Steel Bracing


The ST12+ program is used to calculate steel bracing typical in the construction of portal frames. It allows the calculation of compression-slack diagonal steel struts for latticed and solid-web trusses.

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Different materials can be selected for the individual components. The following materials are available:

  • 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:

  • Truss with compression-slack diagonal struts
  • Constant span lengths, a symmetrical division or individual span lengths


  • Trusses:  I-sections as standard shapes or user-defined sections
  • Posts: I-sections, circular, square and rectangular hollow sections as standard shapes or user-defined sections
  • Diagonal struts: I-sections, circular, square and rectangular hollow sections, angular, round, and flat steel as standard shapes or user-defined sections


  • Hinged supports at the bottom chord of the bracing
  • The wind loads are determined automatically based on the defined building geometry.
  • The determination of the wind loads depends on the specified location of the building
  • Automatic determination of the stabilising loads either as uniformly distributed loads as per DIN EN 1993-1-1, 5.3.3 or as node loads in accordance with Petersen Stahlbau (Grundlagen der Berechnung und baulichen Ausbildung von Stahlbauten)
  • The user can enter user-defined load cases in addition
  • Automatic generation of the load case combinations
  • Concentrated load (transverse) and line load (transverse) at the top and bottom chord

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 with consideration of the applying stabilisation loads and the failure of the diagonal compression strut. For the diagonal tension struts, the cross-sectional resistance of the compression posts is verified. In addition, a stability verification as per DIN EN 1993-1-1, 6.3.1 is performed. The verification of the chord for the additional axial chord force is not supported in this software.

Document file formats
  • PDF
  • Word
  • Printer

Output profile:

  • Pre-set brief output or user-defined scope

Result graphs:

  • Internal forces: N, My, Qz
  • Stresses: σ,x ; τ,z ; σ,v
  • Utilisation Eta: n,el ; n,pl ; n,stability
Transfer options
  • Framework RSX
Import options
  • ASCII-file
Export options
  • Word
  • PDF
Structural safety verifications
  • DIN EN 1993
  • ÖNORM EN 1993
  • BS EN 1993
Wind loads


  • DIN EN 1991-1-4
  • ÖNORM EN 1991-1-4
  • BS EN 1991-1-4

Support resources