Among the advantages of the elastic-plastic calculation in RFEM are the calculation time and number of necessary iterations. Furthermore, the material can now save plastic distortions or deformations in every load increment and use them for the next calculation steps. With this material behavior, it is thus possible to take into account the loading and unloading of a material, whereby the plastic deformation in the material is preserved.
Creating Elastic-Plastic 2D/3D Material Model
Mr. Frenzel is responsible for developing products for dynamic analysis. He also provides technical support for customers of Dlubal Software.
!["Failure all if PZ' Negative" Nonlinear Support](/en/webimage/010285/3040138/EN01.png?mw=512&hash=e00640dcd4db19bb872634151a9f2b6af2ded6d2)
!["Spring" Member Type](/en/webimage/010409/3011652/01-en.png?mw=512&hash=65e98cfe859ce35a3e3e9da47a0ef9335401520e)
![Deactivating Nonlinear Effects](/en/webimage/010287/2985223/EN.png?mw=512&hash=13ca394876ddab7df26a4a056b8bd869bf876b64)
![Saving and Importing Diagrams for Member Hinges](/en/webimage/010427/2984202/01-EN.png?mw=512&hash=17127434c06258f349409b3e8f047f6d0e8c4ea7)
![Spring Stiffness of Wall](/en/webimage/007143/1592702/000020-en-us-png.png?mw=512&hash=b86cec35b1b9710d47791f39429d3b4208ad4820)
It is possible to specify nonlinearities of member end releases (yielding, tearing, slippage, and so on) and supports (including friction). There are special dialog boxes available for determining the spring stiffnesses of columns and walls based on the geometry specifications.
![Feature 002421 | Displaying Result Values on Isolines](/en/webimage/031922/3325367/Isolinien_EN.jpg?mw=512&hash=7128e1d3476cede4a52641e47eb2532fdaa44a70)
Result values for deformations, internal forces, stresses, and so on, can be displayed on the isolines.
![Isometric Display of Spatial Yield Surface (Source: Explanatory Report on Research Project "DDMaS - Digitizing the Design of Masonry Structures"](/en/webimage/030993/3299694/53_(1).png?mw=512&hash=7193b10f53ed10727f51caee9a094b21a1e153cd)
Did you know that To calculate masonry structures, a nonlinear material model has been implemented in RFEM. It is based on the approach of Lourenco, a composite yield surface according to Rankine and Hill. This model allows you to describe and model the structural behavior of masonry and the different failure mechanisms.
The limit parameters were selected in such a way that the design curves used correspond to a normative design curve.
![Slab-Wall Connection in RFEM](/en/webimage/030994/3487602/002395_EN.png?mw=512&hash=644ecd61d980cbe03cb0ea80db64f0e549dc147c)
RFEM allows you to use a special line hinge to model the special properties of the connection between the reinforced concrete slab and masonry wall. This limits the transferable forces of the connection depending on the specified geometry. You guess right: This means that the material cannot be overloaded.
The program develops interaction diagrams that are applied automatically. They represent the various geometric situations and you can use them to determine the correct stiffness.