A waffle (coffered) slab is used when:
Choose the correct answer
Heavy point loads are expected
The span is very short
Long spans with reduced self-weight are required
The slab is subjected to hydrostatic pressure
Correct Answer
C. Long spans with reduced self-weight are required
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Waffle slabs (ribbed in two directions with square coffers) are used for long spans where reducing self-weight is important. The ribbed form reduces dead load while maintaining structural depth and rigidity.
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