Vol. 22, No. 2, pp. 143-152 (2026)
STUDY ON THE FATIGUE PERFORMANCE OF CROSS-WELDED STEEL
FABRIC FOR SIMPLE-SUPPORTED BOX GIRDER OF HIGH-SPEED RAILWAY
Chuang Du *, Qi-Hui Gao, Jin-Li Qiao, Xiao-Tong Liu and Didier Nshimiyimana
School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 26 February 2025; Revised: 26 June 2025; Accepted: 26 June 2025
DOI:10.18057/IJASC.2026.22.2.2
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ABSTRACT
By utilizing intelligent construction technology, the production process of the steel fabric for simply - supported box girders in high - speed railways has been upgraded from manual binding to automatic welding. However, welding can affect the fatigue performance of steel bars. To evaluate this impact, fatigue tests were conducted on five groups of specimens as well as the base metal. The test results indicate that fatigue failure occurred at the welded spot, presenting as a brittle failure. As the stress amplitude decreases, the fatigue life of the specimens increases significantly. The fatigue life is more sensitive to stress changes at low - stress amplitudes. When the stress ratio increases, both the fatigue life and the stress amplitude decrease, and the sensitivity of the fatigue life and stress amplitude to the stress ratio gradually increases. On the overall fatigue S - N curve, the stress amplitude corresponding to a fatigue life of 2 million cycles for the welded steel bar was approximately 128.72 MPa. Compared with the base metal, the stress amplitude decreased by 45.75%. The stress amplitude under ultra - high cyclic loading was predicted. The coupling relationship of stress-amplitude stress-ratio fatigue-cycle was fitted and analyzed, relevant equations were derived, and a safety line for the values of stress amplitude and stress ratio was determined.
KEYWORDS
Cross-welded steel bars, Fatigue test, S-N curve, Stress ratio, Fatigue performance
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