Research on Horizontal Cracks in Web Plates of Rail Girder under High Frequency Impulsive Loads
Nowadays, bridge cranes have a tendency to be designed for big lifting capacity, wide span with high operating speed. Several long horizontal cracks have been found in web plates of the rail girder, which is terrible threat to cranes safety. Firstly, the local stress distribution of web plates is illustrated in a semicircle form based on the elastic-plastic contact theory. Then the cyclical variation of shear stress is analyzed due to high frequency and impulsive moving wheel loads. Finally, a fatigue crack propagation model is proposed according to the strain energy density law. It is found that the shear stress and welding residual stress give rise to the fatigue horizontal crack near welding seam.
Bridge crane Web plate Horizontal crack Crack growth
Dashan Dong Xiao Mei Long Liu
Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, China
国际会议
上海
英文
714-718
2011-10-21（万方平台首次上网日期，不代表论文的发表时间）