Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 22
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4.5.3 Wall Properties Calculation
The results of each wall specimen under monotonic loading and cyclic loading are provided
respectively in Table 4.4. The results include the test peak load, lateral displacement at peak load,
initial stiffness as well as the ductility factor. Ductility factor was calculated using the equivalent
energy elastic plastic model (EEEP) according to AISI S213 (2012). The EEEP method was first
proposed by Park (1989), and was improved by Foliente (1996), Each Test details can be found
in Appendix A. The procedure for calculating ductility factor is that a backbone curve plotted first,
and then a bold line (shown in Figure 4.11) plotted to make the area of Al equal to the area of A2.
The equation of ductility factor calculation is y = Au/Ay.
4.5.4 Discussion of Test Results
A few of key points of the test results would be discussed in this section. There were the
effects of gravity loads on the structural performance of the wall, the lateral resistance contribution
of the sheet-in bearing wall, and the determination of collapse drift limit.
Firstly, the effects of gravity loads on the walls. For sheet-in bearing wall, gravity loads
would cause the bottom end of the vertical chord tracks local bucking; for sheet-in shear wall,
gravity loads would cause severe local buckling on the vertical chord studs right above the hold-
down area. But for the shear wall without gravity loads. Only minor buckling on the chord vertical
tracks. It is believed that due to the severe buckling happened on the sheet-in shear wall test with
gravity loads, the shear strength dropped 11.56% and initial stiffness dropped 7.72% compared to
sheet-in shear wall without gravity load, see the comparison in Table 4.5 and Figure 4.12. So,
gravity loads had negative effects on the structural performance of the sheet-in shear wall. In
Mahdavian's (2016) research, she did not do tests on sheet-in bearing wall. The only two tests she
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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/m1/30/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .