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rigid diaphragm chord forces?

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in flexible diaphragm design, i can see the deep beam analogy and the
resulting chord forces

however, in rigid diaphragm design, i thought the whole point was that the
diaphragm (concrete slab over metal deck) was assumed rigid, has a center of
mass, has a center of rigidity and is controlled by rotation.  this rotation
transmits forces to the lateral resisting elements below based on their
relative rigidities in shear only.

have i missed the point here?  if i did can you provide a design reference /
document that shows how rigid diaphragms develop chord forces?

tia
da


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