Design-oriented seismic soil-pile-superstructure interaction analysis using a dynamic p-y method

摘要

The dynamic p-y method (based on the Winkler model) is a useful approach for designing bridges to resist seismic events. Further, this approach facilitates characterization of nonlinear dynamic soil-structure interaction while offsetting time and expertise that would otherwise be required to develop continuum-based models. Herein, the nonlinear Winkler method is validated-within bridge FEA software-and employed to demonstrate computation of dynamic bridge foundation member response to seismic loading. Specifically, piles driven in soft clay sites (with specified shear wave velocities) are investigated when subjected to scaled base accelerations derived from the Taft 1952 and Northridge 1994 earthquakes. Superstructure resistance, soil degradation, soil mass participation, and gapping are incorporated into the numerical models. Additionally, insights are made regarding the effect of selected parameter variations on design-relevant structural response quantities (e.g., maximum displacements). This study highlights extant capabilities in design-oriented FEA software for assessing seismic responses of bridge pier foundations.