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Elastic Stability Analysis of Thin-Walled C- and Z-Section Beams without Lateral Restraints

Diana Šimić Penava orcid.org/0000-0001-5862-1852 ; Faculty of Civil Engineering, University of Zagreb, Zagreb, Croatia
Ana Radić ; Faculty of Civil Engineering, University of Zagreb, Zagreb, Croatia
Tanja Ilijaš orcid.org/0000-0002-7547-0504 ; Faculty of Civil Engineering, University of Zagreb, Zagreb, Croatia

Sažetak

The paper analyzes the elastic stability of steel thin-walled C-and Z-cross-section beams without lateral restraints. Firstly, mechanical properties of the beams material (steel) are determined by testing standard specimens in a laboratory. Based on the obtained data, the stability analysis of beams is carried out and critical forces are determined analytically by using the theory of thin-walled beams, numerically by using the finite element method (FEM), and experimentally by testing the C- and Z-cross-section beams in a laboratory. The analysis of critical forces and stability shows that the calculation according to the theory of thin-walled beams does not take the effect of local buckling into account, and that the resulting critical global forces do not correspond to the actual behaviour of the beam. The FEM gives the value of the critical force by taking the effect of the local buckling into consideration. The experimental test shows that the assumptions and simplifications, which have been introduced into the theory of thin-walled beams with open cross sections, significantly affect final results of the level of the critical force.

Ključne riječi

elastic stability; critical force; thin-walled beam; C- and Z-section; finite element method

Hrčak ID:

125666

URI

https://hrcak.srce.hr/125666

Datum izdavanja:

29.7.2014.

Posjeta: 2.406 *