Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Cross bracing
Patent
1994-03-22
1996-10-01
Friedman, Carl D.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Cross bracing
521679, E04H 902
Patent
active
055601626
ABSTRACT:
A seismic brake assembly comprises an annular pipe journaled through a gripping block which frictionally engages the pipe about the pipe's outer diameter. The force with which the gripping block frictionally engages the pipe is controlled by a Belleville or spring-loaded washer. By securing the gripping block to one point in a structure and by securing one end of the pipe to another point in or associated with the same building or structure to be supported, the seismic brake functions as a rigid member of applied lateral stresses less than a design threshold. When the applied lateral force exceeds the design threshold, controlled sliding friction between the rod and gripping block is experienced, whereupon the building or structural framing returns the seismic brake to its nominal position when the seismic activity ceases. By controlling various factors including the diameter of the pipe and the tension with which the block engages the pipe, virtually any desired hysteresis loop may be achieved.
REFERENCES:
patent: 3606704 (1971-09-01), Denton
patent: 4004766 (1977-01-01), Long
patent: 4182504 (1980-01-01), Bernhard
patent: 4262869 (1981-04-01), Menshen
patent: 4270250 (1981-06-01), Schon
patent: 4577826 (1986-03-01), Bergstrom et al.
patent: 5065552 (1991-11-01), Kobori et al.
Friedman Carl D.
Richardson Yvonne Horton
Tekton
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