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A platform for research: civil engineering, architecture and urbanism
Multiobjective optimization of cold-formed steel columns
Abstract 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.
Graphical abstract Display Omitted
Highlights Multiobjective optimization is used to maximize the strength of coldformed steel columns. Two objectives maximize separately local/global and distortional strengths Maximization of local/global strength leads to a decrease of maximum distortional strength (and vice-versa). Symmetric sections are better than anti-symmetric ones for distortional strength maximization Anti-symmetric sections are better than symmetric ones for local/global strength maximization
Multiobjective optimization of cold-formed steel columns
Abstract 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.
Graphical abstract Display Omitted
Highlights Multiobjective optimization is used to maximize the strength of coldformed steel columns. Two objectives maximize separately local/global and distortional strengths Maximization of local/global strength leads to a decrease of maximum distortional strength (and vice-versa). Symmetric sections are better than anti-symmetric ones for distortional strength maximization Anti-symmetric sections are better than symmetric ones for local/global strength maximization
Multiobjective optimization of cold-formed steel columns
Madeira, J.F.A. (author) / Dias, Joaquim (author) / Silvestre, Nuno (author)
Thin-Walled Structures ; 96 ; 29-38
2015-07-29
10 pages
Article (Journal)
Electronic Resource
English
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