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|Type:||Artigo de evento|
|Title:||Obtaining The Constitutive Tensile Relation Of Concrete Through Inverse Analysis|
|Author:||De Oliveira e Sousa J.L.A.|
|Abstract:||This paper deals with the determination of a stress-crack opening (σ-w) curve for the characterization of the fracture behavior of plain and fiber reinforced concretes. The objective is to provide a constitutive model for the application of cohesive crack models in the analysis of structural members. Several researchers have proposed the use of beam tests to obtain the σ-w relation indirectly using inverse analysis. In the strategy described here, an error function is defined as the integral of the squared differences between a numericallyor analytically-obtained load-crack opening (P-CMOD) curve and the corresponding curve resulting from three-point bend tests of notched prismatic specimens. Optimization techniques are employed to find the set of σ-w parameters that leads to the minimum error. The strategy has been implemented in an object-oriented code, which is capable of handling any σ-w curve description. The current implementation uses a third party analytical code for computing the P-CMOD curve corresponding to a trial σ-w set of parameters. Implementation of new σ-w models or different schemes for computation of P-CMOD curves, e.g., using the finite element method, is straightforward. Example applications are presented.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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