Structural Analysis Wiki

Technical Terms Used in Dlubal Software

The Dlubal Structural Analysis Wiki explains technical terms used in structural analysis and design. The terms are given in alphabetical order and are usually used in Dlubal Software.

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T Truss

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Truss is a Member Structure Whose Members Are Only Subjected to Axial Forces.


An ideal truss consists of members whose nodal connections consist exclusively of moment hinges, that is, no bending moments are transferred to each other.

In addition, an ideal truss is only subjected to concentrated loads on external nodes, so that neither shear forces nor bending moments arise from external loads. If this is ensured, only axial forces appear as internal forces.

In reality, of course, bending moments and shear forces also occur in the members due to their own weight.


When planning a truss, it is important to ensure that neither external nor internal displacement occurs. A triangle made of truss members is considered to be statically ideal because it is statically and kinematically determined, i.e. stable.

An example of a truss in practice is a truss, see Figure 1. Lattice girders have the advantage of bridging large spans with relatively little use of material, for example in the case of the shell construction of logistics halls or in larger dimensions as a railway bridge.

Trusses are characterized by the members at the top and bottom, i.e. the top and bottom chords, as well as by the connecting vertical and diagonal members, posts and diagonals. In the case of a truss as a single -span girder with loading from above, the bending moment is absorbed by compression in the top chord and tension in the bottom chord.

The greater the distance between the upper and lower chords, the greater the lever arm of this moment and the smaller the compression and tensile forces in the upper and lower chord.

Another example, which is often used in practice, is a lattice tower, see Figure 2, or the Eiffel Tower in Paris. Also with these spatial trusses, the advantage of saving material and planning and building effectively is in the foreground.

Trusses at Dlubal Software

With RFEM and RSTAB, Dlubal Software allows you to model and calculate structures such as trusses quickly and intuitively.

Both main programs offer the possibility to model common truss shapes particularly quickly using the model generator .

The RF-/STEEL EC3 add-on module is ideal for the design of individual members of a steel truss.

Furthermore, the RF-/TOWER add-on modules for modeling, loading and design of tower structures are available for users of Dlubal Software.

See also

  • Beam structure
  • Compression member
  • Tension member
  • Mast


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