STUDY ON FATIGUE PERFORMANCE AND STRENGTHENING METHOD OF RIGHT-ANGLE CATASTROPHE STEEL CRANE BEAM

The fatigue failure of steel crane beams has caused many safety accidents and has become one of the hot issues in the field of industrial buildings. A right-angle crane beam is the most common form of crane beams. In order to study the fatigue damage mechanism and reinforcement method of right-angle crane beams and improve the fatigue resistance of traditional steel right-angle crane beams, the reinforcement measures of one three-web structure are proposed on the basis of clarifying the stress concentration position of a crane beam support. Through finite element simulation analysis and experimental research, the reinforcement effect of the setting method and the three-web structure on the cracked bearing is explored; the structural stress distribution along the weld length at the stress concentration position before and after reinforcement at the support is analyzed, and the reinforcement effect of the three-web structure is verified. The study results show that compared with the traditional right-angle bearing, the maximum structural stress at each position of the three-web bearing decreases by 60%, and the stress intensity factor at the crack decreases by about 50%; The fatigue life of crane beam can be greatly increased under both no cracked and cracked conditions.