Engineers Australia

Practical Approach For Piled Raft Stiffness Estimation

Harry G Poulos

Abstract

This paper makes use of the expressions of Randolph (1994) to derive simple expression for the proportion of raft stiffness that can be added to the pile group stiffness in order to estimate the overall stiffness of a piled raft foundation system. Simple methods of estimating raft and piled group stiffness values are summarized, and an example illustrating the application of the approach is presented. Finally, the approach is used to estimate the settlement of a piled raft foundation supporting a high-rise tower in the city of Frankfurt.