Cyclic behavior of deep slender wide-flange steel beam-columns under combined lateral drift and axial load

Elkady, Ahmed and Lignos, Dimitrios G. (2013) Cyclic behavior of deep slender wide-flange steel beam-columns under combined lateral drift and axial load. In The 10th US national conference on earthquake engineering (10NCEE). Earthquake Engineering Research Institute..

Record type: Conference or Workshop Item (Paper)

Abstract

During a seismic event, first-story columns in steel Special Moment Frames (SMFs) experience lateral drift demands coupled with axial load. Deep slender wide-flange sections are typically selected for the seismic design of SMFs in North America. In this paper, the cyclic behavior of a range of wide-flange beam-columns is investigated through detailed finite element analysis (FEA). The FEA simulations are used to evaluate: (a) the cyclic deterioration in flexural strength of the wide-flange beam-columns; (b) their pre-capping plastic rotation; and (c) the column axial shortening. The FEA simulations demonstrate the high rates of cyclic deterioration in flexural strength experienced by wide-flange sections with web and flange slenderness ratios near the compactness limits of current seismic design provisions. It is found that a deep slender wide flange column experiences more than two times the axial shortening of a stocky wide flange column. It is also found that the pre-capping plastic rotation is underestimated for highly compact wide-flange sections undergoing cyclic lateral loading based on the current modeling recommendations for steel components (PEER/ATC 72-1).

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