Interactions domains for buckling of isolated r.c. columns represent an efficient and versatile instrument for the evaluation of the resistance at ULS and allow also the optimisation of structural geometry and section reinforcement. The paper presents the above mentioned domains for rectangular symmetrically reinforced columns and provides a detailed analysis of the load-carrying capacity for various classes of concrete and reinforcement steel. Domains have been obtained according to the model-column method, taking into account the uncertainties both in geometry and in the position of axial loads. The effects related to creep phenomena are ignored. In order to facilitate the practical utilization, the generic domain has been approximated by a two-branch curve, parabolic and elliptic. The first-one is related to axially-dominated rupture, the second one to flexural crisis. This approximation leads to simple closed-form expressions, particularly suitable for engineering preliminary design.
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|Titolo:||Interaction domains for buckling of isolated R.C. columns|
|Data di pubblicazione:||2006|
|Nome del convegno:||2nd Fib International Congress|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|