Investigation of Experimental Behavior of Lateral Torsional Buckling of Upe-Type Channel Steel Beam
International Journal of Civil Engineering, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s40999-026-01255-9
- Dergi Adı: International Journal of Civil Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, Compendex, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Channel section, Finite element analysis, Lateral torsional buckling, UPE steel beam
- Gazi Üniversitesi Adresli: Evet
Özet
Thin-walled steel beams are structural members subjected to axial and bending forces. Lateral-torsional buckling (LTB) is one of the main failure modes of thin-walled steel beams. Thin-walled steel beams bent about their strong axis may buckle out of plane by deflecting laterally and twisting as the values of the applied loads reach a limiting state. The LTB failure mode occurs suddenly in this steel beam element with a much greater in-plane bending stiffness than torsional or lateral bending stiffness. The LTB failure mechanism in thin-walled slender steel beam elements is a stability problem that can develop suddenly. Experimental studies on this topic are very limited. A literature review revealed that the majority of studies on this topic have examined IPE or IPN steel beams with symmetrical cross-sections. There has been no comprehensive experimental study of the LTB, which is a stability problem for uni-directionally symmetric UPE beams. For this reason, an experimental study was planned, and 9 UPE80 steel cantilever test members were tested under the effect of a monotonically increasing point load applied to the cantilever. The variables examined within the scope of the experimental study are the cantilever beam length and the shear force location applied to the cantilever endpoint in the beam section. As the lengths of the cantilever beams decreased, the ultimate load capacity increased by an average of 26%, the maximum vertical and lateral displacement decreased by 10% and 12%, respectively, and the maximum torsion angle increased by 21%. The ultimate load capacity maximum vertical and horizontal displacement values of the samples whose loading position at the beam endpoint was the bottom flange were 10%, 13%, and 14% greater on average than those of the beams loaded via the web. The ultimate capacity maximum vertical and horizontal displacement values of the beams loaded via the web were 14%, 8%, and 9% higher on average than those of the beams loaded via the top flange. In addition, a nonlinear simulation of the experiments was carried out in a computer environment using ABAQUS software for comparison with the experimental results. The numerical results were compared with the experimental results, and the extent to which the analysis was successful was interpreted.