CN117852263A - Real-time analysis method for steel structure fatigue - Google Patents
Real-time analysis method for steel structure fatigue Download PDFInfo
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- CN117852263A CN117852263A CN202311774525.6A CN202311774525A CN117852263A CN 117852263 A CN117852263 A CN 117852263A CN 202311774525 A CN202311774525 A CN 202311774525A CN 117852263 A CN117852263 A CN 117852263A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010223 real-time analysis Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 238000007619 statistical method Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract 2
- 238000004458 analytical method Methods 0.000 claims description 13
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 8
- 238000011156 evaluation Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/08—Probabilistic or stochastic CAD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/04—Ageing analysis or optimisation against ageing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Geometry (AREA)
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- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention provides a real-time analysis method for steel structure fatigue, which is characterized in that a target spot is arranged at a position required by a steel structure, and the spatial displacement data of the target spot is acquired in a machine vision mode; decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation; simplifying the steel structure into a beam unit, and calculating to obtain real-time stress values of different node positions on the beam unit; finally, carrying out statistical analysis of fatigue parameters by using the stress value obtained by calculation, and carrying out fatigue life assessment by referring to related specifications. The method is simple to implement, can effectively provide a large amount of stress data required by fatigue evaluation of the steel structure, does not need to install a large amount of strain sensors on the steel structure, effectively reduces the cost, and can be applied to construction sites.
Description
Technical Field
The invention relates to a real-time analysis method for steel structure fatigue, and belongs to the field of steel structure construction.
Background
Fatigue is a major cause of stiffness damage in large span steel structures. The fatigue analysis of the steel structure at present is performed by monitoring the real-time strain of the steel structure, and the fatigue state and the residual life of the steel structure are obtained based on the statistical information of the stress amplitude of the steel structure, so that a large number of strain sensors are required to be installed on the steel structure, and the strain sensors are required to maintain sufficient precision and reliability in long-term use, which are often difficult to achieve in a real scene, and therefore, the fatigue analysis of the steel structure is still mainly concentrated in laboratory researches at present, and the direct research and the application in the field are less.
Aiming at a steel structure in the engineering construction process, the fatigue problem is not likely to exist due to the new structure. But its initial value of fatigue life should be monitored from the beginning of the system transition phase during construction. Meanwhile, some steel structures for temporary support also have the problem of fatigue damage of steel structures with different sizes. Therefore, the invention provides a steel structure fatigue monitoring technology and method based on micro-deformation monitoring, aiming at solving the technical problem of fatigue analysis of a steel structure on a construction site.
Disclosure of Invention
The invention aims to provide a real-time analysis method for steel structure fatigue, which is simple to implement, can effectively provide a large amount of stress data required by steel structure fatigue evaluation, does not need to install a large amount of strain sensors on a steel structure, effectively reduces the cost and can be applied to a construction site.
In order to solve the technical problems, the invention provides the following technical scheme:
a real-time analysis method for steel structure fatigue, comprising the steps of:
step 1, installing a target point at a position required by a steel structure, and acquiring spatial displacement data of the target point in a machine vision mode;
step 2, decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation;
step 3, simplifying the steel structure into a beam unit, carrying out dynamic stress analysis on the beam under specific deformation in a mode of solidification at two ends, and calculating to obtain real-time stress values of different node positions on the beam unit;
and 4, carrying out statistical analysis of fatigue parameters according to the calculated stress value, and carrying out fatigue life assessment.
Preferably, in the method for analyzing fatigue of a steel structure in real time, when spatial displacement data of a target point is collected by adopting a machine vision mode, the sampling frequency is not less than 20Hz with a single target point.
Preferably, in the above-mentioned real-time analysis method for steel structural fatigue, when the acquired spatial displacement data is decomposed in a spatial global cartesian coordinate system, the Z direction in the global cartesian coordinate system should be consistent with the gravitational acceleration direction.
Preferably, in the above real-time analysis method for steel structural fatigue, the statistical analysis includes full stress amplitude, half stress amplitude, and statistical probability and frequency of each occurrence.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
according to the real-time analysis method for the fatigue of the steel structure, the target spot is installed at the position required by the steel structure, and the spatial displacement data of the target spot is acquired in a machine vision mode; decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation; the steel structure is simplified to be a beam unit, and dynamic stress analysis of the beam under specific deformation is carried out in a mode of two-end consolidation, and as the deformation of the beam unit is continuous, real-time stress values of different node positions on the beam unit can be calculated; and finally, carrying out statistical analysis of fatigue parameters by using the calculated stress value, wherein the statistical analysis comprises total stress amplitude, half stress amplitude, respective occurrence statistical probability and number of times, and carrying out fatigue life assessment by referring to related specifications. By adopting the method, dynamic monitoring is mainly carried out on the steel structural member with obvious system conversion or passive load, the monitoring difficulty is reduced, meanwhile, a finite element analysis method is introduced, the number of stress measurable points is also increased, and more data sources can be formed in the aspect of fatigue evaluation. The method is simple to implement, can effectively provide a large amount of stress data required by fatigue evaluation of the steel structure, does not need to install a large amount of strain sensors on the steel structure, effectively reduces the cost, and can be applied to construction sites.
Drawings
FIG. 1 is a flow chart of a method for real-time analysis of steel structure fatigue according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. The technical contents and features of the present invention will be described in detail below with reference to the attached drawings by way of the illustrated embodiments. It should be further noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. For convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this should not be construed as a limitation of the technical scheme of the present invention.
Referring to fig. 1, the embodiment discloses a real-time analysis method for steel structure fatigue, which comprises the following steps:
step 1, installing a target point at a position required by a steel structure, and acquiring spatial displacement data of the target point in a machine vision mode;
step 2, decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation;
step 3, simplifying the steel structure into a beam unit, carrying out dynamic stress analysis on the beam under specific deformation in a mode of solidification at two ends, and calculating to obtain real-time stress values of different node positions on the beam unit; because the deformation of the beam unit is continuous, the real-time stress values of different node positions on the beam unit can be calculated;
and 4, carrying out statistical analysis of fatigue parameters according to the calculated stress value, and carrying out fatigue life assessment. The fatigue life assessment is performed with reference to industry fatigue life related specifications.
According to the real-time analysis method for the fatigue of the steel structure, the target spot is installed at the position required by the steel structure, and the spatial displacement data of the target spot is acquired in a machine vision mode; decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation; the steel structure is simplified to be a beam unit, and dynamic stress analysis of the beam under specific deformation is carried out in a mode of two-end consolidation, and as the deformation of the beam unit is continuous, real-time stress values of different node positions on the beam unit can be calculated; and finally, carrying out statistical analysis of fatigue parameters by using the calculated stress value, wherein the statistical analysis comprises total stress amplitude, half stress amplitude, respective occurrence statistical probability and number of times, and carrying out fatigue life assessment by referring to related specifications. By adopting the method, dynamic monitoring is mainly carried out on the steel structural member with obvious system conversion or passive load, the monitoring difficulty is reduced, meanwhile, a finite element analysis method is introduced, the number of stress measurable points is also increased, and more data sources can be formed in the aspect of fatigue evaluation. The method is simple to implement, can effectively provide a large amount of stress data required by fatigue evaluation of the steel structure, does not need to install a large amount of strain sensors on the steel structure, effectively reduces the cost, and can be applied to construction sites.
Preferably, in the method for analyzing fatigue of a steel structure in real time, when spatial displacement data of a target point is collected by adopting a machine vision mode, the sampling frequency is not less than 20Hz with a single target point. The machine vision mode can provide enough deformation data acquisition precision and frequency, and can be used for fatigue analysis under dynamic deformation.
Preferably, in the above-mentioned real-time analysis method for steel structural fatigue, when the acquired spatial displacement data is decomposed in a spatial global cartesian coordinate system, the Z direction in the global cartesian coordinate system should be consistent with the gravitational acceleration direction. The spatial global Cartesian coordinate system can keep the direction consistency and the numerical time variation of the deformation in each orthogonal direction after the spatial deformation decomposition in the time domain; if the directions are not consistent, the contrast analysis in the time domain cannot be performed. Because the finite element model adopts a standard coordinate system, the Z direction is consistent with the gravity acceleration, so that the Z direction is consistent with the gravity acceleration direction, and the measured data can be associated and analyzed with the finite element model.
Preferably, in the above real-time analysis method for steel structural fatigue, the statistical analysis includes full stress amplitude, half stress amplitude, and statistical probability and frequency of each occurrence.
In summary, the invention is mainly used for dynamically monitoring the steel structural member with obvious system conversion or passive load, reduces the monitoring difficulty, introduces a finite element analysis method, improves the number of stress measurable points, and can form more data sources in the aspect of fatigue evaluation.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (4)
1. The real-time analysis method for the steel structure fatigue is characterized by comprising the following steps of:
step 1, installing a target point at a position required by a steel structure, and acquiring spatial displacement data of the target point in a machine vision mode;
step 2, decomposing the acquired spatial displacement data under a spatial global Cartesian coordinate system; selecting the deformation in the direction of the orthogonal axis with the largest deformation as main fatigue deformation, and analyzing the fatigue life of the steel structure only aiming at the main fatigue deformation;
step 3, simplifying the steel structure into a beam unit, carrying out dynamic stress analysis on the beam under specific deformation in a mode of solidification at two ends, and calculating to obtain real-time stress values of different node positions on the beam unit;
and 4, carrying out statistical analysis of fatigue parameters by using the stress value obtained by calculation, and carrying out fatigue life assessment.
2. The method for real-time analysis of steel structure fatigue according to claim 1, wherein the sampling frequency is not less than 20Hz for a single target point when the spatial displacement data of the target point is acquired by machine vision.
3. The method for real-time analysis of steel structure fatigue according to claim 1, wherein when the acquired spatial displacement data is decomposed in a spatial global cartesian coordinate system, the Z direction in the global cartesian coordinate system should coincide with the gravitational acceleration direction.
4. A method for real time analysis of steel structure fatigue according to claim 3, wherein the statistical analysis includes full stress amplitude, half stress amplitude and statistical probability, number of respective occurrences.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311774525.6A CN117852263A (en) | 2023-12-21 | 2023-12-21 | Real-time analysis method for steel structure fatigue |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311774525.6A CN117852263A (en) | 2023-12-21 | 2023-12-21 | Real-time analysis method for steel structure fatigue |
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| CN202311774525.6A Pending CN117852263A (en) | 2023-12-21 | 2023-12-21 | Real-time analysis method for steel structure fatigue |
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- 2023-12-21 CN CN202311774525.6A patent/CN117852263A/en active Pending
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