Concrete structures

Details Concrete structures Concrete structures

1976-02-10

1977-05-17

Faw, Jr., Price C.

Static structures (e.g., buildings)

Monolith with sustainer and means tensioning additional...

52259, 52263, 52745, E04C 320, E04B 118

Patent

active

040233189

ABSTRACT:
A concrete structure in which a post-tensioned concrete slab is supported by columns, each column being surrounded or partly surrounded by an area of concrete in the form of a hollow inverted pyramid, the column passing through the apex of the pyramid. The area concerned is formed integrally with the remainder of the slab and is of substantially uniform thickness sloping downwardly from the surrounding concrete towards the column at an angle .theta. to the horizontal such that tan .theta. lies in the range of 0.1 to 0.25 or in the case of a column near an edge or corner of the structure 0.1 to 0.35. The area is bounded by a system of reinforcing post-tensioned members passing through the slab which lies within a strip thickness of the slab, the crack spacing of the concrete surrounding the post-tensioned members in that strip at ultimate strength being not more than 18 inches and preferably within the range of 6 to 10 inches and the strength of the concrete in a section at the face of the column being between 1.3 and 2.0 of the resultant tension component of the surrounding post-tensioned members at ultimate strength. A combination of the foregoing characteristics provides a structure which enables the spacing between adjacent columns to be increased in relation to the spacing required in known comparable forms of construction.

REFERENCES:
patent: 1461892 (1923-07-01), Coney
patent: 3380209 (1968-04-01), Cheskin

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