Strength Analysis FEA for a Gantry Tower Crane

  • Scope of Work: The crane underwent modification works on the starboard side. Our scope of work was to ascertain that these modifications had not affected the original designed SWL.
  • Approach: The analysis of the structures of the Gantry Crane was carried out by means of 3D modeling and FEA (Finite Element Analysis).
  • Load Scheme: forces resulting from the winch,
    forces resulting from the heave compensation,
    forces on sheaves,
    main static forces acting on the crane structures, ­
    forces due to ship inclination and motion.
  • Objective: to demonstrate the same stress status of un-modified structures
  • Workflow: PREPROCESSING (Modeling)
    - Define the geometric domain of the problem.
    - Define the element type(s) to be used.
    - Define the material properties of the elements.
    - Define the geometric properties of the elements (length, area, and the like).
    - Define the element connectivities (mesh the model).
    - Define the physical constraints (boundary conditions).
    - Define the loadings.
    - Computes the unknown values of the primary field variable(s).
    - Computed values are then used by back substitution to compute additional, derived variables, such as reaction forces and element stresses.
    POSTPROCESSING (Visualization of solution results)
    - Postprocessor software contains sophisticated routines used for sorting, printing, and plotting selected results from a finite element solution.
    - Stresses, strains, and deformations are plotted and examined to see how the part responded to the various loading conditions
  • Test: The tower was overload tested with successful results and accepted by the Charters