ABSTRACT
ABSTRACT: The bond-slip correlation proposed by CEB is the most commonly adopted to predict slip displacements at the interface between steel bars and concrete.As known, the CEB model is based upon experimental results, obtained from pull-out tests performed on bars anchored by concrete for a limited length (usually 5 φ). In real beams the steel bar is usually bonded for a much longer length, and even in presence of concrete cracks, the maximum slip does not generally reach the values predicted by the CEB curve. An evidence of the above has been observed analysing experimental data, registered during a wide campaign for testing full scale r.c. beam to column joints, carried out by the Authors. Consequently, it has been calibrated a modified τ − s curve and an innovative test arrangement has been proposed, able to investigate bond-slip correlation for rebars in actual anchoring conditions.
