Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks

LAN Tao; TIAN Wenye; ZHANG Xiaowei; LI Maobei; QIN Guangchong; LIU Xin; LI Ran; MEN Jinjie

doi:10.3724/j.gyjzG25031305

Volume 55 Issue 9

Sep. 2025

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LAN Tao, TIAN Wenye, ZHANG Xiaowei, LI Maobei, QIN Guangchong, LIU Xin, LI Ran, MEN Jinjie. Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(9): 62-72. doi: 10.3724/j.gyjzG25031305

Citation:

LAN Tao, TIAN Wenye, ZHANG Xiaowei, LI Maobei, QIN Guangchong, LIU Xin, LI Ran, MEN Jinjie. Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(9): 62-72. doi: 10.3724/j.gyjzG25031305

Citation:

LAN Tao, TIAN Wenye, ZHANG Xiaowei, LI Maobei, QIN Guangchong, LIU Xin, LI Ran, MEN Jinjie. Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(9): 62-72. doi: 10.3724/j.gyjzG25031305

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Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks

doi: 10.3724/j.gyjzG25031305

1. CSSC International Engineering Co., Ltd., Beijing 100121, China;
2. School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China;
3. China Energy Egnineering Group Shaanxi Electric Power Design Institute, Xi'an 710054, China

Received Date: 2025-03-13
Available Online: 2025-11-05

Abstract

Abstract

To investigate the fatigue damage of welded joints in 500qENH weathering steel bridge decks under complex loading conditions， this study employed ABAQUS-Franc 3D cross-platform collaborative simulation technology to model the dynamic crack propagation process， with a particular emphasis on elucidating the influence mechanisms of initial crack morphology （including depth-to-width ratio and inclination angle） and top-plate thickness on crack evolution. Numerical analysis results demonstrated that under vehicular loading， significant spatial heterogeneity of stress intensity factors （SIFs） was observed at vulnerable joints， with mid-span loading representing the most critical loading scenario. Crack propagation paths were predominantly governed by geometric constraint effects， exhibiting a phased evolution pattern characterized by an initial increase followed a by subsequent decrease in the crack depth-to-width ratio， where crack depth exerted more substantial influence on fatigue life than width dimension. Enlargement of initial crack dimensions elevated SIF amplitudes by 18% to 35%. Inclined cracks at 15° manifested 23% higher peak SIF values compared to vertical cracks. Increased top-plate thickness nonlinearly enhanced crack propagation life with progressively accelerated extension rates. Elevated wheel load pressure induced decelerating reduction rates in crack propagation life.
- Q500qENH steel,
- welded joints,
- stress intensity factor,
- finite element analysis,
- fatigue crack propagation

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References(20)

References

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