A penalty approach to obtain lower bound buckling loads of imperfection-sensitive shells

• Autores: Godoy, Luis A.; Jaca, Rossana C.; Sosa, Eduardo M.; Flores, Fernando G.
• Año de publicación: 2015
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Finite elements; Reduced energy method; Perturbation methods; Estructuras; Ingeniería Civil; Ingeniería Estructural
• Institución: Universidad Nacional de Córdoba

Fil: Godoy, Luis A. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Godoy, Luis A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Estructuras; Argentina.
Fil: Jaca, Rossana C. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Ingeniería Civil; Argentina.
Fil: Sosa, Eduardo M. West Virginia University. Civil and Environmental Engineering Department; Estados Unidos.
Fil: Flores, Fernando G. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Flores, Fernando G. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Estructuras; Argentina.
The strategy of Reduced Stiffness (or Reduced Energy) Analysis, in which selected energy components are eliminated to account for mode interaction and imperfection-sensitivity in a simplified way, was developed by Croll and co-workers since the early 1980s. This physical interpretation allows the formulation as an eigenvalue problem, in which the eigenvalue (critical load) is a lower bound to experiments and to nonlinear incremental analysis. This paper considers the computational implementation of both reduced stiffness and reduced energy approaches to the buckling of shell structures by means of perturbation techniques and penalty parameter methods. The structural configurations of interest in this work are cylindrical shells with or without a roof. The reduced stiffness approach has been implemented in a special purpose finite element code for shells of revolution, whereas the reduced energy methodology was implemented in a general purpose finite element code. The present results are compared with geometrically nonlinear analysis including geometric imperfections. Achievements and difficulties in extending the methodologies to complex problems in engineering practice are highlighted.
http://congress.cimne.com/PANACM2015/frontal/doc/EbookPANACM2015.pdf
Fil: Godoy, Luis A. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Godoy, Luis A. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Estructuras; Argentina.
Fil: Jaca, Rossana C. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Ingeniería Civil; Argentina.
Fil: Sosa, Eduardo M. West Virginia University. Civil and Environmental Engineering Department; Estados Unidos.
Fil: Flores, Fernando G. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Flores, Fernando G. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Estructuras; Argentina.
Ingeniería Estructural