Design of lean duplex stainless steel tubular sections subjected to concentrated end bearing loads at elevated temperatures

Design rules for web crippling of stainless steel tubular sections at elevated temperatures are currently unavailable. In this study, non-linear finite element models (FEMs) were developed the cold-formed lean duplex (CFLDSS) square and rectangular hollow under concentrated end bearing loads, namely loading conditions End-One-Flange (EOF), End-Two-Flange (ETF) End Loading (EL). After successful validation FEMs, an extensive parametric study 210 CFLDSS (up to 950 °C) was performed. The appropriateness design in current international specifications literature examined by comparing their ultimate strength predictions with those obtained from study. material properties room (ambient) temperature condition substituted temperatures. It found that generally unconservative not reliable, while European Code provided reliable but very conservative predictions. A new method using Direct Strength Method proposed EOF, ETF EL. assessments indicated reliable.