Integrated Graphical System to Physically Nonlinear Analysis based on the Generalized Finite Element Method
Leandro Lopes da Silva1; Roque Luiz da Silva Pitangueira1; Samuel Silva Penna1; Felício Bruzzi Barros1; Gabriel Neves Alves Ferreira1
1 Universidade Federal de Minas Gerais
doi:10.20906/CPS/COB-2015-1454
Resumo
This paper refers to the expansion of INSANE (INteractive Structural ANalysis Environment), an open source project developed by the Structural Engineering Department of Federal University of Minas Gerais. It presents the implementation details of an interactive graphical application that integrates pre-processor, constitutive models, nonlinear equation solvers and post-processor, in such a way that provides all the tools to perform two-dimensional physically nonlinear analysis using Generalized Finite Element Method (GFEM). To overcome the limitations of the data input format of the INSANE, that is based on XML (eXtensible Markup Language) text files, a pre-processor was developed. Such a pre-processor has three modules: Geometry, Mesh and Attributes where the user, respectively, creates a planar subdivision representing the model's geometry; generates a mesh using boundary mapping or domain decomposition; and defines the model attributes, such as nodal restraints, loadings, constitutive model, as well as nodal enrichment parameters for GFEM. Constitutive models based on elastic degradation are employed, allowing adopting fixed or rotating smeared crack models, or the isotropic damage models proposed by Mazars, de Vree, Lemaitre and Chaboche, Mazars and Lemaitre, Simo and Ju or Ju. After the definition of the GFEM's model, the user may choose one of the nonlinear equation solvers available and inform the related parameters. Load control method, displacement control method, generalized displacement control method and arch length control method are available. Once the analysis has been finished, the results can be depicted using the post-processor module tools.
Palavras-chave: Interactive Graphical Software; Physically nonlinear Analysis; Generalized Finite Element Method; Smeared Crack Models; Isotropic Damage Models