Bending Behavior of Axially Preloaded Multilayered Spiral Strands
Publication: Journal of Engineering Mechanics
Volume 144, Issue 12
Abstract
This paper presents a new analytical formulation to predict the bending stiffness of multilayered spiral strands. The effect of interwire contact forces and slip between wires have been fully considered, with the emphasis on the fretting fatigue behavior over individual interwire/interlayer contact patches, where wire fractures have mostly been found to occur. After extensive theoretical parametric studies on a variety of strand constructions, it is shown that the overall effective bending stiffness varies from an upper bound (fully stuck, with no interwire/interlayer slippage) to a lower bound (full slip), with the difference between two limiting values depending on the assumed friction coefficient and cable geometry. Furthermore, wire lay angles in different layers of the strand are shown to play an important role in overall strand deformations and contact forces. To validate the theory developed in this paper, the theoretical predictions regarding contact forces, deformations, and bending stiffness are compared with the previously published, full-scale experimental data in the literature. In all cases, a very close agreement is found between theoretical predictions and full-scale experimental data for multilayered strands of 39-, 41-, and 164-mm-diameter, respectively.
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Acknowledgments
Authors are deeply thankful to the University of Engineering and Technology (UET) Peshawar, Pakistan, and Higher Education Commission (HEC) of Pakistan for financial support to the project. The research work was carried out at the School of Civil and Building Engineering, Loughborough University, UK, whose support is also sincerely appreciated. The findings and any opinion presented in this paper are those of the authors only and do not necessarily reflect the sponsors views.
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Published In
Journal of Engineering Mechanics
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 3, 2017
Accepted: Jun 12, 2018
Published online: Sep 25, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 25, 2019
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