Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 43
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5.9.3 Results of Incremental Dynamic Analysis
The median collapse intensity, ScT, is defined as the ground motion intensity where half of
the ground motions in the record set cause collapse of an index archetype model. The ratio between
the median collapse intensity (ScT) and the MCE intensity (SMT) is the CMR. CMR is the primary
parameter used to evaluate the collapse safety of the building design. The tests showed that the
sheet-in shear wall could reach 7.5% drift without collapse. FEMA P695 (2009) adopted 7% as
the collapse drift limit for the light-framed wood shear wall system. Since the building codes (IBC
2015, ASCE7 2016) consider the light framed wood and steel shear wall systems to have the same
seismic performance, the authors conservatively chose 7% as the drift limit for the sheet-in shear
wall system in incremental dynamic analysis.
The IDA results are plotted in terms of the spectral intensity of the ground motion versus
maximum story drift ratio recorded in the analysis. Figure 5.7(a) shows the 2-story office building
IDA results in the long direction, each line in the Figure 5.7 represented a given ground motion
scaled to increasing spectral intensity. From Figure 5.7(a), the ScT is 2.42 (g), and the SMT is 1.39
Another expression of IDA result is the fragility curve. Fragility curve can be defined
through a cumulative distribution function, which relates the ground motion intensity to the
probability of collapse. (Ibarra et al., 2002). Figure 20-b shows fragility curve of the 2-story office
building analysis in the long direction by fitting a lognormal distribution through the collapse data
points from Figure 5.7(a). In Figure 5.7(b), the ScT corresponds the 50% collapse probability of
the index archetype at the ground motion intensity ScT. CMR can be calculated as:
CMR = = 1.741
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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/m1/51/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .