FAQ 000272 EN 1 December 2017

Robert Vogl Calculation RFEM RSTAB

Do I have to activate the favourable effect due to tensile forces when calculating a structural system with tension members according to the second-order analysis?

Answer

In general, the 'Consider favorable effects due to tension of members' check box is appropriate for every structural system.

The standards include provisions to consider favourable effects with a smaller partial safety factor as an action. However, varying partial safety factors would involve a disproportionate amount of effort.

RFEM and RSTAB provides the option to generally set the tension forces to zero. This approach is on the safe side. To do this, clear the check box.

On the other hand, the standards also refer to actions. Therefore, it would be possible to decide for each action, whether it has a favourable or unfavourable effect. An action that is seen as having a globally unfavourable effect can have a local favourable effect. If the axial forces are to be included in the calculation as unchanged, select the check box.

Keywords

second-order analysis tension force effects tension force

Reference

[1]   Petersen, C. (1982). Statik und Stabilität der Baukonstruktionen (2nd ed.). Wiesbaden: Vieweg & Sohn.

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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

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