Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1976-10-12
1978-10-03
Murtagh, John E.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
E04B 134
Patent
active
041176375
ABSTRACT:
A cyclic shear energy absorber interposed or to be interposed between members of a structure which may be caused by incoming energy to oscillate relative to each other. Such an absorber would have application in isolating a structure such as a building or nuclear power station from movements of its foundation caused by an earthquake. Similarly such an absorber could also dampen movement of a building caused by high wind. The absorber of the invention makes use of the fact that when a metal is plastically deformed, energy is absorbed. Lead which is the best example of such a material from a practical point of view is able to recover and recrystallize within a second or so, thus making the energy absorbing material available to absorb energy resulting from a relative movement opposite to that that caused the immediately preceding deformation under shear.
REFERENCES:
patent: 2950576 (1960-08-01), Rubenstein
patent: 3554855 (1971-01-01), Dberst
Engineering-News Record, Apr. 23, 1959, p. 83.
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