Is it possible to perform stability analyses on reinforced concrete structures by means of RF-STABILITY?

Answer

Since concrete has a nonlinear material behavior that can only be simulated with the CONCRETE NL module, it is not possible to analyze it with the RF-STABILITY add-on module.

The use of another material model such as isotropic linear elastic or isotropic plastic would not represent the crack formation correctly and the results are therefore not usable.

A stability analysis on columns can be carried out with RF-CONCRETE Columns or RF-CONCRETE Members. You can find a small example in Downloads.

This example includes the design of a column by the RF-CONCRETE Columns add-on module. Make sure that the calculation of the internal forces in RFEM is performed according to the first-order analysis and that no imperfections are required because the method used in the module takes them into account.

The example also involves the design by means of RF-CONCRETE NL Members. Here again, it is necessary to calculate according to the second-order analysis and imperfections in the form of inclinations are required. For better comparability, the layout of the longitudinal reinforcement was aligned with the result from RF-CONCRETE Columns, as shown in Figures 01 and 02. Since the reinforcement is optimized by the module after a new calculation, the wanted reinforcement was saved as a template (see red arrow).

Keywords

Stability Buckling Column Concrete Reinforced concrete

Downloads

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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-STABILITY 5.xx

Add-on Module

Stability analysis according to the eigenvalue method

Price of First License
1,030.00 USD