Abstract
This paper focuses on the assessment of the critical acceleration of soil-foundation systems and examines the influences of various relevant parameters. Using a formula recently proposed for the evaluation of the bearing capacity of shallow strip foundations in seismic conditions, the critical acceleration of the soil-foundation system has been evaluated imposing the equilibrium condition between the limit load of the soil-foundation system and load transmitted from the foundation onto the ground surface. The proposed solution led to an iterative equation that permits the numerical evaluation of the critical acceleration.
An extensive parametric analysis allowed to examine the effects of many relevant parameters, such as the angle of shear strength of the foundation soil, the value of the surcharge acting aside the footing, the static vertical load transmitted by the foundation, the direction of the resultant of the inertial forces acting in the soil and in the superstructure.
The results obtained are provided in design charts for given sets of the relevant parameters and allow a quick evaluation of the critical acceleration of the soil-foundation system.
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Acknowledgements
This work is part of the research activities carried out by the University of Messina Research Unit in the framework of the work package WP16 - Contributi normativi - Geotecnica (Task 16·3: Interazione terreno-fondazionestruttura, Sub-task 16·3·2: Capacità dissipativa dell’interfaccia terreno-fondazione) of a Research Project funded by the ReLuis (Network of Seismic Engineering University Laboratories) consortium (Accordo Quadro DPC/ReLUIS 2019–2021).
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Casablanca, O., Biondi, G., Cascone, E. (2022). Critical Acceleration of Shallow Strip Foundations. In: Wang, L., Zhang, JM., Wang, R. (eds) Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022). PBD-IV 2022. Geotechnical, Geological and Earthquake Engineering, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-031-11898-2_42
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DOI: https://doi.org/10.1007/978-3-031-11898-2_42
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