What is the suggested slenderness ratio for simply supported RCC decks?

What is the suggested slenderness ratio for simply supported RCC decks? Correct Answer 12 to 15

The height, thickness and spacing of buttresses can be controlled by Slenderness ratio. Slenderness ratio is the ratio of the height of the buttress to the thickness of the buttress. The value usually ranges from 12 to 15.

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What is suggested massiveness factor for simply supported RCC Decks?
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where $$\delta {\text{S}}$$ = Static deflection of simply supported shaft due to uniformly distributed load)
The natural frequency of free transverse vibrations due to a point load acting over a simply supported shaft is equal to (where $$\delta $$ = Static deflection of a simply supported shaft due to the point load)