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) 1865–1872

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Numerical analysis of SCF of Tubular T-joints strengthened with prestressed CFRP Yuan Xu a , Qian-Qian Yu a, *, Guo-Wen Xu b,c a Tongji University, Shanghai 200092, China b China Construction Eighth Engineering Division Co., Ltd., Shanghai 200122, China c Shanghai Engineering Research Center of CFRP Application Technology in Civil Engineering ， Shanghai 200122, China Abstract Fatigue failure is one of the main concerns of welded tubular joints owing to inevitable welding defects and severe stress concentration along the intersection. In addition, the complex geometry of the joint makes it inconvenient to reinforce by traditional repair methods. Carbon fiber-reinforced polymer (CFRP) composite has been widely used for structural strengthening due to superior strength-to-weight ratio, good fatigue and corrosion resistance, as well as ease of installation. Although tubular joints strengthened by using non-prestressed CFRP sheets have been investigated in references, application of prestressed CFRP has not been reported. This study proposed a form of prestressed CFRP sheets for the fatigue strengthening of tubular T-joints. Three dimensional finite element models were developed for both CFRP-strengthened and unstrengthened tubular T-joints to calculate the hot spot stress distribution, which was verified using experimental test data and Lloyd’s Register (LR) equations. A parametric study was then carried out to explore effects of CFRP strengthening parameters on the SCF reduction coefficient ψ , including the prestressing level ( p ), CFRP width ( w ), and CFRP layers ( n ). It was found that prestressing CFRP changed the stress distribution and values along the weld toe. With the increase of prestress, the position of the maximum stress gradually moved from the saddle point to the crown point. Besides, the strengthening parameters had significant effects on reduction of the hot spot stress along the weld toe. © 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: Prestressed CFRP, CFRP strengthening, Circular hollow section T-joints, Finite element analysis, SCF reduction coefficient SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Numerical analysis of SCF of Tubular T-joints strengthened with prestressed CFRP Yuan Xu a , Qian-Qian Yu a, *, Guo-Wen Xu b,c a Tongji University, Shanghai 200092, China b China Construction Eighth Engineering Division Co., Ltd., Shanghai 200122, China c Shanghai Engineering Research Center of CFRP Application Technology in Civil Engineering ， Shanghai 200122, China Abstract Fatigue failure is one of the main concerns of welded tubular joints owing to inevitable welding defects and severe stress concentration along the intersection. In addition, the complex geometry of the joint makes it inconvenient to reinforce by traditional repair methods. Carbon fiber-reinforced polymer (CFRP) composite has been widely used for structural strengthening due to superior strength-to-weight ratio, good fatigue and corrosion resistance, as well as ease of installation. Although tubular joints strengthened by using non-prestressed CFRP sheets have been investigated in references, application of prestressed CFRP has not been reported. This study proposed a form of prestressed CFRP sheets for the fatigue strengthening of tubular T-joints. Three dimensional finite element models were developed for both CFRP-strengthened and unstrengthened tubular T-joints to calculate the hot spot stress distribution, which was verified using experimental test data and Lloyd’s Register (LR) equations. A parametric study was then carried out to explore effects of CFRP strengthening parameters on the SCF reduction coefficient ψ , including the prestressing level ( p ), CFRP width ( w ), and CFRP layers ( n ). It was found that prestressing CFRP changed the stress distribution and values along the weld toe. With the increase of prestress, the position of the maximum stress gradually moved from the saddle point to the crown point. Besides, the strengthening parameters had significant effects on reduction of the hot spot stress along the weld toe. © 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: Prestressed CFRP, CFRP strengthening, Circular hollow section T-joints, Finite element analysis, SCF reduction coefficient © 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.: +86-21-65982928; fax: +86-21-65982928. E-mail address: qianqian.yu@tongji.edu.cn * Corresponding author. Tel.: +86-21-65982928; fax: +86-21-65982928. E-mail address: qianqian.yu@tongji.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 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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