Single-span Steel Beam


The STT+ program performs the cross-sectional and structural safety verifications in accordance with the equivalent member method for single-span beams of sectional steel under uniaxial or biaxial bending and/or shear force. The verifications are performed as per Eurocode 3, the regulations of the implemented national annexes are taken into account.

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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, circular hollow sections, rectangular/square hollow sections available as standard steel shapes
  • I-sections, circular hollow sections, rectangular/square hollow sections definable by the user


  • Rigid supports at both ends
  • Additional definition of lateral intermediate supports (continuous, in the middle of the span, in the third points, in the quarter points, at a distance x)
  • Automatic consideration of the self-weight.
  • Uniform linear load, concentrated load (Q/N), concentrated moment, triangular load, trapezoidal loads.
  • Automatic generation of the load case combinations.

The program maps automatically all necessary combinations of actions in accordance with the safety concept set forth in Eurocode 0.

Structural safety

Either the elastic or plastic cross-sectional resistance is verified. In this verification, the internal forces are determined in a first-order analysis. Furthermore, the system’s load-bearing capacity is verified based on the equivalent member method (optionally) either in accordance with paragraph 6.3.3 Annex A or B or with paragraph 6.3.4.


In connection with the serviceability verification, the displacements are determined separately for the different main axes. Deformations are also calculated in a first-order analysis. The user must specify the design situation that should be used for the serviceability analysis.

Document file formats
  • PDF
  • Word
  • Printer

Output profile:

  • pre-set brief output
  • user-defined scope

Result graphs:

  • Internal forces: N, My, Qz, Mz, Qy, NMQ
  • Deformations: vy, vz
  • Stresses: σ,x ; τ,z ; σ,v
  • Utilization Eta: n,el ; n,pl ; n,stability
Transfer options
  • Single-span Steel Column STS+
  • Steel Girder Support ST4
  • Reinforced Concrete Column B5+
  • Reinforced Concrete Column B5
  • Reinforced Concrete Corbel B9
  • Timber Column HO1+
  • Lateral Torsional Buckling Analysis BTII+
Import options
  • ASCII-file
  • ASCII-file (with selectable options)
Export options
  • Word
  • PDF
Steel construction
  • DIN EN 1993
  • ÖNORM EN 1993
  • BS EN 1993
  • PN EN 1993