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Dumb Question Re Bridge Slab Analysis

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I'm trying to do a "grillage analysis" of a concrete bridge deck on bulb-tee
girders.

These girders have, of course, very wide flanges.  I suppose this could
actually affect the stiffness of the system in the transverse direction,
since the effect of the flange bending probably should be included. Or
should it? Seems like a dumb question, but I can be persuaded either way.

I'd like some opinions.

Thanks.