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THE BENEFICIAL AND DETRIMENTAL EFFECTS OF ROCKING SHALLOW FOUNDATIONS ON SUPER STRUCTURE DURING SEISMIC LOADING
Session: Earthquakes and Geohazards II / Séismes et géoaléas II
Partheeban Selvarajah, Student (United States)
Sivapalan Gajan, Associate Professor (United States)
Generally, modern seismic design codes prohibit relative movement between the foundation and the soil beneath, which demands the structural elements of the superstructure to dissipate seismic energy. The primary benefit of appropriately reducing the size of the footing in shallow foundation is the partial isolation of the structure from the soil beneath (uplift and rocking). The rocking behavior caused by the seismic loading can occur around the footing base, subsequently dissipating the seismic energy and reducing the ductility demands transmitted to the superstructure. In this study, several centrifuge and shake table experiments on rocking shallow foundations have been analyzed to investigate the following beneficial and detrimental effects in an attempt to come up with a balanced design methodology: reliability and predictability of the moment capacity of the soil-foundation system, rocking induced energy dissipation and the resulting permanent settlement of the foundation, and the reduced ductility demands (maximum and permanent tilt of the structure) transmitted to the super structure.
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