Nonlinear lateral response of RC pile in sand: centrifuge and numerical modelling

Rui Zhao, Anthony Kwan Leung (Lead / Corresponding author), Jonathan Knappett, Scott Robinson, Andrew Brennan

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Abstract

Centrifuge modelling has been considered as an effective means of studying flexural soil-pile interaction, yet the conventional use of elastic material to model a reinforced concrete (RC) pile prototype is unable to reproduce the important nonlinear quasi-brittle behavior. It also remains a challenge to numerically model the soil-pile interaction due to the nonlinearity of both the soil and pile materials. This paper presents a small-scale model RC pile for testing soil-structure interaction under lateral pile-head loading in sand within a centrifuge. Accompanying non-linear finite-element numerical modelling is also presented to back-analyze the centrifuge observations and explore the influence of the constitutive models used. The physical model RC pile is able to (i) reproduce the pile failure mechanism by forming realistic tension crack patterns and plastic hinging and (ii) give hardening responses upon flexural loading. Comparisons of measured and predicted results demonstrate that for the laterally-loaded pile problem, the load-displacement response can be well approximated by models which do not incorporate strain softening, even though the soil behavior itself exhibits a strong softening response.
Original languageEnglish
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume147
Issue number6
Early online date25 Mar 2021
DOIs
Publication statusE-pub ahead of print - 25 Mar 2021

Keywords

  • Pile foundation
  • Reinforced concrete
  • Centrifuge modelling
  • Numerical modelling

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