7 Anomaly Detection Through Long-Term SHM: Some Interesting Cases on Bridges 65 Table 7.1 Comparison between experimental data and those provided by the FE model Baseline frequencies [Hz] Summer frequencies [Hz] Winter frequencies [Hz] Mode Type Sensors FEM [%] Sensors FEM [%] Sensors FEM [%] a Lateral 1.83 1.79 −2.2 2.80 2.55 −8.9 1.80 1.85 +2.8 b Flexural 4.40 4.26 −3.2 4.77 4.98 +4.4 4.60 5.03 +9.3 c Flexural 8.60 8.77 +2.0 9.40 8.74 −7.0 8.45 8.74 +3.4 References 1. Farrar, C.R., Worden, K.: Structural Health Monitoring: A Machine Learning Perspective. Wiley (2012)., ISBN: 978-1-119-99433-6 2. Cury, A., Ribeiro, D., Ubertini, F., Todd, M.: Structural Health Monitoring Based on Data Science Techniques. Springer (2022)., ISBN 978-3030-81715-2 3. Lynch, J.P., Sohn, H., Wang, M.L.: Sensor Technologies for Civil Infrastructures, Volume 2: Applications in Structural Health Monitoring. Woodhead Publishing Series in Civil and Structural Engineering (2014)., ISBN 9781782422426 4. Cigada, A., Lucà, F., Malavisi, M., Mancini, G.: Structural health monitoring of a damaged operating bridge: a supervised learning case study. In: Dynamics of Civil Structures, Volume 2, Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics. Springer (2020)., ISBN: 978-3-030-47633-5 5. Cawley, P.: Structural health monitoring: closing the gap between research and industrial deployment. Struct. Health Monit. 17(5), 1225–1244 (2018). https://doi.org/10.1177/1475921717750047 6. Kavitha, S., Daniel, R.J., Sumangala, K.: High performance MEMS accelerometers for concrete SHM applications and comparison with COTS accelerometers. Mech. Syst. Signal Process. 66–67, 410–424 (2016) 7. Ribeiro, R.R., de Melo Lameiras, R.: Evaluation of low-cost MEMS accelerometers for SHM: frequency and damping identification of civil structures. In: CILAMCE 2018: Ibero-Latin American Congress on Computational Methods in Engineering 8. Concepcion, R.S., Cruz, F.R.G., Uy, F.A.A., Baltazar, J.M.E., Carpio, J.N., Tolentino, K.G.: Triaxial MEMS digital accelerometer and temperature sensor calibration techniques for structural health monitoring of reinforced concrete bridge laboratory test platform. In: 2017 IEEE 9th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM), pp. 1–6 (2017). https://doi.org/10.1109/HNICEM.2017.8269422 9. ISO 20816-1:2016 Mechanical vibration — Measurement and evaluation of machine vibration — Part 1: General guidelines
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