Bond of steel reinforcement to concrete was extensively studied worldwide during the last thirty years. However, few studies approach the evaluation of the effects of elevated temperatures on such load transfer mechanism and, in those, the presence of a sustained load applied prior to temperature increase is widely neglected. The present work investigates local bond properties between an ordinary carbon steel and an ordinary concrete when subjected to elevated temperatures, accounting as parameters the clear cover (and, more in general, the bar position), the bonded length and, mostly important, the effects of heating and loading sequence. Through test results and comparison with existing literature data it is shown that, for both pull-out and splitting failure modes, the effects of a sustained load on the evaluation of bond strength at a given temperature cannot be ignored for load levels higher than approximately sixty percent of the bond strength at cold state. Conditions for which the influence of the bonded length and of the bar position can be neglected in such assessment are also discussed.

Local bond properties of reinforcement in concrete subjected to elevated temperatures: Effects of clear cover, bonded length and heating and loading procedures

Muciaccia G.;Consiglio A. N.
2021

Abstract

Bond of steel reinforcement to concrete was extensively studied worldwide during the last thirty years. However, few studies approach the evaluation of the effects of elevated temperatures on such load transfer mechanism and, in those, the presence of a sustained load applied prior to temperature increase is widely neglected. The present work investigates local bond properties between an ordinary carbon steel and an ordinary concrete when subjected to elevated temperatures, accounting as parameters the clear cover (and, more in general, the bar position), the bonded length and, mostly important, the effects of heating and loading sequence. Through test results and comparison with existing literature data it is shown that, for both pull-out and splitting failure modes, the effects of a sustained load on the evaluation of bond strength at a given temperature cannot be ignored for load levels higher than approximately sixty percent of the bond strength at cold state. Conditions for which the influence of the bonded length and of the bar position can be neglected in such assessment are also discussed.
Anchorage
Bond to concrete
Effects of sustained load
Elevated temperatures
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1175148
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