PSI - Issue 44

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 44 (2023) 147–154

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy Keywords: shaking table tests; fixed-base structure; base-isolated structure; nonstructural components; medical equipment. Abstract New hospitals are frequently designed u ing base-isol tion sy tems to improve their structural response in futur seismic events, contrary to the obser ed rather po r seismic performance of veral fixed-base hospita s. Despite this vidence, a fair question arises about the c nvenience, or not, of using the e modern seismic protection technol gies as opposed to oth r convention l structural design soluti ns, on the grounds of a holistic pproach b sed on structural and nonstructural damage expected as w ll s continuity of service to the community in the f rmath f an e rthquake. The current study aims to a integrated numerical ssessment in a hospital setting, ith particula attention to ev luati g and classif ing functionality of nonstructural components and critical m dical equipment. Two scaled four-storey (fixed-base) and three-storey (base-isolated) hospit l fr med buildings were built and subjected to shaking table t sts at the University f Kyoto (Japan). A two-phase xperimental campaign with numerical structura and nonstru tural blind prediction t ok place, considering two earthquakes caled t diff rent inte sity levels. T t is end, a self-built C++ ode is developed to accou t for lumped plasticity modelli g of steel fra e members an variability of the friction coefficient of curved surfac sliding bearings. Mor over, three co test n nstructural compone ts are modelled in the fixed base structure: i.e. elastic single d gree of freedom systems representing two tanks filled with sand (top floor); elastic beam elements for piping (third floor); five-elem nt macr -model for the in-plane-out-of-plane nonli ear res onse of partition walls (fir floor). Finally, a self-built MATLAB code is employed in order to nalyse sliding, rocking and jumping m tion f thr e contest medical equip nt (i.e. incubator at third floor; ialysis machine t second floor; surgical bed at first floor), on the basis of acceleration time histories of selected structural nodes of the fixed-base structure. © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acces article under CC BY-NC-ND lic nse ( https://creativec mmo s.org/licenses/by-nc-nd/4.0 ) P er-review under responsibility o th scientific committee of the XIX ANIDIS Co ference, Seismic Engi ering in Italy Keywords: shaking table tests; fixed-base structure; base-isolated structure; nonstructural components; medical equipment. XIX ANIDIS Conference, Seismic Engineering in Italy Seismic vulnerability of fixed-base and base-isolated hospitals: blind comparison between shaking table and numerical tests Fabio Mazza a *, Angelo Donnici a , Rodolfo Labernarda a a Dipartimento di Ingegneria Civile, Università della Calabria, Ponte P. Bucci, 87036 Rende (CS), Italy Abstract New hospitals are frequently designed using base-isolation systems to improve their structural response in future seismic events, contrary to the observed rather poor seismic performance of several fixed-base hospitals. Despite this evidence, a fair question arises about the convenience, or not, of using these modern seismic protection technologies as opposed to other conventional structural design solutions, on the grounds of a holistic approach based on structural and nonstructural damage expected as well as continuity of service to the community in the aftermath of an earthquake. The current study aims to an integrated numerical assessment in a hospital setting, with particular attention to evaluating and classifying functionality of nonstructural components and critical medical equipment. Two scaled four-storey (fixed-base) and three-storey (base-isolated) hospital framed buildings were built and subjected to shaking table tests at the University of Kyoto (Japan). A two-phase experimental campaign with numerical structural and nonstructural blind prediction took place, considering two earthquakes scaled at different intensity levels. To this end, a self-built C++ code is developed to account for lumped plasticity modelling of steel frame members and variability of the friction coefficient of curved surface sliding bearings. Moreover, three contest nonstructural components are modelled in the fixed base structure: i.e. elastic single degree of freedom systems representing two tanks filled with sand (top floor); elastic beam elements for piping (third floor); five-element macro-model for the in-plane-out-of-plane nonlinear response of partition walls (first floor). Finally, a self-built MATLAB code is employed in order to analyse sliding, rocking and jumping motion of three contest medical equipment (i.e. incubator at third floor; dialysis machine at second floor; surgical bed at first floor), on the basis of acceleration time histories of selected structural nodes of the fixed-base structure. XIX ANIDIS Conference, Seismic Engineering in Italy Seismic vulnerability of fixed-base and base-isolated hospitals: blind comparison between shaking table and numerical tests Fabio Mazza a *, Angelo Donnici a , Rodolfo Labernarda a a Dipartimento di Ingegneria Civile, Università della Calabria, Ponte P. Bucci, 87036 Rende (CS), Italy

* Corresponding author. Tel.: +39-0984-496908; fax: +39-0984-494045. E-mail address: fabio.mazza@unical.it * Corresponding author. Tel.: +39-0984-496908; fax: +39-0984-494045. E-mail address: fabio.mazza@unical.it

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XIX ANIDIS Conference, Seismic Engineering in Italy. 10.1016/j.prostr.2023.01.020