Stability Analysis for Steel


The STX+ program is used to perform stability verifications for single-part members with fork supports based on the equivalent member method.

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Discover now more programs from the section Steel!

  • Structural steel: S235, S275, S355, S450
  • Annealed steel (S275N – S460N)
  • Thermo-steel (S275M – S460M)
  • Weathering steel (S235W – S355W)
  • High-temperature steel (S460Q – S460QL1)
  • Hollow section, hot-finished (S235H – S355H)
  • Hollow section, hot-finished, fine-grain (S275NH – S460NH)
  • User-defined steel
Structural system

Available systems:

  • Statically determined, fork-mounted single-span beam.


  • I-sections, I-sections with inclined flange, rectangular and circular hollow sections as standard shapes or user-defined sections.


  • Rigid or elastic supports at both ends.
  • Rotational springs about the y-axis and about the x-axis can be defined at the member ends.
  • The effective length can be pre-set.
  • Definition of the actions via the design internal forces.
  • Axial compressive force.
  • Moments about the y-axis and about the x-axis at one or both ends of the member and in the span at any point x.
Structural safety

Either the elastic or plastic cross-sectional resistance is verified. Furthermore, the verification of the system’s load-bearing capacity is performed using the equivalent member method either in accordance with section 6.3.3 Annex A or B or with section 6.3.4.

Document file formats
  • PDF
  • Word
  • Printer
  • pre-set brief output
  • user-defined scope
Transfer options
  • Lateral Torsional Buckling Analysis BTII+
Import options
  • ASCII-file
Export options
  • Word
  • PDF
  • ASCII-file
Steel construction
  • EN 1993
  • DIN EN 1993
  • ÖNORM EN 1993
  • BS EN 1993

Support resources