Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets

Hailong Gong, Lewei Tong, Xiao-Ling Zhao, Yuguang Fu

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

This paper presents an experimental investigation on CFRP strengthening of severely fatigue damaged SRC (steel-reinforced concrete) beams. Bending tests were carried out on three types of SRC beams: (1) SRC beams without any damage, (2) damaged SRC beams repaired by welding and (3) damaged SRC beams repaired by welding and CFRP. Failure modes of different types of SRC beams were compared. The effects of fatigue loading history and CFRP on static performance of SRC beams were studied. The experimental results showed that, for the fatigue damaged SRC beams, flexural bearing capacity can be restored if they were repaired by welding fractured beams and re-bars even without CFRP sheets, but the plastic strengthening of encased steel is weakened. CFRP sheets can effectively increase the ultimate flexural bearing capacity and overall stiffness of SRC beams. Meanwhile, it can delay crack propagation, reduce the width of surface cracks, and decrease the deflection under yield load and ultimate load. Finally, the strength of CFRP sheets will be fully utilized by using end anchorages.

Original languageEnglish
Title of host publicationProceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013)
Subtitle of host publicationMelbourne Vic Australia; 11-13 December 2013
EditorsRiadh Al-Mahaidi, Scott T. Smith, Yu Bai, Xiao-Ling Zhao
Place of PublicationMelbourne Vic Australia
PublisherInternational Institute for FRP in Construction (IIFC)
Pages1-6
Number of pages6
ISBN (Electronic)9780987593016
ISBN (Print)9780987593016
Publication statusPublished - 2013
EventAsia-Pacific Conference on FRP in Structures 2013 - Melbourne, Australia
Duration: 11 Dec 201313 Dec 2013
Conference number: 4th

Conference

ConferenceAsia-Pacific Conference on FRP in Structures 2013
Abbreviated titleAPFIS 2013
CountryAustralia
CityMelbourne
Period11/12/1313/12/13

Cite this

Gong, H., Tong, L., Zhao, X-L., & Fu, Y. (2013). Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets. In R. Al-Mahaidi, S. T. Smith, Y. Bai, & X-L. Zhao (Eds.), Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013): Melbourne Vic Australia; 11-13 December 2013 (pp. 1-6). Melbourne Vic Australia: International Institute for FRP in Construction (IIFC).
Gong, Hailong ; Tong, Lewei ; Zhao, Xiao-Ling ; Fu, Yuguang. / Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets. Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013): Melbourne Vic Australia; 11-13 December 2013. editor / Riadh Al-Mahaidi ; Scott T. Smith ; Yu Bai ; Xiao-Ling Zhao. Melbourne Vic Australia : International Institute for FRP in Construction (IIFC), 2013. pp. 1-6
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abstract = "This paper presents an experimental investigation on CFRP strengthening of severely fatigue damaged SRC (steel-reinforced concrete) beams. Bending tests were carried out on three types of SRC beams: (1) SRC beams without any damage, (2) damaged SRC beams repaired by welding and (3) damaged SRC beams repaired by welding and CFRP. Failure modes of different types of SRC beams were compared. The effects of fatigue loading history and CFRP on static performance of SRC beams were studied. The experimental results showed that, for the fatigue damaged SRC beams, flexural bearing capacity can be restored if they were repaired by welding fractured beams and re-bars even without CFRP sheets, but the plastic strengthening of encased steel is weakened. CFRP sheets can effectively increase the ultimate flexural bearing capacity and overall stiffness of SRC beams. Meanwhile, it can delay crack propagation, reduce the width of surface cracks, and decrease the deflection under yield load and ultimate load. Finally, the strength of CFRP sheets will be fully utilized by using end anchorages.",
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Gong, H, Tong, L, Zhao, X-L & Fu, Y 2013, Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets. in R Al-Mahaidi, ST Smith, Y Bai & X-L Zhao (eds), Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013): Melbourne Vic Australia; 11-13 December 2013. International Institute for FRP in Construction (IIFC), Melbourne Vic Australia, pp. 1-6, Asia-Pacific Conference on FRP in Structures 2013, Melbourne, Australia, 11/12/13.

Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets. / Gong, Hailong; Tong, Lewei; Zhao, Xiao-Ling; Fu, Yuguang.

Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013): Melbourne Vic Australia; 11-13 December 2013. ed. / Riadh Al-Mahaidi; Scott T. Smith; Yu Bai; Xiao-Ling Zhao. Melbourne Vic Australia : International Institute for FRP in Construction (IIFC), 2013. p. 1-6.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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N2 - This paper presents an experimental investigation on CFRP strengthening of severely fatigue damaged SRC (steel-reinforced concrete) beams. Bending tests were carried out on three types of SRC beams: (1) SRC beams without any damage, (2) damaged SRC beams repaired by welding and (3) damaged SRC beams repaired by welding and CFRP. Failure modes of different types of SRC beams were compared. The effects of fatigue loading history and CFRP on static performance of SRC beams were studied. The experimental results showed that, for the fatigue damaged SRC beams, flexural bearing capacity can be restored if they were repaired by welding fractured beams and re-bars even without CFRP sheets, but the plastic strengthening of encased steel is weakened. CFRP sheets can effectively increase the ultimate flexural bearing capacity and overall stiffness of SRC beams. Meanwhile, it can delay crack propagation, reduce the width of surface cracks, and decrease the deflection under yield load and ultimate load. Finally, the strength of CFRP sheets will be fully utilized by using end anchorages.

AB - This paper presents an experimental investigation on CFRP strengthening of severely fatigue damaged SRC (steel-reinforced concrete) beams. Bending tests were carried out on three types of SRC beams: (1) SRC beams without any damage, (2) damaged SRC beams repaired by welding and (3) damaged SRC beams repaired by welding and CFRP. Failure modes of different types of SRC beams were compared. The effects of fatigue loading history and CFRP on static performance of SRC beams were studied. The experimental results showed that, for the fatigue damaged SRC beams, flexural bearing capacity can be restored if they were repaired by welding fractured beams and re-bars even without CFRP sheets, but the plastic strengthening of encased steel is weakened. CFRP sheets can effectively increase the ultimate flexural bearing capacity and overall stiffness of SRC beams. Meanwhile, it can delay crack propagation, reduce the width of surface cracks, and decrease the deflection under yield load and ultimate load. Finally, the strength of CFRP sheets will be fully utilized by using end anchorages.

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BT - Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013)

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PB - International Institute for FRP in Construction (IIFC)

CY - Melbourne Vic Australia

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Gong H, Tong L, Zhao X-L, Fu Y. Experimental investigation on static flexural behavior of fatigue damaged SRC beams strengthened with CFRP sheets. In Al-Mahaidi R, Smith ST, Bai Y, Zhao X-L, editors, Proceedings of the 4th Asia-Pacfic Conference on FRP in Structures (APFIS 2013): Melbourne Vic Australia; 11-13 December 2013. Melbourne Vic Australia: International Institute for FRP in Construction (IIFC). 2013. p. 1-6