Lead Rubber Bearings ISOSISM LRB

The Isosism LRB isolators consist of alternate layers of rubber and vulcanised reinforcement steel plates of limited thickness and a central lead core. They allow the isolation of the structure by a proper selection of the horizontal stiffness and they can dissipate energy up to 30% damping due, to the high damping capacity of the lead core. The damping value of 30% is normally the maximum damping to model the device as linear according to the international design standards.

The Isosism LRB isolators fulfil the following requirements:

-        Transmit the vertical loads due to permanent and accidental effects;

-        Capacity to support horizontal loads due to service load conditions with very low displacements

-        Capacity to isolate the structure by shifting the fundamental vibration period to an optimal and safe level

-        Capacity to dissipate energy to reduce the horizontal displacement of the isolated structure with respect to the ground

LRB isolators have the following advantages:

-        No damage to the structure that remains due to the elastic response for high intensity earthquakes with no interruption of the structural function. This is a primary goal for strategic structures (hospitals, control rooms, ecc…)

-        Very well known and used in many application both for building and bridges

-        Very simple maintenance mainly limited to a periodic visual inspection for all the design life

-        Capacity to reduce the seismic energy from the ground to the structure with consequent simplification of the structure design