The deformation of two adjacent members calculated with the RF‑CONCRETE Members add‑on module differs from each other. What is the cause?


The deformation calculated with RF‑CONCRETE Members represents a simplified calculation according to the standard. In this case, the deformation at the point of the maximum loading is only calculated first. This value and the value of the linear deformation of RFEM or RSTAB at this location are used to calculate a factor. The complete deformation distribution from RFEM or RSTAB will then be multiplied by this factor, and then displayed in the results of the add-on module.

Figure 01 shows a comparison of the results of the linear calculation from RFEM and the calculation of the add-on module. In this case, the calculated factor is approximately 2.66.

It is important that the deformation can actually be compared at the location of the maximum deformation only. Only there, the calculation is actually available. Therefore, various deformations may occur for the connected members, as shown in Figure 02.


Deformation U_z Uz Serviceability limit state Deformation analysis


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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

Price of First License
3,540.00 USD
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

Price of First License
2,550.00 USD
RSTAB Concrete Structures

Add-on Module

Linear and nonlinear analysis of reinforced concrete members with reinforcement concept

Price of First License
810.00 USD
RFEM Concrete Structures

Add-on Module

Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)

Price of First License
810.00 USD