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Ground - supported cylindrical tanks are used to store a variety of liquids. This paper provides the theoretical background for takes into account impulsive and convective (sloshing) actions of the fluid in concrete containers fixed to rigid foundations; it has been adopted in Eurocode 8. Seismic responses - base shears, the bending and overturning moments – are calculated by using the response spectra of the earthquake in Loma Prieta, California (18.10.1989). As the examples is analyzed the ground supported cylindrical concrete tanks, fluid filling is H = 2 m and R are depended from tank slenderness ratio? = H/R. For considered tank slenderness ratios ? = 0.3, 0.5, 0.7, 1, 2, 3 Rare given 6.667 m, 4 m, 2.857 m, 2 m, 1 m and 0.667 m.
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