Enhancement of Dynamic Beam of Nonlinear Winkler Foundation Models for Predicting Seismic Behavior of Pile Groups
This research is aimed at enhancing predictions of seismic behavior of pile foundations using dynamic beam on nonlinear Winkler foundation (BNWF) models. As a major BNWF component, a novel p-y element for soft clay is implemented, which incorporates unloading-reloading, soil resistance degradation, radiation damping, and gapping. Additionally, a multiple support excitation algorithm is employed to investigate time-varying seismic behavior of a 2×2 pile group in a profile of soft clay overlaying dense sand. Computed responses are validated against dynamic centrifuge tests, during which the pile group was subjected to a scaled (0.026 g) form of the Kobe 1995 earthquake. Reasonable agreement is obtained between the predicted and measured pile group responses in both time and frequency domains. Parametric analyses are then conducted to illustrate merits of the nonlinear dynamic p-y approach, leading to insights regarding aspects of pile group configurations such as pile head boundary condition and pile flexural stiffness. Study results demonstrate the effectiveness of the implemented soft clay p-y element and support the use of dynamic BNWF analysis methods for capturing seismic soil-pile-superstructure interaction.
- This paper was sponsored by TRB committee AFS30 Standing Committee on Foundations of Bridges and Other Structures.
Transportation Research Board,
- Taghavi, Amirata
- Davidson, Michael T.
- McVay, Michael C
- Transportation Research Board 98th Annual Meeting
- Location: Washington DC, United States
- Date: 2019-1-13 to 2019-1-17
- Date: 2019
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: 7p
- TRT Terms: Bridge design; Bridge foundations; Earthquake resistant design; Pile groups; Seismicity; Soil structure interaction
- Identifier Terms: Beam-on-Winkler Foundation
- Uncontrolled Terms: Soil layers
- Subject Areas: Bridges and other structures; Design; Geotechnology; Highways;
- Accession Number: 01697485
- Record Type: Publication
- Report/Paper Numbers: 19-04000
- Files: TRIS, TRB, ATRI
- Created Date: Dec 7 2018 9:29AM