Proceedings of the 42nd Annual Conference on Deep Foundations, 2017, New Orleans, LA, USA, (DFI)
Development of A Design Guideline for Bridge Pile Foundation Subjected to Liquefaction-Induced Lateral Spreading
Arash Khosravifar, Assistant Professor, Portland State University, Portland, OR, Jonathan Nasr, Graduate Student Researcher, Portland State University, Portland, OR
Effective-stress nonlinear dynamic analyses (NDA) were performed for piles in liquefiable sloped ground to assess how inertia and liquefaction-induced lateral spreading combine in long-duration vs. short- duration motions. A parametric study was performed using input motions from subduction and crustal earthquakes covering a wide range of motion durations. The NDA results showed that the pile demands increased due to 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.
|article #2826; publication #1037 (AM-2017)|