Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP sheets

doi:10.1007/s11709-021-0787-8

Front. Struct. Civ. Eng.

2022, Vol. 16

Issue (1) : 131-143 https://doi.org/10.1007/s11709-021-0787-8

RESEARCH ARTICLE

Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP sheets

Mohammad R. IRSHIDAT(

), Rami S. AL-HUSBAN

Department of Civil Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan

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Abstract

This paper studied the effect of incorporation of carbon nanotubes (CNTs) in carbon fiber reinforced polymer (CFRP) on strengthening of reinforced concrete (RC) beams. The RC beams were prepared, strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets, and tested under four-point loading. The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP. A nonlinear finite element (FE) model was built, validated, and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP. The studied parameters included concrete strength, flexural reinforcement ratio, and CFRP sheet configuration. The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations. The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam. In case of using underside-strip, the longer or the wider the sheet, the higher was the flexural capacity of the beams. The flexural enhancement of RC beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

Keywords RC beams flexural strengthening CFRP CNTs finite element

Corresponding Author(s): Mohammad R. IRSHIDAT

Just Accepted Date: 07 December 2021 Online First Date: 21 January 2022 Issue Date: 07 March 2022

Cite this article:

Mohammad R. IRSHIDAT,Rami S. AL-HUSBAN. Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP sheets[J]. Front. Struct. Civ. Eng., 2022, 16(1): 131-143.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-021-0787-8
https://academic.hep.com.cn/fsce/EN/Y2022/V16/I1/131

Fig.1 (a) RC beam dimensions and reinforcements; (b) test setup and loading configuration.

Fig.2 Typical FE model of strengthened RC beams.

Fig.3 Constitutive models used for (a) concrete in compression; (b) steel rebars; (c) bond between concrete and CFRP.

Tab.1 Orthotropic mechanical properties for CFRP and CNTs- modified CFRP composites

Fig.4 Experimental versus FE results for control beam. (a) Cracks initiation; (b) cracks pattern.

Fig.5 Experimental versus FE results showing cracks initiation, cracks pattern and failure mode for beams strengthened with (a) CFRP and (b) CNTs-modified CFRP.

Tab.2 Experimental results and FE model validation

Fig.6 Experimental versus FE load-deflection curves for tested beams.

Fig.7 Layout and FE models of beams strengthened with CNTs-modified CFRP sheet with different lengths.

Fig.8 FE results of beams strengthened with CNTs-modified CFRP sheet with different lengths. (a) Load-deflection curves; (b) cracks initiation; (c) cracks pattern.

Tab.3 FE parametric study results

Fig.9 Layout and FE models of beams strengthened with CNTs-modified CFRP sheet with different width.

Fig.10 FE results of beams strengthened with CNTs-modified CFRP sheet with different width. (a) Load-deflection curves; (b) cracks pattern.

Fig.11 FE models of beams strengthened with U-shape CNTs-modified CFRP sheet.

Fig.12 FE results of beams strengthened with U-shape CNTs-modified CFRP sheet width. (a) Load-deflection curves; (b) cracks pattern.

Fig.13 Effect of concrete strength on strengthening efficiency of CNTs-modified CFRP sheet. (a) Load-deflection curves; (b) normalized flexural capacity.

Fig.14 Cracks pattern of beams cast with varies concrete grades and strengthened with CNTs-modified CFRP sheet.

Fig.15 Effect of steel rebar diameter on strengthening efficiency of CNTs-modified CFRP sheet. (a) Load-deflection curves; (b) normalized flexural capacity.

Fig.16 Cracks pattern of beams reinforced with varies steel bars and strengthened with CNTs-modified CFRP sheet.

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