Torsional Constant
Torsional Constant
(OP)
I saw a thread on calculating the torsional constant, J (listed in table 1-25, page 1-89 of the AISC Manual) for shapes not listed in the manual. Although, it seemed like only how to evaluate torsion was explained. Does anyone know how to calculate this value. I need it only for equations F1-8 and F1-9 in the manual. I only need it to analyze the lateral torsional buckling limit state or an I-Beam. Does anyone know how i would calculate this? Thanks.
Dave
Dave





RE: Torsional Constant
J = Σ(bt3 / 3)
So for an I-beam
J = (2btf3 + (d - 2tf)tw3) / 3
where
b = flange width
tf = flange thickness
d = beam depth
tw = web thickness
RE: Torsional Constant
RE: Torsional Constant