In a doubly reinforced beam (LSM, IS 456), the stress in the compression reinforcement (f'_s) is taken as:
Choose the correct answer
Equal to 0.87f_y always
Equal to 1.5m × f_sc
f_sc for strain compatibility, but limited to 0.87f_y for HYSD bars
Equal to f_ck
Correct Answer
C. f_sc for strain compatibility, but limited to 0.87f_y for HYSD bars
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The stress in compression steel is computed from strain compatibility (f'_s = E_s × ε'_s). For HYSD bars, f'_s is limited to 0.87f_y (yield stress design value). For the parabola-rectangle stress block, reference IS 456 Annex G.
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