Modelling of cfrp strengthened concrete beam to quantify the effects of bond parameters in flexure

Abstract

Application of Carbon Fiber Reinforced Polymer (CFRP) materials is an emerging technique for retrofitting concrete structures. Performance of composites mainly depends on the adhesive component which uses to create the bond between CFRP and concrete. A variety of commercial products of epoxies and CFRP materials are available in the market. Therefore a range of mechanical properties of such products is accessible. The bond performance may vary with the type of selected materials. Identification of flexural performance of CFRP strengthened concrete beams with variable material properties of CFRP and Epoxy is the main connotation. In general, application of CFRP materials to enhance flexural capacity extends throughout the span of the beam. Since CFRP materials are relatively expensive, it is important to quantify the performance difference with usage of material. A numerical model was developed to predict the performance of CFRP strengthened concrete beams and also to quantify the effects of different control parameters and mechanical properties on flexural performance of the composite. The model results are in good agreement with the experimental results. Parametric studies were also carried out to verify the performance with varying bond properties and mechanical properties of CFRP. The results indicate that the normal modulus of CFRP is appropriate for strengthening concrete elements. Increased flexural performance cannot be expected by increasing material usage. Use of number of layers doesn’t provide an economical solution in strengthening of beams. The paper provides recommendations for strengthening concrete elements in economical way.