Time‐Domain Axial Response of Dynamically Loaded Pile Groups

A procedure for the time‐domain analysis of axial pile group response is developed. A pile‐soil‐pile interaction force is formulated in the time‐domain based on a previously developed dynamic, frequency‐domain Winkler model for a pile group. The response of the pile shafts in a group can be computed for one pile at a time individually in the time‐domain. The transfer matrix approach in the time‐domain, previously developed for a single pile, is applied with a minor modification to the pile group response analysis. Steady‐state responses of pile groups subjected to harmonic excitation are calculated using both the present time‐domain analysis and the previously developed frequency‐domain analysis. Good agreement between the results obtained by these two analyses validates the present approach. Numerical examples are provided for pile groups subjected to dynamic transient loading.