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FAQ 002681 EN

25 March 2019

Daniel Dlubal Results RFEM RSTAB

Why is the bending moment characteristic in the oblique bar different to my hand calculation? Normally there should be no bending moments.

Answer

The reason for the occurrence of a bending moment in the inclined and straight girder is that the central column has a certain elasticity due to its finite stiffness. Thus, a compression occurs on the central column so that the deformation of the central column also affects the right beam. As the right horizontal beam is additionally supported on a displaceable support, an axial moment is created at this location.


It is especially evident from the respective deformations (see Figure 2).
The deformation encircled in Figure 2 is decisive for the formation of the bending moment in the right part of the structure.

The calculation by means of RFEM results in minimum bending moments, which are, however, not considered in the manual calculation (see Figure 3).

Keywords

Bending moment Internal forces Results

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RFEM 5.xx

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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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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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