PSI - Issue 64

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

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

ScienceDirect

Procedia Structural Integrity 64 (2024) 515–522

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Self-Sensing Strands and Their Application in Prestressed Concrete Box Girders Mingyang Xi a , Yue Liu a *, Shi Bai b a School of Civil and Resources Engineering, University of Science and Technology Beijing, No.30 College Road, Haidian District, Beijing 100083, China b Zhixing FRP Reinforcement Nantong CO., Ltd., No. 60, Chongzhou Avenue, Development Zone, Nantong 226001, China Abstract Strands are widely used in prestressed concrete structures such as buildings, bridges, and dams. Traditional strands can only meet the structural stress requirements, but the long-term and effective monitoring of their stress state, leading to soaring maintenance costs, imposes a significant economic burden on operating units. In response, this paper studies the application of self-sensing strands in prestressed concrete bridges. Firstly, a new type of self-sensing strand properties is proposed, including its design and encapsulation process. Secondly, the designed self-sensing strand is applied to a prestressed concrete box girder bridge on a certain highway for verification analysis. Lastly, the prestress loss during the construction and maintenance stages of this box girder bridge is monitored. The results show that the prestress loss is minimal within the first 24 hours of box girder prefabrication and during the grouting stage of anchorage, with an average prestress loss of 0.43 KN, consistent with structural characteristics. The tension of the four strands inside the concrete box girder during the maintenance period ranged from 186 to 194 KN, all exceeding 95% of the locking force, meeting the design requirements. This proves that prestressed self-sensing strands can effectively monitor prestress loss while ensuring structural stability and safety, significantly reducing maintenance costs. It also provides reliable support for the intelligent operation and long-term health monitoring of bridge structures. © 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 SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Self-Sensing Strands and Their Application in Prestressed Concrete Box Girders Mingyang Xi a , Yue Liu a *, Shi Bai b a School of Civil and Resources Engineering, University of Science and Technology Beijing, No.30 College Road, Haidian District, Beijing 100083, China b Zhixing FRP Reinforcement Nantong CO., Ltd., No. 60, Chongzhou Avenue, Development Zone, Nantong 226001, China Abstract Strands are widely used in prestressed concrete structures such as buildings, bridges, and dams. Traditional strands can only meet the structural stress requirements, but the long-term and effective monitoring of their stress state, leading to soaring maintenance costs, imposes a significant economic burden on operating units. In response, this paper studies the application of self-sensing strands in prestressed concrete bridges. Firstly, a new type of self-sensing strand properties is proposed, including its design and encapsulation process. Secondly, the designed self-sensing strand is applied to a prestressed concrete box girder bridge on a certain highway for verification analysis. Lastly, the prestress loss during the construction and maintenance stages of this box girder bridge is monitored. The results show that the prestress loss is minimal within the first 24 hours of box girder prefabrication and during the grouting stage of anchorage, with an average prestress loss of 0.43 KN, consistent with structural characteristics. The tension of the four strands inside the concrete box girder during the maintenance period ranged from 186 to 194 KN, all exceeding 95% of the locking force, meeting the design requirements. This proves that prestressed self-sensing strands can effectively monitor prestress loss while ensuring structural stability and safety, significantly reducing maintenance costs. It also provides reliable support for the intelligent operation and long-term health monitoring of bridge structures. © 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 © 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: Self-sensing strands, Prestressed reinforced concrete structure, Health monitoring, Prestress loss, Technological research. Keywords: Self-sensing strands, Prestressed reinforced concrete structure, Health monitoring, Prestress loss, Technological research.

* Corresponding author. Tel.: +86 17812387863 E-mail address: yueliu@ustb.edu.cn * Corresponding author. Tel.: +86 17812387863 E-mail address: yueliu@ustb.edu.cn

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 Organizer 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 Organizer

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