In connection with the nonlinear calculation for the serviceability limit state designs, I get implausibly large crack width and deformation values in the RF-CONCRETE Modules (see Figure 1). What is the cause and how can I fix the problem?


Please note that in the context of the nonlinear calculation, the reinforcement is not increased automatically. A nonlinear calculation is based on an already provided reinforcement. This provided reinforcement can result, for example, from the ultimate limit state designs or from a defined basic reinforcement. The reinforcement applied for the SLS designs can be displayed graphically (see Figure 2).

Cause of the Problem:

If no reinforcement results from the ULS or the basic reinforcement in some areas, the serviceability limit state design is carried out without the applied reinforcement, and very high results may result, for example in the crack width.

Solution to the problem:

It should be ensured that there is a reinforcement in each zone of the structure. This can be implemented by applying a basic reinforcement (see Figure 3).


High Large Implausibly Values Result values Crack width Steel stress Deformation Reinforced concrete Nonlinear

Contact us

Contact Dlubal Software

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

(267) 702-2815

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

Physical and geometrical nonlinear calculation of beam and plate structures consisting of reinforced concrete

Price of First License
1,300.00 USD