DYNAMIC INTERACTION FACTOR OF PILED RAFT FOUNDATION SUBJECTED TO VERTICAL LOADING

Authors

  • Hiroshi Nagai

Keywords:

Piled raft foundation, Dynamic impedance, Interaction factor, Dynamic soil-structure interaction

Abstract

In this paper, a dynamic interaction factor between a raft and a pile group that constituted a
piled raft foundation subjected to vertical loading is investigated. Because, if the dynamic interaction factor
can be evaluated, the dynamic impedance of the piled raft foundation can be easily calculated from the dynamic
impedance of a spread foundation and a pile foundation. The dynamic interaction factor is formulated as an
arbitrary function in the frequency domain, based on the relationship of the dynamic impedance between the
piled raft, the spread and the pile foundation obtained by parametric numerical analyses with various changes
in the foundation configuration and the ground condition. Moreover, the coefficients used in the function have
related the width of the foundation or the stiffness ratio of the spread and pile foundations. It is confirmed that
the results of the simplified method using the interaction factor are in good agreement even for the dynamic
impedance of piled raft foundation with conditions similar to the spread foundation or the pile foundation.

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Published

2020-05-30

How to Cite

Hiroshi Nagai. (2020). DYNAMIC INTERACTION FACTOR OF PILED RAFT FOUNDATION SUBJECTED TO VERTICAL LOADING. GEOMATE Journal, 18(69), 168–175. Retrieved from https://geomatejournal.com/geomate/article/view/1529

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Articles