Eccentricity-based design-oriented model of FRP-confined concrete rectangular columns

What is it about?

It is generally agreed that the stress–strain relationship of the plain concrete under the effect of concentric loading represents the behavior of concrete under eccentric loading. Also, Saatcioglu et al.(1995) concluded that a concrete model based on test results of concentrically loaded columns can be applied in the analysis of RC columns under the effect of eccentric loadings, provided that the model of the confined concrete incorporates relevant parameters of confinement. Here, a question is raised: ‘‘is it likely to use the stress– strain relationship developed for the concentrically loaded FRP-confined concrete to construct the P–M diagram for FRP-RC elements?’’ This study presents the findings of experimental results and analytical evaluation answering the raised question.

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Why is it important?

A robust and accurate analytical evaluation for the behavior and strength of exiting structures externally confined with FRP is critical for design engineers to accurately define design details of strengthened/retrofitted structures using FRP composites.

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