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Diaphragm and wall deflections

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Does anyone know of a code limit of flexible diaphragm
deflections or of flexible diaphragm lengths?

Since the UBC Standards includes a method for calculating
diaphragm deflections, why is it that the deflection calculation
is not required by code for large diaphragms?

Also, in calculating maximum moments in tall slender walls
and tilt-ups, does anyone include the P-delta moment due to
the out of plane movement at the top of the wall from eccentric
dead loads due to diaphragm deflection?

Michael Francis