Abstract
This article focuses on a cracking steel crane girder of one factory, on the basis of extensive investigation and research on the fatigue damage of cracking steel crane girder at home and abroad. Sectional stress is redistribution and the stress concentration phenomenon of the crack tip has been alleviated. After reinforcement, the local stiffness of the upper flange and web greatly increases, The results show that it can extend the fatigue remaining service life of fatigue cracking of the steel crane girder by increasing the effective cross section area and stiffness, and it is a good guide on reinforcement and maintenance of actual industrial plant cracking steel crane girder.
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