Numerical analysis of the behavior of concrete columns confined with CFRP using the constitutive model concrete damaged plasticity

Abstract

The use of carbon fiber reinforced polymers (CFRP) in the reinforcement of concrete structures was consolidated in civil construction due to its excellent mechanical properties and low specific weight. In this context, this article aims to present numerical simulations in finite elements of columns reinforced externally to the CFRP, submitted to centralized compression. The simulations were developed considering the physical non-linearity of the concrete through the constitutive model Concrete Damaged Plasticity (CDP), based on plasticity and damage to the material. The numerical models were calibrated with data from experimental tests and indicated good compatibility of forces and axial displacements. The distribution of the compression stresses indicated that for the case of centered force the circular columns present uniform confinement, while in the prismatic columns the confinement is concentrated close to the rounded corners. The reinforcement efficiency in the resistance gain for different column cross sections was proven.