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What is suggested massiveness factor for simply supported RCC Decks?

What is suggested massiveness factor for simply supported RCC Decks? Correct Answer 2.5 to 3

Massiveness factor and slenderness ratio both controls the height, thickness and the spacing of the buttress. The suggested slenderness ratio usually ranges from 12 to 15 and the massiveness factor varies from 2.5 to 3.

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