Vol. 19, No. 1, pp. 17-22 (2023)
ULTIMATE STRENGTH, DUCTILITY, AND FAILURE MODE OF
HIGH-STRENGTH FRICTIONAL BOLTED JOINTS MADE OF
HIGH-STRENGTH STEEL
Zi-Ce Qin 1, H. Moriyama 2, *, T. Yamaguchi 3, M. Shigeishi 4, Yu-Yue Xing 1 and A. Hashimoto 5
1 Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan
2 Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima, Japan
3 Department of Civil Engineering, Osaka Metropolitan University, Osaka, Japan
4 Department of Civil and Architectural Engineering, Kumamoto University, Kumamoto, Japan
5 Technical Division, Faculty of Engineering, Kumamoto University, Kumamoto, Japan
* (Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 20 July 2022; Revised: 22 August 2022; Accepted: 10 January 2023
DOI:10.18057/IJASC.2023.19.1.3
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ABSTRACT
Further structural rationalization of steel bridges such as weight reduction of members can be realized by using high-strength steel. However, owing to the high yield-to-tensile strength ratio, failure of connected members occurs before the members in the gross area are plastic-deformed sufficiently. In this study, tensile tests of frictional bolted joints with various geometrical configurations and grades of plates and bolts were conducted to compare the failure modes of high-strength and mild steel joints and to investigate the relationship among ultimate strength, ductility, and failure mode. The results indicate that the failure modes of high-strength steel joints were the same as those of mild steel joints and can be almost classified with the respective ratios of net cross-section failure resistance and plate shear failure resistance to bolt shear failure resistance. Ultimate resistance and ductility were maximum in the case of split failure mode where these ratios were approximately 1.0; they increased as the ratios decreased. Therefore, it can be concluded that these ratios should be less than 1.0 to induce the split failure mode to enable the breaking of a high-strength steel joint after the member is plastic-deformed sufficiently.
KEYWORDS
High strength steel, High-strength frictional bolted joints, Ultimate strength, Ductility, Failure modes
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