Fermo - buckling

Lateral buckling of precast concrete girder in cracked state


  • non-linear, biaxial analysis of the buckling stability according to EN 5.8.6
  • geometric and physical non-linear calculation at the deformed system with the load step method
  • consideration of the contribution of the concrete between the cracks (Tension Stiffening)
  • consideration of varying load application points (BE, TE, neutral axis, arbitrary)
  • horizontal imperfection user-defined or automatic affine to the 1. eigenmode
  • the creep influence can be considered in the automatic calculation of the imperfection
  • user-defined or automatic combination generation for up to 4 different points in time, respectively, support systems: transport support, assembly support, finishing and t∞ with final support
  • separate reduction of the torsion stiffnesses in condition I and II
  • output of all relevant system limit load factors
  • output of the non-linear stress resultants for the 1,0-fold system limit load
  • output of the effective stiffnesses due to the 1,0-fold system limit load
  • shear force and torsion bearing capacity due to the 1,0-fold system limit load
  • flange connecting reinforcement due to the 1,0-fold system limit load



The program application uses the powerful FEM technology of TRIMAS® for the ultimate load design in cracked state. This provides the following special features:

  • Realistic system modelling for the lateral buckling analysis in the case of slender beams
  • realistic evaluation of transportation and construction stages
  • Evaluation of stiffness degrading caused by box outs
  • Economic verification for highly utilised systems


Cover Picture: Bremer AG, Paderborn

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