Seismic Design Optimization of Steel Building Frameworks
Publication: Journal of Structural Engineering
Volume 132, Issue 2
Abstract
This paper presents a multicriteria optimization method for the performance-based seismic design of steel building frameworks under (equivalent static) seismic loading. Minimizing structural cost (interpreted as structural weight) is taken as one objective. The other objective concerns minimizing earthquake damage which, since uniform postelastic ductility demand over all stories generally avoids local weak-story collapse, is interpreted as providing a uniform interstory drift distribution over the height of the building. That is, the overall objective for the design of a building framework is to have minimum structural weight and uniform plastic ductility demand while, at the same time, meeting displacement and strength constraints corresponding to the various performance levels. Explicit forms of the objective functions and constraints in terms of member sizing variables are formulated to enable computer solution for the optimization model. The concepts are illustrated for three-story and nine-story steel building frame examples.
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Acknowledgments
This work is sponsored by the National Science and Engineering Research Council of Canada,NRC and forms part of the PhD researchstudy of the second writer under the supervision of the other two writers.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 2 • February 2006
Pages: 277 - 286
Copyright
© 2006 ASCE.
History
Received: Apr 13, 2004
Accepted: May 3, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Christopher M. Foley
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