Static structures (e.g. – buildings) – With component having discrete prestressing means – Beam – girder – or truss construction
Patent
1994-09-28
1996-02-20
Friedman, Carl D.
Static structures (e.g., buildings)
With component having discrete prestressing means
Beam, girder, or truss construction
522231, 5222311, 5223314, 52600, E04C 508
Patent
active
054919410
ABSTRACT:
A rebar splice joint embedded in a reinforced concrete structure and having improved seismic resistance is made between a first rebar with an internal thread and a second rebar element having a male thread between a stop shoulder and the end of the rebar. The bar length between the stop shoulder and the male threaded bar end is shorter than the length of the internal thread. The male thread is turned into the internal thread and the first rebar is torqued against the stop shoulder to near the elastic limit of the bars to elastically deform the male and female threads into more uniform contact along their opposing thread surfaces thereby increasing contact area between the threads to reduce or eliminate relative axial movement between the rebars under cyclic axial loading, such as seismic loading.
REFERENCES:
patent: Re23074 (1949-01-01), Henderson
patent: 2210553 (1940-08-01), Miller
patent: 2917901 (1959-12-01), Lackner
patent: 3232638 (1966-02-01), Hollander
patent: 3295286 (1967-01-01), Schaich
patent: 3440922 (1969-04-01), Cohen
patent: 4179142 (1979-12-01), Schopp
Edwards W. Glenn
Friedman Carl D.
Richmond Screw Anchor Company
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