Evaluation and Improved Recommendations for Seismic Design of Wide-Flange Columns in Steel Moment-Resisting Frames
Steel moment-resisting frames (MRFs) are one of the most desirable seismic force-resisting systems for the construction of building structures because of their high architectural versatility, use of long-span beams and significant ductility capacity. A common design practice is the use of deep wide-flange columns to efficiently satisfy stringent storey drift limits specified by building codes, resulting in a lighter structural system. Recent studies on deep wide-flange sections have shown significant strength and stiffness deterioration and undesirable failure modes in columns that develop plastic hinges at their base. Particularly, deep slender columns can be prone to lateral out-of-plane instability that can compromise the load-carrying capacity of such columns. Such a limit state is not properly addressed in current seismic design provisions. This project aims to evaluate the current seismic design provisions for steel wide-flange columns in S16 and provide recommendations for improvement with a focus on the stability of deep columns. Advanced numerical simulations using OpenSEES and detailed continuum finite element analysis with ABAQUS are used to analyze the response of deep wide-flange columns in MRFs with an emphasis on design level seismic excitation.
Abrar completed his B.Sc. in Civil Engineering at the University of Alberta in April 2019. During his undergrad years he completed student work experience terms at the City of Edmonton, PCL Construction and Imperial Oil. After the completion of his undergraduate degree he decided to pursue further education in structural engineering and began his M.Sc. in September 2019. His research focuses on the design of steel moment frames under the supervision of Dr. Ali Imanpour.