TY - CONF A1 - Liao, Chun-Man A1 - Fontoura Barroso, Daniel T1 - Investigation of temperature effects on ultrasonic velocity in a prestressed concrete bridge model T2 - European Workshop on Structural Health Monitoring N2 - Ultrasonic measurements have recently been applied in the context of structural health monitoring in civil engineering. The ultrasonic method is very sensitive to environmental conditions and material property changes, which might be caused by prestress losses and loading effects on the bridge. However, it remains a challenge to identify the damage mechanisms causing structural property changes from the above mentioned factors influencing ultrasonics. The focus of this contribution is to investigate the correlation between ultrasonic velocities and temperature by the coda wave interferometry (CWI) analysis. Long-term monitoring of a prestressed concrete bridge model under field conditions was carried out to observe the effect of temperature. The homogeneous change in concrete caused by temperature was revealed by applying the CWI method. The threshold value of the best correlation coefficients for the linear regression of temperature and ultrasonic velocity changes was also studied. Experimental assessment will provide a ratio for temperature correction to evaluate the pre-stressing force decrease and its consequences on crack opening or extension. T2 - Tagung EWSHM2022 CY - Palermo, Italy DA - 04.07.2022 KW - Ultrasonic Velocity KW - Coda Wave Interferometry KW - Temperature Correction KW - Prestressing Force KW - Bridge Monitoring PY - 2022 SN - 978-3-031-07257-4 SN - 978-3-031-07258-1 DO - https://doi.org/10.1007/978-3-031-07258-1_82 VL - 2 SP - 813 EP - 823 PB - Springer Nature AN - OPUS4-55289 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -