▎ 摘　　要

In the past decade, significant studies have been reported on 3D printed meta-structures for various structural, non-structural, and other engineering applications. But hitherto little has been reported on the use of 3D printed meta-structure-inspired sensors for online health monitoring of non-structural cracks in heritage buildings. This study reports the meta-structure 3D printing of polyvinylidene fluoride-6%graphene-3%Mn-doped ZnO composite (by weight proportion) as a smart solution for repair and online health monitoring (of repaired cracks) in heritage structures. Three meta-structures (tri-hexagonal, triangle, and octet) were explored for the proposed composition/proportion, and the mechanical, electrical, sensing and morphological properties were investigated. The results of the study outlined that the tri-hexagonal meta-structure has acceptable mechanical properties (strain hardening coefficient and stiffness in the composite matrix) along with electrical and sensing capabilities for the proposed application . The results obtained are also supported by scanning electron microscopy-energy-dispersive spectroscopy analysis.