RCC Structures Design
Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory

None of these
(wx/wy) = (ly/lx)⁴
(wx/wy) = (ly/lx)²
(wx/wy) = (ly/lx)

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RCC Structures Design
For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm
Overall depth of the slab shall not exceed four times the breadth of the rib
All listed here
Width of the rib shall not be less than 7.5 cm

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