Papers by Geovanne Viana Nogueira
Revista IBRACON de Estruturas e Materiais, Oct 2, 2014
The analysis of reinforced concrete structures until failure requires the consideration of geomet... more The analysis of reinforced concrete structures until failure requires the consideration of geometric and material nonlinearities. However, nonlinear analysis is much more complex and costly than linear analysis. In order to obtain a computationally efficient approach to nonlinear analysis of reinforced concrete structures, this work presents the formulation of a nonlinear plane frame element. Geometric nonlinearity is considered using the co-rotational approach and material nonlinearity is included using appropriate constitutive relations for concrete and steel. The integration of stress resultants and tangent constitutive matrix is carried out by the automatic subdivision of the cross-section and the application of the Gauss quadrature in each subdivision. The formulation and computational implementation are validated using experimental results available in the literature. Excellent results were obtained.
In this work we present a generalization of a finite element formulation, based on the new Uncons... more In this work we present a generalization of a finite element formulation, based on the new Unconstrained Vector Layerwise Theory (UVLWT), that allows a geometrically exact description of 2D laminated plane frames with accurate stress distribution. The formulation presents a natural and easy extension for 3D applications. The proposed generalization is based on a penalty strategy to couple frames at corners in a very accurate and elegant way. It consists on the introduction of rigid, semi-rigid and hinged connections among elements, for which all degrees of freedom of each lamina are considered and their energetically conjugate forces calculated. Flexible supports of the structure regarding the static reference have also been successfully developed and implemented. Although two-dimensional frames are the main object of this study, three-dimensional connection expressions are developed in order to promote future developments and insights. In order to have complete solutions, even when...
Composite Structures, 2016
Proceedings of the XXXVI Iberian Latin American Congress on Computational Methods in Engineering, 2015
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Papers by Geovanne Viana Nogueira