecting the fatigue life of the steel crane beam, provided by the application, if the dynamic stress of any measuring point is larger than the stress of the maximum part of the stress, the defect or damage exists at the measuring point part or around the measuring point.
According to the method for detecting the fatigue life of the steel crane girder provided by the application, after the stress spectrum of each measuring point is obtained, the method further comprises the following steps: constructing a model by finite element analysis on the steel crane beam, and calculating stress of each measuring point; if the dynamic stress of the measuring point exceeding the preset number is inconsistent with the finite element calculation result, or if the dynamic stress of a certain measuring point part is different from the finite element calculation result by more than the preset condition, reconstructing a model, and calculating the stress of each measuring point through finite element analysis until the number of the inconsistent dynamic stress of the measuring point part and the finite element calculation result is less than the preset number, and the dynamic stress of any measuring point part is different from the finite element calculation result by less than the preset condition.
The application also provides a device for detecting the fatigue life of the steel crane girder, which comprises the following components: the detection module is used for continuously collecting the measuring point dynamic stress of a plurality of measuring points of the crane beam by carrying out dynamic strain test on the steel crane beam to obtain a stress spectrum of each measuring point; the analysis module is used for determining a reliable index value according to the range condition of the steel crane beam detectable component; the processing module is used for determining the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent positive stress amplitude and the total number of stress cycles counted in the stress spectrum within a preset range; and the evaluation module is used for determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
The application also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for detecting the fatigue life of the steel crane girder according to any one of the above when executing the program.
The application also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of detecting fatigue life of a steel crane beam as described in any of the above.
According to the method and the device for detecting the fatigue life of the steel crane beam, the fatigue reliability index is related to the service life and the actual measurement equivalent stress amplitude, and meanwhile, the reliability index and the failure probability are subject to the standard normal distribution function relation, so that the service life can be judged according to the reliability index, the failure probability of the crane beam member can be calculated, the actual condition of the member can be combined, and the economic residual fatigue life can be calculated under the condition that certain reliability is ensured.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for detecting fatigue life of a steel crane beam provided by the application;
FIG. 2 is a schematic structural view of a steel crane beam fatigue life detection device provided by the application;
fig. 3 is a schematic structural diagram of an electronic device provided by the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The method and apparatus for detecting fatigue life of steel crane beam according to the present application will be described with reference to fig. 1 to 3. FIG. 1 is a schematic flow chart of a method for detecting fatigue life of a steel crane beam, as shown in FIG. 1, comprising the steps of:
101. and (3) continuously collecting the measuring point dynamic stress of a plurality of measuring points of the crane beam by carrying out dynamic strain test on the steel crane beam, so as to obtain the stress spectrum of each measuring point.
The parts of the crane beam which are easy to generate fatigue damage are usually arranged at the joint weld between the web plate and the upper flange and the web plate nearby, the beam end of the variable-section crane beam and the crane limb column head. Therefore, these positions can be set as measurement points, and in order to improve accuracy, a plurality of measurement points are generally provided. By carrying out dynamic strain test on the steel crane beam, the strain sensor and the automatic acquisition instrument can be used for testing the measuring point dynamic stress of the damaged part of the crane Liang Yisun under normal production conditions. Wherein the acquisition duration, i.e. the test duration, is typically not less than 24 hours.
102. And determining a reliable index value according to the range condition of the steel crane beam detectable component.
In some embodiments, the determining a reliability index value based on steel crane beam detectable member range conditions comprises: respectively determining a minimum reliability index value and a maximum reliability index value according to the two conditions that the component can be fully inspected and the component cannot be inspected; and for the part-inspectable condition of the component, based on the minimum reliable index value and the maximum reliable index value, obtaining a corresponding reliable index value according to proportional linear interpolation.
For example, the fatigue target reliability index range suggested in ISO 13822 by structural design basis, assessment of existing structures: 2.3-3.1, according to the field detectable component range conditions, summarizing the values of the reliability index beta (T) according to the following table 1:
TABLE 1 value table of residual fatigue life reliability index beta (T)
103. And calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of stress cycles counted in the stress spectrum within a preset range.
The S-N curve is a curve which takes the fatigue strength of a standard test piece of a material as an ordinate and takes the logarithmic value lg N of the fatigue life as an abscissa, and represents the relation between the fatigue strength and the fatigue life of the standard test piece under certain cycle characteristics, and is also called a stress-life curve. According to the details of the components and the connection, the material performance parameter beta of the S-N curve can be obtained through test or specification z 、C z And its statistical parameters, as described in detail in the background of the application. The material performance parameter beta can also be determined by the steel structure design standard z and Cz 。
In some embodiments, the remaining fatigue life of each measurement point is calculated based on the material performance parameter, the reliability index value, the equivalent stress amplitude, and the total number of stress cycles within a predetermined range counted in the stress spectrum, including the following formula:
wherein ,
wherein ,Δσe Is equivalent to the stress amplitude, T 0 For the used time, T is the residual fatigue life, ne is the total number of stress cycles within a preset range counted in a stress spectrum in unit time, C z 、β z Delta for material property parameters related to component and connection class c Is the material performance parameter C z Coefficient of variation of (2)
In particular, for in-service steel crane beams, due to the randomness of the load, the Miner accumulated damage theory is suitable for obtaining the average service life. The accumulated damage D (T) comprises two parts, one is the elapsed time T 0 The damage generated in the future time T is obtained by the following formula:
wherein Dc is a critical damage value, generally 1.0; beta z Typically 3.0; generally Ne is in units of time, in the stress spectrumRange and-> Sum of stress cycles in the range (i.e. preset range), Δσ i The stress amplitude of the ith level of the measured part is obtained by statistics according to a stress-time curve by a rain flow method; Δσ e Is equivalent stress amplitude (MPa).
If the conditions of use are unchanged, i.e. DeltaSigma e ＝Δσ′ e 、N e ＝N′ e Then formula (1) is rewritten as the following formula (2):
considering that Ne and Dc generally obey the lognormal distribution, the variation coefficients thereof are both 0.3, and in the present application, the reliability index value is calculated as:
wherein ,
wherein ,δc Is the material performance parameter C z The variation coefficient of (2) is generally (0.04-0.08) obtained through the statistics of the fatigue S-N curve of the component connection; cz is the correlation coefficient between the components and the connection, and is queried according to a table 16.2.1-1 in steel structural design Standard GB50017-2017, and the same beta z Or can be directly valued from the standard specification.
The stress amplitude delta sigma can be obtained by the stress-time history curve of the field test and the past load history through the cycle statistics counting (rain flow method) i And distribution of Ne and its statistical parameters.
104. And determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
And analyzing all possible fatigue measuring points, calculating to obtain the minimum life, namely the calculated residual fatigue life, and evaluating the economy of the residual fatigue life through failure probability.
According to the method for detecting the fatigue life of the steel crane beam, the fatigue reliability index is related to the service life and the actual measured equivalent stress amplitude, and meanwhile, the reliability index and the failure probability are subject to the standard normal distribution function relation, so that the service life can be judged according to the reliability index, the failure probability of the crane beam member can be calculated, the actual condition of the member can be combined, and the economic residual fatigue life can be calculated under the condition that a certain reliability is ensured.
In some embodiments, after determining the reliability index value according to the steel crane beam detectable member range condition, the method further comprises: determining the failure probability of the steel crane beam according to the reliable index value based on the standard normal distribution relation which is satisfied by the reliable index value and the failure probability; accordingly, the determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point comprises the following steps: and determining the fatigue life of the steel crane girder according to the measuring point with the minimum residual fatigue life and combining the failure probability.
Specifically, failure probability P t Obeys a standard normal distribution relationship with beta (T):
calculating corresponding failure probability P according to the reliability index beta (T) t And then evaluating the fatigue life of the steel crane girder according to the failure probability. For example, failure probability P t The calculations are shown in table 2 below:
TABLE 2
In some embodiments, after obtaining the stress spectrum of each measurement point, the method further includes: constructing a model by finite element analysis on the steel crane beam, and calculating a stress value of a maximum stress position; if the stress of the position with the largest stress is larger than the dynamic stress of all the measuring points, carrying out fatigue strength checking calculation on the position with the largest stress; if the fatigue strength does not meet the design requirement, the subsequent processes of determining the reliable index value and determining the fatigue life are terminated, and the position with the largest stress is judged to need reinforcement treatment.
In the existing method, because the number of the measuring points is limited, and the strain sensor of each measuring point can only reflect the stress amplitude of the point, if the weakest part of the whole component is found out through actually measuring the stress amplitude, and if the design requirement is met or not through fatigue strength checking, dense measuring points are required to be arranged, so that the testing cost is high, and compared with the manufacturing cost of a crane beam, the method is neither economical nor practical.
In the embodiment of the application, the weak part of the structure can be found out by combining dynamic strain test with finite element analysis, and the fatigue strength can be checked. Because the actual measuring point position does not necessarily reflect the maximum stress amplitude of the crane girder, modeling analysis can be carried out by finite element analysis software, and the maximum stress amplitude position, namely the weak position for checking the fatigue strength, is calculated.
According to the embodiment of the application, the availability of the actual measurement result can be verified by using the calculation result of the model, when the stress amplitude at the maximum stress position in the model is higher than that of the actual measurement position, fatigue strength checking can be carried out on the position according to steel structural design Specification GB50017-2017, and when the fatigue strength requirement is not met, subsequent reinforcement treatment can be guided, subsequent fatigue life detection is not needed, and unreliable results are avoided to be used for guiding actual production.
According to the method for detecting the fatigue life of the steel crane beam, provided by the embodiment of the application, the defects that the whole section and the weakest part of the whole member cannot be accurately embodied due to the limited number of the measuring points are overcome by combining the on-site actual measurement with the finite element analysis, so that the fatigue strength is more accurately estimated, the selection of the measuring points for fatigue life estimation is further guided, and if the fatigue strength does not meet the design requirement, the unreliable fatigue life can be prevented from being used as a detection result, thereby improving the practical use safety of the steel crane beam.
In some embodiments, if the dynamic stress of any measuring point is greater than the stress of the maximum part, then the defect or damage exists at the measuring point part or around the measuring point.
Specifically, if the dynamic stress of the measuring point is greater than the stress of the maximum part (specifically, the stress of the measuring point is obviously greater than the calculated result of the model, that is, the stress exceeds a certain range), the defect and damage exist at or around the measuring point, so that the subsequent reinforcement treatment can be guided.
In some embodiments, after the calculating the stress value of the maximum part by performing finite element analysis on the steel crane beam to construct a model, the method further comprises: calculating stress of each measuring point through finite element analysis; if the dynamic stress of the measuring point exceeding the preset number is inconsistent with the finite element calculation result, or if the dynamic stress of a certain measuring point part is different from the finite element calculation result by more than the preset condition, reconstructing a model, and calculating the stress of each measuring point through finite element analysis until the number of the inconsistent dynamic stress of the measuring point part and the finite element calculation result is less than the preset number, and the dynamic stress of any measuring point part is different from the finite element calculation result by less than the preset condition.
The embodiment of the application can also verify the rationality of the calculation model by using the actual measurement result, specifically, the preset number can be set to be the majority, and if the dynamic stress of most measuring points is consistent with the finite element calculation result, the calculation model can be judged to be more reasonable. When the stress of most measuring point positions is mostly inconsistent with the finite element calculation result or has larger difference (namely preset conditions can be specifically set), whether the model design is reasonable or not needs to be checked, and the parts, materials, assembly, constraint, load action and the like of the model are checked one by one, so that the model is reconstructed until the calculation result is approximately the same as the actual measurement result.
The steel crane girder fatigue life detection device provided by the application is described below, and the steel crane girder fatigue life detection device described below and the steel crane girder fatigue life detection method described above can be referred to correspondingly.
Fig. 2 is a schematic structural view of a steel crane beam fatigue life detecting device provided by the application, and as shown in fig. 2, the steel crane beam fatigue life detecting device includes: a detection module 201, an analysis module 202, a processing module 203 and an evaluation module 204. The detection module 201 is used for continuously collecting the measuring point dynamic stress of a plurality of measuring points of the crane beam by carrying out dynamic strain test on the steel crane beam to obtain a stress spectrum of each measuring point; the analysis module 202 is used for determining a reliable index value according to the range condition of the steel crane beam detectable component; the processing module 203 is configured to determine a remaining fatigue life of each measurement point according to the material performance parameter, the reliability index value, the equivalent positive stress amplitude, and the total number of cycles counted in the stress spectrum within a preset range; the evaluation module 204 is configured to determine a steel crane beam fatigue life based on the remaining fatigue life at each of the stations.
The embodiment of the device provided by the embodiment of the present application is for implementing the above embodiments of the method, and specific flow and details refer to the above embodiments of the method, which are not repeated herein.
The fatigue life detection device for the steel crane girder provided by the embodiment of the application has the same implementation principle and technical effects as those of the embodiment of the fatigue life detection method for the steel crane girder, and for the sake of brief description, reference can be made to corresponding contents in the embodiment of the fatigue life detection method for the steel crane girder where the embodiment of the fatigue life detection device for the steel crane girder is not mentioned.
Fig. 3 is a schematic structural diagram of an electronic device provided by the present application, and as shown in fig. 3, the electronic device may include: processor 301, communication interface (Communications Interface) 302, memory (memory) 303 and communication bus 304, wherein processor 301, communication interface 302, memory 303 accomplish the communication between each other through communication bus 304. The processor 301 may invoke logic instructions in the memory 303 to perform a steel crane beam fatigue life detection method comprising: the method comprises the steps of continuously collecting measuring point dynamic stress of a plurality of measuring points of a steel crane beam by carrying out dynamic strain test on the steel crane beam, and obtaining a stress spectrum of each measuring point; determining a reliable index value according to the range condition of the steel crane beam detectable component; calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of cycles counted in the stress spectrum in a preset range; and determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
Further, the logic instructions in the memory 303 may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present application also provides a non-transitory computer readable storage medium having stored thereon a computer program which when executed by a processor is implemented to perform the method for detecting fatigue life of a steel crane beam provided by the above methods, the method comprising: the method comprises the steps of continuously collecting measuring point dynamic stress of a plurality of measuring points of a steel crane beam by carrying out dynamic strain test on the steel crane beam, and obtaining a stress spectrum of each measuring point; determining a reliable index value according to the range condition of the steel crane beam detectable component; calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of cycles counted in the stress spectrum in a preset range; and determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The method for detecting the fatigue life of the steel crane beam is characterized by comprising the following steps of:
the method comprises the steps of continuously collecting measuring point dynamic stress of a plurality of measuring points of a steel crane beam by carrying out dynamic strain test on the steel crane beam, and obtaining a stress spectrum of each measuring point;
determining a reliable index value according to the range condition of the steel crane beam detectable component;
calculating the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of stress cycles in a preset range counted in a stress spectrum;
and determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
2. The method for detecting the fatigue life of the steel crane girder according to claim 1, wherein the calculating the remaining fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent stress amplitude and the total number of cycles counted in the stress spectrum within a preset range comprises the following formula:
wherein ,
wherein, beta (T) is a reliable index value, delta sigma e Is equivalent to the stress amplitude, T 0 For the used time, T is the residual fatigue life, ne is the total number of stress cycles within a preset range counted in a stress spectrum in unit time, C z 、β z Delta for material property parameters related to component and connection class c Is the material performance parameter C z Is a coefficient of variation of (a).
3. The method for detecting fatigue life of steel crane beam according to claim 1, wherein the determining a reliability index value according to a condition of a range of a steel crane beam detectable member comprises:
respectively determining a minimum reliability index value and a maximum reliability index value according to the two conditions that the component can be fully inspected and the component cannot be inspected;
and for the part-inspectable condition of the component, based on the minimum reliable index value and the maximum reliable index value, obtaining a corresponding reliable index value according to proportional linear interpolation.
4. The method for detecting fatigue life of steel crane beam according to claim 1, wherein after determining the reliability index value according to the condition of the range of the steel crane beam detectable member, further comprising:
determining the failure probability of the steel crane beam according to the reliable index value based on the standard normal distribution relation which is satisfied by the reliable index value and the failure probability;
accordingly, the determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point comprises the following steps:
and determining the fatigue life of the steel crane girder according to the measuring point with the minimum residual fatigue life and combining the failure probability.
5. The method for detecting the fatigue life of the steel crane girder according to claim 1, further comprising, after obtaining the stress spectrum of each measuring point:
constructing a model by finite element analysis on the steel crane beam, and calculating a stress value of a maximum stress position;
if the stress of the position with the largest stress is larger than the dynamic stress of all the measuring points, carrying out fatigue strength checking calculation on the position with the largest stress;
if the fatigue strength does not meet the design requirement, the subsequent processes of determining the reliable index value and determining the fatigue life are terminated, and the position with the largest stress is judged to need reinforcement treatment.
6. The method for detecting the fatigue life of the steel crane beam according to claim 5, wherein if the dynamic stress of any measuring point is larger than the stress of the maximum part, the defect or damage exists at the measuring point part or around the measuring point.
7. The method for detecting the fatigue life of the steel crane girder according to claim 5, wherein after the stress spectrum of each measuring point is obtained, the method further comprises:
constructing a model by finite element analysis on the steel crane beam, and calculating stress of each measuring point;
if the dynamic stress of the measuring point exceeding the preset number is inconsistent with the finite element calculation result, or if the dynamic stress of a certain measuring point part is different from the finite element calculation result by more than the preset condition, reconstructing a model, and calculating the stress of each measuring point through finite element analysis until the number of the inconsistent dynamic stress of the measuring point part and the finite element calculation result is less than the preset number, and the dynamic stress of any measuring point part is different from the finite element calculation result by less than the preset condition.
8. A steel crane beam fatigue life detection device, comprising:
the detection module is used for continuously collecting the measuring point dynamic stress of a plurality of measuring points of the crane beam by carrying out dynamic strain test on the steel crane beam to obtain a stress spectrum of each measuring point;
the analysis module is used for determining a reliable index value according to the range condition of the steel crane beam detectable component;
the processing module is used for determining the residual fatigue life of each measuring point according to the material performance parameter, the reliability index value, the equivalent positive stress amplitude and the total number of stress cycles counted in the stress spectrum within a preset range;
and the evaluation module is used for determining the fatigue life of the steel crane girder according to the residual fatigue life of each measuring point.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for detecting fatigue life of a steel crane beam according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steel crane beam fatigue life detection method according to any one of claims 1 to 7.
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| CN202310755607.XA CN116858667A (en) | 2023-06-25 | 2023-06-25 | Method and device for detecting fatigue life of steel crane beam |
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