By ACI Committee 376
This code offers minimal requisites for layout and building of strengthened concrete and prestressed concrete buildings for the garage and containment of refrigerated liquefied gases (RLG) with carrier temperatures among +40 and –325°F. the rules indexed herein are appropriate to concrete foundations of double-steel tanks topic to the approval of the landlord.
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Extra info for ACI 376-11 - Code Requirements for Design and Construction of Concrete Structures for the Containment of Refrigerated Liquefied Gases and Commentary
Where an elevated slab is used, the bearing capacity of piers supporting the tank base exposed to thermal radiation should also be checked. Reduction in strength of all materials exposed to elevated temperatures should be included in the design. 6—Concrete quality Concrete shall be a mixture of portland cement or any other hydraulic cement or supplementary cementing material, fine aggregate, coarse aggregate, and water, with or without admixtures. 1 Concrete used in structures governed by this code shall have a minimum specified 28-day compressive strength of 5000 psi when containing liquids and 4000 psi for other reinforced concrete.
1R. Creep in concrete decreases with decreasing temperature roughly in proportion to the decrease in elastic strain at low temperatures. Creep for normalweight concrete at –22oF is typically half that at ambient temperature (FIP 1981). Designing for creep and drying shrinkage at ambient temperature is typically a conservative approach. 5 of ACI 350. For concretes other than normalweight, lightweight, and heavyweight, the value of concrete elastic modulus for use in the design shall be that for ambient temperature determined in accordance with ASTM C469, except under conditions where underestimation of elastic modulus will adversely affect the design.
2 load factor for the OBE loading is consistent with ACI 350, Eq. (9-5), because it is assumed that the dead load will be combined with other operation loads such as settlement and live load. 9 load factor is consistent with ACI 350, Eq. (9-6) and (9-7), when the higher dead load reduces the effect of other loads. 9 when the higher dead load reduces the effect of other loads. 9 load factor is consistent with ACI 350, Eq. (9-6) and (9-7), when the higher dead load reduces the effect of other loads.