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Q: The breadth of a ribbed slab containing two bars must be between.
  • A. 6 cm to 7.5 cm
  • B. 8 cm to 10 cm
  • C. 10 cm to 12 cm
  • D. None of these
Correct Answer: Option B - Two-way ribbed slabs are sometimes called waffle slabs. It is used in large span construction. Ribbed slab is special type of 'grid floor' in which the 'slab' called topping is very thin. (50-100mm) and beams called ribs are very slender and closely spaced (less than 1.5m apart). The ribs have a thickness of not less than 65mm. The breath of ribbed slab containing two bars must be between 8cm to 10cm.
B. Two-way ribbed slabs are sometimes called waffle slabs. It is used in large span construction. Ribbed slab is special type of 'grid floor' in which the 'slab' called topping is very thin. (50-100mm) and beams called ribs are very slender and closely spaced (less than 1.5m apart). The ribs have a thickness of not less than 65mm. The breath of ribbed slab containing two bars must be between 8cm to 10cm.

Explanations:

Two-way ribbed slabs are sometimes called waffle slabs. It is used in large span construction. Ribbed slab is special type of 'grid floor' in which the 'slab' called topping is very thin. (50-100mm) and beams called ribs are very slender and closely spaced (less than 1.5m apart). The ribs have a thickness of not less than 65mm. The breath of ribbed slab containing two bars must be between 8cm to 10cm.