Longitudinal bar buckling behavior
| Contribuinte(s) |
Ceccoli, Claudio |
|---|---|
| Data(s) |
20/03/2008
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| Resumo |
Reinforced concrete columns might fail because of buckling of the longitudinal reinforcing bar when exposed to earthquake motions. Depending on the hoop stiffness and the length-over-diameter ratio, the instability can be local (in between two subsequent hoops) or global (the buckling length comprises several hoop spacings). To get insight into the topic, an extensive literary research of 19 existing models has been carried out including different approaches and assumptions which yield different results. Finite element fiberanalysis was carried out to study the local buckling behavior with varying length-over-diameter and initial imperfection-over-diameter ratios. The comparison of the analytical results with some experimental results shows good agreement before the post buckling behavior undergoes large deformation. Furthermore, different global buckling analysis cases were run considering the influence of different parameters; for certain hoop stiffnesses and length-over-diameter ratios local buckling was encountered. A parametric study yields an adimensional critical stress in function of a stiffness ratio characterized by the reinforcement configuration. Colonne in cemento armato possono collassare per via dell’instabilità dell’armatura longitudinale se sottoposte all’azione di un sisma. In funzione della rigidezza dei ferri trasversali e del rapporto lunghezza d’inflessione-diametro, l’instabilità può essere locale (fra due staffe adiacenti) o globale (la lunghezza d’instabilità comprende alcune staffe). Per introdurre alla materia, è proposta un’esauriente ricerca bibliografica di 19 modelli esistenti che include approcci e ipotesi differenti che portano a risultati distinti. Tramite un’analisi a fibre e elementi finiti si è studiata l’instabilità locale con vari rapporti lunghezza d’inflessione-diametro e imperfezione iniziale-diametro. Il confronto dei risultati analitici con quelli sperimentali mostra una buona coincidenza fino al raggiungimento di grandi spostamenti. Inoltre, il caso d’instabilità globale è stato simulato valutando l’influenza di vari parametri; per certe configurazioni di rigidezza delle staffe e lunghezza d’inflessione-diametro si hanno ottenuto casi di instabilità locale. Uno studio parametrico ha permesso di ottenere un carico critico adimensionale in funzione del rapporto di rigidezza dato dalle caratteristiche dell’armatura. |
| Formato |
application/pdf |
| Identificador |
http://amslaurea.unibo.it/94/1/Longitudinal_bar_buckling_behaviour.pdf Moroder, Daniel (2008) Longitudinal bar buckling behavior. [Laurea specialistica], Università di Bologna, Corso di Studio in Ingegneria civile [LS-DM509] <http://amslaurea.unibo.it/view/cds/CDS0452/> |
| Relação |
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| Direitos |
info:eu-repo/semantics/restrictedAccess |
| Palavras-Chave | #Instabilità, barre longitudinali, confinamento da staffe, collasso di colonne in cemento armato, strutture in cemento armato, buckling,longitudinal bar, tie confinement, failure of RC members. #scuola :: 843884 :: Ingegneria e Architettura #cds :: 0452 :: Ingegneria civile [LS-DM509] #sessione :: terza |
| Tipo |
PeerReviewed |
