FAQ 000626 EN-US

12/01/2017

Robert Vogl Calculation RSTAB RFEM

For a simple bending-resistant frame, I obtain very large deformations. What is the reason for this?

Answer

For the cross-section area A, a very large value has been entered manually. Extremely high values may lead to numerical problems when solving the equation system.

Check the results with smaller values. Also, check whether the sum of loading and support forces are equal.

Note:

The automatic calculation of the dead load is done by means of the density of the material and the surface A. In your example, you obtain very great loads. You can either change the value A, deactivate the dead load in General Data of the load case, or set the material thickness to zero.

Keywords

stiffness deformation

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RSTAB Main Program
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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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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