The results of an investigation to determine the static strength and creep behavior at elevated temperatures of seven nominally identical multiweb box beams made of 24S-T3 aluminum alloy are presented. The methods that were used to predict failure stresses in the static-strength tests were in good agreement with the experimental results. Creep deflections and creep lifetimes are presented for beams subjected to constant loads and to various heating conditions. Lifetime is sat-isfactorily predicted from material stress-rupture data when tensile failure occurs at both constant or varying temperatures.
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