Procedure for Predicting the Behavior of FRP Confined Concrete Using the FE Method

The plastic behavior of concrete and enhancement of the ductility and compressive strength of reinforced concrete members are indispensable consequences of concrete confinement. Fiber Reinforced Polymers (FRP) are well known as confining materials for circular columns. This study describes how to predict the behavior of concrete con ned with Carbon Fiber Reinforced Polymers (CFRP) using a non-linear analysis. The results of 29 experimental studies are used, where con ning composites have been unidirectional CFRP. The stress-strain behavior of the concrete members from these experiments is estimated as bilinear curves and, by extracting the necessary data, speci c expressions for modeling of the nonlinear behavior of confined concrete are presented. The presented relationships are verified using the results of 16 distinct experiments. The relationships are applicable in the confinement modeling by considering the hoop rupture strain of the CFRP attached to the concrete, and by using the Tsai-Wu failure criterion. As part of the present study, concrete specimens confined with a CFRP composite were modeled with ANSYS software using the presented relationships. The results show the suitability of the model selected, such that the stress-strain curves obtained from the software are properly applicable in the parametric studies conducted on the confined concrete subjected to axial load and exural moment.