Non - Linear Analysis of Restressed Reinforced Concrete Beams Strengthened wtth Carbon FiberReinforced Polymer Laminates

Abstract

This research was devoted to investigate the behavior and performance of prestressed concrete beams strengthened with externally bonded Carbon Fiber Reinforced Polymer (CFRP) laminates in bending. ANSYS V. 10.0 software was utilized in this work. Material nonlinearity due to cracking and crushing of concrete, nonlinear stress-strain response of concrete, a smeared crack model with tension stiffening of the concrete between cracks and with post-cracking shear transfer were included. Also, the short term prestress losses were considered. The concrete was simulated by 8-node brick elements with three translation degrees of freedom at each node. The reinforcing bars, prestressing strands and Carbon Fiber Reinforced Polymer (CFRP) laminates were idealized as axial members with two nodes and one translation degree of freedom at each node. Several examples of prestressed concrete beams strengthened with CFRP laminates were analyzed and compared with available experimental studies. Good agreements between the results were obtained