Determination of Buckling Load in RF-STABILITY / RSBUCK

The partial safety factor γ_M for reducing the modulus of elasticity is very likely activated in RFEM/RSTAB, but is not considered in the manual calculation.

γ_M can be displayed and adjusted, if necessary, in the "Edit Material" dialog box; see Image 01.

1 Partial Safety Factor γM

Furthermore, the "Activate stiffness modifications from RFEM/RSTAB" option must be considered in the General Data in the RF‑STABILITY or RSBUCK add-on module; see Image 02.

2 Activating Stiffness Modifications from RFEM

For the effective length of 35.405 m, the second moment of area of 8,356 cm⁴, the modulus of elasticity of 21,000 kN/cm², and the partial safety factor of 1.1 as a divisor, the following buckling load results (see also Image 03) according to the following formula:

3 Effective Lengths and Critical Loads