PSI - Issue 78

Michele Morici et al. / Procedia Structural Integrity 78 (2026) 1673–1680

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Figure 10. Deformation time histories recorded by the LVDT sensors installed at Level 0, below the isolation system, in the (a) X direction and (b) Y direction. 5. Conclusions In this work, preliminary results from AVT and OMA performed in the ChIP building are presented, based on data from a permanent monitoring system integrated during construction and validated through a high-resolution experimental campaign. The two monitoring approaches showed excellent consistency in natural frequencies, mode shapes, and damping ratios, confirming the reliability of the permanent installation. Long-term OMA analyses indicated highly stable modal parameters with negligible variability over more than one year. Recordings from a local seismic event further provided critical evidence of the in-service seismic performance of the hybrid base isolated structure. These findings demonstrate the capability of the monitoring strategy to deliver accurate, continuous, and actionable information for real-time structural assessment and lifecycle performance management under both operational and extreme seismic conditions. References Bao, Y., Chen, Z., Wei, S., Xu, Y., Tang, Z., Li, H., 2019. The State of the Art of Data Science and Engineering in Structural Health Monitoring. Engineering 5, 234–242. https://doi.org/10.1016/j.eng.2018.11.027 Dall’Asta, A., Leoni, G., Micozzi, F., Gioiella, L., Ragni, L., 2020. A Resilience and Robustness Oriented Design of Base - Isolated Structures: The New Camerino University Research Center. Front. Built Environ, 6, 50. https://doi.org/10.3389/fbuil.2020.00050. Dall’Asta, A., Leoni, G., Micozzi, F., Gioiella, L., Ceccolini, N., Ragni, L., 2021.The new Camerino university research center: design of the base - isolated buinding and dynamic testing; Athens, Greece, 2021; pp 4005–4014. https://doi.org/10.7712/120121.8763.19032. Dall’Asta, A., Leoni, G., Gioiella, L., Micozzi, F., Ragni, L., Morici, M., Scozzese, F., Zona, A., 2022. Push - and - Release Tests of a Steel Building with Hybrid Base Isolation. Engineering Structures, 272, 114971. https://doi.org/10.1016/j.engstruct.2022.114971. Dall’Asta, A., Leoni, G., Gioiella, L., Micozzi, F., Ragni, L., Morici, M., Scozzese, F., Zona, A., 2023. Preliminary Results from Push - and Release Tests of a Base - Isolated Building in Camerino, Italy. Procedia Structural Integrity, 44, 862–869. https://doi.org/10.1016/j.prostr.2023.01.112. Döhler, M., Mevel, L., 2013. Efficient multi - order uncertainty computation for stochastic subspace identification. Mechanical Systems and Signal Processing, 38(2), 346 - 366. Ierimonti, L., Venanzi, I., Cavalagli, N., Comodini, F., Ubertini, F., 2020. An Innovative Continuous Bayesian Model Updating Method for Base Isolated RC Buildings Using Vibration Monitoring Data. Mechanical Systems and Signal Processing, 139, 106600. https://doi.org/10.1016/j.ymssp.2019.106600. Mellinger, P., Döhler, M., Mevel, L., 2016. Variance estimation of modal parameters from output - only and input/output subspace - based system identification. Journal of Sound and Vibration, 379, 1 - 27. Ragni, L., Micozzi, F., Tubaldi, E., Dall’Asta, A., 2019. Seismic behaviour of a rc frame isolated by hdnr bearings under increasing seismic intensity levels. In Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2019); Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece: Crete, Greece, 2019; pp 3344–3356. https://doi.org/10.7712/120119.7151.19244. Ragni, L., Micozzi, F., Dall’Asta, A., 2025. Long - term viscous effects of in - field tests on HDRBs - based seismic isolation systems. Engineering Structures 339, 120647. https://doi.org/10.1016/j.engstruct.2025.120647 Reynders, E., Pintelon, R., De Roeck, G., 2008. Uncertainty bounds on modal parameters obtained from stochastic subspace identification. Mechanical systems and signal processing, 22(4), 948 - 969. Van Engelen, N., Kelly, G., 2015. Retest of neoprene seismic isolation bearings after 30 years, Struct. Control Health Monit., 22 139–151.