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In this paper, the effectiveness of the base isolation on steel storage tanks has been investigated through numerical models and then checked by shaking table tests on a reduced scale (1:14) model of a real steel tank, typically used in petrochemical plants. In the experimental campaign the floating roof has also been taken into account. The tests have been performed on the physical model both in fixed and isolated base configurations; in particular two alternative base isolation systems have been used: high-damping rubber bearings devices and sliding isolators with elasto-plastic dampers. Finally, a comparison between experimental and numerical results has also been performed

This paper deals with the assessment of the seismic response of a portal frame pier belonging to an old reinforced\ud concrete viaduct. A series of tests, consisting of cyclically imposed displacements, were carried out\ud on three 1:4 scale mock-ups. The objective of the experimental campaign is twofold: (1) identification and evaluation of the local failure mechanisms and (2) calibration of a numerical model including all observed nonlinear phenomena. The experimental results show that the shear strength of the transverse beam and of\ud the beam–column joints characterizes the post-elastic behavior of the piers. Other phenomena, like bond-slip\ud and buckling of the longitudinal bars of the columns, typical of old reinforced concrete structures have also\ud been observed. Finally, a numerical model, built in OpenSEES, was calibrated to reproduce in a satisfactory\ud way the experimental results and to provide a reliable tool for the evaluation of the seismic response of the\ud pier