Development of Partial Factors for Serviceability Limit State Design of Large-diameter Bored Piles

Abstract

The serviceability requirement of foundations in terms of total settlement can be expressed using predicted settlement and limiting tolerable settlement with necessary modifications for group effects and system effects. Similar to the limit state design methodology for ultimate limit sates, 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 largediameter bored piles are developed using a first order reliability method, based on the statistics of prediction model performance, as well as statistics of limiting tolerable settlement obtained previously. Five combinations of analysis methods for large-diameter bored piles in soils and six combinations of analysis methods for large-diameter bored pile socketed in rocks are considered.

Keywords:

• First Order Reliability Method
• Large-diameter Bored Piles
• Limit State Design
• Partial Factors
• Reliability
• Serviceability
• Uncertainty