Dome-Shaped Space Trusses Formed by Means of Posttensioning
Publication: Journal of Structural Engineering
Volume 122, Issue 10
Abstract
Dome-shaped space trusses can be derived from a flat configuration by means of posttensioning. The structure considered here is devised to be a near mechanism initially and during the posttensioning operation. It is a near mechanism as only the flexural stiffness of the continuous top chords provides any resistance to deformation. Therefore, no appreciable force is induced in the members of the structure during the shape formation process. The results of experimental and theoretical work on the shape formation of a dome-shaped space truss by means of posttensioning are presented herein. An analytical procedure that includes both geometric and material nonlinearities is developed to determine the final shape of the dome-shaped space truss, using commercially available finite-element software. The ultimate aim is to lead to significant economies in the construction of large-span lightweight structures by eliminating or minimizing the need for scaffolding and heavy cranes in the shaping and erection of such structures.
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References
1.
Dehdashti, G. (1994). “Shape formation and ultimate load behaviour of post-tensioned space trusses,” PhD thesis, Univ. of Wollongong, Wollongong, Australia.
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Ellis, W., and Lodi, E. (1991). A tutorial introduction to mathematica . Books/Cole Publishing Co., Calif.
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Gould, P. L. (1988). Analysis of shells and plates. Springer-Verlag, New York, N.Y.
4.
Schmidt, L. C., and Dehdashti, G. (1993a). “Curved space trusses formed from single-chorded planar space trusses.”ACMSM 13: Proc., 13th Australasian Conf. on the Mech. of Struct. and Materials, L. C. Schmidt, ed., Univ. of Wollongong, Australia.
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Schmidt, L. C., and Dehdashti, G. (1993b). “Shape creation and erection of metal structures by means of post-tensioning.”Space structures 4: Proc., 4th Int. Conf. on Space Struct., H. Nooshin, ed., Thomas Telford, London, England.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 122 • Issue 10 • October 1996
Pages: 1240 - 1245
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Oct 1, 1996
Published in print: Oct 1996
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