Respacing floors

[Roly]

Shifted to design.....hopin for a response.

If respacing structural floors (with keel bolts) within minimiums and maximums (centers) laid down by the designer, does the minimum center's (max number of floors) dictate the total xsectional area required by the floors? That is if if you increase the centres and decrease the number of floors you must proportionally increase the xsectional dimensions of each member?
Apologies for the 20 questions, but I am trying to get my head around the essentials here.
Is the xsectional area a constant?

[Thunderhead19]

No, it isn't.

[Roly]

Duh! ....not thinking clearly.
Of course, it would be more dependent on the size of the moulding.
So the greater the moulding dimension of the floor, the larger the centres can be and less floors because of the larger bending moment of each floor?
(For an approriate minimum siding.) Xsection would be for shear only.......am I correct?

Also, is it standard practise to add on to the sided dimension of a floor the diameter of any bolts through it reducing that siding?