Inclusion of axial load on bending response of pile in liquefiable soils

D. Lombardi, S.R. Dash, S. Bhattacharya

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Collapse or severe damage of structures supported on pile foundations have been observed after many severe earthquakes, especially where the soil conditions consisted of soft deposits characterised by poor mechanical properties (i.e. low values of strength and shear modulus or soil susceptible to liquefaction). The formation of the plastic hinges in the piles at various locations suggest that the bending moments and/or shear forces experienced by them would have exceeded the bending and/or shear capacity of the section. However, many case histories have shown collapses albeit a high margin of safety being effectively applied during design with regard to the classical mechanism of failures, such as the bending and the shear mechanisms. This may suggest that the actual mechanism of failure has not been properly considered. Recently, the buckling instability of piles in liquefiable soils are recognised as a possible failure mechanism. Although the current codes of practice do not explicitly mention this particular issue, the presence of large axial loads may have important consequences, particularly where piles are founded in liquefiable or very soft soils. In such conditions, the axial and lateral loads (from inertia or spreading soil) may also lead to a reduction of the buckling capacity due to the second order non-linear effects, and the piles may fail due to buckling instability. In this paper the role played by the axial loads and its influence on the bending behaviour of piles are investigated
    Original languageEnglish
    Title of host publicationProc. 8th International Conference on Urban Earthquake Engineering
    Place of PublicationTokyo, Japan
    PublisherTokyo Institute of Technology
    Pages1-5
    Number of pages5
    Publication statusPublished - 7 Mar 2011
    Event8th International Conference on Urban Earthquake Engineering - Tokyo Institute of Technology, Tokyo, Japan
    Duration: 7 Mar 20118 Mar 2011

    Conference

    Conference8th International Conference on Urban Earthquake Engineering
    CityTokyo Institute of Technology, Tokyo, Japan
    Period7/03/118/03/11

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