Creep Deflections in Slab Buildings and Forces in Shores during Construction

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Title: Creep Deflections in Slab Buildings and Forces in Shores during Construction

Author(s): D. E. Berner, M. Polivka, B. C. Getwick, Jr., and D. Pirtz

Publication: Journal Proceedings

Volume: 83

Issue: 5

Appears on pages(s): 727-736

Keywords: concrete slabs; cyclic loads; cryogenics; earthquake resistant structural fatigue (materials); liquefied gases; lightweight concretes; low temperature marine atmospheres; offshore structures; prestressed concrete; reinforced concrete; thermal stresses.

Date: 9/1/1986

Abstract:
Safety and serviceability are key considerations for selecting concrete over other materials for use in containing such cryogenic liquids as liquefied petroleum gas and liquefied natural gas. This paper describes the response of reinforced and prestressed lightweight concrete subjected to high-intensity, low-frequency, cyclic axial tension/compression together with simultaneous cryogenic thermal shock, as would be encountered by an offshore containment structure during storm-wave loading, or a land-based containment structure during earthquake loading, accompanied by a limited release of cryogenic liquid. Three 290 by 64 by 15 cm (114 by 25 by 6 in.) lightweight concrete slabs were tested; two were prestressed and reinforced, and one was conventionally reinforced. The prestressed concrete slabs remained sound and essentially crack-free with only a small reduction in stiffness after being subjected to cryogenic thermal shock and high-inten-sity cyclic loading. The conventionally reinforced concrete slab also performed well, but could not sustain significant axial tension and consequently was subjected to test conditions that were less severe than those imposed on the prestressed concrete slab. Measurements taken during the cryogenic thermal shock indicated that low temperatures did not extend very far from the shocked zone into the surrounding slab, which implies that the thermal effects from a limited cryogenic spill would be localized in the neighborhood of the spill. These tests demonstrate the excellent behavior of prestressed lightweight concrete when subjected to a limited number of cryogenic thermal shocks and simultaneous high-intensity cyclic loading.