Modern codes for the seismic design of Reinforced Concrete (RC) structures aim to obtain a global ductile collapse mechanism with concentration of plastic deformations in pre-selected zones. The controlled development of plastic hinges at the ends of beams and first floor’s columns of Moment Resisting Frames (MRF) underlines the importance of the structural ductility, directly related to the rotational capacity of elements and, therefore, to the mechanical performance of materials. Aggressive environmental conditions can, otherwise, lead to the rapid decrease of both the bearing and deformation capacity of structural components, with alteration of the collapse modality and reduction of the energy dissipation due the deterioration of the mechanical properties of both concrete and rebars. Corrosion phenomena highly affect the behaviour of reinforcements, causing relevant decrease of the deformation capacity, as widely evidenced in the case of traditional TempCore® rebars. Enhanced steel bars with Dual-Phase (DP) microstructure, characterized by improved durability towards aggressive environmental conditions, were therefore developed to provide a valid alternative to traditional reinforcements. Despite their competitive mechanical performance, the not-defined yielding stress-strain curve of DP rebars requires an accurate analysis of the sections, elements and whole structure performance, whose results are showed in the present work with reference to a RC-DP case study building. The execution of nonlinear incremental dynamic analyses (IDA) allows to highlight differences, pros and cons of the adoption of DP reinforcing bars.
Structural response of RC buildings with Dual-Phase reinforcing steel
Silvia Caprili;Francesca Mattei;Walter Salvatore;
2019-01-01
Abstract
Modern codes for the seismic design of Reinforced Concrete (RC) structures aim to obtain a global ductile collapse mechanism with concentration of plastic deformations in pre-selected zones. The controlled development of plastic hinges at the ends of beams and first floor’s columns of Moment Resisting Frames (MRF) underlines the importance of the structural ductility, directly related to the rotational capacity of elements and, therefore, to the mechanical performance of materials. Aggressive environmental conditions can, otherwise, lead to the rapid decrease of both the bearing and deformation capacity of structural components, with alteration of the collapse modality and reduction of the energy dissipation due the deterioration of the mechanical properties of both concrete and rebars. Corrosion phenomena highly affect the behaviour of reinforcements, causing relevant decrease of the deformation capacity, as widely evidenced in the case of traditional TempCore® rebars. Enhanced steel bars with Dual-Phase (DP) microstructure, characterized by improved durability towards aggressive environmental conditions, were therefore developed to provide a valid alternative to traditional reinforcements. Despite their competitive mechanical performance, the not-defined yielding stress-strain curve of DP rebars requires an accurate analysis of the sections, elements and whole structure performance, whose results are showed in the present work with reference to a RC-DP case study building. The execution of nonlinear incremental dynamic analyses (IDA) allows to highlight differences, pros and cons of the adoption of DP reinforcing bars.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
