RCC— Important Topics, Formulas & MCQs
Reinforced Cement Concrete (RCC) design is a core technical subject for AE/JE Civil. It covers the behaviour and design of concrete members reinforced with steel, governed largely by IS 456:2000 using the Limit State Method. Expect questions on design constants, development length, and detailing.
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Important topics in RCC
Key concepts & formulas — RCC
Development length
Ld = φσs/(4τbd). For deformed bars increase τbd by 60%; for compression by 25%.
Limit State partial factors
Load factor 1.5 (DL+LL); material factors 1.5 (concrete), 1.15 (steel) → 0.45fck and 0.87fy.
Modular ratio (WSM)
m = 280/(3·σcbc). Used to locate the neutral axis of a cracked section.
Minimum & maximum steel
Beams: Ast,min = 0.85bd/fy; Ast,max = 0.04bD. Critical for short detailing MCQs.
5–8 questions in AE-level papers and a dedicated IS 456 series on ScoreCardAI. Code-based, so answers are precise and scorable.
Memorise the IS 456 constants (0.36, 0.42, 0.87fy, Ld factors) — most RCC MCQs are direct applications of them.
Sample RCC MCQ
For M30 concrete and Fe 500 deformed bars, the development length in tension is approximately (design bond stress for plain bars = 1.5 MPa):