Static structures (e.g. – buildings) – Shaped or strengthened by fluid pressure – Fluid pressure is subatmospheric
Patent
1984-11-13
1987-08-11
Murtagh, John E.
Static structures (e.g., buildings)
Shaped or strengthened by fluid pressure
Fluid pressure is subatmospheric
52223R, E04C 300
Patent
active
046852530
ABSTRACT:
The structural member of the present invention includes a pressure tube either having a cable tensioned between its ends or being mounted within an outer member. The pressure tube is mounted such that it can move axially with respect to the cable or the outer tube. When the tube is pressurized, some of the force is absorbed in hoop stress in the tube, and some of the force is directed to the ends of the pressure tube and to the cable or the outer member either through a piston arrangement or otherwise. When compressive loads are placed on the system, it can support force up to the preload without exhibiting Euler buckling. The system is useful for long, thin columns and for long beams where ridgidity is important. The pressure tube is not subject to compressive loading because its ends are free to move axially without compressing the tube. The pressure tube may be wrapped in high tensile strength unidirectional fiber material to withstand higher hoop strees.
REFERENCES:
patent: 1302293 (1919-04-01), Blazer
patent: 2857755 (1958-10-01), Werth
patent: 3153789 (1964-10-01), Ashton
patent: 3167882 (1965-02-01), Abbott
patent: 3232638 (1966-02-01), Hollander
patent: 3516211 (1970-06-01), Rieve
patent: 3538653 (1970-11-01), Meckler
patent: 3796017 (1974-03-01), Meckler
patent: 4313287 (1982-02-01), Romig
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