Description
A restrained frame with two additional hinged columns is loaded by vertical concentrated loads. The governing critical load factor must be calculated for the structural system and the respective effective lengths must be determined for the restrained frame posts.
Eingabeparameter and structural System
1825,53 | font-size:16px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal">kNcm2|
m | |
Loads | |
Stainless Steel 2 | style="font -family:Arial, sans-serif;font-size:16px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;background-color:#cbdbf2"> Hinged Column 1kN |
Analytical Solution
The analytical solution uses the approximate formulas according to [1] for frames with restrained footings.
The critical load factor is greater than 10, so the calculation of internal forces according to the linear static analysis in compliance with EC 3‑1‑1 would be allowable.
Compar Analytical Solution with RFEM Solution
10.085 | Lcr,li | Lcr,re |
The results between the manual calculation and RFEM 6 correspond very well. The relative deviations are less than 2%.
References
[1] ALBERT, Andrej; ua: Construction tables for engineers – with calculation notes and
examples. 23 ed. Nördlingen