The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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The dialog box for defining the soil profile is deactivated when deactivating the dependent designs in the detail settings.
Entering a soil profile is not required for the following design types:
As soon as you activate one of the options mentioned above, the dialog box to enter the soil profile will also be available again.
RF‑/FOUNDATION Pro is a further development of the RF‑/FOUNDATION add-on module.
The main differences are as follows:
No, that is not possible. The calculation of the foundation parameters in RF‑SOILIN is performed iteratively. The first iteration step requires that the start values for the foundation parameters are selected internally by the program. These start values can be used to perform a finite element analysis of the FE model in RFEM.
The result is soil contact stress distribution. The soil contact stress of the first iteration step is included in the RF‑SOILIN calculation as the initial value. Together with the stiffness modulus of the soil layers entered, it is possible to calculate the settlement for each finite element. The settlement and the soil contact stress are then used to calculate the foundation parameters.
In the next iteration step, the new foundation parameters replace the old ones, and a new finite element analysis is started, which results in a new distribution of soil contact stress. As a convergence criterion, the new distribution of soil contact stress is compared to the old one.
As long as the deviation exceeds a certain convergence limit, the new distribution of soil contact stress in RF‑SOILIN is considered in the calculation of the new foundation parameters. If the deviation of the soil contact stress distribution of two consecutive iteration steps is not reached the first time, the iteration is ended and the foundation parameters of the last iteration step are given as a result in RF‑SOILIN.
Yes, this is possible in RFEM 5 and RSTAB 8. To do this, activate the calculation of Settlement in RF‑/FOUNDATION Pro. The export of the spring stiffness requires a calculation as "rigid plate". You can specify this in the settings for the settlement calculation (see Image 01).
After the calculation, the export option is available using the "File" menu in RF‑/FOUNDATION Pro (see Image 02).
The export of stiffnesses is possible in RFEM 5 and RSTAB 8.
RFEM and RSTAB use a variation of the subgrade reaction modulus method. The relation to stiffness modulus ES is not possible.
In RFEM, a multi-parameter foundation model has been implemented. This can be used to carry out a very realistic settlement calculation.
The problem, however, is to find precise values for the parameters Cu,z, Cv,xz, and Cv,yz. For this, you can use the Geotechnical Analysis add-on (for RFEM 6) or the RF-SOILIN add-on module (for RFEM 5): the subgrade parameters are calculated from the loads and the data of the geotechnical report (stiffness modulus or modulus of elasticity and Poisson's ratio, specific weights, layer thicknesses) for each individual finite element using a nonlinear method. These parameters are load-dependent and influence the behavior of the structure. The results of this iterative process are realistic settlements and internal forces in the structure.