In the Knowledge Base, you’ll find technical articles and tips & tricks that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
AnswerBasically, a soil sample is enough to determine the terrain model or the soil structure. However, if the layer thicknesses along the foundation body change, further soil samples should of course be defined (see Figure 1). The result of the floor structure can be displayed in the screen view of RFEM (see Figure 2).
No, in RSTAB and RFEM, it is not possible to perform an analysis according to the stiffness modulus method. Instead, a version of the subgrade reaction model is used. The stiffness modulus E cannot be taken into account.
RFEM uses a multi-parameter subgrade model. It can carry out very realistic settlement calculation. The problem, however, is to find precise values for the parameters C1,z, C2,x, and C2,y.
The add-on module RF-SOILIN helps you do this. From the loads and the data of the geotechnical report (stiffness modulus or modulus of elasticity and poisson's ratio, specific weights, layer thicknesses) the subgrade parameters are calculated for each individual finite element by using a nonlinear method. These parameters are load-dependent and influence the behavior of the structure. This is addressed by an iterative procedure. The results are realistic settlements and more precise internal forces in the structure.
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