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 Available online at www.sciencedirect.com ScienceDirect

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

ScienceDirect

Procedia Structural Integrity 64 (2024) 799–806

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Identification of pre-tensioning of rebars based on the acoustoelastic effect Rui-Xin Jia a , Jin-Xin Long a , Yue Liu b,* Beijing University of Technology, 100 Pingleyuan, Beijing 100000, China. University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, China. Abstract Rebar as the core vertical prestressing stressing member of the bridge structure. The stress loss can not be effectively controlled during the whole process of anchorage, coupled with the influence of environmental corrosion. The result is that the vertical prestressing force cannot meet the design requirements, seriously threatening the durability and safety of the structure. This paper combines ultrasonic guided wave technology with acoustic elasticity theory to detect the effective prestressing of rebar. Guided wave propagation characteristics and acoustic elasticity effect under different tensile forces after bare rebar and outsourcing mortar are investigated. Tension tests and guided wave propagation tests were carried out on the specimens to analyze the variation rule between the first wave speed of guided waves and the tension force. The results show that the first wave speed of the guided wave decreases with the increase of the excitation frequency, which is consistent with the theoretical frequency dispersion curve. With the gradual increase of the excitation power, the amplitude of the guided waveform received by the rebar increases gradually only in the time and frequency domains. The law between first wave speed and tension after the outsourcing mortar is consistent with that of bare rebar. It is feasible to establish an identification method of prestressing rebar based on acoustoelastic effect. © 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 Identification of pre-tensioning of rebars based on the acoustoelastic effect Rui-Xin Jia a , Jin-Xin Long a , Yue Liu b,* Beijing University of Technology, 100 Pingleyuan, Beijing 100000, China. University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, China. Abstract Rebar as the core vertical prestressing stressing member of the bridge structure. The stress loss can not be effectively controlled during the whole process of anchorage, coupled with the influence of environmental corrosion. The result is that the vertical prestressing force cannot meet the design requirements, seriously threatening the durability and safety of the structure. This paper combines ultrasonic guided wave technology with acoustic elasticity theory to detect the effective prestressing of rebar. Guided wave propagation characteristics and acoustic elasticity effect under different tensile forces after bare rebar and outsourcing mortar are investigated. Tension tests and guided wave propagation tests were carried out on the specimens to analyze the variation rule between the first wave speed of guided waves and the tension force. The results show that the first wave speed of the guided wave decreases with the increase of the excitation frequency, which is consistent with the theoretical frequency dispersion curve. With the gradual increase of the excitation power, the amplitude of the guided waveform received by the rebar increases gradually only in the time and frequency domains. The law between first wave speed and tension after the outsourcing mortar is consistent with that of bare rebar. It is feasible to establish an identification method of prestressing rebar based on acoustoelastic effect. © 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: Rebar; Ultrasonic guided wave; Outsourcing mortar; Experimental study; Acoustoelastic effect Keywords: Rebar; Ultrasonic guided wave; Outsourcing mortar; Experimental study; Acoustoelastic effect

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: yueliu@ustb.edu.cn (Yue Liu) * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: yueliu@ustb.edu.cn (Yue Liu)

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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