Seismic Analysis of a Base Isolated Structure

Abstract

This paper presents the seismic analysis of a structural model with fixed base and isolated with a multi-stage system made up of four layers of elastomeric bearings.
The steel structure has an opening of 1.4 m, a span of 1 m and a height of 1.5 m. The seismic analysis of structure was performed in SAP2000 program.
The aim of this paper is to study the behavior of the base isolated structure with a multi-stage system, in the case of some artificial accelerograms compatible with the elastic response spectrum for the horizontal components of ground acceleration, in areas characterized by the corner period Tc=0.7s, as recommended by the P100-2013 design norm.
The artificial accelerograms were generated using the ANCO SPECTIME program. The accelerograms are characterized by a peak ground acceleration of 0.3g, a duration of 45 seconds, 2250 steps at equal time intervals of 0.02 seconds.
Following the numerical analyses of the structural model, it was noticed that the effect of seismic actions was reduced for each accelerogram and the multi-stage isolation system can take over large displacements safely.