STUDIO SPERIMENTALE SU CONNESSIONI PILASTRO-FONDAZIONE PER STRUTTURE PREFABBRICATE

This paper describes the experimental characterization of column-to-foundation joints in precast concrete elements, in particular regarding horizontal cyclic loads. This issue gains particular interest in case of seismic actions. The work is part of a wider EU research project called SAFECAST. The tests are carried out to compare different connection systems: wet joints with expansive grouted mortar connecting the rebars protruding from the column and innovative semi-dry mechanical connections. All the connections have been inserted within similar full scale members (columns with a 40x40 cm section, 2.50 m high) and tested with a loading protocol with increasing intensity. The columns have been tested under axial compression of 380 kN. The aim of the tests is to measure the final capacity of each joint when subjected to cyclic horizontal loads, assessing its ductility, energy dissipation and extension of plastic hinge. A numerical investigation has been carried out with the aim to provide simple tools for the designers and its comparison with the experimental results shows its effectiveness.