Innovative Method for Masonry Columns Confinement

Abstract

The paper deals with the presentation of a novel confinement approach for masonry columns, capable to overcome the drawbacks of the existing techniques either in terms of mechanical behavior or technological aspects. The research develops along with two main phases: numerical (completed) and experimental (in progress). Thus, they are here reported the numerical studies that show the improvements of the performances of masonry columns if reinforced through a non-conventional hooping system using “Dyneema ribbons”. The numerical models are realized using 3D solid f.e. with dimensions adjusted to fit the deformation gradients. The nonlinearity is concentrated at the mortar-brick joints. The bonding between ribbons and mortar is modelled using appropriate interface elements aimed at reproducing the stress transfer during installation and in working condition. It is also reported the design of a device able to guarantee a correct ribbons installation on site. Incremental non-linear static-equivalent analyses have been performed. The numerical analyses also compare similar solutions but with different strength and stiffness (Nylon ribbons).