Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 46
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6. Evaluate the system overstrength factor, Klo.
7. Evaluate the displacement amplification factor, Cd.
If the evaluation of ACMR finds trial values of seismic performance factors were
unacceptable, then the system should be redefined and reanalyzed, then re-evaluated by repeating
performance evaluation process.
Here, the 2-story office building was used as an example again to demonstrate the
individual index archetype performance evaluation before performing the group of index
archetypes performance evaluation.
At this point, Step 1 has been completed. However, the CMR computed above did not
account for the unique spectral shape (frequency content) of rare ground motions. To account for
the effects of spectral shape, the CMR is adjusted to obtain an adjusted collapse margin ratio,
ACMR, for each index archetype.
ACMR = SSF x CMR
Spectral shape factors, SSF, are a function of the fundamental period, T, the period-based
ductility, IT , and the applicable Seismic Design Category. The SSF is calculated by the
interpolation method from Table 6.1.
ACMR is calculated as:
ACMR = SSF x CMR = 1.12 x 1.74 = 1.95
Table 6.1 - Spectral Shape Factor (SSF) for Archetypes Designed using SDC Dmax
T (s) Period-Based Ductility,
1 1.1 1.5 2 3 4 6
<0.5 1 1.05 1.1 1.13 1.18 1.22 1.28
0.6 1 1.05 1.11 1.14 1.2 1.24 1.3
0.7 1 1.06 1.11 1.15 1.21 1.25 1.32
0.8 1 1.06 1.12 1.16 1.22 1.27 1.35
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Lan, Xing. Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets, thesis, August 2017; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1011859/m1/54/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .