The Analysis of the State of Stress and Strain of a loaded Portal Crane, using FEM, with respect to the Strength, Stiffness and Stability

摘要

The paper's subject is highly topical, is very interesting from scientific point of view but also very complex. The authors propose to study the elastic structures of the cranes on basis of the similarity criteria, for this purpose the two basis criteria are shortly presented: Hooke and Cauchy. One underlines that the gantry and the half gantry cranes work outside, being subjected to actions as time changing loads; under these circumstances one needs a special check of the crane's stability. The basic study is that one based on the analysis with finite elements, using ABAQUS software - advanced software with highly efficient possibilities of modelling. By graphical post processing are presented the equivalent fields of stresses von Mises and of deformations. The sensitive zones where the failure of the crane may occur are: 1. the main beam of profile I, where the support beam is welded (fig. 1 and fig. 1/part. II), Sil; 2. the main beam, the longitudinal tube, straight in the zone where the support stand is welded, Si2; 3. the support stand, in the welding zone to the straight longitudinal tube; 4. the main beam, the longitudinal tube at left, in the zone where the support stand is welded, fig. 1/part II, Si4; 5. the support stand, where the left longitudinal tube is welded, Si5.