Non-linear finite element analysis of reinforced concrete beams repaired by plate bonding

Abstract

This thesis presents a non-linear finite element model for the flexure shear response of RC beams strengthened externally by epoxy bonded steel and glass fiber reinforced plastics (GFRP). The salient features include (i) the introduction of a thin, six-noded element to simulate behavior of the concrete/epoxy glue/plate interface and (ii) a scheme of loading a virgin RC beam to a prescribed displacement to simulate damage, unloading and then reloading the damaged RC beam repaired by an external plate. Results are presented for RC beams repaired by plates of varying thickness and a transmutation of failure mode is noted from classical flexure for the case of external reinforcement in the form of thin plates to a unique concrete cover rip off failure for thicker plates.

Using experimental-numerical approach, and based on data from a specially designed half beam specimen and experimental results from other specimen geometries, combined with their respective nonlinear finite element idealizations, a classical Mohr-Coulomb failure law together with a tension cut-off is suggested for the material characterization of the steel/glue/concrete interface.

Drawing on results of numerical and experimental studies, a rational design approach for plated