Journal
COMPUTERS AND GEOTECHNICS
Volume 32, Issue 8, Pages 555-563Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2005.11.005
Keywords
genetic algorithms; finite element method; performance function; probability of failure; FOSM; Hasofer-Lind reliability index
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In application to numerical analysis of geotechnical problems, the limit-state surface is usually not known in any closed form. The probability of failure can be assessed via the so-called reliability index. A minimization problem can naturally be formed with an implicit equality constraint defined as the limit-state function and optimization methods can be used for such problems. In this paper, a genetic algorithm is proposed and incorporated into a displacement finite element method to find the Hasofer-Lind reliability index. The probabilistic finite element method is then used to analyse the reliability of classical geotechnical systems. The performance of the genetic algorithm (GA) is compared with simpler probability methods such as the first-order-second-moment Taylor series method. The comparison shows that the GA can produce the results fairly quickly and is applicable to evaluation of the failure performance of geotechnical problems involving a large number of decision variables. (c) 2006 Elsevier Ltd. All rights reserved.
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