Abstract
In the year 2016 Central Italy has been struck by a series of massive earthquakes of significant intensity, highlighting the need to improve the knowledge on the dynamic behavior of masonry structures excited by ground motions in order to develop useful design solutions to mitigate the seismic vulnerability. For this reason, a research program aimed to improve the dynamic performance of masonry structures by using confined masonry technique was started. A shaking table experimental investigation has been carried out on both unreinforced and confined masonry building models at the ENEA laboratory in Casaccia, Rome, in order to compare the dynamic behavior of the two different construction types.
The masonry models modal parameters characterization has been obtained from full-scale Ambient Vibration Tests (AVTs) outside and inside the shaking table through classical contact sensors. It is well known that the dynamic identification of a model fixed on a shaking table is a crucial task, due to the interaction between the complex dynamic actuators system and the model itself producing similar effects to the well known soil–structure interaction problem. For this reason the experimental modal parameters of the two masonry models outside the table have been compared to those obtained when the structural model were bound to the table and subjected to random loads having almost white noise characteristics.
The dynamic investigation was then extended to gather information on the possible influence of the damage patterns observed in the two models on changes in the modal parameters (both natural frequencies and mode shapes). To this purpose, a reference seismic input motion characterized by significant intensity in all the three directions has been used as input and a series of seismic tests have been carried out increasing the amplitudes of the chosen reference acceleration records. At the end of each seismic test, a dynamic characterization test has been carried out applying a white noise random excitation.
The obtained results can be crucial for both calibrating reliable numerical models to be used for static and dynamic non linear analysis and for assessing the ability of the modal parameters to be used as damage detection and localization indexes.
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Acknowledgment
The Authors gratefully acknowledge the financial support of the “Fondazione Cassa di Risparmio di Perugia” that funded this study through the project “Casa Sicura: tecniche antisismiche innovative nella tradizione delle costruzioni” (Project Code 2017.0233.021).
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Pepi, C., Cavalagli, N., Gioffré, M., Gusella, V. (2020). Dynamic Identification and Damage Detection on Masonry Buildings Using Shaking Table Tests. In: Carcaterra, A., Paolone, A., Graziani, G. (eds) Proceedings of XXIV AIMETA Conference 2019. AIMETA 2019. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-41057-5_147
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