Question:

How SACS calculate the shear stress due to torsion for C-channel?

Answer:

b = d = 8 mm, a = 100 mm, c = 92 mm, D = 12.11 mm, α = 0.146, I1 = 16,203.89 mm4, I2 = 15,271.15 mm4

Ixx Angle = 34,609.64 mm4 → Ixx Channel = 69,219.28 mm4

D/2r = 0.757, A = 3,071.6 mm2, tanh(2Փ/π) = 1, C = 0.0222 1/mm

Гmax = 207.576 MPa

For more information, please refer to Roark's formulas for stress and strain - page 407.