Abstract:Permanent ground deformation or ground lateral spreading is observed to be the main cause for the distress of piles embed-ded in liquefied ground. The purpose of this paper is to use uncoupled method for analysis of ground lateral spread effect on piles. The computer code, CYCLIC-1D (Elgamal, et al., 2002) developed at University of California at San Diego and accessible from the web, is used for lateral ground deformation estimation. Subsequently, the pile performance, treated as beam on Winkler foun-dation, is studied considering the effect of ground deformation obtained from CYCLIC-1D. Three centrifuge tested examples and one real field case were studied by the aforementioned method. Reasonable agreement was obtained between the predicted and the measured results.