A design methodology to reduce the embodied carbon of concrete buildings using thin-shell floors

Research output: Contribution to journalArticle

Abstract

This paper explores the potential of thin concrete shells low-carbon alternatives to floor slabs and beams, which typically make up the majority of structural material in multi-storey buildings. A simple and practical system is proposed, featuring pre-cast textile reinforced concrete shells with a network of prestressed steel tension ties. A non-structural fill is included to provide a level top surface. Building on previous experimental and theoretical work, a complete design methodology is presented. This is then used to explore the structural behaviour of the proposed system, refine its design, and evaluate potential carbon savings.

Compared to flat slabs of equivalent structural performance, significant embodied carbon reductions (53-58%) are demonstrated across spans of 6-18m. Self-weight reductions of 43-53% are also achieved, which would save additional material in columns and foundations. The simplicity of the proposed structure, and conservatism of the design methodology, indicate that further savings could be made with future refinements.

These results show that considerable embodied carbon reductions are possible through innovative structural design, and that thin-shell floors are a practical means of achieving this.
Original languageEnglish
JournalEngineering Structures
Publication statusAccepted/In press - 8 Jan 2020

Keywords

  • Concrete shells
  • Structural optimisation
  • Textile reinforced concrete
  • Floor structures
  • Embodied carbon
  • Low-carbon buildings

Cite this

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title = "A design methodology to reduce the embodied carbon of concrete buildings using thin-shell floors",
abstract = "This paper explores the potential of thin concrete shells low-carbon alternatives to floor slabs and beams, which typically make up the majority of structural material in multi-storey buildings. A simple and practical system is proposed, featuring pre-cast textile reinforced concrete shells with a network of prestressed steel tension ties. A non-structural fill is included to provide a level top surface. Building on previous experimental and theoretical work, a complete design methodology is presented. This is then used to explore the structural behaviour of the proposed system, refine its design, and evaluate potential carbon savings.Compared to flat slabs of equivalent structural performance, significant embodied carbon reductions (53-58{\%}) are demonstrated across spans of 6-18m. Self-weight reductions of 43-53{\%} are also achieved, which would save additional material in columns and foundations. The simplicity of the proposed structure, and conservatism of the design methodology, indicate that further savings could be made with future refinements.These results show that considerable embodied carbon reductions are possible through innovative structural design, and that thin-shell floors are a practical means of achieving this.",
keywords = "Concrete shells, Structural optimisation, Textile reinforced concrete, Floor structures, Embodied carbon, Low-carbon buildings",
author = "Will Hawkins and John Orr and Tim Ibell and Paul Shepherd",
year = "2020",
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language = "English",
journal = "Engineering Structures",
issn = "0141-0296",
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T1 - A design methodology to reduce the embodied carbon of concrete buildings using thin-shell floors

AU - Hawkins, Will

AU - Orr, John

AU - Ibell, Tim

AU - Shepherd, Paul

PY - 2020/1/8

Y1 - 2020/1/8

N2 - This paper explores the potential of thin concrete shells low-carbon alternatives to floor slabs and beams, which typically make up the majority of structural material in multi-storey buildings. A simple and practical system is proposed, featuring pre-cast textile reinforced concrete shells with a network of prestressed steel tension ties. A non-structural fill is included to provide a level top surface. Building on previous experimental and theoretical work, a complete design methodology is presented. This is then used to explore the structural behaviour of the proposed system, refine its design, and evaluate potential carbon savings.Compared to flat slabs of equivalent structural performance, significant embodied carbon reductions (53-58%) are demonstrated across spans of 6-18m. Self-weight reductions of 43-53% are also achieved, which would save additional material in columns and foundations. The simplicity of the proposed structure, and conservatism of the design methodology, indicate that further savings could be made with future refinements.These results show that considerable embodied carbon reductions are possible through innovative structural design, and that thin-shell floors are a practical means of achieving this.

AB - This paper explores the potential of thin concrete shells low-carbon alternatives to floor slabs and beams, which typically make up the majority of structural material in multi-storey buildings. A simple and practical system is proposed, featuring pre-cast textile reinforced concrete shells with a network of prestressed steel tension ties. A non-structural fill is included to provide a level top surface. Building on previous experimental and theoretical work, a complete design methodology is presented. This is then used to explore the structural behaviour of the proposed system, refine its design, and evaluate potential carbon savings.Compared to flat slabs of equivalent structural performance, significant embodied carbon reductions (53-58%) are demonstrated across spans of 6-18m. Self-weight reductions of 43-53% are also achieved, which would save additional material in columns and foundations. The simplicity of the proposed structure, and conservatism of the design methodology, indicate that further savings could be made with future refinements.These results show that considerable embodied carbon reductions are possible through innovative structural design, and that thin-shell floors are a practical means of achieving this.

KW - Concrete shells

KW - Structural optimisation

KW - Textile reinforced concrete

KW - Floor structures

KW - Embodied carbon

KW - Low-carbon buildings

M3 - Article

JO - Engineering Structures

JF - Engineering Structures

SN - 0141-0296

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