I’m doing stuff I should done in school J
1) I am reviewing how to quickly arrive at sway in a rectangular (or any, for that matter) portal using simple portal frame equations.
2) I calculate the moments from the std equations and then release the top corners to arrive at a flagpole concept tied at tops by a strut/beam.
3) The resulting base moments are approx by iterative moment distribution.
4) If I use a partial, or offset, load on the beam I expect sway.
5) My question is, “Is it too simplistic to take the resulting moment difference at the bases and apply slope-deflection arithmetic to arrive at an estimate of the sway?”
Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE
Victoria, BC, V8T 1Z1