Progettazione dell'armatura trasversale in funzione della duttilità di curvatura richiesta: prima formulazione di base

In designing RC membratures subjected to flexure and axial load a crucial point is the amount of transverse reinforcement to be applied to critical regions of columns. It allows to achieve the required section ductility coherently with the assumed global ductility. This approach is adopted by recent seismic codes which provide design equations linking the transverse reinforcement amount to the ductility curvature of critical regions and to the axial load ratio of a column. In line with this approach parametric analyses on fiber sections reinforced by simple hoops under flexure and axial load have been performed. Confinement effects have been computed with the analytical model proposed by Braga, Gigliotti and Laterza (2006). Starting from the obtained results design equation of transverse reinforcement amount has been proposed. By applying the used methodology design equations referring to different arrangements of transverse reinforcement may be proposed in future works.