Project

Development of a Design Guideline for Bridge Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading

Goal: The overall objective of this research is to develop a design guideline for inelastic behavior of bridge pile foundations under combined effects of liquefaction-induced lateral spreading and superstructure inertia.
This project is sponsored by Deep Foundation Institute (DFI).

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Arash Khosravifar
added a research item
Effective-stress nonlinear dynamic analyses (NDA) were performed for a large-diameter reinforced concrete (RC) pile in multi-layered liquefiable sloped ground. The objective was to assess the effects of earthquake duration on the combination of inertia and liquefaction-induced lateral spreading. 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 head displacements increased under liquefied conditions, compared to nonliquefied conditions, due to liquefaction-induced lateral spreading. The NDA results were used to develop a displacement-based equivalent static analysis (ESA) method that combines inertial and lateral spreading loads for estimating elastic and inelastic pile demands.
Arash Khosravifar
added an update
Final results are published in DFI Journal. Full paper can be downloaded from link below:
 
Arash Khosravifar
added a research item
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.
Arash Khosravifar
added a project goal
The overall objective of this research is to develop a design guideline for inelastic behavior of bridge pile foundations under combined effects of liquefaction-induced lateral spreading and superstructure inertia.
This project is sponsored by Deep Foundation Institute (DFI).