Part 1 – Problem 05: For inter-story drift ratio calculation for SAP users (since I believe ETABS has this already calculated), is there a location of preference to make these calculations? This question could also be reframed as reassurance that the diaphragm is still assumed to be flexible (and therefore not rigid nor semi-rigid as ASCE 7-16’s third drift calculation criterion dictates).

The best approximation may be to select the nodes at/closest to the Center of Gravity. This is one way of calculating the Center of Gravity:

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