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  4. Design and exploration of externally post-tensioned structures using graphic statics
 
conference paper

Design and exploration of externally post-tensioned structures using graphic statics

Todisco, Leonardo
•
Fivet, Corentin  
•
Corres Peiretti, Hugo
Show more
Coenders, Jeroen
2015
Proceedings of the International Association for Shell and Spatial Structures (IASS) Symposium 2015
International Association for Shell and Spatial Structures (IASS) Symposium 2015

Funicular structures, which follow the shapes of hanging chains, work in pure tension (cables) or pure compression (arches), and offer a materially efficient solution compared to structures that work through bending action. However, the set of geometries that are funicular under common loading conditions is limited. Non-structural design criteria, such as function, program, and aesthetics, often prohibit the selection of purely funicular shapes, resulting in large bending moments and excess material usage. In response to this issue, this paper explores the use of a new design approach that converts non-funicular planar curves into funicular shapes without changing the geometry; instead, funicularity is achieved through the introduction of new loads using external post-tensioning. The methodology is based on graphic statics, and is generalized for any two-dimensional shape. The problem is indeterminate, meaning that a large range of allowable solutions is possible for one initial geometry. Each solution within this range results in different internal force distributions and horizontal reactions. The method has been implemented in an interactive parametric design environment, empowering fast exploration of diverse axial-only solutions. In addition to presenting the approach and tool, this paper provides a series of case studies and numerical comparisons between new post-tensioned structures and classical bending solutions, demonstrating that significant material can be saved without compromising on geometrical requirements.

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Type
conference paper
Author(s)
Todisco, Leonardo
Fivet, Corentin  
Corres Peiretti, Hugo
Mueller, Caitlin
Editors
Coenders, Jeroen
Date Issued

2015

Publisher

IASS

Publisher place

Amsterdam

Published in
Proceedings of the International Association for Shell and Spatial Structures (IASS) Symposium 2015
ISBN of the book

978-9-053630-42-6

Subjects

equilibrium

•

graphic statics

•

structural design

•

post-tensioning system

•

geometry

•

funicular structures

•

design methods

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
SXL  
Event nameEvent placeEvent date
International Association for Shell and Spatial Structures (IASS) Symposium 2015

Amsterdam, The Netherlands

August 17-20, 2015

Available on Infoscience
June 15, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/126687
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