The neutral axis depth in a flanged (T-section) beam, when it lies within the flange, is found using:
Choose the correct answer
Web area only (ignoring flange)
Treating flange as rectangular section of width bf and checking if xu ≤ Df (flange thickness)
Full T-section area regardless of NA position
Using the web width bw in all cases
Correct Answer
B. Treating flange as rectangular section of width bf and checking if xu ≤ Df (flange thickness)
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If NA in flange (xu ≤ Df): treat as rectangular beam of width bf (flange width) and depth d. Check: 0.36fck × bf × xu = 0.87fy × Ast. Solve for xu. If xu > Df, the NA is in the web — use flanged section formula. Most lightly reinforced T-beams have NA within the flange.
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