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Structural Engineering and Mechanics Volume 6, Number 6, September 1998 , pages 693-710 DOI: https://doi.org/10.12989/sem.1998.6.6.693 |
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Studies on post-tensioned and shaped space-truss domes |
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Schmidt LC, Li HW
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| Abstract | ||
| This paper concerns studies on the shape formation of post-tensioned and shaped steel domes. The post-tensioned and shaped steel domes, assembled initially at ground level in an essentially flat condition, are shaped to a curved space form and erected into the final position by means of a posttensioning technique. Based on previous studies on this shape formation principle, three post-tensioned and shaped steel domes have been constructed. The results of the shape formation tests and finite element analyses are reported in this paper. It is found that the first two test domes did not furnish a part-spherical shape as predicted by finite element analyses, because the movements of some mechanisms were not controlled sufficiently. With a revised post-tensioning method, the third dome obtained the theoretical prediction. The test results of the three post-tensioned and shaped domes have shown that a necessary condition to form a desired space shape from a planar layout with low joint stiffnesses is that the movements of all the existing mechanisms must be effectively controlled as indicated by the finite element analysis. The extent of the maximum elastic deformation of a posttensioned and shaped steel structure is determined by the strength of the top chords and their joints. However, due to the semi-rigid characteristic of the top chord joints, the finite element analyses cannot give a close prediction for the maximum elastic deformations of the post-tensioned and shaped steel domes. The results of the current studies can be helpful for the design and construction of this type of structure. | ||
| Key Words | ||
| space structure, finite element, post-tensioning, construction | ||
| Address | ||
| Schmidt LC, Univ Wollongong, Dept Civil & Min Engn, Wollongong, NSW 2500, Australia Univ Wollongong, Dept Civil & Min Engn, Wollongong, NSW 2500, Australia | ||