Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 51
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If the trial value of response modification coefficient, R, was acceptable, it is required that
for each index archetype and each performance group meet the following two criteria:
Individual values of adjusted collapse margin ratio for each index archetype within a
performance group exceeds ACMR20%:
ACMRI > ACMR20%
The average value of adjusted collapse margin ratio for each performance group exceeds
ACMRI > ACMR10%
The average value of archetype overstrength, fl, is calculated for each performance group.
Then, the value of the system overstrength factor, fo, for use in design should not be taken as less
than the largest average value of calculated archetype overstrength f, from any performance group.
The deflection amplification factor, Cd, is based on the acceptable value of the response
modification factor, R, reduced by the damping factor, BI, corresponding to the inherent damping
of the system of interest.
Where B1 is the numerical damping coefficient given in Table 18.6-1 of ASCE 7-10 (2016).
However, the inherent damping of the newly proposed CFS framed building system with
sheet-in shear wall needs to be verified by future investigations. According to the test results by
Shafer (2015), the measured damping of the CFS framed building using wood sheathed shear walls
varied from 4% to 9%. The author adopted 5% inherent damping in this research, which was
believed to be appropriate. As a result, the damping coefficient, B1 equals to 1.0. So, Cd would be
equal to R.
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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/m1/59/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .