Reinforced concrete columns strengthened with angles and battens subjected to eccentric load

The aim of the work is, on the one hand, the presentation of a theoretical fiber model able to predict the moment–curvature behaviour of RC columns confined by means of angles and battens and, on the other hand, the validation of the proposed model by means of the comparison between analytical results and experimental evidence coming from 13 specimens tested under axial force–moment interaction.The analytical model is able to account for many parameters often neglected in current design practice, such as the influence of both hoops and battens on concrete confinement, the buckling of longitudinal bars and the influence of the structural detail aimed at assuring the continuity through the concrete floor slab which affects the angle behaviour. The proposed model has been used for predicting the load carrying capacity of both unstrengthened and strengthened columns, obtaining a good degree of accuracy. In addition, the comparison in terms of moment–rotation curves has been performed, showing the model accuracy in predicting the structural response in the whole deformation range.