| Citation: | CHEN Kang-ming, FAN Lin-jie, WU Qing-xiong, LUO Jian-ping. Research on improving the fatigue resistant performance of circular hollow section K-joint by high-strength bolt stop-hole method[J]. Journal of Traffic and Transportation Engineering, 2026, 26(5): 95-110. doi: 10.19818/j.cnki.1671-1637.2026.039
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This paper aims to investigate the effect of the high-strength bolt crack arresting method on improving fatigue resistance performance of steel tubular K-joints. Both model tests and combined finite element simulations by adopting MSC.MARC and MSC.Fatigue were carried out, and the hot-spot stress distribution and fatigue evolution process of steel tubular K-joints improved by the high-strength bolt crack arresting method were revealed. Additionally, a calculation method for the stress concentration relief factor and a fatigue life prediction formula for steel tubular K-joints improved by the high-strength bolt crack arresting method were proposed. Finally, the effectiveness of the high-strength bolt crack arresting method in improving the fatigue resistance performance of steel tubular K-joints was evaluated by utilizing S-N curves. The results indicate that the fatigue evolution process of K-joints improved by the drilling crack arresting method and high-strength bolt crack arresting method can be divided into six stages, including crack initiation, crack propagation, drilling crack arresting/high-strength bolt crack arresting, secondary crack initiation, secondary crack propagation, and specimen failure. The combined finite element simulations of steel tubular K-joints improved by the high-strength bolt crack arresting method demonstrate a maximum error of only 11.9%. For steel tubular K-joints improved by the high-strength bolt crack arresting method, the calculation formula for the stress concentration relief factor and fatigue life prediction formula exhibit maximum deviations of 17.8% and 19.7% respectively compared with experimental or finite element simulation results. The fatigue strength of steel tubular K-joints improved by the drilling crack arresting method is 58.9% lower than the API standard recommended value, and thus this method can only be employed as a temporary reinforcement measure. In contrast, the fatigue strength of steel tubular K-joints improved by the high-strength bolt crack arresting method exceeds the API recommended value by 16.0%-34.4%, making this method suitable for long-term reinforcement.
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