FAQ 000620 EN

1 December 2017

Robert Vogl Calculation RFEM RF-SOILIN RSTAB

Is it possible to perform an analysis according to the stiffness modulus method in RSTAB or RFEM?

Answer

No, it is not. Instead, a variation of the subgrade reaction modulus method is used. The relation to the stiffness modulus ES is not possible.

In RFEM, a multi-parameter foundation model has been implemented. This can be used to carry out very realistic settlement calculation.

The problem, however, is to find precise values for the parameters Cu,z, Cv,xz, and Cv,yz. For this, the RF-SOILIN add-on module is helpful: 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 by using a nonlinear method. These parameters are load-dependent and influence the behaviour of the structure. The results of this iterative process are realistic settlements and internal forces in the structure.

Keywords

stiffness modulus method subgrade reaction modulus method foundation model foundation surface elastic foundation soil

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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RFEM Other
RF-SOILIN 5.xx

Add-on Module

Soil-structure interaction analysis and determination of elastic foundation coefficients based on soil data

Price of First License
760.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD