COMPOSITE DECK

Dear sir,

I designed a structure by using both method.in first method i deaigned it by composite beam method.and in second method i do it with composite deck.but by using composite beams giving lower utilization ratio than composite deck method.can you tell me the reason .As per my understading in in composite deck method it is not making the main beam as a composite beam.only secondary beams are composite in this case.Kindly advise what will be the best.should i change main beams only in composite beam in this case?both files are attached.2.

Thanking you,STORE.std2 WITH DECK.std2746.STORE.std2.std

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