About the author  ⁄ Kevin R. Mackie, Ph.D., P.E.

Kevin R. Mackie, Ph.D., P.E., is an Associate Professor and Associate Chair at the University of Central Florida, Orlando, FL. He is the chair of the ASCE/SEI Seismic Effects technical committee. He can be reached at kevin.mackie@ucf.edu.

It is no mystery that there are still uncertainties and lack of guidance when conducting nonlinear seismic analysis of structures. The challenge remains that the modeling, type of nonlinearities, and parameters required for analysis oftentimes vary from project-to-project and person-to-person depending on the assumptions that are made in light of limited guidance.

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Advances in computational tools for earthquake engineering analysis continue to broaden the structural engineer’s ability to conduct performance-based simulations, evaluate ductility, and make decisions on performance criteria that involve deformations of a structure beyond the elastic limit.

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