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S13 Integridade Estrutural |
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Title:
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STRUCTURAL DAMAGE ASSESSMENT USING THE ZOOMING METHOD
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Summary :
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THE PRESENT STUDY DESCRIBES A FORMULATION FOR STRUCTURAL DAMAGE ASSESSMENT BASED ON METHODS OF SYSTEM IDENTIFICATION, WHICH RESULTS IN AN UNCONSTRAINED OPTIMIZATION PROBLEM. RESPONSE OF A DAMAGED STRUCTURE IS DIFFERENT FROM THE ORIGINAL UNDAMAGED ONE. A REFINED ANALYTICAL MODEL THAT PREDICTS THE RESPONSE OF THE STRUCTURE SUBJECT TO STATIC OR DYNAMIC LOADS IS AVAILABLE. USING THE OUTPUT ERROR APPROACH OF SYSTEM IDENTIFICATION IT IS POSSIBLE TO DETERMINE THE NECESSARY CHANGES IN THE ANALYTICAL MODEL SO THAT THE DIFFERENCE BETWEEN THE EXPERI-MENTAL RESULTS AND THE RESPONSE PREDICTED BY THE ANALYTICAL MODEL IS MINIMIZED. AS THE DESIGN SPACE OF THE RESULTING OPTIMIZATION PROBLEM IS HIGHLY NONCONVEX AND CAN POSSESS SEVERAL LOCAL MINIMA A DETERMINISTIC METHOD OF GLOBAL OPTIMIZATION DENOMINATED ZOOMING IS USED. THIS METHOD IS A GOOD ALTERNATIVE TO THE STOCHASTIC METHODS OF OPTIMIZATION DUE TO ITS SIMPLICITY. EXISTING SOFTWARE FOR LOCAL OPTIMIZATION CAN BE USED WITH ONLY A MINOR MODIFICATION. THE METHOD WAS APPLIED TO SIMPLE STRUCTURAL SYSTEMS AND THE RESULTS COMPARED TO THE ONES OB-TAINED WITH A LOCAL OPTIMIZATION METHOD AND A STOCHASTIC GLOBAL OPTIMIZATION METHOD. |
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Author :
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Bueno, Vanderlei C.
Soeiro, Francisco J.
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Paper View :
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