Base isolation systems are one of the most successful and
widely-applied methods of mitigating structural vibration and
damage during seismic events. Base isolation systems have
been installed in numerous full-scale structures [3]. Sliding
isolator works on principle of friction. This approach is based
on the premise that the lower the friction coefficient, the less
the shear transmitted [4]. The type of base isolation technology
that is used in this study is the Triple Friction Pendulum (TFP)
bearing. The Triple Friction Pendulum (TFP) bearing differs
from the single Friction Pendulum (FP) bearing in that there
are 3 friction pendulum mechanisms existing in each bearing
instead of just 1 mechanism. These mechanisms are activated
at different stages as the seismic demand gets stronger. The 3
mechanisms are achieved by using 4 concave surfaces in a
single bearing, with sliding occurring on two of the surfaces at
a given time [5].An image of the TFP’s disassembled parts and
a cross section of a TFP bearing are shown in Figures A, B
below, respectively [6], [7]