Techno Press
Techno Press

Geomechanics and Engineering
  Volume 5, Number 6, December 2013 , pages 519-540
DOI: https://doi.org/10.12989/gae.2013.5.6.519
 

Optimum pile arrangement in piled raft foundation by using simplified settlement analysis and adaptive step-length algorithm
Keiji Nakanishi and Izuru Takewaki

 
Abstract
    This paper presents an optimal design method for determining pile lengths of piled raft foundations. The foundation settlement is evaluated by taking into account the raft-pile-soil interaction. The analysis of settlement is simplified by using Steinbrenner's equation. Then the total pile length is minimized under the settlement constraint. An extended sequential linear programming technique combined with an adaptive step-length algorithm of pile lengths is used to solve the optimal design problem. The accuracy of the simplified settlement analysis method and the validity of the obtained optimal solution are investigated through the comparison with the actual measurement result in existing piled raft foundations.
 
Key Words
    piled raft foundation; vertical load; optimum design; pile arrangement; settlement analysis; observed data; large-step numerical sensitivity
 
Address
(1) Keiji Nakanishi: Institute of Technology, Shimizu Corporation, Koto-ku, Tokyo 135-8530, Japan;
(2) Izuru Takewaki: Department of Architecture and Architectural Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan.
 
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