Log In    |    Join IASS    |    Online Journal    |    Proceedings    |    Directory    |    Events    |    News

Online IASS Proceedings

IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints


IASS Symposium 2014

SESSION: Structural Morphology 2: Methods for Thin Shells

Controlling the geometry and forces of a hybrid cable-net and fabric formwork for thin concrete shells

< Table of Contents for Structural Morphology 2: Methods for Thin Shells
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: Structural Morphology 2: Methods for Thin Shells
  • Title: Controlling the geometry and forces of a hybrid cable-net and fabric formwork for thin concrete shells
  • Author(s): Diederik VEENENDAAL, Mile BEZBRADICA, David NOVÁK, Philippe BLOCK
  • Keywords: Shell structure, cable net, fabric formwork, flexible formwork, photogrammetry
Abstract
The construction of anticlastic, thin-shell concrete structures can be efficiently achieved through the use of flexible formworks. Such formworks allow a departure from the traditional hyperbolic paraboloid shells, where its ruled surface serves as the basis for straight-line timber formworks. In addition, as forces are carried by the tensile system to the outer boundaries, the amount of falsework and their foundations, is heavily reduced, leading to economy in material, transportation and storage. This paper presents a prototype hybrid cable-net and fabric formwork used for the construction of two shell structures with identical boundary conditions. The second prototype, which is the main focus of this paper, was constructed after introducing several constructional variations and improvements. Moreover, it was constructed to test more accurate and flexible approaches to measuring both the geometry and internal forces of the cable net. This, in turn, allowed a higher degree of control of the applied prestresses, thus leading to lower tolerances between the digital form-finding model and the physical, as-built geometry.

Read the complete paper (pdf) (requires membership)
© IASS All rights reserved.
IASS · CEDEX - Laboratorio Central de Estructuras y Materiales · C/ Alfonso XII, 3 · 28014 Madrid, Spain     tel. 34 91 335-7409; fax: 335-7422
Site Design & Programming
by World Design Group, Inc.