PSI - Issue 44

Fabio Mazza et al. / Procedia Structural Integrity 44 (2023) 147–154

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Fabio Mazza et al. / Structural Integrity Procedia 00 (2022) 000–000

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the ground motion excitation, where experimental response are well predicted along both principal directions. Different results can be observed in the second part of the time-history, where the influence of the nonlinear modelling of the CSSBs is more evident as higher values of displacements along the X (Figure 7c) and Y (Figure 7d) directions are predicted by AM 2 (green curve) with respect to AM 1 (red curve) and especially to SM (blue curve). 5. Conclusions Numerical structural and nonstructural blind prediction, using results of a two-phase experimental programme consisting of two scaled fixed-base and base-isolated steel framed hospital buildings subjected to shaking table tests at the University of Kyoto (Japan), is performed. Three contest nonstructural components (i.e. two sand-filled tanks, piping and partition walls) are modelled in a self-developed C++ code. Moreover, a self-built MATLAB code is developed to analyse sliding, rocking and jumping motion of three contest medical equipment (i.e. incubator, dialysis machine and surgical bed). Regarding the fixed-base building, dynamic amplification factors for piping and elevated tanks are in good agreement with experimental results, confirming an adequate overall dynamic matching. Non structural and functional estimated damage states are safe-sided and motion typology is always correctly predicted. Regarding the base-isolated building, numerical predictions of displacement for curved surface sliding bearings are representative of experimental results when axial load and friction coefficient are variable, the latter function of the sliding velocity and axial pressure (AM 1 ). Similar results are obtained for AM 2 , also accounting for the variability of friction coefficient at breakaway and stick-slip phases and temperature increase at the sliding interface. Unsatisfying predictions are obtained when SM is adopted, considering constant values of axial load and friction coefficient. Acknowledgements The present work is financed by Re.L.U.I.S. (Italian network of university laboratories of earthquake engineering), in line to the Convenzione D.P.C.-Re.L.U.I.S. 2022-2024, WP15, Code Contributions for Isolation and Dissipation. Part of the present research is supported by the Tokyo Metropolitan Resilience Project of the National research Institute for Earth Science and Disaster Resilience (NIED). References Davies, R., Retamales, R., Mosqueda, G., Filiatrault, A., 2011. Experimental Seismic Evaluation, Model Parameterization and Effects of Cold Formed Steel-Framed Gypsum Partition Walls on the Seismic Performance of an Essential Facility. Technical Report MCEER-11-0005, MCEER, State University of New York at Buffalo, New York. Design Standard for Steel Structures, 2017. Architectural Institute of Japan (AIJ). Di Sarno, L., Yenidogan, C., Erdik, M., 2013. Field evidence and numerical investigation of the M w =7.1 October 23 Van, Tabanlõ and the M w >5.7 November earthquakes of 2011. Bulletin of Earthquake Engineering 11, 313-346. Filiatrault, A., Sullivan, T., 2014. Performance-based seismic design of nonstructural building components: the next frontier of earthquake engineering. Earthquake Engineering and Engineering Vibration 13(S1), 17-46. MATLAB, 2018. MATrix LABoratory (9.7.0.1190202, R2019b). Natick, Massachusetts. The MathWorks Inc. Mazza, F., 2019. In-plane-out-of-plane non-linear model of masonry infills in the seismic analysis of RC-framed buildings. Earthquake Engineering and Structural Dynamics 48(4), 432-53. Mazza, F., Donnici, A., 2021. In-plane and out-of-plane seismic damage of masonry infills in existing RC structures: the case study of De Gasperi Battaglia school in Norcia. Bulletin of Earthquake Engineering 19(1), 345-76. Mazza, F., Labernarda, R., 2020. Magnetic damped links to reduce internal seismic pounding in base-isolated buildings. Bulletin of Earthquake Engineering 18, 6795-6824. Mazza, F., Labernarda, R., 2022. Effects of near-fault acceleration and non-acceleration pulses on pounding between in-plan irregular fixed-base and base-isolated buildings. Structural Control and Health Monitoring e2992, doi: 10.1002/stc.2992. NIPPON STEEL ENGINEERING CO., LTD. Spherical Sliding Bearing NS.SSB™, 2019. Tokyo. Nipponsteel & Sumikin Engineering Technical Report 2018, Vol. 9. Spherical Sliding Bearing, NS-SSB ® , Low Friction Type. Sato, E., Furukawa, S., Kakehi, A., Nakashima, M., 2011. Full-scale shaking table test for examination of safety and functionality of base-isolated medical facilities. Earthquake Engineering and Structural Dynamics 40, 1435-1453. Blind Prediction Contest 2020 – Integrated Complex Structural/Non-Structural Assessment on Steel Hospital Building. http://www.steel.dpri.kyoto-u.ac.jp/wpsmpl/2020bcp/.