Research on Structure Security Evaluation and Fault Diagnosis of Gate Crane Jib

The service of gate crane is the age limit, and there are many problems, such as the fallen rivets and the thinner steel plates due to corrosion. The author makes three dimensional modeling and performs the finite element computation of jib system with the I-DEAS software in this paper, and then carries out failure and effects analyses and fault tree analyses based on the computations. Simulation results shown the stress computation values of jib system at certain observation points have surpassed allowable stress of structural strength. But they are smaller than the metal structure material strength limit. The RPN value and fault tree smallest cutest of the jib system got by the reliability can provide the important reference for the enterprise users in the use and maintenance of gate cranes in future.The research work indicates that the user should make the inspection regularly for jib systems and take measures to make reasonable repair in order to avoid grave accidents.