For singly symmetrical double tees, a My is required to establish landa_p, I am asking if this My -as normally would be considered be the case- needs be the moment at which the section first reaches yield, i.e., the lesser of Myc=|Sxc·Fy| or Myt=|Sxt·Fy|, be it in compressive or tensile stress, since improper consideration might render improper limiting slenderness parameter for compact element measure.
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