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Steel plasticity with buckling
This example demonstrates computation of structural detail, where a girder beam crosses a column. A welded pair of U profiles 300 mm creates both cross-sections of the beam and the column. Geometry and mesh were created in Salome and converted to OOFEM input file via Unv2oofem convertor.
This task contains 10 383 nodes and 30 786 linear tetrahedral elements. Perfectly plastic material is assigned to steel with the yield strength of 200 MPa. Arc-length method with IML solver were employed. The maximum axial force 1.58 MN on the column leads to collapse in plastic/buckling mode. Updated Lagrangian formulation ensured updating nodal position after each time increment thus facilitating second-order theory and equilibrium on deformed shapes assuming small strains.