In recent years, the need to develop a new typology of steel reinforcement bars provided with enhanced properties in terms of ductility and durability towards aggressive environmental conditions increased progressively: the main reason for this can be found in the decrease of deformation capacity under both monotonic and cyclic loading conditions observed for the most part of actual reinforcing steels (e.g. Tempcore®) in presence of corrosion phenomena. The positively concluded NEWREBAR research project aimed to develop a new reinforcing steel grade with improved durability and ductility performance thanks to its Dual-Phase microstructure and to a specific selection of chemical components kept with in the range of the actual european production. In order to understand the influence of Dual- Phase steel bars on the structural behaviour of RC constructions, case study buildings were designed, modelled and analysed through Incremental Dynamic Analyses, and compared with traditional buildings using Tempcore® rebars. An accurate modelling of plastic hinges was employed to correctly account for the higher deformation capacity of Dual-Phase steel and its undefined yielding stress-strain behaviour: moment/rotation relationships were calibrated based on the results of experimental tests performed on full-scale prototypes. In the present work, the results of the aforementioned nonlinear dynamic analysis and the evaluation of Expected Annual Loss (EAL) is presented for case-study building using both Dual-Phase and Tempcore® rebars, in reference and corroded conditions, with the aim of comparing their structural performance evaluating the real benefit of adopting the two steel grades.
A comparison between RC buildings with Dual-Phase and TempCore® bars in reference and corroded conditions
Silvia Caprili;Francesca Mattei;Walter Salvatore
2020-01-01
Abstract
In recent years, the need to develop a new typology of steel reinforcement bars provided with enhanced properties in terms of ductility and durability towards aggressive environmental conditions increased progressively: the main reason for this can be found in the decrease of deformation capacity under both monotonic and cyclic loading conditions observed for the most part of actual reinforcing steels (e.g. Tempcore®) in presence of corrosion phenomena. The positively concluded NEWREBAR research project aimed to develop a new reinforcing steel grade with improved durability and ductility performance thanks to its Dual-Phase microstructure and to a specific selection of chemical components kept with in the range of the actual european production. In order to understand the influence of Dual- Phase steel bars on the structural behaviour of RC constructions, case study buildings were designed, modelled and analysed through Incremental Dynamic Analyses, and compared with traditional buildings using Tempcore® rebars. An accurate modelling of plastic hinges was employed to correctly account for the higher deformation capacity of Dual-Phase steel and its undefined yielding stress-strain behaviour: moment/rotation relationships were calibrated based on the results of experimental tests performed on full-scale prototypes. In the present work, the results of the aforementioned nonlinear dynamic analysis and the evaluation of Expected Annual Loss (EAL) is presented for case-study building using both Dual-Phase and Tempcore® rebars, in reference and corroded conditions, with the aim of comparing their structural performance evaluating the real benefit of adopting the two steel grades.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
