Double steel pipe structural member

Details Double steel pipe structural member Double steel pipe structural member

1994-05-25

1996-03-12

Knight, Anthony

Joints and connections

Branched

Three or more radiating members

403169, 403 41, 521673, 526551, E04B 134, E04B 138

Patent

active

054980941

ABSTRACT:
A double steel pipe structural member comprises an external pipe and an internal pipe. The external pipe is provided with a thin steel pipe part and thick steel pipe parts formed at each of the ends of the thin part. The thickness of the thick part is 1.5 to 1.7 times the thickness of the thin part. The internal pipe is disposed so as to overlap not only with the thin part but with the thick part of the external pipe. The internal pipe behaves as a bending resistant pipe against the external pipe so that the external pipe may deform plastically in the longitudinal direction thereof after an axial compressive force exceeds the yield strength of the external pipe. The deformation is axially symmetrical along the outer surface of the internal pipe. A truss structure including the double steel pipe, is prevented from immediately collapsing when a building having the truss structure encounters a big earthquake or the like.

REFERENCES:
patent: 2149844 (1939-03-01), George
patent: 2970388 (1961-02-01), Yonkers
patent: 3864049 (1975-02-01), Ono
patent: 3981114 (1976-09-01), Chupick
patent: 4281487 (1981-08-01), Koller
patent: 4872779 (1989-10-01), Imai
patent: 5141351 (1992-08-01), Imai

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