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Polymers 2018, 10(2), 169; https://doi.org/10.3390/polym10020169

Fatigue and Durability of Laminated Carbon Fibre Reinforced Polymer Straps for Bridge Suspenders

1
Mechanical Systems Engineering Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
2
Department of Materials, ETH Zuerich, 8093 Zuerich, Switzerland
3
Institute for Infrastructure and Environment, School of Engineering, The University of Edinburgh, Edinburgh EH9 3FG, UK
4
Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland
*
Author to whom correspondence should be addressed.
Received: 15 December 2017 / Revised: 31 January 2018 / Accepted: 7 February 2018 / Published: 10 February 2018
(This article belongs to the Special Issue Selected Papers from "SMAR 2017")
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Abstract

Steel cables and suspenders in bridges are at high risk of corrosion-fatigue and in some cases of fretting-fatigue in their anchorages. These factors greatly limit the service stresses of a specific cable system and involve expensive protection measures. In order to investigate the above limitations, the fretting fatigue behaviour of pin-loaded carbon fibre reinforced polymer (CFRP) straps was studied as models for corrosion-resistant bridge suspenders. Two types of straps were tested: small model straps with a sacrificial CFRP ply and large full-scale straps. In a first phase, five fully laminated and carbon pin-loaded CFRP model straps were subjected to an ultimate tensile strength test. Thereafter, and in order to assess their durability, 20 model straps were subjected to a fretting fatigue test, which was successfully passed by 4 straps. An S-N curve was generated for a load ratio of 0.1 and a frequency of 10 Hz. In a second phase, one full-scale strap was tested for its ultimate tensile strength and two full-scale straps were fatigue-tested. The influence of fretting fatigue loading on the residual mechanical properties of the straps was also assessed, and although fretting fatigue represented an important limitation for laminated CFRP straps, it could be shown that the investigated CFRP tension members can compete with the well-established steel suspenders. View Full-Text
Keywords: carbon fibre reinforced polymer; CFRP; fatigue; tensile elements; bridge suspenders carbon fibre reinforced polymer; CFRP; fatigue; tensile elements; bridge suspenders
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Baschnagel, F.; Härdi, R.; Triantafyllidis, Z.; Meier, U.; Terrasi, G.P. Fatigue and Durability of Laminated Carbon Fibre Reinforced Polymer Straps for Bridge Suspenders. Polymers 2018, 10, 169.

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