Temporal Acoustic Emission Index for Damage Monitoring of RC Structures Subjected to Bidirectional Seismic Loadings Abarkane, Chihab Rescalvo Fernández, Francisco José Donaire Ávila, Jesús Galé-Lamuela, David Benavent Climent, Amadeo Gallego Molina, Antolino Acoustic emission Signal processing Concrete structure Damage Seismic loadings This paper shows the acoustic emission (AE) analysis recorded during the loading process of reinforced concrete (RC) structures subjected to bidirectional seismic loadings. Two waffle plates (bidirectional) supported by isolated square columns were tested on a shaking table with a progressive and increasing ground acceleration until the final collapse. Each specimen was subjected to a different loading history. A relevant delay in the beginning of the significant AE energy is observed as the peak value of the ground acceleration increases. Based on this result, a new AE temporal damage index (TDI), defined as the time difference between the onset of the significant AE activity and the onset of the loading that causes this AE activity, is proposed and validated by comparing it with the plastic strain energy released by the concrete, typically used as a reliable damage level indicator. Good agreement was observed for both specimens and seismic inputs. 2019-10-30T08:19:54Z 2019-10-30T08:19:54Z 2019-08-30 journal article Abarkane, C.; Rescalvo, F.J.; Donaire-Ávila, J.; Galé-Lamuela, D.; Benavent-Climent, A.; Gallego Molina, A. Temporal Acoustic Emission Index for Damage Monitoring of RC Structures Subjected to Bidirectional Seismic Loadings. Materials 2019, 12, 2804. [doi:10.3390/ma12172804] http://hdl.handle.net/10481/57596 doi:10.3390/ma12172804 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI