I get different results when comparing the deformation analysis in the RF-CONCRETE Modules and another calculation program. What could be the reason for this?

Answer

Differences resulting from the determination of the deformation in the cracked state can have different causes. The following points should be checked for deviations:

Is the same calculation method applied?
RF-CONCRETE Deflect uses an analytical analysis approach according to EN 1992-1-1 7.4.3.
RF-CONCRETE NL uses a physically nonlinear analysis approach.
More detailed information about the calculation methods can be found, for example, in the RF-CONCRETE Surfaces Guide in Chapter 2.7 and 2.8.

Is the same initial structure available?
The results of the linear calculation provide the best tool for consideration if the underlying system should be taken for equivalent. The linearly determined deformation of the underlying combination should be approximately equal. Any possible differences in the linear deformation may be increased in the cracked state in connection with the deformation analysis.

Are the same effects taken into account?
When performing a comparison, make sure that the same effects as for example creep and shrinkage are taken into account (Figure 02). 

Are the same input values available?
Furthermore, it should be checked in connection with the deformation analysis if the same input values are available. In this case, it is necessary to pay particular attention to whether the applied reinforcement (Figure 03) and the lever arm or concrete cover are the same.

If not having found the cause after the fundamental examination, please contact our hot line.

Keywords

Comparison Program comparison Deformation analysis State II Nonlinear Differences Cause Frilo RIB D.I.E.

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