DUAL-PHASE STEEL REINFORCING BARS FOR MRFS STRUCTURES IN SEISMIC PRONE AREAS

Abstract eng:
Reinforced concrete structures in seismic areas are designed according to the capacity design approach, aiming to achieve ductile global collapse mechanisms dissipating the seismic energy through high deformations in correspondence of the ends of beams and columns. The global dissipative capacity of the building is related to the rotational capacity of sections and to the ductile properties of reinforcing bars. TempCore steel is used for RC constructions, due to its optimal strength and ductility properties and to the satisfaction of Eurocode 8 requirements concerning Agt and Rm/Re. Several studies in the current scientific literature anyway highlighted durability problems of TempCore bars exposed to corrosion conditions, with loss of ductility and strength even below the standards requirements. DualPhase (DP) steels, characterized by excellent mechanical and durability properties due to their Ferrite-Martensite microstructure and commonly adopted in the automotive sector, can be a possible solution to the problem. The possibility to produce DP rebars for RC structures is deeply analyzed in the European research project NEWREBAR “New Dual-Phase steel reinforcing bars for enhancing capacity and durability of anti-seismic moment resisting frames”, actually ongoing. The elaboration of new technical models for the design of RC elements, to be implemented in design guidelines and standards, is needed. In the present paper, preliminary results are presented concerning the selection of DP steel bars and the definition of technical models for RC elements with DP reinforcements.

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