I have done a building, and I need to design expansion joints around some CMU shafts to avoid loading them. When I do the Results - Drift sheet, I see I am given displacements and drifts. When I am designing this expansion joint, which number do I take and multiply by Cd to get my amplified deflection. The story drift is much less than the displacement. My assumption is the drift is relative to the floor below, while the displacement is relative to base elevation? By that, I think I need to use the displacement as the expansion joint size.
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