Limit and shakedown analysis of 3-D steel frames

Otimização Topológica considerando Análise Limite

“…The collapse load of a structure may be assessed by limit analysis in spite of elastoplastic analysis. Limit analysis is based on set of fundamental collapse theorems of plasticity [19,20], and it is applicable for a great variety of problems such as plane stress and plane strain [21,22,23,24]; trusses [25]; frames [26,27,28,29]; bending plates [30,31,32]; and three dimensional models [33,34]. Finite element discretization is adopted in most of these works [35,36,37], but it has been shown [38] that the element-free Galerkin approach [39] and the boundary element approach [40,41] are also possible.…”

Second-order plastic-hinge analysis of 3-D steel frames including strain hardening effects

“…However, when the axial plastic displacement is taken into account in rigid-plastic analysis, twelve-degrees-of-freedom is not enough to describe the deformation of a beam-column element. Because CEPAO program is a package for elastic-plastic and rigid-plastic analysis [16,17], thirteen-degrees-of-freedom element must be used such that the fundamental equation (compatibility and equilibrium relations) may be applied in every subroutine. Therefore, we here present the thirteen-degrees-of-freedom element formulation.…”

“…Geometric nonlinearity is taken into account by conventional second-order plastic hinge approach where the stability functions are adopted. The techniques mentioned have been implemented in the CEPAO computer program, a package for plastic-hinge analysis and optimization of frame structures [16,17]. In our work, both torsional stiffness and the effect of the shear force are negligible.…”

Ανάλυση Προσαρμογής Μεταλλικών Κατασκευών Υποβαλλόμενων Σε Αβέβαιη Ελλειψοειδή Φόρτιση Με Τεχνικές Στιβαρής Βελτιστοποίησης

“…Μία επαναληπτική μέθοδος με διαδοχική γραμμικοποίηση των κριτηρίων πλαισίων από οπλισμένο σκυρόδεμα παρουσιάζεται στην [MC08], η οποία μπορεί να εφαρμοστεί σε μεταλλικά πλαίσια. Ένα πρόσφατο παράδειγμα πλαστικής ανάλυσης τριδιάστατων μεταλλικών πλαισίων παρουσιάζεται στην εργασία [VLDH08].…”