Soil-foundation-structure interaction with mobilization of bearing capacity: experimental study on sand

V. Drosos, T. Georgarakos, M. Loli, I. Anastasopoulos, O. Zarzouras, G. Gazetas

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    57 Citations (Scopus)

    Abstract

    Recent studies have highlighted the beneficial role of foundation uplifting and the potential effectiveness of guiding the plastic hinge into the foundation soil by allowing full mobilization of bearing capacity during strong seismic shaking. With the inertia loading transmitted onto the superstructure being limited by the capacity of the foundation, this concept may provide an alternative method of in-ground seismic isolation: the so-called rocking isolation. Attempting to unravel the effectiveness of this alternative design method, this paper experimentally investigates the nonlinear response of a surface foundation on sand and its effect on the seismic performance of an idealized slender single-degree-of-freedom structure. Using a bridge pier as an illustrative prototype, three foundation design alternatives are considered, representing three levels of design conservatism. Their performance is investigated through static (monotonic and slow-cyclic pushover) loading, and reduced-scale shaking table testing. Rocking isolation may provide a valid alternative for the seismic protection of structures, providing encouraging evidence in favor of the innovative idea of moving foundation design toward a less conservative, even unconventional, treatment.

    Original languageEnglish
    Pages (from-to)1369-1386
    Number of pages18
    JournalJournal of Geotechnical and Geoenvironmental Engineering
    Volume138
    Issue number11
    DOIs
    Publication statusPublished - Nov 2012

    Keywords

    • SETTLEMENTS
    • UPLIFT
    • Shaking table testing
    • ROCKING
    • BEHAVIOR
    • PERFORMANCE
    • Slow-cyclic pushover
    • Seismic response
    • Shallow foundation
    • MACRO-ELEMENT
    • MODEL
    • SHAKING
    • Bridge pier
    • SHALLOW FOUNDATIONS
    • FOOTINGS
    • Nonlinear behavior
    • Experiment

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