Abstract
This study aims at presenting the analyses of monitoring data that have been used in the context of structural monitoring and Earthquake Early Warning (EEW) for a hospital building in Thessaloniki. Permanent and temporary instrumentation arrays, implemented under the responsibility of Aristotle University of Thessaloniki (SDGEE-AUTH) in close cooperation with German Centre for Geosciences (GFZ) are presented. The ambient noise data recorded at the temporarily installed networks are used for the dynamic characterization of the building based on both vibrational and waveform approaches. Moreover, long-term ambient noise recordings from the permanent array installed within the hospital are used for the investigation of the daily and seasonal wandering of the building resonance frequencies related to environmental effects. The modal identification results are used in a comprehensive framework for the computation of the up-to-date fragility curves representing the actual structural state considering aging effects of the construction materials, possible pre-existing damages and changes in the geometry and mass distribution. The building-specific fragility functions are integrated into two independent EEW systems and rapid damage assessment approaches, namely the PRESTo software and an onsite EEW algorithm on the instruments of the permanent array, to provide the expected level of damage after strong ground shaking at the monitored building. The implemented monitoring networks and the developed operational tools can be used in the context of seismic risk mitigation and preparedness for structural safety assessment under earthquake loading.
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Acknowledgments
The work reported in this paper was carried out in the framework of the REAKT (http://www.reaktproject.eu/) project, funded by the European Commission, FP7-282862. The seismic instruments used for the noise measurements performed in AHEPA have been provided by the Geophysical Instrument Pool Potsdam (GIPP) and the Aristotle University of Thessaloniki (SDGEE-AUTH). The temporary instrumentation array installed on February 2013 was possible thanks to the enthusiastic collaboration of the PhD students and part of the permanent staff from SDGEE-AUTH. The authors are also very grateful to Claus Milkereit and Regina Milkereit for their help in the installation of the permanent SOSEWIN array. The staff of AHEPA hospital is acknowledged for their kind support during the experiment. Finally the authors would like to thank the reviewers for their comments and the guest editors for the special issue.
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Pitilakis, K., Karapetrou, S., Bindi, D. et al. Structural monitoring and earthquake early warning systems for the AHEPA hospital in Thessaloniki. Bull Earthquake Eng 14, 2543–2563 (2016). https://doi.org/10.1007/s10518-016-9916-5
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DOI: https://doi.org/10.1007/s10518-016-9916-5