Tensile strengths of super high-strength steel strand wire ropes and wire rope open swaged socket connections at fire and post fire
Journal of Structural Fire Engineering
ISSN: 2040-2317
Article publication date: 5 June 2023
Issue publication date: 13 February 2024
Abstract
Purpose
The main purpose of this study was to evaluate the tensile strengths of JIS G3549 super high-strength steel strand wire ropes (1,570 MPa-class high-carbon steels) and wire rope open swaged socket connections at fire and post fire.
Design/methodology/approach
Steady-state tests from ambient temperature (20 °C) to 800 °C, transient-state tests under the allowable design tensile force and tensile tests in an ambient temperature environment after heating (heating temperatures of 200–800 °C) were conducted.
Findings
The tensile strengths of the wire rope and end-connection specimens at both fire and post fire were obtained. The steel wire rope specimens possessed larger reduction factors than general hot-rolled mild steels (JIS SS400) and high-strength steel bolts (JIS F10T). The end-connection specimens with sufficient socket lengths exhibited ductile fracture of the wire rope part at both fire and post fire; however, those with short socket lengths experienced a pull-out fracture at the socket.
Originality/value
The fundamental and important tensile test results of the super high-strength steel strand wire ropes (1,570 MPa-class high-carbon steels) and wire rope open swaged socket connections were accumulated at fire and post fire, and the fracture modes were clarified. The obtained test results contribute to fire resistance performance-based design of cable steel structures at fire and fire-damage investigations to consider their reusability post fire.
Keywords
Acknowledgements
The authors are thankful for the funding provided by the Grant-in-Aid for Scientific Research (B) of the Japan Society for the Promotion of Science (JSPS). They also acknowledge the excellent support provided by Kobelco Wire Company, Ltd. to manufacture all specimens, which helped in significantly improving this paper.
Citation
Yamaguchi, T. and Ozaki, F. (2024), "Tensile strengths of super high-strength steel strand wire ropes and wire rope open swaged socket connections at fire and post fire", Journal of Structural Fire Engineering, Vol. 15 No. 1, pp. 50-75. https://doi.org/10.1108/JSFE-01-2023-0013
Publisher
:Emerald Publishing Limited
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