The 'cracked transformed section' analysis for RC beams is used to find:
Choose the correct answer
Ultimate load capacity only
Service stress levels and crack width in RC beams (WSM) — NA found from cracked section transformed to equivalent concrete
Shear capacity of section
Column axial load
Correct Answer
B. Service stress levels and crack width in RC beams (WSM) — NA found from cracked section transformed to equivalent concrete
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Cracked transformed section (Working Stress Method): concrete in tension below NA is ignored; steel area replaced by equivalent concrete area (m×Ast where m = Es/Ec = modular ratio ≈ 280/(3σcbc)). Find NA depth x by equating moments of areas about NA. Then: actual stress in concrete (top fibre) and steel from bending formula. Used in WSM design and crack width calculations.
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