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Vol. 49 (2008) No. 1 April n. 157

Dodecahedric Mutually Supported Element Space Structure: Numerical Modelling

< Table of Contents for Vol. 49 (2008) No. 1 April n. 157
  • 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. 49 (2008) No. 1 April n. 157
  • Pages: 3-18
  • Title: Dodecahedric Mutually Supported Element Space Structure: Numerical Modelling
  • Author(s): J. P. Rizzuto
  • Keywords: Mutually Supported Elements, Space Structures, Numerical Modelling
Single or multiple circuits of mutually supported elements (MSEs) can produce very interesting and novel 3-dimensional architectural forms. Only pairs of elements are required to be connected to one another when a circuit of MSEs is constructed. Within a circuit, the basic concept is that the primary structural members rely on each other for support. These novel spatial structures give rise to additional complexity in the configuration geometry and structural behaviour due to the creation of eccentricities between sloping elements. To aid understanding of the primary behaviour of space structures composed of MSE circuits, an investigation was carried out where predicted behaviour using numerical modelling was compared to observed and recorded behaviour from experimental testing. In particular, the investigation focused on the structural behaviour of a MSE dodecahedric space structure under applied static loading. Global linear elastic analyses were carried out. Displacements and the stresses developed in one of the most heavily loaded module circuits were also investigated. For the loading regime and structural configuration considered, predicted combined axial, shear and torsional stresses were found to be low, implying that the primary action in the module elements was due to bending. Linear elastic analyses of Finite element (FE) models of the selected module circuit were also carried out. Two FE model types were considered. A number of arrangements were found to be possible when modelling the support connections between the elements. The FE models predicted that the onset of local yielding would occur in the areas adjacent to the bolted connection positions.

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