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Conform Metal Deck

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CardsFan1

Structural
Joined
Mar 6, 2018
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I am looking at the Vulcraft catalog for Conform Metal Deck. The table states ( N=9 Normal Weight Concrete (145 PCF) What is N=9 ?
 
It's the ratio between the Modulus of Elasticity of steel (29,000,000 psi) to the Modulus of Elasticity of Concrete (~3,400,000 psi). It's normally rounded to an even number.
 
Or Bicycle?

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