Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 17
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II - w"14
(a) Tension Side (b) Compression Side
Figure 4.7 - Failures of Bearing Wall Specimen in Monotonic Test
For the shear wall monotonic test, the vertical chord tracks were not lift up in the tension
side thanks to the assistance of hold-downs. Local buckling in the vertical chord tracks in the
compression side was observed right above the hold-down area. This failure was not observed in
Mahdavian's (2016) research, where no gravity loads were applied on the shear wall. The reason
that caused the new failure could be that the hold-downs obstructed the lateral movement of
vertical chord tracks at the lower part, while the vertical chord tracks at the upper part was free to
move laterally. So, the second-order effects would be acted on the vertical chord tracks, this was
proved by the local twisting of the vertical chord studs shown in Figure 9. The new failure proved
that having gravity loads in the shear test can more realistic reflect the actual behaviors of the wall.
Other failures were screws pull-out on the bottom corrugated steel sheet, middle vertical track
local buckling. A tension field observed on the bottom sheet. The test was stopped at 7.5% story
drift, the shear wall could carry the gravity load without collapse during the whole loading process.
The failures of the shear wall specimen in monotonic test are shown in Figure 4.8.
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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/m1/25/: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .