Question Statement:
The stiffened cross-section of a long slender uniform structural member is idealized as shown in the figure below. The lumped areas at $A, B, C$ and $D$ have equal cross-sectional area of $3\text{ cm}^2$. The webs $AB, BC, CD$ and $DA$ are each $5\text{ mm}$ thick. The structural member is subjected to a twisting moment of $10\text{ kNm}$. The magnitudes of the shear flow in the webs, $q_{AB}, q_{BC}, q_{CD},$ and $q_{DA}$ in $\text{kN/m}$ are, respectively:
Options:
- (A) 20, 20, 20, 20
- (B) 0, 0, 50, 50
- (C) 40, 40, 0, 0
- (D) 50, 50, 50, 50