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Z Factor in UBC94

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The Z factor (0.4 maximum) in UBC94 is "EFFECTIVE PEAK
ACCELERATION", which is different from the maximum
peak acceleration from either soil report or from some
acceleration contour map (such as 0.6 at certain area
in California per Algermissen and Perkins, 1976).

This is the decision by the seismic design
recommendations committee based in part on scientific
knowledge and in part on judgment and compromise, as
discussed in ATC 3-06 (Applied Technology Council,
1978, p. 300)

James Lin
IDS, Inc.




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