Abstract
Unlike conventional steel strands, the smart strand supports strain-measuring function and adopts different materials for its core wire and helical wires. This study intends to analytically derive the nonlinear stress-strain model of this strand made of two materials. The effect of the bending moment and torsional moment of the helical wires on the overall load within the range of geometric shapes shown by actually used strands is verified to be negligible and is thus ignored in order to simplify the analytical model. Moreover, the slight difference between the actual and analytic behaviors, which only appears in the slope varying part in the case of bilinear behavior, such as that of steel, is also ignored. The proposed constitutive model of the smart strand obtained by introducing the experimental stress-strain relation between the carbon fiber reinforced polymer core wire and the helical steel wires is in good agreement with the experimental data. The previous analytical models are applicable only to strands made of a unique linear material, whereas the model proposed in this study is also applicable to strands in which the core wire and the helical wires are made of two different materials, exhibiting nonlinear behavior.
Highlights
Second Term Third Term Fourth TermLet us see the effect of the rotation of the strand on each term of Equation (22)
All of these studies concerned strands in which the core wire and helical wires are made of steel, and they are not applicable in the case of a core wire and helical wires made of different materials
The present study intends to analytically derive the load-strain relationship of strands in which the core wire and helical wires are made of different materials, as is the case for the smart strand
Summary
Let us see the effect of the rotation of the strand on each term of Equation (22).
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