A doubly reinforced beam has compression steel because:
Choose the correct answer
It is always required in all beams
When moment exceeds the limiting moment of singly reinforced section or depth is restricted
Steel is cheaper than concrete
For aesthetic reasons
Correct Answer
B. When moment exceeds the limiting moment of singly reinforced section or depth is restricted
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Doubly reinforced beam: compression steel (Asc) is provided when: (1) depth is restricted and Mu > Mu,lim (limiting moment) of singly reinforced section; (2) beam subjected to reversal of moments; (3) long-term reduction of creep and shrinkage deflection. Compression steel increases moment capacity beyond the singly reinforced limit.
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