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Geomechanics and Engineering
  Volume 17, Number 3, February28 2019 , pages 287-294

Modeling of pile end resistance considering the area of influence around the pile tip
Junichi Hyodo, Yoshio Shiozaki, Yukio Tamari, Osamu Ozutsumi and Koji Ichii

    The finite element method (FEM) is widely used to evaluate the seismic performance of pile-supported buildings. However, there are problems associated with modeling the pile end resistance using the FEM, such as the dependence on the mesh size. This paper proposes a new method of modeling around the pile tip to avoid the mesh size effect in two-dimensional (2D) analyses. Specifically, we consider the area of influence around the pile tip as an artificial constraint on the behavior of the soil. We explain the problems with existing methods of modeling the pile tip. We then conduct a three-dimensional (3D) analysis of a pile in various soil conditions to evaluate the area of influence of the soil around the pile tip. The analysis results show that the normalized area of influence extends approximately 2.5 times the diameter of the pile below the pile tip. Finally, we propose a new method for modeling pile foundations with artificial constraints on the nodal points within the area of influence. The proposed model is expected to be useful in the practical seismic design of pile-supported buildings via a 2D analysis.
Key Words
    area of influence; 2D analysis; pile-supported building
Junichi Hyodo: Civil Engineering Division, Tokyo Electric Power Services Co. Ltd, Japan, 7-12 Shinonome 1-chome Koto-ku, Tokyo 135-0062, Japan

Yoshio Shiozaki: Steel Research Laboratory, JFE Steel Corporation, Japan

Yukio Tamari: Business Incubation Unit, Tokyo Electric Power Services Co. Ltd, Japan

Osamu Ozutsumi: Meisosha Corporation, Japan

Koji Ichii: Faculty of Societal Safety Sciences, Kansai University, Japan

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