Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm

Duoc T. Phan , James B.P. Lim, Tiku T. Tanyimboh, Andrzej Wrzesien, Wei Sha, R. M. Lawson

Research output: Contribution to journalArticle

13 Citations (Scopus)


This paper describes a stressed-skin diaphragm approach to the optimal design of the internal frame of a cold-formed steel portal framing system, in conjunction with the effect of semi-rigid joints. Both ultimate and serviceability limit states are considered. Wind load combinations are included. The designs are optimized using a real-coded niching genetic algorithm, in which both discrete and continuous decision variables are processed. For a building with two internal frames, it is shown that the material cost of the internal frame can be reduced by as much as 53%, compared with a design that ignores stressed-skin action.

Original languageEnglish
Pages (from-to)36-49
JournalEngineering Structures
Publication statusPublished - 15 Jun 2015
Externally publishedYes


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