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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Form Finding & Optimization

Structural optimization of a shell bridge built with the Pneumatic Forming of Hardened Concrete construction method

< Table of Contents for Form Finding & Optimization
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Form Finding & Optimization
  • Pages: 10
  • Title: Structural optimization of a shell bridge built with the Pneumatic Forming of Hardened Concrete construction method
  • Author(s): Thomas Pachner, Benjamin Kromoser, Johann Kollegger
  • Keywords: form finding, optimization, concrete shells, membrane structures, flat starting plate, pneumatic formwork
Abstract
Concrete shells designed according to the flow of forces are very efficient structures. The basic problem is that the costs for formwork and falsework have made these fascinating structures less and less economical to build. A new construction technology called Pneumatic Forming of Hardened Concrete (PFHC) was invented at the TU Vienna managing the construction process completely without formwork and falsework. A pneumatic formwork lifts a flat hardened concrete plate and at the same time additional post-tensioning cables are tightened to support the bending process of the flat plate into a semi-discrete surface resembling a double curved shell. A very challenging task is to design a concrete shell according to the impacting forces and to the boundary conditions needed for PFHC. In the present paper the geometry optimization for the construction of a deer pass over a two-track rail will be explained.

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