Research Spotlight: Stability Requirements of Deep Steel Wide-Flange Columns under Cyclic Loading
2017 Annual Stability Conference Preview:
Session S2 – Seismic Stability of Members and Systems Wednesday, March 22, 2017 9:45 am
Stability Requirements of Deep Steel Wide-Flange Columns under Cyclic Loading
This research investigates the hysteretic behavior of deep wide-flange steel columns that are typically used in steel moment-resisting frames (MRFs) in North America. This is achieved through an extensive parametric study using a validated continuum finite element (FE) modeling approach. Based on the FE results, the cyclic deterioration in the column flexural strength and stiffness is evaluated. Accordingly, design recommendations are developed related to the seismic compactness criteria for highly ductile members such that column axial shortening can be reduced under design basis and low-probability of occurrence earthquakes. Furthermore, empirical equations are developed for predicting the out-of-plane force demands and the plastic hinge length in steel wide flange columns.
Ahmed Elkady and Dimitrios G. Lignos, Swiss Federal Institute of Technology, Lausanne (EPFL), Switzerland