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Open AccessArticle

Experimental Research on Bond Behavior between GFRP Bars and Stirrups-Confined Concrete

Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, China
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Appl. Sci. 2019, 9(7), 1340; https://doi.org/10.3390/app9071340
Received: 21 February 2019 / Revised: 25 March 2019 / Accepted: 26 March 2019 / Published: 29 March 2019
(This article belongs to the Special Issue Emerging Construction Materials and Sustainable Infrastructure)
This paper presents the results of a series of pullout tests that were performed on Glass-fiber-reinforced polymer (GFRP) bars embedded in concrete, while providing a detailed report on the influence of various variables that impinge upon bond behavior, such as the surface characteristics and diameter of the bars, concrete strength, as well as the confined effect of stirrups. The Bertero-Popov-Eligehausen (BPE) and Cosenza-Manfredi-Realfonzo (CMR) models analyzed the bond stress (τ)–slip (s) relationship between GFRP bar and stirrups-confined concrete. The tests results indicate that when the bond failure interface only occurs on the surface of a GFRP bar, the bond strength is not dependent upon the concrete strength. Moreover, the results indicate that in comparison to specimens without stirrups, their stirrup-containing counterparts are more prone to pullout failure with greater ductility and higher bond strength and corresponding slip. The BPE and CMR models are able to investigate the τ-s relationship between GFRP bars and the stirrups-confined concrete with accuracy. With the experimental data, the specific parameters in the models classified by surface characteristics have been suggested. View Full-Text
Keywords: GFRP bar; pullout tests; stirrups-confined concrete; bond behavior; bond stress-slip relationship GFRP bar; pullout tests; stirrups-confined concrete; bond behavior; bond stress-slip relationship
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MDPI and ACS Style

Gao, K.; Li, Z.; Zhang, J.; Tu, J.; Li, X. Experimental Research on Bond Behavior between GFRP Bars and Stirrups-Confined Concrete. Appl. Sci. 2019, 9, 1340.

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