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Re: Rigid frame deflections (again)

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The stiffness of a frame is a function of several items including the

1) The height of the columns
2) The I of the columns
3) The length of the girders
4) The I of the girders
5) The fixity of the supports
6) The fixity of the joints

The formulae you are using incorporate items 1 to 5 above. As such, the
stiffness calculations will yield results depending on your choice of members
and connections. If your columns and girders for the wider frame are the same
size as the ones for the narrower frame, then you will have a smaller
drift/stiffer frame with the narrower one, due to length of the girders

Mostafa Oloumi