Abstract
A regulatory framework is required to ensure the correct design of Fibre-Reinforced Polymers (FRPs) increasingly being used as an externally-bonded strengthening system on concrete columns. Several design guidelines on the confinement of FRP concrete have been developed over the past few years worldwide, each proposing a different approach, resulting in different predictions. This study aims to evaluate and compare nine international design guidelines used to predict the compressive strength of confined concrete in FRP-strengthened concrete columns and weigh them against experimental results. The results of this investigation reveal that the predictions from the guidelines on the compressive strengthening of FRP-confined concrete are generally suitable for circular columns, with the ACI-440 and CNR-DT 200 guideline predictions being two of the most accurate. Nevertheless, the guidelines generally tend to overestimate the load-carrying capacity for the compressive strength of FRP-confined concrete in non-circular columns, for which further experimental work using large-scale specimens is required.
Highlights
RESUMEN: Confinamiento de columnas de hormigón con Fibre-Reinforced Polymers (FRPs): revisión de normativas y sus predicciones
This study analyses the most up-to-date international design guidelines for concrete columns fully-wrapped with FRP under concentric axial loads
This paper provides an analytical review of the design guidelines for FRP-confined concrete columns
Summary
RESUMEN: Confinamiento de columnas de hormigón con FRP: revisión de normativas y sus predicciones. Esta investigación pretende contrastar con resultados experimentales las predicciones que nueve normativas internacionales hacen sobre la resistencia a compresión de una columna de hormigón confinada con FRP. This study analyses the most up-to-date international design guidelines for concrete columns fully-wrapped with FRP under concentric axial loads. The goals of this research are to: (i) provide an indepth description of the guidelines, (ii) compare the predictions of the design guidelines against each other and against the experimental test results from previous research and (iii) identify and highlight the strengths and weaknesses of the design guidelines. Richart et al carried out an extensive study about lateral active confinement on concrete cylinders under simple compression [13]. They determined that both compressive strength and strain increments are directly related to the lateral confinement pressure applied (Equations [1] and [2], respectively)
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