PSI - Issue 78

Livia Fabbretti et al. / Procedia Structural Integrity 78 (2026) 823–830

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6. Conclusions and future developments In this work a dynamic identification methodology has been proposed and proven effective in accurately identifying the fundamental mechanical parameters of FPS isolators. The genetic algorithm enabled the retrieval of the correct values of the friction coefficient ( μ fast ) and the initial stiffness ( a K ), which most strongly influence the dynamic response of the structure, with practically negligible errors. The estimation of the rate parameter ( rp ), less influential on the global response, showed greater uncertainty, without compromising the overall quality of the prediction. The high reliability in reproducing the simulated waveforms (NRMSE < 1%, R > 0.993 for all signals) confirms the validity of the model even in the presence of realistic noise in the data. Further methodological developments foresee complicating the current model, based on a single equivalent isolator, progressively extending it toward a multi-isolator modeling, which will allow consideration of torsional effects as well. Acknowledgements The first author gratefully acknowledges the Province of Perugia for the logistical and financial support provided during the development of the research, the Eidgenössische Technische Hochschule (ETH) Zürich for the hospitality received during the drafting phase, and the European Union for co-funding the doctoral fellowship through the NextGenerationEU program – National Recovery and Resilience Plan (PNRR) , Mission 4 Component 1, CUP: J63C23000450005. References Berto, L., Favaretto, T., Saetta, A., 2013. Seismic Risk Mitigation Technique for Art Objects: Experimental Evaluation and Numerical Modelling of Double Concave Curved Surface Sliders. Bulletin of Earthquake Engineering, 11, 1817-1840. Celebi, M., 1996. Successful Performance of a Base-Isolated Hospital Building during the 17 January 1994 Northridge Earthquake. The Structural Design of Tall and Special Buildings, 5, 95-109. Cheng, F. Y., Jiang, H., Lou, K., 2008. Smart Structures: Innovative systems for Seismic Response Control, 1 st Edition. CRC Press. Clemente, P., Bongiovanni, G., Buffarini, G., Saitta, F., 2016. Experimental Analysis of Base-Isolated Buildings under Low Magnitude Vibrations. International Journal of Earthquake and Impact Engineering, 1, 199-223. Clemente, P., Martelli, A., 2019. Seismically Isolated Buildings in Italy: State-of-the-Art Review and Applications. Soil Dynamics and Earthquake Engineering, 119, 471-487. Clemente, P., Bongiovanni, G., Buffarini, G., Saitta, F., Castellano, M. G., Scafati, F., 2019. Effectiveness of HDRB Isolation Systems under Low Energy Earthquakes. Soil Dynamics and Earthquake Engineering, 118, 207-220. Dicleli, M., Buddaram, S., 2006. Effect of Isolator and Ground Motion Characteristics on the Performance of Seismic-Isolated Bridges. Earthquake Engineering and Structural Dynamics, 35, 233-250. Erdogan, Y.S., Bakir, P.G., 2013. Evaluation of the Different Genetic Algorithm Parameters and Operators for the Finite Element Model Updating Problem. Computers and Concrete, 11, 541-570. Fabbretti L., Chatzi E., Ubertini F., Breccolotti M., 2025. A Parametric Study on Friction Pendulum Systems for Base-Isolated Buildings: Insights into Performance across Seismic Intensities, 10 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2025). Rhodes Island, Greece. He, R.S., Hwang, S.F., 2006. Damage Detection by an Adaptive Real-Parameter Simulated Annealing Genetic Algorithm. Computers & Structures, 84, 2231-2243. Naeim, F., Kelly, J. M., 1999. Design of Seismic Isolated Structures: From Theory to Practice, 1 st Edition. John Wiley & Sons. Perera, R., Torres, R., 2006. Structural Damage Detection via Modal Data with Genetic Algorithms. Journal of Structural Engineering, 132, 1491– 1501. Rao, M.A., Srinivas, J., Murthy, B.N.S., 2004. Damage Detection in Vibrating Bodies Using Genetic Algorithms. Computers & Structures, 82, 963 968. Saito, T., 2015. Behavior of Response Controlled and Seismically Isolated Buildings During Severe Earthquakes in Japan. Energia, Ambiente e Innovazione, 5, 31-37. Salvatori, A., Di Cicco, A., Clemente P., 2019. Seismic Monitoring of Building with Base Isolation, 7 th Int. Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2019). Crete, Greece. Scafati, F., Ormando, C., Clemente, P., Buffarini, G., Bongiovanni, G., 2024. Effects of Low Energy Earthquakes on a R.C. Building Seismically Isolated by Means of HDRBS and SDS, 18 th World Conference on Earthquake Engineering, Milan, Italy.