Fatigue crack propagation characteristics of steel bridge deck roof-longitudinal rib weld joint under random wheel load

LU Naiwei1,2, LIU Jing1, WANG Kai3, WANG Honghao1

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 193-201.

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PDF(3825 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 193-201.

Fatigue crack propagation characteristics of steel bridge deck roof-longitudinal rib weld joint under random wheel load

  • LU Naiwei1,2, LIU Jing1, WANG Kai3, WANG Honghao1
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Abstract

The transverse distribution of wheel tracks is a key factor to generate random stress spectrum at welded joints of orthotropic steel bridge deck. In addition, the morphology of welding defect are random in nature. Thus, the random propagation behavior of fatigue cracks in steel bridge deck was induced. In order to study the random propagation characteristics of fatigue cracks at the welded joints of steel bridge deck, the effect of wheel tracks transverse distribution on equivalent stress intensity factor of welded root and toe of orthotropic steel bridge deck were analyzed based on the fracture mechanics theory and extended finite element method. The effect of wheel tracks transverse dispersion, initial crack depth and initial crack morphology ratio on distribution of random propagation path of fatigue cracks at welded joints were revealed. The results indicate that transverse distribution of vehicle wheel tracks has a significant effect on the stress intensity factor of the fatigue cracks of the welded root and the welded toe. The maximum equivalent stress intensity factor of welded root is 85.99(MPa•mm1/2), which was 6.72% higher than that of welded toe. The dispersion degree of transverse distribution of wheel tracks and initial crack depth are positively correlated with the dispersion of random propagation path distribution of fatigue cracks of welded joints of orthotropic steel bridge deck, and the initial crack morphology ratio is negatively correlated with them.

Key words

bridge engineering / orthotropic steel bridge deck / the finite element method / random propagation path / the transverse distribution of wheel tracks / stress intensity factor

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LU Naiwei1,2, LIU Jing1, WANG Kai3, WANG Honghao1. Fatigue crack propagation characteristics of steel bridge deck roof-longitudinal rib weld joint under random wheel load[J]. Journal of Vibration and Shock, 2024, 43(1): 193-201

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