8 January 2020

FAQ 004303 EN

Sandy Matula

Modeling | Loading

RFEM

RSTAB

When entering surface loads, you can enter a correction factor to take into account the continuous beam effect. For the outer members or supports of a continuous beam, factor 0.8 is entered in the model that I have taken over from a colleague. Should the factor for an outer field not have to be 0.4?

Answer

In the following example, the loads are distributed linearly depending on the spacing of the members, without considering the respective continuous beam effect. Correction factors are used to take these into account. To assign the load correction factors to the members, select the members on which the load is to be corrected.

For the edge members, the load correction factor is 0.8 because the internal loading of the members on the edge is automatically halved (for the same span).

Force values according to the table book for a continuous beam with five sections:

A = 0.395
B = 1.132

0.395/0.5 = 0.8 -> When calculating factor 0.4, the load would be incorrect.

The members in field 1 will be corrected to 1.1.

After having clicked the [OK] button, the load is adjusted automatically.

Keywords

Continuous beam Continuous beam effect Correction factor

Reference

[1]   Manual RSTAB. (2013). Tiefenbach: Dlubal Software.
[2]   Manual RFEM. (2018). Tiefenbach: Dlubal Software.
[3]   Albert, A.: Schneider - Bautabellen für Ingenieure mit Berechnungshinweisen und Beispielen, 23. Auflage. Köln: Bundesanzeiger, 2018

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RFEM Main Program
RFEM 5.xx

Main Program

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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RSTAB 8.xx

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The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

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