strength of non-compact hss

huangyhg

strength of non-compact hss
what is the formula for reducing the strength of non-compact hss?
lrfd, pg4-8 gives the formula
phi.b mn = phi.b mp - phi.b(mp-mr)[(lb-lp)/(lr-lp)].
but the section says that this is for i or c rolled shapes only.
lrfd, app. f, pg 6-11 gives (substituting l for lambda)
mn = cb[mp - (mp-mr)[(l-lp)/(lr-lp)]
can i use the second formula for any shape?
imagineer



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found the answer to my own question in the hss connections manual.  the second equation is repeated as eqn 5.1-5.  missed it the first time because i stopped reading at "for lambda<lampda.p ..."
that'll teach me.  read the entire paragraph!
imagineer