A closed thin-walled tube has thickness, 𝑡, mean enclosed area within the boundary of the centerline of tube’s thickness, 𝐴𝑚, and shear stress, 𝜏. Torsional moment of resistance

Q. A closed thin-walled tube has thickness, 𝑡, mean enclosed area within the boundary of the centerline of tube’s thickness, 𝐴_𝑚, and shear stress, 𝜏. Torsional moment of resistance, T, of the section would be

(A) 0.5𝜏𝐴_𝑚𝑡

(B) 𝜏𝐴_𝑚𝑡

(C) 2𝜏𝐴_𝑚𝑡

(D) 4𝜏𝐴_𝑚𝑡

Ans:

τt=T/2A_m
⇒T=2A_mτt