Abstract: A 450 t heavy-duty bridge crane in a steel plant often appears in the operation of wheel-rail contact abnormalities and the phenomenon of stripping off the surface of the wheel and rail.In order to explore the reasons,first detect the track on-site and found that there is a straightness deviation of the track center of J-K/10-1 crane beam.Maximum deviation is 34 mm.In order to explore the reasons of the stripping of the wheel and rail surface and the influence of the anomaly on the wheel-rail contact,the finite element method is used to analyze the wheel and rail under different load conditions and straightness anomalies.Summarizes the variation law of the contact stress distribution of wheel and rail with the increase of load,and analyzes the reason of stripping and detachment of wheel and rail surface.The analysis of the straightness anomaly shows that the inside of the wheel is gradually in contact with the outside of the track after the deviation of 10 mm in straightness.When the offset is 30 mm,the contact pressure is increased by 31.39 % from 525.54 MPa,which is the main reason for the wheel side wear.

Key words: bridge crane, wheel-rail contact, straightness, finite element, contact stress