IN PLAN DISTRIBUTION OF ISOLATORS EFFECTIVE STIFFNESS FOR MINIMIZING THE TORSIONAL RESPONSE OF BASE ISOLATED BUILDINGS

Abstract eng:
The present study examines the influence of the isolators’ effective stiffness distribution on the torsional response of base isolated structures. To accomplish this purpose two asymmetric in plan R/C buildings are analyzed for two different distributions of isolators’ effective stiffness: (a) all the isolators have identical horizontal stiffness and (b) the isolators’ effective stiffness is chosen so as the optimum torsion axis of the structure to coincide with the vertical mass axis. The two buildings are subjected to linear as well as nonlinear time history analyses under three bidirectional earthquake ground motions. For each earthquake record the maximum response over all incident angles of seismic motion is determined. The analyses results reveal that the displacements of the structural elements located at the flexible side of the buildings as well as the rotations of the slabs are reduced significantly when the isolators’ effective stiffness is chosen so as the optimum torsion axis of the structure to coincide with the vertical mass axis.

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