SESYCOWA Seismic behaviour of structural systems composed of cast in situ concrete walls ‐ Final Report ‐

The present document reports the outcomes of an experimental test campaign for the assessment of the seismic behaviour of a full-scale 3-storey structural system composed of cast-in-situ squat sandwich concrete walls. The structural system, which has been developed by the Italian company Nidyon Costruzioni S.p.a. and referred to as Nidyon NYSP, is based on the production and use of prefabricated modular pre-reinforced polystyrene panels (which therefore will be simply referred as modular panels) which act as support for the placing of the structural concrete (typically shotcrete). Modular panels are assembled at the site in order to obtain the so called support wall. Once the support walls are set in place, two layers of concrete (each one of about 40 mm in thickness) are sprayed on each side to obtain the r/c wall. Nidyon NYSP is characterized by limited costs, fast construction, high thermal and acoustic performance and is typically used for the construction of mid-rise residential building. The final structural solution is the result of a comprehensive research work ,started at the beginning of ‘90s, carried out by the University of Bologna aimed at characterizing both the monotonic in plane and out of plane static behaviour and the in-plane cyclic behaviour of single walls (with and without opening) and coupled walls. The results of the work lead to the formulation of analytical relationship (validated through pseudo-static cyclic tests) for the prediction of the seismic behaviour of the system. In order to verify the actual seismic behaviour of the above structural system shacking table tests on a full-scale prototype building, representative of a mid-rise residential building, appears the most meaningful test typology. It should be noted that, while the description of the construction system and the results of the experimental tests are specifically referred to the products of Nidyon Costruzioni S.p.a. (Rimini,Italy); nonetheless, the observations and the conclusions may be extended to structural systems having similar characteristics.