Description
The ground-based radar interferometry (T-InSAR) provides such high-precision, contactless measurement capabilities for structural deformations, achieving accuracy levels of 0.001 mm in real-time. Its capacity to measure main vibration frequencies up to 100 Hz and assess deformations across multiple points of a structure simultaneously, with a range resolution of at least 0.75 m, showcases its superiority over conventional contact sensors like accelerometers or optical targets.
Compared to conventional contact sensors, like accelerometers or optical targets, the use of non-contact radar-based techniques overcomes some limitations and drawbacks, especially in the activities on structures in operation where time and space are very restricted. This work focuses on a multidisciplinary monitoring activity carried on Cannavino bridge area located SS 107 Silana-Crotonese. After a preliminary study with the laser scanner and the total station on the of the structure, a short, medium and long-term monitoring protocol was developed. Continuous measurements utilizing static interferometry, displacement transducers, and temperature sensors, capturing data every 15 seconds per station, provided a rich dataset. Additionally, biweekly topographic verifications through the Total Station and dynamic interferometric measurements using the IBIS-FS system during bridge operations at a sampling frequency of 100 Hz ensured consistency in assessing the bridge's resonance frequencies.A special platform was developed that can receive and process data in real time verifying the congestion of the same. This platform was able to send alert messages, when definite thresholds were exceeded, interrupting automatically the traffic. The analysis of results generated detailed displacement time-histories and identified dominant frequencies along the bridge, offering invaluable insights into the structure's behavior.
In summary, this project reaffirms the immense potential and adaptability of terrestrial radar interferometry in rapidly evaluating the structural behavior of infrastructures. The monitoring process has facilitated a comprehensive understanding of the bridge's geometry, relative movements, and critical areas, enabling informed planning for restoration interventions.
