DFI Journal - The Journal of the Deep Foundations Institute

Volume 11, Issue 2, January 2017
DOI: 10.1080/19375247.2018.1436382

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Modified Design Procedures for Bridge Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading

Khosravifar, A. & Nasr, J.

Abstract


Effective-stress nonlinear dynamic analyses (NDA) were performed for piles in the liquefiable sloped ground to assess how inertia and liquefaction-induced lateral spreading combine in long- and short-duration motions. A parametric study was performed using input motions from subduction and crustal earthquakes covering a wide range of durations and amplitudes. The NDA results showed that the pile demands increased due to (a) longer duration shakings, and (b) liquefaction-induced lateral spreading compared to nonliquefied conditions. The NDA results were used to evaluate the accuracy of the equivalent static analysis (ESA) recommended by Caltrans/ODOT for estimating pile demands. Finally, the NDA results were used to develop new ESA methods to combine inertial and lateral spreading loads for estimating elastic and inelastic pile demands.

Keywords:
pile, liquefaction, lateral spreading