Influenza della corrosione sul comportamento ciclico di pilastri in c.a.

The analysis of structures damaged by seismic actions has shown how, very often, poor mechanical properties and lack of structural detailing are combined to the corrosion presence in the rebars. This phenomenon, main cause of degradation in r.c. structures in non exceptional conditions, can have significant effects on the seismic behaviour, leading to dangerous strain localizations and variations of strength distribution and rotation capacity. Aim of the present work is the numerical evaluation of the influence of the corrosion of steel rebars on the cyclic behaviour of r.c. columns. The corrosion phenomenon is simulated accounting for both the geometrical and mechanical variations of the bar properties, furthermore the steel rebar buckling is considered. The model is validated through a comparison with the results of experimental tests developed at the University of Bergamo, on full-scale elements. The comparative analysis highlights the effectiveness of the numerical model in simulating the experimental response.