The fundamental period can be
lengthened away from the rich periods contents
of earthquake motions by using LRB devices.
The accumulated seismic energy in the base
isolator can be dissipated by the viscous damping.
The seismic responses of the superstructure
can be effectively dissipated when the fundamental
periods of the base isolated structure are
in the vicinity of the long predominant periods
of an earthquake.
It is unsuitable for light structures or
structures with varying masses.
The behavior of the material of rubber and
lead is dependent on the temperature.
It is cost effective. However, its disadvantages
are fireproofing capability and poisonous lead.
In 2007, lead materials will be banned in
the European Union.