LRFD Code Development for Foundation Structures in Korea- Reliability Analysis of Static Bearing Capacity Evaluation of Driven Steel Pipe Piles

摘要

Reliability analyses of the static bearing capacity analysis methods for driven steel pipe piles adopted in the Korean Standards for Foundation Structures have been performed as part of the efforts to develop the Load and Resistance Factor Design Code for foundation structures in Korea. Over 2,000 static load test data on driven steel pipe piles were collected from all around the country. After review of the load-displacement curves, subsurface investigation reports, and other related documents, only 43 load test data were found to be useful for the reliability analysis. These load test piles were sorted into two cases: pile tip on soil case and pile tip on rock case. Resistance bias factor statistics of each pile tip case were evaluated for the two static design methods. Reliability analysis was performed by two types of First Order Reliability Methods, Mean Value First Order Second (MVFOSM) method and Advanced First Order Second (AFOSM) method. AFOSM method resulted in a little larger reliability indices than MVFOSM method, but the difference was not significant.