: The elastomeric bearing systems are not likely to perform well under near-field and low frequency ground motions.
These ground motions contain pulse type and low frequency components respectively. Due to such type of components the
horizontal displacement of elastomeric bearing is very high.
The NZ system contains lead core, which adds damping in the system. Due to introduced damping the force deformation
behavior of NZ is nonlinear. This will restrict the horizontal displacement of NZ system. But even after this provision the
deformation of isolator is quite high. The sliding isolation system may perform better than elastomeric bearing system under
near-field and low frequency ground motions as large horizontal displacement of sliding system may not cause failure of the
system. However due to lack of restoring force in case of PF, the residual displacement of Pure friction (PF) may be quite high.
Frequency pendulum (FPS) has a constant frequency and if the isolator frequency of FPS and excitation frequency
