Characterization of cohesive bond interfaces between FRP and UHPC under mode II loading using finite element methods

The behaviour of bond interfaces in composite structures is critical in the overall performance of the system. The ability to characterize and effectively approximate this behaviour without a considerable experimental sample size can be achieved through the use of finite element method software packages. This investigation will focus on the performance of double lap shear specimens, with Fibre Reinforced Polymer (FRP) plates bonded to Ultra-High Performance Concrete (UHPC) prism with an adhesively bonded aggregate interlock system. A finite element model will be developed to model the global behaviour of the specimens, which will then be validated using experimental test results. After model validation, the development of bond stresses leading up to damage initiation as well as during damage evolution will be evaluated and compared with the trends observed during experimental testing as well as those predicted using numerical methods. The influence on the overall structural behaviour due to areas that have reached maximum bond stress will be examined. The findings from this investigation will provide more clarity into the bond behaviour throughout the entire interface rather than at distinct and discontinuous locations, allowing for improved predictions for pre- and post-damage behaviour at material interfaces.