Evaluation of Existing Axial Compressive Strength Models of FRP-Confined Circular Concrete Columns

Abstract

In this paper, the precision of some existing models for axial compressive strength of circular concrete columns confined by fiber reinforced polymer (FRP) composites is investigated. To achieve this goal, a database of experimentally tested FRP-confined circular cross-section concrete columns is gathered. The database includes columns with various diameters, heights and concrete compressive strength, as well as different FRP wraps with various thickness and tensile strengths. Considering these geometrical and mechanical properties as inputs, the precision of existing compressive strength models is evaluated by calculating common errors and performance criteria such as correlation coefficient (R), and mean absolute percentage error (MAPE). The results show that among the existing axial compressive strength of FRP-confined circular concrete columns models, the Bisby model outperforms others with R and MAPE values of 0.8325 and 26.50%, respectively.