Glossary Term

In structural analysis, imperfection is an assumed production-related deviation of structural components. It is assumed that, for example, a support has both a curvature and an inclination and this geometric imperfection significantly influences the buckling behaviour.

Exemplary are the standards EN 1993‑1‑1, EN 1993‑1‑6 and EN 1992‑1‑1. They include the information about the type and size of imperfections, which usually must be taken into account for the stability analysis.


Imperfection Curvature Inclination Equivalent imperfection


RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD