CN117910118A - Building structure safety evaluation method and system based on BIM model - Google Patents
Building structure safety evaluation method and system based on BIM model Download PDFInfo
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Abstract
The invention discloses a building structure safety evaluation method and system based on a BIM model, comprising the following steps: performing BIM model analysis on a deformation range building standard of a building steel structure to obtain deformation range crack depth parameters; monitoring the deformation range of the displacement of the building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data; monitoring the deformation range of the foundation of the building to obtain foundation deformation range data; performing deformation range evaluation on the building steel structure forming deformation range according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters; and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter. The invention realizes more accurate and reliable deformation range evaluation and ensures the safety of the building.
Description
Technical Field
The invention relates to the field of building safety, in particular to a building structure safety evaluation method and system based on a BIM model.
Background
The BIM technology is taken as a breakthrough means of the data management in the construction industry, can realize the integration, coordination and sharing of the whole life cycle data of the construction engineering, and has the application characteristics of three-dimensional visualization, multiparty coordination, project optimality, diagrammability and the like. With technology iteration, BIM technology shows more powerful attribute characteristics such as openness, simulation, interactivity and the like, which is more beneficial to expanding application of BIM in other industries.
However, in the design and construction process of some current large buildings, the problems that the deformation of the steel structure inside the building is safe and has defects and the like often occur after the building is completed, and the time and the effort are consumed by the subsequent modification and upgrading of the building, so that a method for monitoring and correcting the building structure in the early stage of the building design by using a modernization means is needed at present so as to improve the reasonable specification degree of the building structure and reduce engineering errors and defects.
Disclosure of Invention
The invention provides a building structure safety evaluation method and system based on a BIM model, which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a building structure security assessment method based on a BIM model, the method comprising:
performing BIM model analysis on a deformation range building standard of a building steel structure to obtain deformation range crack depth parameters;
monitoring the deformation range of the displacement of the building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
monitoring the deformation range of the foundation of the building to obtain foundation deformation range data;
performing deformation range evaluation on the building steel structure forming deformation range according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters;
and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
Further, the BIM model analysis is performed on the deformation range building standard of the building steel structure to obtain deformation range crack depth parameters, including:
determining a building reference construction period, and determining a deformation range reference of a building steel structure according to the building reference construction period;
formulating a measurement deformation range index according to the deformation range standard of the building steel structure;
And arranging the index for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the crack depth parameter of the deformation range.
Further, formulating a measure deformation range index according to the deformation range reference of the building steel structure, including:
based on the building reference construction period, acquiring relevant parameters of a building steel structure;
desensitizing and integrating the related parameters to obtain reference construction period parameters;
performing data analysis on the reference construction period parameters to obtain data analysis parameters;
and formulating the index for measuring the deformation range according to the data analysis parameters.
Further, the deformation range monitoring is performed on the displacement of the building to obtain a displacement deformation range monitoring parameter, which comprises:
Collecting parameter data of a steel structure forming die to obtain die standard data;
acquiring parameters of the steel structure to obtain steel structure parameter data;
obtaining steel structure strength data according to the mold standard data and the steel structure parameter data;
Flaw detection monitoring is carried out on the steel structure forming part, and the building inclination data are obtained;
and obtaining the displacement deformation range monitoring parameters according to the steel structure strength data and the building inclination data.
Further, the deformation range monitoring is performed on the foundation of the building to obtain foundation deformation range data, including:
Measuring the foundation settlement of the building to obtain the foundation bearing capacity, foundation rigidity parameters and specific foundation flaws of the building;
And obtaining the foundation deformation range data according to the bearing capacity, the foundation rigidity parameter and the foundation flaw.
Further, the method further comprises: performing deformation range adjustment on the crack evaluation parameters, wherein the performing deformation range adjustment on the crack evaluation parameters comprises:
screening existing data of a related database based on the steel structure strength data, the building inclination data and the foundation deformation range data;
taking the steel structure strength data, the building inclination data and the foundation deformation range data as variables, and constructing a visual curve graph based on the existing data of the related database;
Obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range;
and carrying out error correction on the visual curve graph through the maximum allowable value of the deformation range crack depth safety, and obtaining the deformation range adjustment parameters.
Further, the method also comprises the step of carrying out data standardization processing on the existing data of the related database.
A building structure security assessment system based on a BIM model, the system comprising:
Deformation range benchmark analysis unit: the method comprises the steps of performing BIM model analysis on deformation range building references of a building steel structure to obtain deformation range crack depth parameters;
Displacement deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of displacement of a building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
foundation deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of a foundation of a building to obtain foundation deformation range data;
inclination deformation range evaluation unit: the deformation range evaluation module is used for evaluating the deformation range of the building steel structure forming according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters;
Crack deformation range evaluation unit: and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
Further, the deformation range reference analysis unit includes:
building benchmark construction period component: determining a building reference construction period, and determining a deformation range reference of a building steel structure according to the building reference construction period;
Deformation range index formulating component: formulating a measurement deformation range index according to the deformation range standard of the building steel structure;
Deformation range crack depth component: and arranging the index for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the crack depth parameter of the deformation range.
Further, the device further comprises a deformation range adjusting unit, wherein the deformation range adjusting unit comprises:
A data screening component: screening existing data of a related database based on the steel structure strength data, the building inclination data and the foundation deformation range data;
a visual graph generation component: taking the steel structure strength data, the building inclination data and the foundation deformation range data as variables, and constructing a visual curve graph based on the existing data of the related database;
Deformation range crack depth safety allows maximum assembly: obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range;
error correction adjustment component: and carrying out error correction on the visual curve graph through the maximum allowable value of the deformation range crack depth safety, and obtaining the deformation range adjustment parameter.
By the technical scheme of the invention, the following technical effects can be realized:
the invention provides a building structure safety evaluation method and system based on a BIM model, which comprehensively, objectively evaluates and adjusts the deformation range of a building steel structure according to the modeling of the BIM, realizes more accurate and reliable deformation range evaluation, ensures building safety and effectively prevents disasters.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic flow chart of a building structure safety evaluation method based on a BIM model;
FIG. 2 is a schematic diagram of the unit composition of a building structure safety evaluation system method based on BIM model according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1, the application provides a building structure safety evaluation method based on a BIM model, which comprises the following steps:
a1: performing BIM model analysis on a deformation range building standard of a building steel structure to obtain deformation range crack depth parameters;
Specifically, the deformation range requirement of the building steel structure is determined by analyzing and determining the building standard of the building steel structure, the deformation range crack depth parameter is determined according to the deformation range requirement of the building steel structure, the deformation range crack depth parameter reflects the relative defect degree of the building in terms of meeting the deformation range requirement, the system can be helped to know the relative defects of different buildings in terms of the deformation range more clearly, and the position of the different buildings in the whole deformation range is determined according to the importance of the standard and the index.
A2: monitoring the deformation range of the displacement of the building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
Specifically, steel structure strength data refers to forming parameters of a steel structure, including: in the forming process of the steel structure, as the factors such as material deformation, stress concentration in the processing process, tool abrasion and the like can cause some flaw problems on the displacement of the building, common fatigue cracks, uneven deformation and the like can cause serious influence on the deformation range strength of the building, so that the displacement flaw data of the building can more comprehensively reflect the displacement deformation range condition of the building, and the accuracy of monitoring the displacement deformation range of the building by the system is improved.
A3: monitoring the deformation range of the foundation of the building to obtain foundation deformation range data;
Specifically, the defect problem can be caused to the foundation of the building in the process of forming the steel structure of the building, the influence of the building steel structure forming on the foundation deformation range is fully considered, the comprehensiveness of the system for integrally monitoring the steel structure forming deformation range can be improved, and the final evaluation accuracy is improved.
A4: performing deformation range evaluation on the building steel structure forming deformation range according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters;
A5: and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
Specifically, the inclination evaluation parameters are obtained through the data sets of the steel structure strength data, the building inclination data and the foundation deformation range data, and the objective deformation range problem of the building steel structure is reflected according to the inclination evaluation parameters.
Through the technical scheme of the invention, more accurate and reliable deformation range evaluation is effectively realized on the deformation range of the building steel structure.
BIM model analysis is carried out on deformation range building references of a building steel structure to obtain deformation range crack depth parameters, and the BIM model analysis comprises the following steps: determining a building standard construction period, and determining a deformation range standard of a building steel structure according to the building standard construction period; formulating a measurement deformation range index according to a deformation range reference of the building steel structure; and arranging the indexes for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the depth parameters of the deformation range cracks.
Specifically, under different building benchmark construction periods, different requirements are set for deformation ranges of building steel structure forming, higher requirements are set for corrosion resistance of the building steel structure, the construction period of the building benchmark is determined, the deformation range requirements of the building steel structure forming can be defined, further, according to the emphasis of the benchmark, deformation range indexes can be comprehensively and accurately measured, the deformation ranges of the building steel structure are ordered according to the deformation range indexes, the deformation range crack depth parameters are obtained, and the importance and the priority of each index in the deformation range of the building steel structure can be defined through the parameters for ordering the deformation range indexes. Therefore, deformation range evaluation and adjustment work can be more accurately carried out, limited resources and efforts are concentrated on improving and controlling indexes with the greatest influence, and the whole deformation range of the building steel structure is improved.
Formulating a measure deformation range index according to a deformation range reference of a building steel structure, comprising: based on the construction standard construction period, acquiring relevant parameters of a building steel structure; desensitizing and integrating the related parameters to obtain reference construction period parameters; data analysis is carried out on the reference construction period parameters to obtain data analysis parameters; and formulating a measurement deformation range index according to the data analysis parameters.
Specifically, the index for measuring the deformation range is firstly formulated based on different construction time periods of the building reference, the process can effectively denoise the data set, so that the integrated related data can generate forward parameters for the data analysis parameters, the data analysis parameters are further converted into the index for measuring the deformation range, and the standardized judgment of the forming deformation range of the building steel structure based on different construction time period references is realized.
Performing deformation range monitoring on the displacement of the building to obtain displacement deformation range monitoring parameters, wherein the displacement deformation range monitoring parameters comprise: collecting parameter data of a steel structure forming die to obtain die standard data; carrying out parameter acquisition on the steel structure to obtain steel structure parameter data; obtaining steel structure strength data according to the mold standard data and the steel structure parameter data; flaw detection monitoring is carried out on the steel structure forming part to obtain building inclination data; and obtaining displacement deformation range monitoring parameters according to the steel structure strength data and the building inclination data.
Specifically, the displacement deformation range of a building is affected by a plurality of aspects, wherein a steel structure forming die can generate important influence on the steel structure forming process of the building, after parameter data are determined, on the premise of meeting standards, the steel structure forming can be affected by other factors, the steel structure is directly detected and the building displacement is imaged to obtain the parameter data after the steel structure forming, the building displacement is detected by detection technical means, so that building inclination data are obtained, and building displacement deformation range monitoring parameters are determined by die standard data, steel structure strength data and building inclination data.
Further, the deformation range monitoring is performed on the foundation of the building to obtain foundation deformation range data, including:
measuring the foundation settlement of the building to obtain the foundation bearing capacity, foundation rigidity parameters and specific foundation flaws of the building;
and obtaining foundation deformation range data according to the bearing capacity, the foundation rigidity parameter and the foundation flaw.
Specifically, foundation monitoring of a building may use a settlement gauge or similar device to measure settlement of the building foundation, and a series of flaws in the foundation may occur before the steel structure of the building is formed, or may occur due to extrusion of the exterior of the building during the forming process of the mold.
The method further comprises the steps of: performing deformation range adjustment on the crack evaluation parameters, wherein performing deformation range adjustment on the crack evaluation parameters comprises:
screening existing data of a related database based on steel structure strength data, building inclination data and foundation deformation range data;
Specifically, existing data of a database related to the strength of a steel structure, the inclination of a building and the deformation range of a foundation are collected, screening and integration are carried out, the data can be normalized, screened and integrated by using a data mining and analysis technology, and related deformation range data in the similar situation in the past can be obtained through screening with the existing data of the database.
Constructing a visual graph based on existing data of a related database by taking steel structure strength data, building inclination data and foundation deformation range data as variables;
Specifically, steel structure strength, building inclination and foundation deformation range data are used as the reference of a visual curve chart, a visual curve chart is established, the existing database can be visualized and compared and analyzed by constructing the visual curve chart, and modes, trends and abnormal points in the data are found, so that more accurate reference and guidance are provided for subsequent deformation range adjustment.
Obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range;
And determining a safety allowable maximum value as a standard of the deformation range crack depth according to the previous deformation range crack depth parameter. According to the practical situation, a proper safe allowable maximum value determination method can be selected, the safe allowable maximum value of the depth of the crack of the deformation range can be set, the defect of the deformation range can be defined, and an explicit target and reference are provided for subsequent deformation range adjustment.
And carrying out error correction on the visual curve graph through the maximum value allowed by the crack depth safety of the deformation range, and obtaining the deformation range adjusting parameters.
Specifically, error correction and classification are performed on the data in the visual graph according to the set maximum allowable value of the crack depth safety in the deformation range. Through error correction of the visual graph, the deformation range condition of each data point can be clearly known, the data points are classified, the formation condition of the steel structure of the building with problems can be intuitively identified, and a basis is provided for formulating corresponding improvement measures.
Further, the method also comprises the step of carrying out data standardization processing on the existing data of the related database.
Specifically, the data normalization processing of the existing data of the database can eliminate dimension influence, improve data comparability, improve data deformation range and simplify data analysis process. The data standardization is very important for data preprocessing, and a more accurate and reliable basis is provided for subsequent data analysis and decision-making.
As shown in fig. 2, based on the same inventive concept as the building structure safety evaluation method based on the BIM model in the foregoing embodiment, the present invention further provides a building structure safety evaluation system based on the BIM model, where the system includes:
Deformation range benchmark analysis unit: the method comprises the steps of performing BIM model analysis on deformation range building references of a building steel structure to obtain deformation range crack depth parameters;
Displacement deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of displacement of a building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
foundation deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of a foundation of a building to obtain foundation deformation range data;
inclination deformation range evaluation unit: the method comprises the steps of performing deformation range evaluation on a building steel structure forming deformation range according to steel structure strength data, building inclination data and foundation deformation range data to obtain inclination deformation range evaluation parameters;
crack deformation range evaluation unit: and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
The adjusting system in the invention can effectively realize a building structure safety evaluation method based on the BIM model, and has the technical effects as described in the embodiment, and the description is omitted here.
Further, the deformation range reference analysis unit includes:
building benchmark construction period component: determining a building standard construction period, and determining a deformation range standard of a building steel structure according to the building standard construction period;
Deformation range index formulating component: formulating a measurement deformation range index according to a deformation range reference of the building steel structure;
deformation range crack depth component: and arranging the indexes for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the depth parameters of the deformation range cracks.
Further, the device further comprises a deformation range adjusting unit, wherein the deformation range adjusting unit comprises:
a data screening component: screening existing data of a related database based on steel structure strength data, building inclination data and foundation deformation range data;
A visual graph generation component: constructing a visual graph based on existing data of a related database by taking steel structure strength data, building inclination data and foundation deformation range data as variables;
Deformation range crack depth safety allows maximum assembly: obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range;
Error correction adjustment component: and carrying out error correction on the visual curve graph through the maximum value allowed by the crack depth safety of the deformation range, and obtaining the deformation range adjusting parameters.
Similarly, the above adjustment schemes of the system may also respectively correspond to the adjustment effects corresponding to the methods in the first embodiment, which are not described herein again.
Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope of the application. Thus, the present application is intended to include such modifications and alterations insofar as they come within the scope of the application or the equivalents thereof.
Claims (9)
1. The building structure safety evaluation method based on the BIM model is characterized by comprising the following steps of:
performing BIM model analysis on a deformation range building standard of a building steel structure to obtain deformation range crack depth parameters;
monitoring the deformation range of the displacement of the building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
monitoring the deformation range of the foundation of the building to obtain foundation deformation range data;
performing deformation range evaluation on the building steel structure forming deformation range according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters;
and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
2. The building structure safety evaluation method based on the BIM model according to claim 1, wherein the BIM model analysis is performed on deformation range building references of the building steel structure to obtain deformation range crack depth parameters, and the method comprises the following steps: determining a building reference construction period, and determining a deformation range reference of a building steel structure according to the building reference construction period; formulating a measurement deformation range index according to the deformation range standard of the building steel structure; arranging the index for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the crack depth parameter of the deformation range;
Formulating a measurement deformation range index according to the deformation range standard of the building steel structure, comprising: based on the building reference construction period, acquiring relevant parameters of a building steel structure; desensitizing and integrating the related parameters to obtain reference construction period parameters; performing data analysis on the reference construction period parameters to obtain data analysis parameters; and formulating the index for measuring the deformation range according to the data analysis parameters.
3. The building structure safety evaluation method based on the BIM model according to claim 1, wherein the method further includes: performing deformation range adjustment on the crack evaluation parameters, wherein the performing deformation range adjustment on the crack evaluation parameters comprises:
Screening existing data of a related database based on the steel structure strength data, the building inclination data and the foundation deformation range data; taking the steel structure strength data, the building inclination data and the foundation deformation range data as variables, and constructing a visual curve graph based on the existing data of the related database; obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range; and carrying out error correction on the visual curve graph through the maximum allowable value of the deformation range crack depth safety, and obtaining the deformation range adjustment parameters.
4. The building structure safety evaluation method based on the BIM model according to claim 1, wherein the performing deformation range monitoring on the displacement of the building to obtain the displacement deformation range monitoring parameter includes:
Collecting parameter data of a steel structure forming die to obtain die standard data;
acquiring parameters of the steel structure to obtain steel structure parameter data;
obtaining steel structure strength data according to the mold standard data and the steel structure parameter data;
Flaw detection monitoring is carried out on the steel structure forming part, and the building inclination data are obtained;
and obtaining the displacement deformation range monitoring parameters according to the steel structure strength data and the building inclination data.
5. The building structure safety evaluation method based on the BIM model according to claim 1, wherein the deformation range monitoring is performed on the foundation of the building to obtain the foundation deformation range data, and the method comprises the following steps:
Measuring the foundation settlement of the building to obtain the foundation bearing capacity, foundation rigidity parameters and foundation flaws of the building;
And obtaining the foundation deformation range data according to the bearing capacity, the foundation rigidity parameter and the foundation flaw.
6. A building structure safety evaluation method based on a BIM model according to claim 3, further comprising performing data normalization processing on existing data of the relevant database.
7. A building structure safety evaluation system based on a BIM model, which adopts the building structure safety evaluation method based on the BIM model as claimed in claim 1, wherein the system comprises:
Deformation range benchmark analysis unit: the method comprises the steps of performing BIM model analysis on deformation range building references of a building steel structure to obtain deformation range crack depth parameters;
Displacement deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of displacement of a building to obtain displacement deformation range monitoring parameters, wherein the deformation range monitoring parameters comprise steel structure strength data and building inclination data;
foundation deformation range monitoring unit: the method comprises the steps of monitoring the deformation range of a foundation of a building to obtain foundation deformation range data;
inclination deformation range evaluation unit: the deformation range evaluation module is used for evaluating the deformation range of the building steel structure forming according to the steel structure strength data, the building inclination data and the foundation deformation range data to obtain inclination deformation range evaluation parameters;
Crack deformation range evaluation unit: and comparing the inclined deformation range evaluation parameter with the deformation range crack depth parameter to obtain a crack evaluation parameter.
8. The building structure safety evaluation system based on the BIM model according to claim 7, wherein the deformation range reference analysis unit includes:
building benchmark construction period component: determining a building reference construction period, and determining a deformation range reference of a building steel structure according to the building reference construction period;
Deformation range index formulating component: formulating a measurement deformation range index according to the deformation range standard of the building steel structure;
Deformation range crack depth component: and arranging the index for measuring the deformation range from high to low according to the deformation range standard of the building steel structure, and obtaining the crack depth parameter of the deformation range.
9. The building structure safety evaluation system based on the BIM model according to claim 7, further comprising a deformation range adjustment unit including:
A data screening component: screening existing data of a related database based on the steel structure strength data, the building inclination data and the foundation deformation range data;
a visual graph generation component: taking the steel structure strength data, the building inclination data and the foundation deformation range data as variables, and constructing a visual curve graph based on the existing data of the related database;
Deformation range crack depth safety allows maximum assembly: obtaining a maximum safe allowable value of the depth of the crack in the deformation range according to the depth parameter of the crack in the deformation range;
Error correction adjustment component: and carrying out error correction on the visual curve graph through the maximum allowable value of the deformation range crack depth safety, and obtaining the deformation range adjustment parameters.
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