FAQ 002683 EN 26 March 2019

Daniel Dlubal Results RSTAB RFEM

Why is the deflection of a reinforced concrete beam in RSTAB / RFEM in condition 1 different from my manual calculation?


It can often be the case that the selection of outdated materials can have an effect on the deformation of the wearer. It should be noted that the material characteristics should always be taken from the respective standard. For the material characteristics of the same material may differ depending on the standard and its National Annex.

For example, the same concrete was selected in this example, but the concrete has C35 / 45 | DIN 1045-1 compared with the concrete C35 / 45 | DIN EN 1992-1-1 on a lower modulus of elasticity (see Figure 1). As a result, there is also a greater deflection in the middle of the reinforced concrete beam, which is only loaded by its own weight (see Figure 2).


Deflection Deformation Materials Hand calculation Modulus


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RSTAB Main Program
RSTAB 8.xx

Main Program

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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2,550.00 USD
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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