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Bearing for Earthquake Isolation with Double Sliding Horizontal Surface

Federico Bartolozzi
During an earthquake, the proposed bearing allows the foundation-soil complex to move in a any direction, sliding with respect a movable mass. In turn, this mass moves in opposite direction to the motion, sliding between two horizontal and parallel surfaces, with respect to both the movable foundation-soil complex and the overhanging building, which remains almost motionless. The displacement of the movable mass, which occurs on the basis to the the vector composition of the motion components X and Y, is due to movable devices present in opening provided in the building. The earthquake isolation system, using this bearing, presents the following features:
•the seismic energy in the building amounts to around 1% of the building weight, using bearings with sliding friction (bearings with pure Teflon on sliding level double surface); this energy is negligible, using bearings with rolling friction (bearings with double steel ball on sliding level double surface);
•independence of the system from the seismic frequency, due to the total absence of building natural frequency;
•very financially competitiveness in comparison with all systems with total and partial absorption of seismic energy;
•substantial decrease in the phycho-physical discomfort in the ihabitants, due to the immobility of the building during an earthquake.
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