When starting the calculation in RF-CONCRETE Surfaces, I receive the error message “Failed to calculate the deflection for the result combination”. Why? What can I do to solve this problem?


The RF-CONCRETE add-on module Deflect is available for the calculation of state II deformations in RF-CONCRETE Surfaces.

For the analytical calculation of deformations in state II, RF-CONCRETE Deflect requires a unique load situation, which is given only by using the load combinations (CO). Result combinations do not provide an explicit load situation, no matter if an additive or an enveloped OR-combination. Therefore, when applying the RC for the calculation of deformations in RF-CONCRETE Surfaces by RF-CONCRETE Deflect, you receive the mentioned error message. See Figure 01.

To avoid this problem, you can simply generate load combinations (CO) instead of result combinations (RC). If you still want to perform the ultimate limit state design with RC's, you can manually create a LC in addition to the existing RCs for which you want to calculate the deformations by means of RF-CONCRETE Deflect. See Figure 02.

It is important that RF-CONCRETE Surfaces calculates the loads from the quasi-permanent design situation by default for the calculation of the deformations. See Figure 03. This means that the LC for which the deformations are to be calculated must be defined as “Quasi-permanent”. Alternatively, the check boxes for the settings of the design situations (see Figure 03) can be user-defined.


Error no. 2358 2358 Deformation Deflection Result combination Load combination Analytically State II Deflect


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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

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3,540.00 USD
RFEM Concrete Structures

Add-on Module

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

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810.00 USD
RFEM Concrete Structures
RF-CONCRETE Deflect 5.xx

Add-on Module

Analytical deformation analysis of plate structures consisting of reinforced concrete

Price of First License
400.00 USD