Sempre tratto da FEMA P-750 = NEHRP 2009
Given a set of appropriate ground motions, there are an infinite number of scaling factors that may be applied to the
individual motions to meet the requirements of Sections 16.1.3.1 and 16.1.3.2. Thus, two analysts, working with the same set
of ground motions, are likely to produce a different set of scale factors. While this difference in scaling would have little
impact in linear analysis, it may lead to vastly different results in nonlinear analysis. For this reason, the process of selection
and scaling of ground motions should be included in the design review (Section 16.2.5 of the standard) that is required
wherever nonlinear response history analysis is used.
