Tilt-Strain Changes Linked to a Jacking System Test

A sector of the San Marco Hospital (Catania, Italy) was the subject of
a jacking test in order to demonstrate the substitutability of the
seismic isolator. A monitoring system, included tiltmeters and strain
gauges, was applied to one column. Two distinct behaviours have
been identified during the unloading stage, the first in which the
column and the roof are still attached and a second in which the
detachment takes place. The jacking system caused the column to
return to its original position, induced by the building structure for
thermoelastic causes.