Polymers 2014, 6(4), 1187-1206; doi:10.3390/polym6041187
Article

Simplified Modeling of Rectangular Concrete Cross-Sections Confined by External FRP Wrapping

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Received: 2 December 2013; in revised form: 10 February 2014 / Accepted: 8 April 2014 / Published: 17 April 2014
(This article belongs to the Special Issue Selected Papers from "SMAR 2013")
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Abstract: The goal of this research project is to model the effect of confinement by means of fiber reinforced polymer (FRP) externally bonded wrapping, hence to provide a simplified closed form solution to determine directly the ultimate confined concrete strength. Common cross-section shapes for reinforced concrete (RC) columns are considered herein, namely square and rectangular. The simplified model is derived from a more refined iterative confinement model proposed by the same authors to evaluate the entire stress-strain relationship of confined concrete. Based on a detailed analysis of the stress state through Mohr’s circle, a simplified closed form solution is proposed to account for the non-uniformly confined concrete performance exhibited in non-axisymmetric sections. The non-uniform confining stress field exhibited in such cross-sections is explicitly considered by means of the mean value integral of the pointwise variable stress state over the cross-section. The key aspect of the proposed methodology is the evaluation of the effective equivalent pressure to be inserted in any triaxial confinement model, to account for the peculiarities of square and rectangular cross-sections. Experimental data, available in the literature and representative of a wide stock of applications, were compared to the results of the theoretical simplified model to validate the proposed approach, and satisfactory results were found.
Keywords: simplified modeling; closed form solution; confined concrete strength; FRP confinement; columns; non-circular cross-sections; externally bonded reinforcement
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MDPI and ACS Style

Lignola, G.P.; Prota, A.; Manfredi, G. Simplified Modeling of Rectangular Concrete Cross-Sections Confined by External FRP Wrapping. Polymers 2014, 6, 1187-1206.

AMA Style

Lignola GP, Prota A, Manfredi G. Simplified Modeling of Rectangular Concrete Cross-Sections Confined by External FRP Wrapping. Polymers. 2014; 6(4):1187-1206.

Chicago/Turabian Style

Lignola, Gian P.; Prota, Andrea; Manfredi, Gaetano. 2014. "Simplified Modeling of Rectangular Concrete Cross-Sections Confined by External FRP Wrapping." Polymers 6, no. 4: 1187-1206.


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