Development of A Design Guideline for Bridge Pile Foundation Subjected to Liquefaction-Induced Lateral Spreading-Paper

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The study examines how bridge piles in liquefiable sloped ground respond to earthquake-induced lateral spreading and inertial loading. The researchers conducted effective-stress nonlinear dynamic analyses using motions from subduction and crustal earthquakes with a broad range of durations. Results showed that pile demands were greater when liquefaction-induced lateral spreading occurred than under nonliquefied conditions. The analyses were also used to assess the accuracy of the equivalent static analysis methods recommended by Caltrans and ODOT. Based on the findings, the authors developed new equivalent static approaches for combining inertial and lateral-spreading loads to estimate both elastic and inelastic pile demands.

Keywords

bridge piles

liquefiable sloped ground

earthquake loading

lateral spreading

inertial loading

effective-stress nonlinear dynamic analysis

subduction earthquakes

crustal earthquakes

equivalent static analysis

pile demand