CFRP Strengthening of RC tensile members with stiff and soft adhesives

摘要

Single lap shear tests with externally bonded carbon fibre reinforced polymers (CFRP) laminates are carried out to examine the effect of differing adhesives on the load-slip behaviour. Displacement of the surface are measured with digital image correlation (DIC) to establish the cohesive material response for the interface. Due to the changed material properties (softer adhesive) larger effective bond lengths (from the textile to concrete) are examined. The determined cohesive laws are implemented in a numerical simulation of externally strengthened reinforced concrete (RC) tensile members to show the potential usability of softer adhesives for the strengthening technique. A change in the overall behaviour of strengthened systems and a more compatible system (plain strain distribution) could be in sight.