A Multi-Scale Study on Thermal Creep Effects on Fire Behavior of Hybrid Steel Columns Consisting of Ultra-High Strength Steel Tubes and Stainless Steel Plates

This thesis studies the performance of Grade 1200 UHSS tubes and Grade 304 stainless steel plates at both material and component scales under transient heating conditions, with a focus on their thermal creep. A robust model is developed for the materials' thermal creep, which is ideal for structural fire design applications. Furthermore, it is investigated to what extent the thermal creep of the UHSS and stainless steel can affect the performance of compressive members composed of these materials under transient heating conditions. Finally, exclusive design equations for these components under building fires through extensive parametric simulations in ABAQUS software.