The Experts below are selected from a list of 4665 Experts worldwide ranked by ideXlab platform
Marco Morandini - One of the best experts on this subject based on the ideXlab platform.
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A two-level nonlinear beam analysis method
International Journal of Solids and Structures, 2020Co-Authors: Marco MorandiniAbstract:Abstract The nonlinear response of straight, constant cross section beams is investigated by means of a two-level finite element solution procedure. The higher level model is built starting from the Hellinger-Reissner principle, with the normal stress Resultant and Moment Resultant as additional unknowns field beside the beam reference line position and orientation field. A lower-level nonlinear cross-section problem is defined for each integration point. The two-level models are linked together by the normal stress Resultant and Moment Resultant, in one direction, and by the variation of the complementary strain energy in the other: the cross-section level do deform in such a way that the the normal stress Resultant and Moment Resultant are equal to those of the beam model, while the higher level beam model receives the gradient and Hessian of the complementary strain energy with respect to the Resultants. The complementary strain energy gradient and Hessian are computed by defining suitable first and second order adjoint problems.
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Analysis of beam cross section response accounting for large strains and plasticity
International Journal of Solids and Structures, 2019Co-Authors: Marco MorandiniAbstract:Abstract The nonlinear response of straight, constant cross section of beams is investigated by means of a semi-analytical approach. The three dimensional displacement field is approximated, for a given cross section, using a FE element discretization on the section combined with a Taylor expansion in the beam axial direction. This allows to compute the beam cross section deformation as a function of the stress Resultant and Moment Resultant, without the need to solve a three dimensional model, still allowing to account for complex three-dimensional constitutive laws.
Tinawirené - One of the best experts on this subject based on the ideXlab platform.
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Post-processing of finite element stress fields using dual kriging based methods for structural analysis of concrete dams
Finite Elements in Analysis and Design, 2006Co-Authors: Mcleanpatrice, Légerpierre, TinawirenéAbstract:A post-processing scheme for force and Moment Resultant determination in finite element (FE) analysis of concrete dams is proposed. Generally, stress integration is performed with algorithms based ...
René Tinawi - One of the best experts on this subject based on the ideXlab platform.
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Post-processing of finite element stress fields using dual kriging based methods for structural analysis of concrete dams
Finite Elements in Analysis and Design, 2006Co-Authors: Patrice Mclean, Pierre Léger, René TinawiAbstract:A post-processing scheme for force and Moment Resultant determination in finite element (FE) analysis of concrete dams is proposed. Generally, stress integration is performed with algorithms based on the use of FE shape functions. The global problem of determining the Resultant forces and Moments, on a planar surface, results from the local treatment of each element cut by the surface. Difficulties arise when the surface is arbitrarily oriented and when the elements include curved edges. A global approach involving the dual kriging interpolation method is proposed to handle these complications. This interpolation technique is used (i) to define parametric curves and surfaces, and (ii) to estimate stress tensor field values within the model. The interpolated stresses are subsequently integrated to yield the Resultant forces and Moments. Computation of Resultant forces and Moments on arbitrarily oriented planar surfaces is performed in 2D and 3D structural models to assess the performance of the proposed approach.
Mcleanpatrice - One of the best experts on this subject based on the ideXlab platform.
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Post-processing of finite element stress fields using dual kriging based methods for structural analysis of concrete dams
Finite Elements in Analysis and Design, 2006Co-Authors: Mcleanpatrice, Légerpierre, TinawirenéAbstract:A post-processing scheme for force and Moment Resultant determination in finite element (FE) analysis of concrete dams is proposed. Generally, stress integration is performed with algorithms based ...
Patrice Mclean - One of the best experts on this subject based on the ideXlab platform.
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Post-processing of finite element stress fields using dual kriging based methods for structural analysis of concrete dams
Finite Elements in Analysis and Design, 2006Co-Authors: Patrice Mclean, Pierre Léger, René TinawiAbstract:A post-processing scheme for force and Moment Resultant determination in finite element (FE) analysis of concrete dams is proposed. Generally, stress integration is performed with algorithms based on the use of FE shape functions. The global problem of determining the Resultant forces and Moments, on a planar surface, results from the local treatment of each element cut by the surface. Difficulties arise when the surface is arbitrarily oriented and when the elements include curved edges. A global approach involving the dual kriging interpolation method is proposed to handle these complications. This interpolation technique is used (i) to define parametric curves and surfaces, and (ii) to estimate stress tensor field values within the model. The interpolated stresses are subsequently integrated to yield the Resultant forces and Moments. Computation of Resultant forces and Moments on arbitrarily oriented planar surfaces is performed in 2D and 3D structural models to assess the performance of the proposed approach.