The article deals with numerical modeling of piezoelectric smart aggregates based on finite element method. Finite element modeling of piezoelectric patch is based on constitutive equations for coupled electro-mechanical behavior, while for surrounding concrete linear elastic material model is assumed. Different intensities of electric voltage were analyzed and displacements at control points were measured. Obtained results indicate that there is a complete linear relationship between the deformation and the electrical voltage at the control points, and nonlinear development of deformation by cross-sectional thickness of piezoelectric smart aggregate.