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Advisor(s)
Abstract(s)
The optimal design of cold-formed steel columns is addressed in this paper, with two objectives: maximize the local-global buckling strength and maximize the distortional buckling strength. The design variables of the problem are the angles of orientation of cross-section wall elements the thickness and width of the steel sheet that forms the cross-section are fixed. The elastic local, distortional and global buckling loads are determined using Finite Strip Method (CUFSM) and the strength of cold-formed steel columns (with given length) is calculated using the Direct Strength Method (DSM). The bi-objective optimization problem is solved using the Direct MultiSearch (DMS) method, which does not use any derivatives of the objective functions. Trade-off Pareto optimal fronts are obtained separately for symmetric and anti-symmetric cross-section shapes. The results are analyzed and further discussed, and some interesting conclusions about the individual strengths (local-global and distortional) are found.
Description
Keywords
Multiobjective optimization Cold-formed steel Maximum strength Local buckling Global (flexural) buckling Distortional buckling
Citation
MADEIRA, J.F.A.; Dias,JOAQUIM; SILVESTRE,NUNO; - Multiobjective optimization of cold-formed steel columns. Thin-Walled Structures. ISSN. 0263-8231. Vol. 96 (2015), pp. 29-38.
Publisher
ELSEVIER SCI LTD