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Collector Elements

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When you have a collector element which is a composite beam, what is the recommended procedure for combining normal bending stresses in the composite beam with  those produced by the collector (axial plus flexural to do the axial load acting at the steel beam top flange with an eccentricity of 1/2 beam depth). Should the collector force be applied to the non-composite beam section or to the composite beam section? If using the composite section for the collector force, should extra rebar be added over the beam to handle the tensile collector forces or let the steel beam carry it all? How should the stresses be combined? 

Jim K.

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