Export of Nonlinear Stiffness

Technical Article on the Topic Structural Analysis Using Dlubal Software

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Technical Article

In the case of a reinforced concrete model represented as a mixed structure consisting of surface and member elements, the design is carried out in different modules.

The nonlinear calculation of deformations in cracked section (state II) can be considered in both the RF-CONCRETE Surfaces and RF-CONCRETE Members add-on modules. In order to eventually represent the deformation of the entire structure, it is necessary to enable the consideration of the resulting stiffnesses between the modules.

For this, there is a function for exporting the stiffness, which is to be selected under Settings for Nonlinear Calculation in the module. Before this, you have to activate the stiffness export function for the respective load cases or load combinations under Extra Options in RFEM.

There are two options for exporting:

  • Individual: The stiffness export is applied only for a load case or load combination with previously determined stiffness.
  • Consistent for reference load: The stiffness export is applied for all load cases or load case combinations. So the stiffness to be exported depends on a specific load, which has to be previously selected.


Dipl.-Ing. (FH) Adrian Langhammer

Dipl.-Ing. (FH) Adrian Langhammer

Product Engineering & Customer Support

Mr. Langhammer is responsible for the development of the add-on modules for reinforced cocrete, and provides technical support for our customers.


Downstand beam Rib Deformation Cracked state State II (cracked)


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  • Updated 05/21/2021

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

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