"It [Notional Loads] accounts for partial yielding and the effect of initial imperfections in the columns." "Second, because it [Notional Loads] accounts for the p-delta moments directly, the use of effective length factors greater than one are obviated and its use allows effective lengths equal to actual lengths to be used."
Straight from Pg. 2-19 from CAN/CSA-S16-01 (Eight Edition)
So, if I were to apply a lateral load equal to 0.005 x gravity load which is what the notional load is, I can get away with not performing a p-delta analysis AND using effective length factors of one? Why the hoopla about Direct Analysis Method then?
"If a builder has built a house for a man and has not made his work sound, and the house which he has built has fallen down and so caused the death of the householder, that builder shall be put to death." Code of Hammurabi, c.2040 B.C.