Optimization of Cold-Formed Thin-Walled Cross-Sections in Portal Frames

Portal frames with built-up cold-formed cross-sections hold significant potential; however, there is a notable gap in the analysis of cross-section types and connections. In this study, an optimization algorithm was developed for the closed cross-sections of portal frame members. An optimization alg...

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Bibliographic Details
Published in:Buildings (Basel) 2024-08, Vol.14 (8), p.2565
Main Authors: Stulpinas, Mantas, Daniūnas, Alfonsas
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Cold
Cold working
cold-formed steel
Cross-sections
Design optimization
Design specifications
Eurocodes
Finite element analysis
Frames
Genetic algorithms
global buckling
local buckling
Mathematical optimization
Optimization
Parametric analysis
portal frames
Stiffeners
thin-walled structures
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Summary:Portal frames with built-up cold-formed cross-sections hold significant potential; however, there is a notable gap in the analysis of cross-section types and connections. In this study, an optimization algorithm was developed for the closed cross-sections of portal frame members. An optimization algorithm was tested against optimized open cold-formed cross-sections. The results indicated a portal frame volume up to 38% lower where members were assembled of optimal closed cross-sections when compared to frames with optimal open cross-sections. Parametric analysis was carried out, where two types of cross-sections were examined: Type A, with four web stiffeners bent inwards, and Type B, with four web stiffeners bent outwards. The optimization was conducted using a Genetic Algorithm in MATLAB R2022b. Portal frames with optimal Type B cross-sections had a volume that was up to 22% lower when compared to frames with optimal Type A cross-sections. Significant differences were noted between the optimal beam and column cross-sections, with the optimal column cross-section thickness being on average 74% greater, but the optimal beam cross-section height being on average 81% greater than those of the respective counterparts. In this article, a practical assembly solution for the connection of the frame members was proposed for the optimized novel closed cross-section types in portal frames. However, the strength and stiffness of these connections were not analyzed in this research.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14082565