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Earthquakes and Structures
  Volume 11, Number 1, July 2016, pages 141-163

Model verification and assessment of shear-flexure interaction in pile foundations
Anne Lemnitzer, Eduardo Nunez and Leonardo M. Massone

    Fiber models have been developed and applied to various structural elements such as shear walls, beams and columns. Only scarcely have fiber models been applied to circular foundation systems such as cast in drilled holes shafts (CIDH). In pile foundations with constraint head boundary conditions, shear deformations can easily contribute to the lateral pile response. However, soil structure interaction formulations such as the p-y method, commonly used for lateral pile design, do not include structural shear deformations in its traditional derivation method. A fiber model that couples shear and axial-bending behavior, originally developed for wall elements was modified and validated on circular cross sections (columns) before being applied to a 0.61 m diameter reinforced concrete (RC) pile with fixed head boundary conditions. The analytical response was compared to measured test results of a fixed head test pile to investigate the possible impact of pile shear deformations on the displacement, shear, and moment profiles of the pile. Results showed that shear displacements and forces are not negligible and suggest that nonlinear shear deformations for RC piles should be considered for fixed-head or similar conditions. Appropriate sensor layout is recommended to capture shear deformation when deriving p-y curves from field measurements.
Key Words
    piles; lateral loading; soil-pile interaction; shear deformations; reinforced concrete
Anne Lemnitzer: Department of Civil Engineering, Univ. of California Irvine, 4135 Eng. Gateway, Irvine, CA, 92697, USA

Eduardo Nunez: Independent Structural Engineer, Santiago, Chile

Leonardo M. Massone: Department of Civil Engineering, University of Chile, Santiago, Blanco Encalada 2002, Santiago, Chile

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