Influence Length of Wire Fracture and Wire-to-Wire Interaction in Helically Wired Strands under Axial Loads
Publication: Journal of Bridge Engineering
Volume 23, Issue 1
Abstract
In this study, the influence length of wire damage and wire-to-wire interaction in helically wired strands were investigated both experimentally and numerically. Greased seven-wire steel strands (2 long and 11 short specimens) were tested, each with one outer wire damaged locally. Prior to fracture, the difference in strains between the damaged and intact wires was negligible at 1.2 m (2 ft) away from the damage location. Sudden fracture in the outer wire with 90% area reduction caused only slight or negligible dynamic effect. The influence length (IL, in feet) of the wire fracture can be empirically determined from the applied load (T > 0.5 kips) by . Calibrated with test results, the interaction among greased wires can be simulated by isotropic Coulomb friction with a coefficient of friction of 0.005. In an intact strand, axial stress in the core wire was found to be approximately 1.5 times that in any outer wire. As a result of the nonaxisymmetric section at the location of fracture, axial stress increased significantly in the two outer wires in direct contact with the fractured wire and changed slightly in the remaining wires.
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Acknowledgments
Financial support for this study was provided in part by the U.S. National Science Foundation under Award No. CMMI-1538416 and by the Department of Civil, Architectural, and Environmental Engineering at Missouri University of Science and Technology.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 1 • January 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Dec 30, 2016
Accepted: Jul 17, 2017
Published online: Oct 23, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 23, 2018
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