Journal
SOILS AND FOUNDATIONS
Volume 58, Issue 4, Pages 1059-1067Publisher
JAPANESE GEOTECHNICAL SOC
DOI: 10.1016/j.sandf.2018.04.004
Keywords
Pile group effect; Composite pile group; Three-dimensional finite element method; P-multiplier (IGC: E-12)
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Pile group effects of a composite pile group that consists of a group of subgroups are investigated based on a series of static pushover analysis with the help of the nonlinear three-dimensional finite element method (FEM). The numerical result suggests that there is an interaction between subgroups as well as an interaction within each subgroup; the former interaction effect is very similar to the latter if the distance between subgroups is normalized with respect to an equivalent pile diameter of each subgroup. A simplified method to estimate pile group effects of a composite pile group is then proposed in which the interaction effects within and between the subgroups are both accounted for using the same P-multiplier approach commonly employed for a pile group. The P-multipliers estimated by the proposed method show a fairly good agreement with those estimated from the FEM analyses. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
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