The thesis focuses on a new, alternative design philosophy for the classification of steel hollow cross-sections, the Overall Interaction Concept (O.I.C.); the proposed approach represents an innovation compared to the classic cross-section classification system provided by Eurocode 3 and other national design standards, since it makes use of the interaction between the two ideal behaviours of structural members resistance and instability and includes the influence of initial imperfections to calculate the resistance of a structure through a single parameter λ, that is the relative slenderness. The aim of this thesis is to demonstrate the accuracy of the O.I.C. through a series of numerical parametric studies based on a finite element model; in order to calibrate this model reference has been made to an experimental campaign on several cross-sections, carried out as a part of a European project named ‘HOLLOSSTAB’. Accordingly, since the finite element model was proved to well represent the hollow cross-section behaviour, finite elements simulations were performed on square and rectangular hollow sections, subjected to different load cases, mono-axial bending (My) or bi-axial bending (My + Mz) combined with axial compression (N). Based on these computations, design proposal was made within the context of the Overall Interaction Concept. The results show that this innovative design approach, the O.I.C., adequately capture the behaviour of hollow sections in a straightforward and simple manner and highlight its challenging and potential.
L'Overall Interaction Concept: un nuovo metodo pratico per la progettazione di sezioni in acciaio rettangolari e quadrate
The Overall Interaction Concept: new practical design method for rectangular and square steel hollows sections
NOE', BEATRICE
2016/2017
Abstract
The thesis focuses on a new, alternative design philosophy for the classification of steel hollow cross-sections, the Overall Interaction Concept (O.I.C.); the proposed approach represents an innovation compared to the classic cross-section classification system provided by Eurocode 3 and other national design standards, since it makes use of the interaction between the two ideal behaviours of structural members resistance and instability and includes the influence of initial imperfections to calculate the resistance of a structure through a single parameter λ, that is the relative slenderness. The aim of this thesis is to demonstrate the accuracy of the O.I.C. through a series of numerical parametric studies based on a finite element model; in order to calibrate this model reference has been made to an experimental campaign on several cross-sections, carried out as a part of a European project named ‘HOLLOSSTAB’. Accordingly, since the finite element model was proved to well represent the hollow cross-section behaviour, finite elements simulations were performed on square and rectangular hollow sections, subjected to different load cases, mono-axial bending (My) or bi-axial bending (My + Mz) combined with axial compression (N). Based on these computations, design proposal was made within the context of the Overall Interaction Concept. The results show that this innovative design approach, the O.I.C., adequately capture the behaviour of hollow sections in a straightforward and simple manner and highlight its challenging and potential.È consentito all'utente scaricare e condividere i documenti disponibili a testo pieno in UNITESI UNIPV nel rispetto della licenza Creative Commons del tipo CC BY NC ND.
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https://hdl.handle.net/20.500.14239/25851