A simplified method to predict torsional effects on asymmetric seismic isolated buildings under bi-directional earthquake components
The assessment of maximum displacement demand is a crucial point in the design of seismic
isolating systems, in particular when the non linear behaviour of devices is modeled
through visco-elastic equivalent schemes, as common in the design practice. Several phenomena
influence the maximum demand assessment, among which the torsional and earthquake
directionality effects can be of great impact. International codes use some formulations
which allow to consider torsional effects, while the impact of the other phenomena