Per the Aluminum Design Manual (ADM) 2015, the allowable bending stress of round tubes shall be determined for the limit states of yielding, rupture, and local buckling:
- that given by section F.6.1 (compressive yielding), or
- that given by section F.6.1 (tensile yielding), or
- that given by section F.6.1 (tensile rupture), or
- that given by section F.6.2 (upper inelastic buckling), or
- that given by section F.6.2 (lower inelastic buckling), or
- that given by section F.6.2 (elastic buckling)
Basically, the allowable bending stress is either the allowable tensile stress of the tension side of member (#2), the allowable compressive stress of the compressive side of the member considered as a whole (#1), or the allowable compressive stress of the member as governed by its individual elements (flange & webs) due to local buckling (#4, #5, and #6).
The allowable compressive stress of a member works in a similar way, but based on sections E.3 and E.4 for limit states of member buckling and local buckling, respectively.
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Last Update: February 19, 2022
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