CN105160064A - Damage identification and estimation system for small concrete beam fatigue test - Google Patents
Damage identification and estimation system for small concrete beam fatigue test Download PDFInfo
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- CN105160064A CN105160064A CN201510453137.7A CN201510453137A CN105160064A CN 105160064 A CN105160064 A CN 105160064A CN 201510453137 A CN201510453137 A CN 201510453137A CN 105160064 A CN105160064 A CN 105160064A
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Abstract
The invention discloses a damage identification and estimation system for a small concrete beam fatigue test. Different concrete fatigue damage evolution equations are selected, embedded computation is realized through secondary development of software, indoor small beam fatigue test data is used to identify damage evolution equation parameters, and the identification precision is verified. The developed estimation system for the small beam fatigue numerical test consists of a condition input module, a query module and a result output module, breaks through a conventional mode for obtaining related data by a large amount of indoor tests, and greatly reduces indoor small beam fatigue test frequency. According to the damage identification and estimation system, smart query system development of a graphic user interface of small concrete beam fatigue life is realized and the consumption of manpower, material resources, financial resources, time and the like in concrete fatigue research can be remarkably reduced.
Description
Technical field
The present invention relates to non-destructive tests and the Prediction System of the torture test of a kind of concrete girder, belong to civil construction project detection technique field.
Background technology
The indoor Fatigue Test Research of concrete girder test specimen is widely adopted in engineering, but the deficiency such as the torture test of concrete girder has that the cycle is long, cost is high and condition is harsh, in addition, by the restriction of the conditions such as funds, testing equipment and technological means, carry out concrete fatigue test in the broader context and be still unpractical to study its fatigue behaviour.Just Given this, the present invention, based on fracture damage theory, simulates girder torture test by numerical software, by carrying out comparing the reliability of defining method with actual experimental result.Realize replacing true girder torture test with numerical simulation, significantly reduce the cycle of fatigue behaviour evaluation, cost and workload.Data under the different tests operating mode obtain simulation set up the intelligent inquiry system of gui interface by MATLAB exploitation, can directly for user provides corresponding inquiry service.
Summary of the invention
For the deficiencies in the prior art, the object of the invention is the non-destructive tests based on the torture test of a kind of concrete girder of MATLAB language development and Prediction System TraFD(TrabecularFatigueDamage), TraFD software system data storehouse derives from the simulation result of concrete girder test specimen when adopting different fatigue damage model, system, in the process of design, has taken into full account the portability of the integrality of function, the simplification of operation, the clarity at interface and system.
In order to solve the problem, the invention provides non-destructive tests and the Prediction System of the torture test of a kind of concrete girder, include load module, enquiry module and output module, described load module includes model form, model coefficient, ultimate load, reloading, initial modulus, the parameter query condition of primary stress and fracture toughness, described enquiry module includes database, Data Matching and interpolation and Query Result export, described output module comprises Query Result, described Query Result is respectively used to text output and preserves and display fatigue lifetime, by inputting different parameters as querying condition, retrieve with the data of data store internal, the data be retrieved carry out mating and interpolation subsequently, finally draw fatigue experiment result, fatigue experiment result is preserved two kinds of modes by display fatigue lifetime with text output and is shown.
Further improvement is: described model form adopts linear function model, power function model and exponential Function Model.
Further improvement is: in model coefficient, the fatigue lifetime corresponding to coefficient value is recommended under being provided with certain model and loading level in database, or coefficient is adjusted arbitrarily near recommendation, to determine and the coefficient value that corresponding experimental result conforms to, and to estimate the fatigue test results under unknown operating mode with this value.
Further improvement is: described ultimate load is obtained in true rupture failure test by girder test specimen, the fracture toughness recommendation of different test specimen can be drawn by ultimate load simultaneously, the average being tested obtained otherwise limit load by rupture failure is given in database, and in this, as ultimate load recommendation, user can modify to this according to the test findings of oneself.
Further improvement is: described reloading is the loaded value of asphalt girder torture test, stored out for 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 fatigue lifetime that different fatigue damage model obtains under totally nine kinds of stress ratio loading levels in database, when the load of user's input is existing load in database, corresponding result directly will be recalled display by system, when the load of user's input is the load do not had in database, system by interpolation arithmetic, will draw the fatigue lifetime of test specimen.
Further improvement is: described initial modulus is the modulus of girder test specimen when being without damage, and directly has influence on constitutive relation and the fatigue lifetime of material, and in system, default value is 2000MPa, and user can change according to concrete test figure.
Further improvement is: described primary stress refers to the maximum tension stress produced at the bottom of girder test specimen layer under reloading acts on for the first time, when initial modulus and repeated stress are determined, initial stress values will provide automatically, when with inconsistent needed for user, can manually change.
Further improvement is: enquiry module is realized by the call back function of the internal system of correspondence, exported by data base call, Data Matching and interpolation and Query Result and carry out work successively, when inquiring about beginning, the partial query condition that Prediction System is inputted by user is carried out coupling to internal database and is called, and is temporarily stored in internal system program as variable; System is retrieved the data called in database according to other querying condition subsequently, mate again, if the match is successful, then result is directly exported, if without complete matched data, then by three-dimensional interpolation to the rational interpolation of row during data with existing and extension, the data obtained are exported as a result.
Further improvement is: the data that output module transmits out by accepting enquiry module, with the form of editable text display with system interface in, and can plain text form preserve and assigned address.
Further improvement is: database is the foundation of Prediction System, in Prediction System, the data input and output of load module, enquiry module and output module carry out unified management by the database concentrated, contact between individual module is completed by database, and the major function of database is: all data of centralized management total system; Reliable data communication is carried out with each subsystem; Provide convenience, fast, comprehensive data query.
Further improvement is: the principal database of Prediction System all adopts EXCEL file to store, operated by the advanced file I/O in MATLAB, conveniently can realize the digital independent between MATLAB and EXCEL and write, estimate except the body data library storage of system, Prediction System also achieves the text output to the Query Result under different situations, is about to the condition of inquiry and the expected life of correspondence and is stored in the text that user specifies.
MATLABCompiler is the compilation tool that MATLAB carries, its M file transform can be become the source code file that C/C++ etc. is dissimilar, and generate necessary MEX file (.dll file) on this basis, the application program (.exe file) that can independently perform is generated again by visual c++ compiler, this mode directly can call built-in function wherein, generate and issue the executable file of disobeying bad MATLAB, thus greatly improving the execution efficiency of code.The application file that especially can independently perform, does not need the support of MATLAB environment, extends the range of application of program.
Conveniently the transplanting of system uses, and the All Files needed for TraFD Prediction System can being run is bundled in same compressed file.TraFD.exe, help document and dynamic link library installation file MCRInstaller.exe that the TraFD.exe generated with compiling by TraFD.fig file, the EXCEL file of memory system data and compiling generate pack and encapsulate.Two kinds of installation files have been done when system packing encapsulation, one is complete installation file, another kind is part installation file, only need run part installation file, then need to run complete installation file in other computer in the computer installed with version MATLAB.
The invention has the beneficial effects as follows: 1) be according to setting up TraFD system database with numerical simulation result, and using EXCEL as data storage medium, realize system calling database by the interface function between MATLAB and EXCEL.
2) by TraFD system development modularization, the query function to concrete girder fatigue lifetime is realized with mutual coordination the between condition entry module, enquiry module and result output module.
3) system program is compiled with C++ compiler, with the associated documents uniform packing such as system database, be encapsulated as the executable program that can run independent of MATLAB environment.
4) carry out accuracy checking based on a small amount of test figure identifiable design concrete girder Fatigue Regularity, Prediction System significantly can reduce human and material resources, financial resources and time etc. and expend.
Accompanying drawing explanation
Fig. 1 is Prediction System functional structure chart of the present invention.
Embodiment
In order to deepen the understanding of the present invention, be further described the present invention below in conjunction with embodiment, the present embodiment only for explaining the present invention, does not form limiting the scope of the present invention.
Include load module, enquiry module and output module, described load module includes model form, model coefficient, ultimate load, reloading, initial modulus, the parameter query condition of primary stress and fracture toughness, described enquiry module includes database, Data Matching and interpolation and Query Result export, described output module comprises Query Result, described Query Result is respectively used to text output and preserves and display fatigue lifetime, by inputting different parameters as querying condition, retrieve with the data of data store internal, the data be retrieved carry out mating and interpolation subsequently, finally draw fatigue experiment result, fatigue experiment result is preserved two kinds of modes by display fatigue lifetime with text output and is shown.
Described model form adopts linear function model, power function model and exponential Function Model.
Described in model coefficient, meaning representated by coefficient in different fatigue damage model is different, in same model, the size of the horizontal drag coefficient value of different loading is also different, model coefficient select the whether accurate accuracy directly having influence on model Fatigue Life Prediction, with the error due to test in database, the fatigue lifetime obtained under identical test material and operating condition of test is also not necessarily identical, in order to increase the practicality of system, the fatigue lifetime corresponding to coefficient value is recommended under being not only provided with certain model and loading level in database, also can adjust arbitrarily near recommendation coefficient, to determine and the coefficient value that corresponding experimental result conforms to, and estimate the fatigue test results under unknown operating mode with this value.
Described ultimate load is obtained in true rupture failure test by girder test specimen, it is the basis determining material loading level, the fracture toughness recommendation of different test specimen can be drawn by ultimate load simultaneously, the average being tested obtained otherwise limit load by rupture failure is given in database, and in this, as ultimate load recommendation.
Described reloading is the loaded value of asphalt girder torture test, its size directly affects the number of times of fatigue lifetime, stored out for 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9 fatigue lifetime that different fatigue damage model obtains under totally nine kinds of stress ratio loading levels in database, when the load of user's input is existing load in database, corresponding result directly will be recalled display by system, when the load of user's input is the load do not had in database, system by interpolation arithmetic, will draw the fatigue lifetime of test specimen.
Described initial modulus is the modulus of girder test specimen when being without damage, and directly has influence on constitutive relation and the fatigue lifetime of material, and in system, default value is 2000MPa.
Described primary stress refers to the maximum tension stress produced at the bottom of girder test specimen layer under reloading acts on for the first time, and it is by the coefficient with decision Fatigue Damage Model.Because the girder sample dimensions selected is certain, in online elastic system, when the elastic modulus of material is certain value, initial maximum tension at the bottom of girder layer and payload values linear, therefore, when initial modulus and repeated stress are determined, initial stress values will provide automatically.
The present embodiment, for bituminous concrete, sets forth non-destructive tests and the Prediction System of a kind of concrete girder torture test.Problem describes: the ultimate load being of a size of the AC-16 I type bituminous concrete girder test specimen of 0.25m × 0.05m × 0.05m is 2834N, fracture toughness is 0.28MPam0.5, girder the maximal bend stress at the bottom during Ultimate Loads is 2.89MPa, and the initial modulus of elastic properties of materials is 2000MPa.Fatigue Damage Model adopts power function model: D=(
b-1) N model coefficient value: b=50961e-006.
Start Prediction System and carry out initial configuration to system, the known parameters described by problem being input to the relevant position of system, the stress ratio of input 0.4, Query Result fatigue lifetime obtaining various Fatigue Damage Model under 0.4 loading level is 9734.
Claims (7)
1. the non-destructive tests of concrete girder torture test and Prediction System, it is characterized in that: include load module, enquiry module and output module, described load module includes model form, model coefficient, ultimate load, reloading, initial modulus, the parameter query condition of primary stress and fracture toughness, described enquiry module includes database, Data Matching and interpolation and Query Result export, described output module comprises Query Result, described Query Result is respectively used to text output and preserves and display fatigue lifetime, by inputting different parameters as querying condition, retrieve with the data of data store internal, the data be retrieved carry out mating and interpolation subsequently, finally draw fatigue experiment result, fatigue experiment result is preserved two kinds of modes by display fatigue lifetime with text output and is shown.
2. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, is characterized in that: described model form adopts linear function model, power function model and exponential Function Model.
3. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, it is characterized in that: in model coefficient, the fatigue lifetime corresponding to coefficient value is recommended under being provided with certain model and loading level in database, or coefficient is adjusted arbitrarily near recommendation, to determine and the coefficient value that corresponding experimental result conforms to, and to estimate the fatigue test results under unknown operating mode with this value.
4. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, it is characterized in that: described ultimate load is obtained in true rupture failure test by girder test specimen, the fracture toughness recommendation of different test specimen can be drawn by ultimate load simultaneously, the average being tested obtained otherwise limit load by rupture failure is given in database, and in this, as ultimate load recommendation, user can modify to this according to the test findings of oneself.
5. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, it is characterized in that: described reloading is the loaded value of asphalt girder torture test, 0.1 has been stored out in database, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 fatigue lifetime that different fatigue damage model obtains under totally nine kinds of stress ratio loading levels, when the load of user's input is existing load in database, corresponding result directly will be recalled display by system, when the load of user's input is the load do not had in database, system will pass through interpolation arithmetic, draw the fatigue lifetime of test specimen.
6. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, it is characterized in that: described initial modulus is the modulus of girder test specimen when being without damage, directly have influence on constitutive relation and the fatigue lifetime of material, in system, default value is 2000MPa, and user can change according to concrete test figure.
7. the non-destructive tests of a kind of concrete girder as claimed in claim 1 torture test and Prediction System, it is characterized in that: described primary stress refers to the maximum tension stress produced at the bottom of girder test specimen layer under reloading acts on for the first time, when initial modulus and repeated stress are determined, initial stress values will provide automatically, when with inconsistent needed for user, can manually change.
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| US7499841B2 (en) * | 2004-07-08 | 2009-03-03 | Sandia Corporation | Application for managing model-based material properties for simulation-based engineering |
| CN101382957A (en) * | 2008-10-24 | 2009-03-11 | 用友软件股份有限公司 | System for establishing enquiry model and establishing method |
| CN101509855A (en) * | 2009-03-17 | 2009-08-19 | 华东理工大学 | On-line prediction method for high-temperature pipe damage and longevity |
| CN104182586A (en) * | 2014-08-25 | 2014-12-03 | 西南科技大学 | Assessment system and method of blasting damage in reinforced concrete building structure |
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Patent Citations (7)
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| US6799463B2 (en) * | 2001-11-02 | 2004-10-05 | The Boeing Company | Method and system for automated fatigue and structural analysis of an element |
| US7499841B2 (en) * | 2004-07-08 | 2009-03-03 | Sandia Corporation | Application for managing model-based material properties for simulation-based engineering |
| CN1821742A (en) * | 2006-03-23 | 2006-08-23 | 上海理工大学 | Method for determining structure steel low load reinforcing property |
| CN101122595A (en) * | 2007-09-04 | 2008-02-13 | 中交四航工程研究院有限公司 | Concrete structure residual life analysis system |
| CN101382957A (en) * | 2008-10-24 | 2009-03-11 | 用友软件股份有限公司 | System for establishing enquiry model and establishing method |
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Application publication date: 20151216 |