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Technologies 2017, 5(4), 81; doi:10.3390/technologies5040081

Design Optimization of Long-Span Cold-Formed Steel Portal Frames Accounting for Effect of Knee Brace Joint Configuration

1
Department of Civil and Construction Engineering, Faculty of Engineering and Science, Curtin University Malaysia, Miri Sarawak 98009, Malaysia
2
Department of Civil and Environmental Engineering, Faculty of Engineering, University of Auckland, Auckland 1010, New Zealand
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 25 November 2017 / Accepted: 8 December 2017 / Published: 12 December 2017
(This article belongs to the Section Construction Technologies)
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Abstract

The application of cold-formed steel channel sections for portal frames becomes more popular for industrial and residential purposes. Experimental tests showed that such structures with long-span up to 20 m can be achieved when knee brace joints are included. In this paper, the influence of knee brace configuration on the optimum design of long-span cold-formed steel portal frames is investigated. The cold-formed steel portal frames are designed using Eurocode 3 under ultimate limit states. A novel method in handling design constraints integrated with genetic algorithm is proposed for searching the optimum design of cold-formed steel portal frames. The result showed that the proposed routine for design optimization effectively searched the near global optimum solution with the computational time is approximate 50% faster than methods being popularly used in literature. The optimum configuration for knee brace joint can reduce the section size of rafter and so the lighter frame could be obtained especially for long-span portal frame. The minimum weight of main frame obtained from optimization process is approximate 19.72% lighter than a Benchmark Frame used in the full-scale experimental test. View Full-Text
Keywords: long-span portal frame; cold-formed steel; genetic algorithm; penalty strategy; constraint handling long-span portal frame; cold-formed steel; genetic algorithm; penalty strategy; constraint handling
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Phan, T.D.; Lim, J.B.P.; Selowara Joo, M.; Lau, H.-H. Design Optimization of Long-Span Cold-Formed Steel Portal Frames Accounting for Effect of Knee Brace Joint Configuration. Technologies 2017, 5, 81.

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