Abstract
In this paper we propose reduction factors accounting for the decrease of stiffness of monumental masonry foundations due to aging, weathering, or other deteriorating effects. The proposed reduced stiffness values can be readily used in finite element structural analysis software in the framework of performance-based assessment, representing linear elastic springs at the foundation level. These springs account for foundation-soil system flexibility and soil-foundation interaction (SFI) at low-frequency vibrations. Accordingly, we propose a procedure to reduce monumental masonry foundation-wall stiffness from the rigid-footing assumption, with respect to the relative stiffness between the foundation and the soil. The proposed procedure is applied to the historical structure Arsenal De Milly in the Medieval City of Rhodes, where period elongation and ductility increase are highlighted, because of SFI and foundation flexibility.
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Acknowledgments
This work has been funded by the PERPETUATE (Performance-based approach to earthquake protection of cultural heritage in European and Mediterranean countries) project of the EC-Research Framework Programme FP7. The authors are grateful to the “Foundation for the Financial Administration and Realization of Archaeological Projects” of Ministry of Cultures of Greece, and more specifically to Dr. Georgios Ntellas and Emmanuil Kallioudakis for supporting and providing all data for the monuments of the Medieval City of Rhodes in Greece. We thank Grigoris Tsinidis of Aristotle University Thessaloniki, for helping us in the numerical modeling of soil-foundation interaction, and Kyriaki Gkoktsi for her help in the numerical modeling of Arsenal De Milly.
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Pitilakis, D., Karatzetzou, A. Dynamic stiffness of monumental flexible masonry foundations. Bull Earthquake Eng 13, 67–82 (2015). https://doi.org/10.1007/s10518-014-9611-3
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DOI: https://doi.org/10.1007/s10518-014-9611-3