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why steel frame beam automatically changed to composite beam

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donnabean

Structural
Joined
Dec 12, 2013
Messages
20
Location
CA
Hello all,

I am learning Etabs by building a fake small project model. I noticed that the steel frame beams all automatically changed to composite beams because the design procedure showed as composite beam after I applied roof steel deck, which no concrete on top at all.
Any input will be welcomed.

 
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