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

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

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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 tonies jj audio play character from cocomelon 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 tenga air-tech regular 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.