Fatigue Performance of Bird-Beak SHS Gap K-Joints under Brace In-Plane Force
Publication: Journal of Structural Engineering
Volume 147, Issue 11
Abstract
This paper presents a test campaign concerning the fatigue behavior of the bird-beak square hollow section (SHS) gap K-joints subjected to brace in-plane force. A total of four bird-beak SHS gap K-joint specimens were tested. Prior to the high-cycle fatigue tests, static in-plane force was applied to the braces of K-joint to determine the hot-line strain distributions and the stress concentration factors (SCFs) via extrapolation. Based on the results of static loading tests, the amplitude of cyclic load can be further determined. Subsequently, high-cycle fatigue tests were performed on the square and diamond bird-beak SHS gap K-joints to investigate the fatigue behavior from different perspectives, such as failure mode, fatigue life, crack propagation, and stiffness degradation. The test results demonstrate that the brace crown region always possessed the most severe stress concentration, which coincided with the location of crack initiation. This implies that the experimentally obtained SCFs can accurately predict the crack initiation location. The test fatigue lives of bird-beak gap K-joints were compared with the predictions by the International Institute of Welding (IIW) design curves originally developed for the conventional joints.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research work was supported by National Natural Science Foundation of China (No. 51678359) and National Key Research and Development Program of China (Nos. 2016YFB1200602-28 and 2016YFB1200601-B27). The supports are gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 11 • November 2021
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© 2021 American Society of Civil Engineers.
History
Received: Sep 11, 2020
Accepted: Jun 2, 2021
Published online: Aug 17, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 17, 2022
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