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


For the calculation of deformations in cracked sections (state II), the RF‑CONCRETE Deflect extension is available in the RF‑CONCRETE Surfaces add-on module.

RF‑CONCRETE Deflect requires an explicit load situation for the analytical calculation of deformations in cracked sections (state II), which is only given 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 an RC for the calculation of deformations in RF‑CONCRETE Surfaces by using 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 RCs, 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 for the calculation of the deformations, RF‑CONCRETE Surfaces applies the loads from a quasi-permanent design situation by default. See Figure 03. This means that the LC, for which the deformations are to be calculated, must be defined as "quasi-permanent." As an alternative, it is also possible to user-define the check boxes for the settings of design situations (see Figure 03).


Error No. 2358 2358 Deformation Deflection Result combination Load combination Analytically Cracked sections 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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RFEM Concrete Structures

Add-on Module

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

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RFEM Concrete Structures
RF-CONCRETE Deflect 5.xx

Add-on Module

Analytical deformation analysis of plate structures consisting of reinforced concrete

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400.00 USD