Static structures (e.g. – buildings) – Relatively yieldable preformed separator – Separator inserted prior to or during pouring of two...
Patent
1996-08-28
1999-02-16
Kent, Christopher
Static structures (e.g., buildings)
Relatively yieldable preformed separator
Separator inserted prior to or during pouring of two...
52318, 525731, 404 60, 404 62, F04B 148, E01C 1114
Patent
active
058708693
ABSTRACT:
A yielding tie bar transfers load stress across a joint between adjacent concrete slabs, and accommodates internal movement of the slabs to reduce cracking. A combination of adjacent slabs have a cracking strength and comprise a plurality of such tie bars. A yieldable strip made of yieldable metal is welded to the bar and mounted near each end of the bar perpendicular to the bar axis. The strip has a predetermined yield strength (a) sufficient to restrain slab movement in a direction which opens the joint, and (b) yielding in the metal thereof to an extent that will prevent substantial cracking of the slabs. The bar is preferably rectangular and further comprises a resilient facing attached to at least one face to accommodate movement perpendicular to the facing. As preferred, the bar yield strength is sufficient to restrain slab movement at forces between the slabs below 80% of the slab cracking strength, and insufficient to restrain slab movement above at least 80% of the slab cracking strength. The strips are preferably made from a non ferrous metal or plastic resin.
REFERENCES:
patent: 2106095 (1938-01-01), Heltzel
patent: 2299670 (1942-10-01), Westcott
patent: 2605680 (1952-08-01), Yeoman
patent: 2858748 (1958-11-01), Crone
patent: 4449844 (1984-05-01), Larsen
patent: 4733513 (1988-03-01), Schrader et al.
patent: 4752153 (1988-06-01), Miller
Kang Timothy B.
Kent Christopher
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