Testing, modelling and design of normal and high strength steel tubular beam-columns

The influence of yield strength on the in-plane stability and design structural steel square rectangular hollow section (SHS RHS) beam-columns under compression plus uniform bending is investigated in this study. Ten buckling tests were carried out hot-finished S690 SHS 100×100×4 (in mm) specimens combined uniaxial bending. Finite element (FE) models RHS established, validated employed to perform parametric studies, where supplementary resistance data numerically derived. Through comparisons with test FE data, shortcomings current EC3 beam-column interaction curves revealed, particularly higher domain. A modified approach was developed accordingly, featuring more accurate end points re-calibrated factors, shown significantly improve accuracy consistency for both cold-formed over a wide spectrum grades. Subsequent reliability analysis confirmed applicability partial safety factor proposed approach.