Vol. 3, No. 1, pp. 485-511 (2007)
DESIGN OPTIMIZATION OF STEEL MOMENT FRAMES UNDER EXTREME EARTHQUAKE LOADING
Yanglin Gong
Department of Civil Engineering, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1
Tel.: +1-807-343-8412; fax: +1-807-343-8928.
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Received: 3 May 2005; Revised: 26 May 2006; Accepted: 5 June 2006
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ABSTRACT
The paper presents a design optimization method for steel moment frames under extreme earthquake loading. Seismic responses of the structures are evaluated using a nonlinear pushover analysis procedure. Minimum structural cost and uniform heightwise ductility demand are identified as the design objectives. Roof and interstory drifts are taken as design constraints. Strong-column weak-beam requirement is treated as additional constraints for special moment frames. The sensitivities of inelastic displacements are employed to explicitly formulate the objective functions and constraints in terms of member sizing variables. A dual method is then used to search for an optimal design solution. The proposed design methodology is illustrated for a nine-story moment frame example.
KEYWORDS
structural optimization; seismic design; steel moment frames; pushover analysis; ductility; design sensitivity analysis
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