Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)
Finite Element Numerical Analysis to Evaluate the Lateral Behavior of Three Pile Group Configurations
Murad Abu Farsakh, Research Professor, Ahmad Souri, Research Associate and George Voyiadjis, Boyd Professor
This paper compares the static lateral behavior of three pile group configurations: vertical piles, battered piles, and a mix of vertical and battered piles. The study is based on a previous investigation for the lateral behavior of M19 battered pile group at the I-10 Twin Span Bridge, in which a static lateral load test and 3D finite element (FE) simulation was conducted. The battered pile group FE model was used as a basis for developing the FE models of vertical and mixed pile groups in the current study. The nonlinear material behavior was accounted for using elastoplastic constitutive models such as the Concrete Damaged Plasticity model and the Anisotropic Modified Camclay model. The pile groups behavior was investigated in terms of load-displacement, axial reaction, and p-y curves and p-multipliers. The results showed that the battered and mixed pile group stiffness was 120% and 50% higher than the vertical pile group, respectively. The largest lateral load share was unevenly distributed among the rows and different in each pile group configuration. For the axial reaction, the significant percentage was mainly in two rows in the vertical and the battered pile groups, while it was in four rows in the mixed pile group. The back-calculated p-multipliers was found different in each pile group with the highest values in the battered pile group.
|article #3029; publication #1040 (ROME-2018)|