PRFELB is a user-friendly computer program for predicting the elastic flexural-torsional buckling load factor of beams and plane rigid frames. The frame can be subjected to point forces and moments and uniformly distributed loads in its plane. The frame can be restrained by rigid or elastic point restraints, or continuous restraints. The members may be monosymmetric such that their plane of symmetry is the plane of the structure. PRFELB can also analyse the flexural-torsional buckling of beams of any cross-section, provided the axial forces are zero.

PRFELB first performs a 1st order elastic analysis of a plane rigid frame. It calculates the in-plane pre-buckling stress resultants which are then used in the flexural-torsional buckling analysis. The results of the 1st order elastic analysis include the in-plane deformations and stress resultants at buckling. The results of the flexural-torsional buckling analysis include the buckling load factor and the buckled shape.



Setup file

Copy protection and purchasing

The program PRFELB is copy-protected to prevent unauthorised copying of the program.

The setup file installs the demonstration copy of PRFELB. The demonstration copy allows PRFELB to be executed three times only. The user can inspect the data input and the results output of the program but cannot perform an analysis. Examples are provided in the directory Working, which is a subdirectory of the PRFELB program file directory.

To convert this into a fully licensed copy, a site key must be obtained. To obtain a site key, the user must supply the site code for their computer. The site code is obtained by pressing ENTER when the PRFELB splash screen appears after starting the program. When the site key is typed in and Validate is pressed, the demonstration copy of PRFELB becomes a fully licensed copy.


Single-user licence – $1,000 + GST

Multi-user licence (5 copies) – $2,000 + GST