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Design of raft–pile foundation using combined optimization and finite element approach
Author(s) -
Valliappan S.,
Tandjiria V.,
Khalili N.
Publication year - 1999
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/(sici)1096-9853(19990825)23:10<1043::aid-nag40>3.0.co;2-1
Subject(s) - pile , finite element method , foundation (evidence) , raft , displacement (psychology) , structural engineering , optimal design , mathematical optimization , engineering design process , sensitivity (control systems) , constraint (computer aided design) , mathematics , engineering , mechanical engineering , geometry , psychology , statistics , archaeology , electronic engineering , copolymer , psychotherapist , history , polymer , chemistry , organic chemistry
This paper describes the application of a structural optimization approach combined with the finite element method for the optimal design of a raft–pile foundation system. The analysis takes into account the non‐linear behaviour of the soil medium and the piles. For the optimization process, the sensitivity analysis is carried out using the approximate semi‐analytical method while the constraint approximation is obtained from the combination of extended Bi‐point and Lagrangian polynomial approximation methods. The objective function of the problem is the cost of the foundation. The design variables are the raft thickness, cross‐section, length and number of piles. The maximum displacement and differential displacement are selected as the constraints. The proposed method is shown to achieve an optimum design of raft–pile foundation efficiently and accurately. Copyright © 1999 John Wiley & Sons, Ltd.