Limiting moment coefficients such as 0.138 fckbd2 for Fe415 are derived from:

Why is this the answer?

These coefficients arise from stress block parameters and limiting neutral-axis ratios. Reference: Clause 38.1 / Annex G | Page: verify from your official BIS copy/PDF pagination Last-Minute Revision Checklist Memorise durability exposure classes and cover values: mild 20 mm, moderate 30 mm, severe 45 mm, very severe 50 mm, extreme 75 mm. Memorise LSM factors: concrete 1.5, steel 1.15, design steel stress 0.87fy. Memorise load combinations: 1.5(DL+LL), 1.2(DL+LL+WL/EL), 1.5(DL+WL/EL), 0.9DL+1.5W

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