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12.17: Economical design of high strength steel trusses using multi‐criteria optimization
Author(s) -
Mela Kristo,
Tiainen Teemu,
Heinisuo Markku
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.417
Subject(s) - truss , welding , fabrication , multi objective optimization , pareto principle , topology optimization , computer science , mathematical optimization , volume (thermodynamics) , structural engineering , reliability engineering , engineering , mechanical engineering , mathematics , medicine , physics , alternative medicine , pathology , quantum mechanics , finite element method
Evaluating the economy of high strength steel in structural applications is typically difficult since accurate cost data is not available. In this study, multi‐criteria optimization approach is employed to provide the designer with a decision‐making tool for finding compromise solutions between material and fabrication costs without the need for cost data. Structural weight, painted area and volume of welds are the three conflicting and non‐commensurable criteria considered. These quantities represent the main sources of costs in tubular trusses, namely material, surface treatment and welding. By examining the Pareto optimal solutions, the trade‐off between weight savings and fabrication costs can be assessed. The proposed approach is especially suitable when applying topology optimization, as the number of braces can be varied during optimization, which has clear impact on the fabrication costs.