STAAD.Pro is able to do a composite beam design as per AISC 9th edition code or as per LRFD 3rd edition code but this feature is not available for the AISC UNIFIED code as of now. This is something that will be available in future. So for now you may consider using CODE AISC or CODE LRFD as opposed to CODE AISC UNIFIED for designing these composite members. Non-composite sections can be designed per the CODE AISC UNIFIED
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