An important application of FRP composites is as a confining material for concrete, in both the seismic
retrofit of existing reinforced concrete columns and in the construction of concrete-filled FRP tubes as
earthquake-resistant columns in new construction. Reliable design of these structural members necessitates
clear understanding and accurate modeling of the stress–strain behavior of FRP-confined concrete.
To that end, a great number of studies have been conducted in the past two decades, which has led to the
development of a large number of models to predict the stress–strain behavior of FRP-confined concrete
under axial compression. This paper presents a comprehensive review of 88 models developed to predict
the axial stress–strain behavior of FRP-confined concrete in circular sections. Each of the reviewed models
and their theoretical bases are summarized and the models are classified into two broad categories,
namely design-oriented and analysis-oriented models. This review summarizes the current published literature
until the end of 2011, and presents a unified framework for future reference. To provide a comprehensive
assessment of the performances of the reviewed models, a large and reliable test database
containing the test results of 730 FRP-confined concrete cylinders tested under monotonic axial compression
is first established. The performance of each existing stress–strain model is then assessed using this
database, and the results of this assessment are presented through selected statistical indicators. In the
final part of the paper, a critical discussion is presented on the important factors that influenced the overall
performances of the models. A close examination of results of the model assessment has led to a number
of important conclusions on the strengths and weaknesses of the existing stress–strain models, which
are clearly summarized. Based on these observations, a number of recommendations regarding future
research directions are also outlined.
An important application of FRP composites is as a confining material for concrete, in both the seismicretrofit of existing reinforced concrete columns and in the construction of concrete-filled FRP tubes asearthquake-resistant columns in new construction. Reliable design of these structural members necessitatesclear understanding and accurate modeling of the stress–strain behavior of FRP-confined concrete.To that end, a great number of studies have been conducted in the past two decades, which has led to thedevelopment of a large number of models to predict the stress–strain behavior of FRP-confined concreteunder axial compression. This paper presents a comprehensive review of 88 models developed to predictthe axial stress–strain behavior of FRP-confined concrete in circular sections. Each of the reviewed modelsand their theoretical bases are summarized and the models are classified into two broad categories,namely design-oriented and analysis-oriented models. This review summarizes the current published literatureuntil the end of 2011, and presents a unified framework for future reference. To provide a comprehensiveassessment of the performances of the reviewed models, a large and reliable test databasecontaining the test results of 730 FRP-confined concrete cylinders tested under monotonic axial compressionis first established. The performance of each existing stress–strain model is then assessed using thisdatabase, and the results of this assessment are presented through selected statistical indicators. In thefinal part of the paper, a critical discussion is presented on the important factors that influenced the overallperformances of the models. A close examination of results of the model assessment has led to a numberof important conclusions on the strengths and weaknesses of the existing stress–strain models, whichare clearly summarized. Based on these observations, a number of recommendations regarding futureresearch directions are also outlined.
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