RCC Structures Design
An under-reinforced section means

Steel will yield first
Steel provided on one face only
Steel provided is insufficient
Steel is provided at the underside only

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RCC Structures Design
Steel beam theory is used for

Design of simple steel beams
Doubly reinforced beams ignoring compressive stress in concrete
Steel beams encased in concrete
Beams if shear exceeds 4 times allowable shear stress

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