Modified design procedures for bridge pile foundations subjected to liquefaction-induced lateral spreading. Issue 2 (6th April 2017)

• Record Type: Journal Article
• Authors: Khosravifar, Arash; Nasr, Jonathan
• Is Part Of: DFI journal. Volume 11:Issue 2/3(2018)
• Page Start: 114
• Page End: 127
• Publication Date: 2017-04-06
• Subjects: Pile -- Liquefaction -- Lateral spreading; Piling (Civil engineering) -- Periodicals; Foundations -- Periodicals; Foundations; Periodicals; 624.15
• DOI: 10.1080/19375247.2018.1436382
• Languages: English
• ISSNs: 1937-5247

Abstract

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.