Research Article
Dec 1970
Optimization of Redundant Prestressed Structures
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VIEW THE REPLYAuthor: Leonard SpuntAuthor Affiliations
Publication: Journal of the Structural Division
Volume 96, Issue 12
Abstract
The load index approach to structural optimization is extended to similar or mixed element systems with statically determinate or redundant prestressed configurations and under multiple load conditions. Employing component optimization expressions reduces the problem to an unconstrained search through a space defined in terms of variables which express the relative orientation of component elements and the redundant loads. It is shown that a minimum weight truss may be prestressed redundant under a single external load condition if the internal prestress is considered as a separate load condition, i.e., the truss must not fail under the internal prestress in the absence of the applied load. Multiple load truss applications show that additional weight savings over previous analyses can be realized by optimizing bar orientation and redundant load. Optimizing of redundant loads, however, will in general require a turnbuckle in series with a flexible spring in order to maintain a unique prestress under multiple load conditions.
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Published In
Journal of the Structural Division
Volume 96 • Issue 12 • December 1970
Pages: 2589 - 2606
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Dec 1970
Published online: Feb 1, 2021
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Leonard Spunt
Assistant Professor; Engrg., San Fernando Valley State Coll., Northridge, Calif.
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