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Civil Engineering QUESTION #6629
Question 1
A doubly reinforced beam is used when:
  • The section dimensions are restricted and $M_u > M_{u,lim}$✔️
  • The beam is very long to prevent deflection
  • Shear reinforcement is not sufficient
  • Torsion is the dominant force
Correct Answer Explanation
Doubly reinforced beams (adding compression steel) are used when architectural or clearance requirements limit the beam size such that a singly reinforced section cannot provide enough capacity without becoming over-reinforced.