System for protecting a body from motions transmitted through th

Details System for protecting a body from motions transmitted through th System for protecting a body from motions transmitted through th

1985-08-26

1986-05-13

Perham, Alfred C.

Static structures (e.g., buildings)

Means compensating earth-transmitted force

Relative motion means between a structure and its foundation

248560, 248634, E04H 902, E02D 2734

Patent

active

045877793

ABSTRACT:
A mechanically fully isolated body (D) is connected by mechanical isolators (C), behaving elastically in all directions, with its basis (B). This basis is linked firmly to the surrounding formation. There exists a frequency range called hole of eigenfrequencies between the highest (6) of the six lowest system eigenfrequencies (1-6)--called fundamental eigenfrequencies--and the lowest (7) of all higher eigenfrequencies (7,8 . . . )--called upper eigenfrequencies--of the oscillatory element consisting of the body (D) and the isolators (C). In this range the oscillatory element presents no eigenfrequencies. The hole of eigenfrequencies shall cover the range of resonance of the relevant design response spectrum of the excitation (E). By these measures the body resists to the strongest earthquakes measured or to be expected at that site.

REFERENCES:
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Earthquake Engineering and Structural Dynamics, vol. 7, pp. 555-568, Base Isolation Systems For Earthquake Protection of Multi-Storey Shear Structures, Lee & Medland.

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