Full-scale prototype of a cable-net and fabric formed concrete thin-shell roof

Méndez Echenagucia, T; Pigram, DA; Liew, A; Van Mele, T; Block, P

Full-scale prototype of a cable-net and fabric formed concrete thin-shell roof

Méndez Echenagucia, T Pigram, DA Liew, A Van Mele, T Block, P

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Publication Type:: Conference Proceeding
Citation:: Proceedings of the IASS Symposium 2018 Creativity in Structural Design, 2018
Issue Date:: 2018

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	IASS2018_FullPaper_152.pdf	Published version	26.86 MB	Adobe PDF	View/Open

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Field	Value	Language
dc.contributor.author	Méndez Echenagucia, T	en_US
dc.contributor.author	Pigram, DA	en_US
dc.contributor.author	Liew, A	en_US
dc.contributor.author	Van Mele, T	en_US
dc.contributor.author	Block, P	en_US
dc.contributor.editor	Adriaenssen, S	en_US
dc.contributor.editor	Mueller, C	en_US
dc.date	2018-07-16	en_US
dc.date.issued	2018	en_US
dc.identifier.citation	Proceedings of the IASS Symposium 2018 Creativity in Structural Design, 2018	en_US
dc.identifier.uri	http://hdl.handle.net/10453/133800
dc.description.abstract	This paper describes the construction of a thin shell concrete roof with a novel cable-net and fabric formwork system [1]. The construction of the shell was a proof-of-concept demonstration of the formwork system, showing that through appropriate cable-net component design, and an on-site shape control system [2], concrete shells with complex doubly curved geometry can be built efficiently and with minimal material waste. The formwork system works by installing a fabric shuttering on a cable-net structure tensioned from stiff boundary beams that are supported by standard scaffolding props. Starting from the lower support points, the concrete shell is sprayed on the flexible formwork from two aerial platforms in a carefully planned sequence. The cable-net is designed to deflect into the designed shape of the shell structure under the weight of the wet concrete. The cable-net nodes are specifically designed to hold the fabric shuttering and to fix the carbon fibre reinforcement at the correct depth in the concrete section. They also serve as an indicator for the variable thickness of the concrete during spraying. Due to construction tolerances and imperfections, the as-built shape of the cable-net is expected to deviate from the designed geometry. To minimise this deviation, an active control system is used. To reshape the cable-net, the cables on the boundary are tightened or loosened. Based on the measured geometry of the cable-net, a specifically designed control algorithm is used to find the set of adjustments necessary to achieve the desired shape.	en_US
dc.relation.ispartof	Proceedings of the IASS Symposium 2018 Creativity in Structural Design	en_US
dc.relation.ispartof	International Association for Shell and Spatial Structures	en_US
dc.title	Full-scale prototype of a cable-net and fabric formed concrete thin-shell roof	en_US
dc.type	Conference Proceeding
utslib.location.activity	Massachusetts Institute of Technology (MIT)	en_US
utslib.for	1201 Architecture	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building
pubs.organisational-group	/University of Technology Sydney/Faculty of Design, Architecture and Building/School of Architecture
pubs.organisational-group	/University of Technology Sydney/Strength - CCDP - Contemporary Design Practice
utslib.copyright.status	closed_access
pubs.consider-herdc	false	en_US
pubs.finish-date	2018-08-20	en_US
pubs.start-date	2018-07-16	en_US

Abstract:

This paper describes the construction of a thin shell concrete roof with a novel cable-net and fabric formwork system [1]. The construction of the shell was a proof-of-concept demonstration of the formwork system, showing that through appropriate cable-net component design, and an on-site shape control system [2], concrete shells with complex doubly curved geometry can be built efficiently and with minimal material waste. The formwork system works by installing a fabric shuttering on a cable-net structure tensioned from stiff boundary beams that are supported by standard scaffolding props. Starting from the lower support points, the concrete shell is sprayed on the flexible formwork from two aerial platforms in a carefully planned sequence. The cable-net is designed to deflect into the designed shape of the shell structure under the weight of the wet concrete. The cable-net nodes are specifically designed to hold the fabric shuttering and to fix the carbon fibre reinforcement at the correct depth in the concrete section. They also serve as an indicator for the variable thickness of the concrete during spraying. Due to construction tolerances and imperfections, the as-built shape of the cable-net is expected to deviate from the designed geometry. To minimise this deviation, an active control system is used. To reshape the cable-net, the cables on the boundary are tightened or loosened. Based on the measured geometry of the cable-net, a specifically designed control algorithm is used to find the set of adjustments necessary to achieve the desired shape.

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http://hdl.handle.net/10453/133800