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Vol. 52 (2011) No. 4 December n. 170


Tsuboi Proceedings Award Paper for 2010: A Novel Form Finding Method for Fabric Formwork for Concrete Shells

< Table of Contents for Vol. 52 (2011) No. 4 December n. 170
  • 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. 52 (2011) No. 4 December n. 170
  • Pages: 217-224
  • Title: Tsuboi Proceedings Award Paper for 2010: A Novel Form Finding Method for Fabric Formwork for Concrete Shells
  • Author(s): T. Van Mele and P. Block
  • Keywords: Concrete shells, pre-stressed membrane formwork, form finding, Force Density Method, Thrust Network Approach
Abstract
This paper introduces a new form finding approach for the design of flexible formwork, consisting of pre-stressed structural membranes, for the construction of thin, anticlastic, concrete shells. The approach is based on the Force Density Method and an adaptation of the nonlinear extension of Thrust Network Analysis (TNA). First, the adaptation of the basic version of TNA to tension-only structures is discussed, and fundamental assumptions are formulated. Key aspects herein are the use of reciprocal diagrams and the control of forces in indeterminate networks. Then, the strategy using an overall optimization process, for finding the closest possible tension-only, equilibrium surface to a given target surface under the appropriate loading (i.e. weight of the concrete) is presented. Finally, the strategy is applied to a chosen target surface and loads, and the equilibrium solutions for different starting points of the optimization process are discussed.

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