Civil Engineering MCQAE Level Civil Engineering

A rectangular RCC beam has b=300 mm, effective depth=400 mm and tension steel=1.0% of bd. Steel area is

RCCOriginal practiceMEDIUM

Choose the correct answer

A

2400 mm²

B

1200 mm²

C

120000 mm²

D

600 mm²

Correct Answer

B. 1200 mm²

Why is this the answer?

Tensile reinforcement area Ast = (pt / 100) * b * d, where pt = steel percentage (%), b = beam width (mm), d = effective depth (mm). IS 456 limits: minimum pt = 0.85*100/fy (for beams); maximum pt = 4% for beams. Ast governs moment capacity and must satisfy both strength and serviceability requirements. Ast = 1.0/100 × b × d = 1200 mm².

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