Study of residual life prediction and maintenance decision-making of portal crane

As a main equipment of port production, a portal crane is usually repaired according to the status for reducing loss by halting it, and for safe and normal production of port enterprises. This paper studies the defect categories of it, based on metal structure fault detection, to understand the actual status of a portal crane, as a basis for making maintenance decisions. A method for safe assessment of structure is made via the monitor of stress value of the fault areas, with the statistic analysis and the Paris model. The crack sensitive areas and stress values are confirmed with the finite element analysis and test method, predicting the residual life of cracked structural members of a portal crane, and confirming reasonable maintenance time and inspection cycle. This paper also shows a case study of engineering practice, justifying that it can provide port enterprises with the efficient and long term technical guarantee in both theory and practice, for safe use of the structural members, reducing notably economic loss caused by halting production.