Seismic Performance Evaluation of Novel Cold-Formed Steel Framed Shear Walls Sheathed with Corrugated Steel Sheets Page: 33
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Figure 5.2 - Shear wall Numerical Model
Pinching effect is a load-deformation response and exhibits stiffness and strength
degradation under cyclic loading. To achieve the pinching effect, pinching4 uniaxial hysteretic
material was used for the diagonal truss elements. To obtain the backbone curve of pinching4
material, the load vs. displacement in the horizontal direction was first converted to the stress-
strain relationship in the truss elements according to the basic equilibrium and geometry.
The axial force in the diagonal truss element F can be expressed as:
F =V / (2cosO )
The stress and strain in the diagonal truss element are calculated as:
Where cos = b2+,2' and l = Vb2 + h2. Herein b and h are the width and height of the
shear wall respectively.
After the backbone curve is defined by 4 positive and 4 negative points, it is required to
input the parameters that can define the strength and stiffness degradation, as well as the pinching
effect under cyclic loading, as shown in Figure 5.3. The complete set of Pinching4 parameters,
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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/m1/41/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; .