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RE: Seismic Design Manual - Vol. 2.

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Is there some special approach to get "da" values in the Table 1-6 "Determine tiedown assembly displacements for roof level shear wall"? (ref. page 37 of the SEAOC Seismic Design Manual, page 37.)

Why are some of the values in the last column (da), the sum of 3 columns left of it (Shink+Cursh+Slip) and some are not? In other words, where are the 0.38, 0.38, 0.38, 0.45 inches displacement coming from?

Thanks

Sam Chang, SE