Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)
Correlation of safety measures from deterministic and reliability-based approaches for pile Foundation Design
Dr. R.B. Abmalik & Dr. T.F. Wolff
An algorithm is developed to correlaqte the basic concepts and procedures commonly used in deterministic design of axially loaded piles in cohesionless soil with reliability based design methods. The derivation of the algorithm uses the commonly accepted "standard" static forumula (Beta-Method) and the in-situ soil exploration data from Standard Penetration test (SPT N-values). For the determination of the service load in the design of a single pile foundation, safety measures are frequently applied to the predicted capacity. At any particular service load, this study presents the correlation between the conventional deterministic safety measure (factor of safety) and reliability basd safety measures (reliability index, central factor of safety and the probability of failure) within a systematic and rational framework. Interrelation equations and design charts are derived and calibrated. Consequently, at the recommended factor of safety or reliability index, the value of service load can be determined and interpreted by either deterministic or reliability based approaches. An example as how to use the developed design chart is also demonstrated.
|article #824; publication #36 (IC-1994)|