Mesoscale numerical analysis and test on the effect of debonding defect of rectangular CFSTs on wave propagation with a homogenization method

•A two dimensional (2D) mesoscale homogenization numerical concrete modelling approach with randomly distributed aggregates with different shapes is proposed.•Effect of local mesoscale structure of concrete on stress wave fields is investigated with both mesoscale models and their homogenization models.•The efficiency of the homogenization approach is illustrated.•Mesoscale multi-physics simulation and test results show that the embedded PZT sensor response is dominatly affected by the interface debonding rather than the mesoscale structure of concrere.