Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Digitally fabricated weak interfaces to reduce minimum reinforcement in concrete structures
[EN] Crack initiators in reinforced concrete structures can facilitate fulfilling the serviceability requirements. They can be used as a design parameter to diminish the minimum reinforcement for members subject to imposed deformation and exposed to the environment as they reduce the crack spacing and width when arranged close enough. While crack initiators in conventional concrete construction are cumbersome to provide (e.g., by construction joints or taperings), they are inherent to layered extrusion processes with digital fabrication technologies: the tensile strength is typically reduced locally in interfaces between layers. Rather than trying to avoid these weak interfaces, this paper discusses the potential of taking advantage of them to act as crack initiators reducing the minimum reinforcement content. A tension chord-based model is developed to (i) account for the local strength reduction and (ii) predict the effect of weak interfaces on the expected crack spacing and width. As a key finding, the model predicts a reduction of the required minimum reinforcement ratio proportional to the locally decreased concrete tensile strength for a specified maximum crack width requirement under imposed deformations. An experimental campaign on five layered and three reference tension ties confirmed the clearly positive impact of weak interfaces on crack spacings and widths. ; The authors express their gratitude to Lex Reiter (IFB, ETH Zuerich) for his indispensable support in planning and conducting the experiments. This research is supported by the National Centre for Competence in Research in Digital Fabrication in Architecture, funded by the Swiss National Science Foundation (project number 51NF40 141853). ; Bichof, P.; Mata Falcon, J.; Ammann, R.; Näsbom, A.; Kaufmann, W. (2023). Digitally fabricated weak interfaces to reduce minimum reinforcement in concrete structures. Structural Concrete. 24(2):1835-1855. https://doi.org/10.1002/suco.202200732 ; 1835 ; 1855 ; 24 ; 2
Digitally fabricated weak interfaces to reduce minimum reinforcement in concrete structures
[EN] Crack initiators in reinforced concrete structures can facilitate fulfilling the serviceability requirements. They can be used as a design parameter to diminish the minimum reinforcement for members subject to imposed deformation and exposed to the environment as they reduce the crack spacing and width when arranged close enough. While crack initiators in conventional concrete construction are cumbersome to provide (e.g., by construction joints or taperings), they are inherent to layered extrusion processes with digital fabrication technologies: the tensile strength is typically reduced locally in interfaces between layers. Rather than trying to avoid these weak interfaces, this paper discusses the potential of taking advantage of them to act as crack initiators reducing the minimum reinforcement content. A tension chord-based model is developed to (i) account for the local strength reduction and (ii) predict the effect of weak interfaces on the expected crack spacing and width. As a key finding, the model predicts a reduction of the required minimum reinforcement ratio proportional to the locally decreased concrete tensile strength for a specified maximum crack width requirement under imposed deformations. An experimental campaign on five layered and three reference tension ties confirmed the clearly positive impact of weak interfaces on crack spacings and widths. ; The authors express their gratitude to Lex Reiter (IFB, ETH Zuerich) for his indispensable support in planning and conducting the experiments. This research is supported by the National Centre for Competence in Research in Digital Fabrication in Architecture, funded by the Swiss National Science Foundation (project number 51NF40 141853). ; Bichof, P.; Mata Falcon, J.; Ammann, R.; Näsbom, A.; Kaufmann, W. (2023). Digitally fabricated weak interfaces to reduce minimum reinforcement in concrete structures. Structural Concrete. 24(2):1835-1855. https://doi.org/10.1002/suco.202200732 ; 1835 ; 1855 ; 24 ; 2
Digitally fabricated weak interfaces to reduce minimum reinforcement in concrete structures
Bichof, Patrick (Autor:in) / Mata Falcon, Jaime (Autor:in) / Ammann, Rebecca (Autor:in) / Näsbom, Andreas (Autor:in) / Kaufmann, Walter (Autor:in) / Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos - Escola Tècnica Superior d'Enginyers de Camins, Canals i Ports / Swiss National Science Foundation
01.04.2023
doi:10.1002/suco.202200732
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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