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I have a frame, it consists of steel beams and my flooring is a composite deck. It consists of composite beams that are hinged to my steel frame beams. Composite beams do not transfer moments. Now, when I design with Etab, it gives me the error $lb/ry = 0.086*e/fy$ on my External frame beams. To solve this, I hold my frame beam from 3 different points.

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As seen in the figure. First of all, why doesn't the program calculate external frame beams as composite beams? It calculates them as steel beams. My other question is: If you pay attention, we do not hold the composite beams anywhere against buckling. (lb/ry does not comply with the 0.086*e/fy rule) However, this is not an error for the program. Is this because the composite beams are connected hinged (moment transferring)?

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