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

Phan, Duoc T. and Lim, James B.P. and Tanyimboh, Tiku T. and Wrzesien, A.M. and Sha, Wei and Lawson, R.M. (2015) Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm. Engineering Structures, 93. pp. 36-49. ISSN 0141-0296

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    Abstract

    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.