Research Article
May 1977
Discrete Sizing of Trusses for Optimal Geometry
Publication: Journal of the Structural Division
Volume 103, Issue 5
Abstract
The optimal configuration and discrete member sizes are automatically determined to minimize the cost of three-dimensional indeterminate truss structures under multiple loading conditions. Member areas and joint coordinates are used as design variables. Design constraints include Euler buckling and specified limits on member stresses, member sizes, and joint displacements. Design variables may be linked and members can be deleted. The design process is separated into geometry modifications using the complex method and suboptimization using the stress ratio method and an analogous scaling procedure for displacement constraints. For each geometry change, discrete member sizes are selected from a table of allowable values. The method is applied to the cost minimization of a 25-member space truss using discrete steel angle sections that are chosen from a table satisfying AISC code requirements, and comparisons are made with minimum weight designs and with continuous variable methods.
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Information
Published In
Journal of the Structural Division
Volume 103 • Issue 5 • May 1977
Pages: 1031 - 1046
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: May 1977
Published online: Feb 1, 2021
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Authors
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Samuel L. Lipson, F.ASCE
Prof. and Head of Civ. Engrg., Univ. of British Columbia, Vancouver, BC, Canada
Lawrence B. Gwin, M.ASCE
Research Assoc., Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver, BC, Canada
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.