The dissipative capacity of modern r.c. and composite steel/concrete structures is directly related to the rotational capacity of the elements in which plastic hinges are located: it strictly depends on the geometrical and mechanical characteristics of the sections and, moreover, on the ductile capacity of the steel reinforcing bars (deformation and dissipated energy). Nowadays the lowcycle fatigue/seismic behaviour of steel reinforcing bars is not well known and, at European level, no production control tests are prescribed for the mechanical characterisation of the seismic performance of reinforcing steels. This situation is well reflected in the framework of the revision of European standard EN10080 and in Mandate M115 which tends to harmonise production control for reinforcing steels also introducing low-cycle fatigue tests. Full knowledge about the effective ductility requirements imposed on bars by real seismic events is necessary: a detailed analysis of the ductility demand on reinforcements, considering both r.c. and composite steel/concrete structures, is consequently necessary and deeply analysed in the project. At the same time, the ductility capacity of steel reinforcing bars has been investigated considering also the detrimental effects due to aggressive environmental conditions, generally resulting in a progressive decrease of the mechanical characteristics of deformation, strength and dissipative capacity. The evaluation of the ability of corroded steel bars to still sustain the ductile requirements due to seismic action has been analysed, finally providing practical indications for the protection of bars from corrosion, in addition to what was already suggested by Eurocode 2

Effects of corrosion on low-cycle fatigue (seismic) behaviour of high-strength steel reinforcing bars (Rusteel)

SALVATORE, WALTER;CAPRILI, SILVIA;
2014-01-01

Abstract

The dissipative capacity of modern r.c. and composite steel/concrete structures is directly related to the rotational capacity of the elements in which plastic hinges are located: it strictly depends on the geometrical and mechanical characteristics of the sections and, moreover, on the ductile capacity of the steel reinforcing bars (deformation and dissipated energy). Nowadays the lowcycle fatigue/seismic behaviour of steel reinforcing bars is not well known and, at European level, no production control tests are prescribed for the mechanical characterisation of the seismic performance of reinforcing steels. This situation is well reflected in the framework of the revision of European standard EN10080 and in Mandate M115 which tends to harmonise production control for reinforcing steels also introducing low-cycle fatigue tests. Full knowledge about the effective ductility requirements imposed on bars by real seismic events is necessary: a detailed analysis of the ductility demand on reinforcements, considering both r.c. and composite steel/concrete structures, is consequently necessary and deeply analysed in the project. At the same time, the ductility capacity of steel reinforcing bars has been investigated considering also the detrimental effects due to aggressive environmental conditions, generally resulting in a progressive decrease of the mechanical characteristics of deformation, strength and dissipative capacity. The evaluation of the ability of corroded steel bars to still sustain the ductile requirements due to seismic action has been analysed, finally providing practical indications for the protection of bars from corrosion, in addition to what was already suggested by Eurocode 2
2014
Salvatore, Walter; Caprili, Silvia; Braconi, A.; Finetto, M.; Bianco, L.; Ascanio, C.; Moersch, J.; Apostolopoulos, C.; Ferreira Pimenta, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/752253
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