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) 2021–2027

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Ni-Ti SMA Bars in Bridge Engineering- Research and New SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Ni-Ti SMA Bars in Bridge Engineering- Research and New

Development M. Saiid Saiidi* University of Nevada, Reno Development M. Saiid Saiidi* University of Nevada, Reno

Abstract The highlights of many research projects are presented discussing the evolution of studies on Nickel-Titanium (NiTi) superelastic shape memory alloy bars that eventually led to their deployment in an actual bridge in Seattle, Washington, USA. The paper also briefly describes a new generation of SMA (shape memory alloy) bars that incorporate Cobalt (NiTiCo) and the related ongoing research to tap into its relatively high strength. The key questions that were answered through research on NiTi were if the superelasticity of NiTi is passed on to NiTi-reinforced beams. This followed by the recentering capability that these bars could provide to concrete members subjected to cyclic loads. Other important issues discussed in the paper are the connections of the bars to mild steel reinforcement, measures to avoid material waste by using the full bar diameter rather than machining the diameter to dog bone shape, and development of large diameter bars that are appropriate for use in actual bridge columns. © 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: Bridges; concrete; ECC; engineered cementitious composites; NiTiCo; Nickel-Titanium; sesimic; shape memory alloys; superelastic 1. Introduction The civil engineering profession has been continuously but cautiously in search of means to improve design, construction, delivery, and performance of built facilities such as structures, roads, dams, etc. The cautious approach has been the reason for changes in the civil engineering practice being incremental and relatively slow compared to other fields of engineering. Much can be discussed about the reasons behind this trend, but the general driving factors Abstract The highlights of many research projects are presented discussing the evolution of studies on Nickel-Titanium (NiTi) superelastic shape memory alloy bars that eventually led to their deployment in an actual bridge in Seattle, Washington, USA. The paper also briefly describes a new generation of SMA (shape memory alloy) bars that incorporate Cobalt (NiTiCo) and the related ongoing research to tap into its relatively high strength. The key questions that were answered through research on NiTi were if the superelasticity of NiTi is passed on to NiTi-reinforced beams. This followed by the recentering capability that these bars could provide to concrete members subjected to cyclic loads. Other important issues discussed in the paper are the connections of the bars to mild steel reinforcement, measures to avoid material waste by using the full bar diameter rather than machining the diameter to dog bone shape, and development of large diameter bars that are appropriate for use in actual bridge columns. © 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: Bridges; concrete; ECC; engineered cementitious composites; NiTiCo; Nickel-Titanium; sesimic; shape memory alloys; superelastic 1. Introduction The civil engineering profession has been continuously but cautiously in search of means to improve design, construction, delivery, and performance of built facilities such as structures, roads, dams, etc. The cautious approach has been the reason for changes in the civil engineering practice being incremental and relatively slow compared to other fields of engineering. Much can be discussed about the reasons behind this trend, but the general driving factors © 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

* Corresponding author. Tel.: 0017753383758 E-mail address: saiidi@unr.edu * Corresponding author. Tel.: 0017753383758 E-mail address: saiidi@unr.edu

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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