Experimental results are presented for the pure-bending strength of 53 multiweb beams of various proportions. The beams were fabricated from 75S-T6 aluminum-alloy sheet material and had channel-type webs which had been cold formed with bend radii of four times the web thickness. Local and wrinkling modes of buckling were observed prior to failure. All failures occurred with the formation of a trough in the compression skin extending across the web attachment flanges. The stress levels achieved at buckling and failure are discussed in terms of existing theory. Based upon the failure stresses, design charts are presented which permit rapid selection of the most efficient proportions for given values of an appro-priate structural index.
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