An Optimal Design of Steel Pipe Pile Foundation

by Nobutaka Ishikawa, Natl Defense Acad, Japan,
Takayoshi Tanaka, Natl Defense Acad, Japan,
Satoshi Katsuki, Natl Defense Acad, Japan,
Takashi Tazoh, Natl Defense Acad, Japan,

Document Type: Proceeding Paper

Part of: Computer Utilization in Structural Engineering


This paper presents an optimal design method for the steel pipe pile foundation of bridge pier using a nonlinear programming. It is firstly assumed that an imaginary wall model behaves in a similar manner as a real pile line. The section properties of the imaginary wall model are estimated by selecting the minimum total cost as an objective function and the design criteria of pile in the specification of Japanese road bridge code as the constraints. Then, the design variables, i.e., pile diameter, thickness and pile number are determined by picking up the pile group with the minimum sectional area from the discrete data list of the steel pipe pile so that the active constraints in the wall model may be satisfied. Finally, all design variables are checked if all design criteria are satisfied or not by the deformation method of pile analysis.

Subject Headings: Foundation design | Steel piles | Micro piles | Walls | Steel pipes | Pipelines | Pipe piles | Plastic design

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