The 'waffle slab' (grid slab) is most suitable for:
Choose the correct answer
Short spans with heavy point loads
Large column-free spans (10–20 m) — reduces dead weight while maintaining depth; coffered ceiling is aesthetically pleasing
Only retaining wall construction
Only hydraulic structures
Correct Answer
B. Large column-free spans (10–20 m) — reduces dead weight while maintaining depth; coffered ceiling is aesthetically pleasing
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Waffle slab: two-way ribbed slab — hollow moulds (domes) create voids below, leaving ribs in two directions + solid top slab. Benefits: (1) Reduced dead weight (voids remove unnecessary concrete); (2) High structural depth (deep ribs → large I); (3) Aesthetic coffered ceiling. Economical for: large column-free spans (10–20 m), auditoriums, parking garages. Solid band beams at columns: punching shear region. Not suitable for very heavy live loads (prefer flat slab with drop panels).
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