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On-line Journal of the IASS

Vol. 38 (1997) No. 3 December n. 125

A novel type of cabledome

< Table of Contents for Vol. 38 (1997) No. 3 December n. 125
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 38 (1997) No. 3 December n. 125
  • Title: A novel type of cabledome
  • Author(s): W. Bin Bing
  • Keywords: tensegrity, cabledome
Cabledome, as an expansion of tensegrity concept in cable networks, spans the space with continuous tension cables and discontinuous compression posts. Since it is basically a boundary anchoraged cable network, its unit structural weight does not increase so directly with its span. Thus as a dome form, it is presently a most advantageous large span system. But a cabledome has almost no natural stiffness, its cables must remain in tension for all potential loading conditions. That is because its cable truss is kinematically indeterminate, in which the slackening of a single cable will induce critical problem and the failure of a single element would cost the use of the entire structure. Its poor mechanical properties lead to its inconveniency in erection. During the erection, cabledome is gradually formed during the process of prestressing, with prestress distribution and structural outshape adjusting through renewed self equilibrium, and cablenet undergoing large displacements and rotations. The complexity of construction process limit its large scale expansion since there are only a few corporations in the world can construct cabledome. A novel type of cabledome, named by the author, with its cable truss introduced by additional cables, reforms the conventional kinematically indeterminate cabledome into a kinematically determinate one. It is capable of sustaining all loading conditions without relying on prestress. The efficiency of Wang's dome is proved by cases studies in detail. The studies show that the additional cables work and slacken alternatively under varied loading conditions to remove all possible mechanisms efficiently. Because of its excellent mechanical properties, Wang's dome simplifies construction process, expands the application scale in rectangular plan layout and free boundaries. Therefore, Wang's domes can replace cabledomes and be constructed in large scale as large span space structures, presenting prospering foreground.

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