Fundamental working principle of earthquake base-isolated
structures is presented using analytical shear beam model and
discrete 2D and 3D models. The behavior of base-isolated building
and influence of the shape of isolator force-deformation loops on
its response is studied. The effects of torsional coupling, due to
isolator parameters such as the isolation stiffness and/or yield
strength, on the seismic response of base-isolated buildings are
computed along with the other sources of asymmetries. The dynamics
of impact problem in base-isolated buildings is studied through
closed-form solutions for shear beam model, wherein free-vibration
and earthquake-induced forced-vibration analyses are carried out.
The seismic response of multi-story base-isolated symmetric and
single-story asymmetric buildings during impact with the adjacent
structures under earthquakes is studied. Performance of various
isolation devices used in practice categorized as elastomeric and
sliding systems is compared during impact condition. The mitigation
of impact failures is suggested by introducing viscous or
visco-elastic dampers for energy dissipation and seismic response
control in the adjacent buildings.
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