Research Spotlight: Stability Analysis of Steel Columns under Cascading-Hazard of Earthquake and Fir
2017 Annual Stability Conference Presentation
Session SS2B – Technical Presentations: Stability at Elevated Temperatures Tuesday, March 21, 2017 3:15 pm
Stability Analysis of Steel Columns under Cascading-Hazard of Earthquake and Fire
In this study, a nonlinear finite element formulation is developed and utilized to perform stability analysis of W-shape steel columns subjected to non-uniform longitudinal temperature profiles in the absence or presence of inter-story drift, representing residual drift following an earthquake. This formulation takes into account the residual stress distribution in steel hot-rolled W-shape sections, initial geometric imperfections in the steel columns, non-uniform longitudinal temperature distribution, and temperature-dependent material properties. The results indicate an excellent agreement with available strength design equations of steel columns at ambient and elevated temperatures. A set of equations is then proposed to predict the critical buckling stress in steel columns under fire and fire following earthquake considering residual drifts and non-uniform longitudinal temperature distributions. The proposed equations can be implemented to investigate the performance of steel structures under fire and fire following earthquake considering stability as engineering demand parameter.
Mehrdad Memari and Hussam Mahmoud, Colorado State University, Fort Collins, CO