Acoustic emission (AE) monitoring has the unique ability to record crack propagation inside the material and indicate the condition of the structure. Although AE has been widely used for concrete and steel bridges , its use for masonry structures is currently very limited. Application of AE to masonry arch bridges has been investigated through a series of laboratory and field studies and has been found to provide useful information on the condition of masonry structures, their response to traffic loading and the efficacy of strengthening works.
Tomor, A. (2016). Acoustic emission monitoring of masonry arch bridges