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Polymers 2015, 7(8), 1564-1576; doi:10.3390/polym7081470

Study on the Mechanical Properties of Stay Cable HDPE Sheathing Fatigue in Dynamic Bridge Environments

1,* , 2,†
,
2,†
and
2
1
Department of Bridge Engineering, Tongji University, Rm.711, Bridge building, 1239#, Siping Rd., Shanghai 200092, China
2
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Rm.719, Bridge building, 1239#, Siping Rd., Shanghai 200092, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 15 April 2015 / Revised: 6 August 2015 / Accepted: 10 August 2015 / Published: 20 August 2015
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Abstract

As the main force-bearing component of a cable-stayed bridge, a durable stay cable is paramount to the safety and durability of the entire bridge. High-density polyethylene (HDPE) sheathing is the main protective component of a stay cable and is the key to insuring cable durability. To address the issue of HDPE sheathing fracture on service, strain level data for in-service, HDPE bridge cable sheathing was used in this study as the basis for HDPE material aging and fatigue testing. A fatigue yield phenomenon with a yield platform on the hysteresis curve of the fatigue cycles is observed by the fatigue test. The parameters to describe this phenomenon are proposed and defined in this paper. A preliminary examination of the relationship between these parameters and the factors, such as the number of cycles, the strain amplitude, and strain rate, are presented. Based on the results obtained, it is suggested that the condition of fatigue yield of HDPE sheathing be defined as the fatigue durability limit state for the purposes of durability design, assessment, and protection of cable-stayed bridges. View Full-Text
Keywords: stay cable; HDPE; cable sheathing; fatigue testing; durability stay cable; HDPE; cable sheathing; fatigue testing; durability
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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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MDPI and ACS Style

Dan, D.; Sun, L.; Guo, Y.; Cheng, W. Study on the Mechanical Properties of Stay Cable HDPE Sheathing Fatigue in Dynamic Bridge Environments. Polymers 2015, 7, 1564-1576.

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