0000000000321880
AUTHOR
Rosanna Stadarelli
Isolamento sismico di un serbatoio a Priolo Gargallo (SR)
The paper relates the operations made for the seismic isolation of a tank located in Priolo Gargallo, in the Siracusa industrial area. The tank, built during the end of the seventies, is formed by a cylindrical steel shell, filled by a low temperature liquid, rested on a concrete slab, embedded on 139 columns, fitted together with the same number of foundation piles driven in the soil for about 12 meters. The friction pendulum bearing seismic devices have been adopted, installed in the superior part of the columns through the cut of a small section of the same. The intervention foresees the execution of a concrete slab at grade level, which has the functions to link all the pile heads, to f…
Interventi di miglioramento e adeguamento sismico di edifici in c.a. dell’Azienda Ospedaliera Universitaria Policlinico “Paolo Giaccone” di Palermo
The paper shows the results of an experimental investigation on the behaviour of compressed concrete columns subjected to the overcoring technique. Extraction of cylindrical concrete cores in perpendicular direction to the column surface, was achieved by rotary drilling using a diamond tipped hollow barrel. Core is gradually isolated from the stress field in the surrounding concrete and at every advancing step the re-equilibrium deformation response is measured by means of four strain-gauges, placed on its external surface and near the hole. Finally the original stress state is computed in the elastic phase on the basis of recorded strains, knowing the elastic properties of concrete and by …