ACI Plain Concrete Sm help
ACI Plain Concrete Sm help
(OP)
Is anyone familiar with finding the "elastic section modulus" called Sm noted in ACI 318-05 in the plain concrete section, chapter 22? I can find no specific calculation for it; would I assume a regular S section modulus?





RE: ACI Plain Concrete Sm help
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RE: ACI Plain Concrete Sm help
RE: ACI Plain Concrete Sm help
RE: ACI Plain Concrete Sm help
RE: ACI Plain Concrete Sm help
For the bending of plain concrete, the authors use 5 root f'c for modulus of rupture with a strength reduction factor of 0.65.
Section modulus is still bh^2/6 and I = bh^3/12.
So Phi Mn = phi*f*I/(h/2) where f = 5 root f'c
Compare Mu to phi Mn like you would normally do.
RE: ACI Plain Concrete Sm help