Modelling of CFRP strengthening on the behavior of RC slender columns

Abstract

 This paper addresses the strength and deformation capacity of slender columns retrofitted by ex­ternally bonded Carbon Fiber-Reinforced Polymers (CFRP) subjected to seismic loading. The behaviour of RC columns depending on the CFRP confinement (carbon CFRP jacket) and on flexural reinforcement (car­bon plates) was analysed by a nonlinear finite element method based on multilayer shell element and mul­tifiber beams with plasticity and damage models. The numerical results in terms of the load-displacements are very consistent with experimental data. The observed failure modes and crack patterns are satisfactorily reproduced for both columns, without or with the CFRP strength.

Keywords: FEA, concrete columns, retrofitting, CFRP.

Received: October 9th, 2017; revised: October 30th, 2017; accepted: November 2nd, 2017