30 September 1999
than 25 percent of the transverse dimension of the wing, the structure can be considered to
have plan irregularity.
(9) Diaphragm discontinuities. Significant discontinuities in diaphragm strength or
stiffness. Examples include large openings that significantly reduce the strength and/or stiffness
of the diaphragm, particularly when the openings are adjacent to a vertical resisting element so
as to impair the effective transfer of shear to the element.
(10) SA, SB, SD, SE, and SF. These site characteristics pertain to the standardized soil
profiles described in Table B-2. Buildings on firm soil (i.e., SC) are assumed in the basic score
and a positive modifier is used for buildings on rock (SA, SB), and negative modifiers are used
for buildings founded on less favorable soil profiles (SD, SE, and SF).
f. Final score. The numerical total of the basic score and the applicable structural
modifiers is the primary structural parameter in the review process. Other parameters noted on
this form, (e.g., use, occupancy, and falling hazards) are also important in the assignment of
priority for evaluation and retrofit.
g. Comments/Conclusions. This part of the form should be used to record: 1) dates and a
brief description of any modifications and/or additions made to the structure; 2) poor condition of
the structure, if any; 3) obvious structural deficiencies, if any; 4) a brief explanation to support
chosen detail modifier; 5) a narrative explanation provided by the reviewer regarding any
discrepancies between the final structural score and the judgement of the reviewer that may
affect the outcome of the review results; and 6) any comments that the reviewer believes would
be useful for the evaluation process.