Characterization and dynamic behaviour of Masonry Newly Concept Vault realized by 3d Printer

Masonry vaults represent one of the most recurrent types of horizontal structural elements in architecture in European countries, even in areas characterized by a high level of seismic risk. Therefore, their structural evaluation remains of primary importance. This paper proposes to apply already consolidated structural analysis methodologies on a contemporary vaulted space; in particular, on a small-scaled vault model. The aim, therefore, is to investigate the behaviour of a newly concept vault generated starting from the "Flat vault of Abeille"patented in 1699 starting by a scaled model made by 3D printer. The identification of this "new type"of vault is essential to design it correctly and to optimize the geometry for structural purposes. So, the dynamic identification of 1:8 small-scale vault model in 3D printing was studied. All the vault blocks were made in Polylactic Acid (PLA), have an infill of 70% and are assembled with dry joints. The paper describes the process to acquire the environmental and forced vibrations and to analyse them with the Operational Modal Analysis (OMA), identifying the natural frequencies and the mode shapes. Subsequently the results were compared with those of numerical distinct element method (DEM).