Abstract
The impact of adopting different dynamic soil–structure interaction (SSI) models on the assessment of seismic fragility functions for buildings with pile foundations is studied herein. Given the importance on seismic response of the coupling of structure, foundation and soil, and the challenges posed on modelling dynamic SSI, especially when soil nonlinearity plays a significant role, the linear substructure approach is initially adopted by implementing two different models, followed by the use of a nonlinear pile-head macro-element. The first model is one-dimensional and includes, between the foundation node and the ground, only a translational elastic spring and a dashpot, whose stiffness and viscous damping are retrieved from the real and imaginary parts of the dynamic impedance at the first natural frequency of the structure. The second and more refined model is a Lumped-Parameter Model accounting for frequency dependence of the coupled horizontal and rotational impedances in a two-dimensional response. A nonlinear pile-head macro-element model is introduced afterwards to explore the sensitivity of fragility functions to the linearity assumption. This approach models the soil nonlinear behaviour at near-field, as well as the far-field dynamic impedance and energy dissipation through radiation damping, by condensing the entire soil-foundation system into a single nonlinear element at the base of the superstructure. In all models, the superstructure is represented in a simplified way as a nonlinear single-degree-of-freedom system. The comparison between the adopted approaches is evaluated in terms of their effects on the characterisation of fragility functions for unreinforced masonry buildings with pile foundations.
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Acknowledgements
The authors are particularly grateful to Pauline Kruiver, who kindly provided access to the soil mechanical characterisation data and site response analysis results for the Groningen region. The constructive feedback of two anonymous reviewers, which led to the improvement of the original version of the manuscript, is also gratefully acknowledged.
Funding
This work was undertaken within the framework of the research programme for hazard and risk of induced seismicity in Groningen sponsored by the Nederlandse Aardolie Maatschappij BV (NAM).
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Cavalieri, F., Correia, A.A., Crowley, H. et al. Seismic fragility analysis of URM buildings founded on piles: influence of dynamic soil–structure interaction models. Bull Earthquake Eng 18, 4127–4156 (2020). https://doi.org/10.1007/s10518-020-00853-9
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DOI: https://doi.org/10.1007/s10518-020-00853-9