Considering Shrinkage in RF-CONCRETE Surfaces

Technical Article on the Topic Structural Analysis Using Dlubal Software

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Shrinkage and creep are time-dependent deformation properties of concrete. They usually have to be considered in the serviceability limit state design.

Concrete shrinks during hardening and drying. This results in a shrinkage deformation, which is described by the total shrinkage strain εcs. The total shrinkage strain is composed of the autogenous shrinkage εca (basic shrinkage strain) and the drying shrinkage εcd.

In the RF‑CONCRETE Surfaces add‑on module for RFEM 5, it is now possible to consider the shrinkage of the concrete directly in the module.

To do this, you have to activate the shrinkage in the settings for the serviceability limit state design. For the analytical method of the serviceability limit state design, you need the RF‑CONCRETE Deflect add‑on module; for the non-linear calculation, you need RF‑CONCRETE NL. If shrinkage is activated in the settings for the serviceability limit state design (in Window 1.1 General Data), the ‘Shrinkage’ tab becomes available in Window 1.3 Surfaces (see picture).

In this window, you can enter the parameters required to determine the shrinkage strain and make the following settings:

  • Setting the considered concrete age
  • Selection of cement type
  • Age of concrete at start of shrinkage
  • Relative humidity
  • alternative approach of drying shrinkage and/or autogenous shrinkage

Furthermore, you can define a total shrinkage strain εcs determined elsewhere as user-defined shrinkage and select the surfaces to which this will be applied.

Alternative to the input in RF‑CONCRETE Surfaces, the shrinkage strain can also be entered in a separate load case as surface load (load type ‘Axial strain’), as was already possible in RFEM 4.

Author

Dipl.-Ing. (FH) Paul Kieloch

Dipl.-Ing. (FH) Paul Kieloch

Product Engineering & Customer Support

As technical support, Mr. Kieloch answers the questions of Dlubal Software customers, and is responsible for the development of the add-on modules for reinforced concrete structures.

Keywords

Shrinkage Creep Concrete Autogenous Drying shrinkage Restraint Imposed deformation Hardening Drying

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  • Updated 04/19/2021

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