Developing partial factors for serviceability limit state design of piles large-diameter bored

The serviceability requirement in terms of total settlement can be expressed in terms of predicted settlement and limiting tolerable settlement with necessary modifications for group effects and system effects. Similar to the LRFD methodology for ultimate limit design, partial factors can be applied to both limiting tolerable settlement and predicted settlement to attain a specified level of safety. In this paper, partial factors for serviceability design of large-diameter bored piles are developed using a first order reliability method, based on the statistics of prediction model performance, as well as the statistics of limiting tolerable settlement obtained previously. Five combinations of analysis methods for large-diameter bored piles in soils and six combinations ofanalysis methods for large-diameter bored piles socketed in rocks are considered. Copyright ASCE 2009