The IS 800 serviceability limit state for deflection of beams (L/250) is checked under:
Choose the correct answer
Factored loads (1.5DL + 1.5LL)
Unfactored service loads (characteristic DL + LL) — deflection must not impair appearance or function
Only dead load
Wind load only
Correct Answer
B. Unfactored service loads (characteristic DL + LL) — deflection must not impair appearance or function
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IS 800 Cl. 5.6.1: Deflection limits are checked under serviceability loads (unfactored service loads = DL + LL without partial safety factors). Δ_max = L/300 for beams supporting plaster (to prevent cracks); L/325 for cantilevers; L/240 for floors generally. These are service-level limits to ensure occupant comfort and protection of non-structural elements. Ultimate limit states use factored loads.
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