The deformation of two adjacent members calculated with the RF-CONCRETE Members module deviates from each other. What is the cause?


The deformation calculated with RF-CONCRETE Members represents a simplified calculation according to the standard. Only the deformation at the point of maximum loading is calculated first. From this value and the value of the linear deformation of RFEM or RSTAB at this location, a factor is calculated. Then, the complete diagram of deformation based on RFEM or RSTAB will be multiplied by this factor and then output in the results of the add-on module.

In Figure 01, you can see a comparison of the results of the linear calculation from RFEM and the calculation of the add-on module. The calculated factor will be approximately 2.66.

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


Deformation U_z Uz Serviceability 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