Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1984-05-18
1985-11-26
Raduazo, Henry E.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
E04B 198
Patent
active
045547670
ABSTRACT:
A base isolation system for a structure for protecting against earthquakes. The superstructure is supported on a first and second discs, one above the other. Between the discs, and between the lower disc and the foundation there are elastomeric or similar support means which provide restoring forces if the structure is displaced by oscillations of the ground. Means are provided so that one set of elastomeric or similar support means is subjected only to horizontal oscillations. The other support means is subjected to vertical oscillations and, if desired, rotations, but not horizontal oscillations. Connecting means also may be provided to allow slow vertical displacements of the second support means but to prevent rapid vertical displacements until a predetermined vertical force is supplied. These means disconnect if rapid oscillations occur with strong forces; when these means disconnect, the structure can oscillate through greater vertical displacements, by means of the elastomeric support means. Connecting means also may be provided to prevent relative horizontal translations between the discs (or between the disc and the foundation) which are connected by the said first set of elastomeric support means.
REFERENCES:
patent: 1572574 (1926-02-01), Stromborg
patent: 2055000 (1936-09-01), Bucigalupo
patent: 3789174 (1974-01-01), Barkan
patent: 4102097 (1978-07-01), Zolotay
patent: 4179104 (1979-12-01), Skinner
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