PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 1176–1183

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Digital Fabrication of Segmental Concrete Columns Prestressed with Iron-based Shape Memory Alloy Bars for Accelerated Bridge Construction Saim Raza a * , Zafiris Triantafyllidis a , Ana Anton b , Benjamin Dillenburger b , Moslem Shahverdi a Abstract The combination of digital fabrication technology and prestressed segmental column construction holds great promise for the accelerated construction of bridges with material-efficient design. This study aims to explore this potential by introducing an innovative prestressed segmental column system that utilizes 3D printed concrete (3DPC) formwork and iron-based shape memory alloy (Fe-SMA) reinforcement for prestressing. To evaluate the proposed system's performance, large-scale experiments were conducted on two columns subjected to gravity and lateral loads. The experimental findings demonstrated that the columns were capable of withstanding lateral drifts of up to 5% without collapsing, and the 3DPC formwork exhibited no signs of premature failure or delamination. Additionally, the columns displayed self-centering characteristics, maintaining a residual drift of less than 1% up to a target drift of 3%. These results showcase the potential of the proposed prefabrication concept, which can enable the design of bridge columns that are both material-efficient and resilient to seismic actions © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Digital fabrication, 3D concrete printing, segmental column construction, Fe-SMA prestressing SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Digital Fabrication of Segmental Concrete Columns Prestressed with Iron-based Shape Memory Alloy Bars for Accelerated Bridge Construction Saim Raza a * , Zafiris Triantafyllidis a , Ana Anton b , Benjamin Dillenburger b , Moslem Shahverdi a a Empa, Ueberlandstrasse 129, Dubendorf, 8600, Switzerland b ETH Zurich, Stefano-Franscini-Platz 1, Zürich 8093, Switzerland Abstract The combination of digital fabrication technology and prestressed segmental column construction holds great promise for the accelerated construction of bridges with material-efficient design. This study aims to explore this potential by introducing an innovative prestressed segmental column system that utilizes 3D printed concrete (3DPC) formwork and iron-based shape memory alloy (Fe-SMA) reinforcement for prestressing. To evaluate the proposed system's performance, large-scale experiments were conducted on two columns subjected to gravity and lateral loads. The experimental findings demonstrated that the columns were capable of withstanding lateral drifts of up to 5% without collapsing, and the 3DPC formwork exhibited no signs of premature failure or delamination. Additionally, the columns displayed self-centering characteristics, maintaining a residual drift of less than 1% up to a target drift of 3%. These results showcase the potential of the proposed prefabrication concept, which can enable the design of bridge columns that are both material-efficient and resilient to seismic actions © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Digital fabrication, 3D concrete printing, segmental column construction, Fe-SMA prestressing 1. Introduction The use of precast concrete in bridge construction has seen a notable increase recently due to its benefits, such as © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers a Empa, Ueberlandstrasse 129, Dubendorf, 8600, Switzerland b ETH Zurich, Stefano-Franscini-Platz 1, Zürich 8093, Switzerland 1. Introduction The use of precast concrete in bridge construction has seen a notable increase recently due to its benefits, such as

* Corresponding author. Tel.: +41 58 765 4726; fax: +058 765 6955. E-mail address: saim.raza@empa.ch * Corresponding author. Tel.: +41 58 765 4726; fax: +058 765 6955. E-mail address: saim.raza@empa.ch

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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