In order to amplify accidental torsion, as per UBC-97 and ASCE 7-05, maximum and average displacements at corners of floor plates must be compared.
However, in csi wikki, they use the word "DRIFT" not "DISPLACEMENT", so drifts should be compared instead of displacement.
Drift: Difference of displacements at a specific point of upper floor and lower floor
Displacement: Abs elastic or in-elastic displacement with reference to base
I went through ASCE 7-10 but it was more confusing, as in the text they use word "DRIFT" but in the formulas they talk about "DISPLACEMENT".
In FEMA examples, they are sometimes using "Inter-story drift" and sometimes "displacements".
Anything I am missing here?