Performance Of Vertically/Obliquely Reinforced 1-3 Piezoelectric Composites For Active Control Of Smart Laminated Composite Structures. : Although vertically/obliquely reinforced 1-3 piezoelectric composites are commercially available and characterized by the improved mechanical performance, the electromechanical coupling characteristics and the acoustic impedance matching over the existing monolithic piezoelectric materials, the researches on the use of these piezoelectric composites as the distributed actuators of smart structures have not yet been reported. Intent of this Thesis is concerned with the investigation of the performance of these vertically/obliquely reinforced piezoelectric composites as the candidate materials for distributed actuators of laminated smart composite structures. Two- and three- dimensional micromechanics models are derived to predict the effective elastic and piezoelectric properties of these composites which are subsequently utilized for two- and three- dimensional analyzes of smart laminated composite structures. The task of investigating the performance of the active constrained layer damping (ACLD) treatment in which the constraining layer is made of these vertically/obliquely reinforced 1- 3 piezoelectric composites has been accomplished to demonstrate the use of these composites as the materials for distributed actuators. Using such ACLD treatment, ACLD of laminated composite beams, plates, shells and shallow shells (panels) are analyzed. Finite Element (FE) models are derived to describe the open loop and closed loop dynamics of laminated composite beams, plates, shells and shallow shells integrated with the patches of such ACLD treatment. Unlike the existing FE models for ACLD of smart structures, both inplane and transverse actuations by the 1-3 piezoelectric constraining layer of the ACLD treatment have been utilized for deriving the present FE models.