Present-generation resistance factors for foundations in load and resistance factor design (LRFD) do not necessarily reflect directly the variance in site-specific resistance and bias in making resistance estimates. The purpose of this paper is to describe a process whereby resistance factors can be determined from experimental data at a site and to demonstrate that process for driven piles at a specific site in overconsolidated clay. Eleven pipe piles were tested to failure in compression, and 28 cone penetrometer tests (CPTs) were performed near the piles. The CPT results were characterized through both a geostatistical method and a random sampling technique to estimate resistance factors for ultimate pile resistances using three CPT methods and two α-methods. A first-order, second-moment reliability method was applied using the interpreted bias characteristics of the design methods and the dispersion characteristics of the CPT and pile tests to relate resistance factors to selected reliability indexes. The resistance factors obtained for this site by this process were 0.50 to 0.62 for the three CPT methods and 0.30 to 0.55 for the ॅ-methods for a target reliability index of 3.5, depending on the value selected for the live load factor.


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    Title :

    Resistance Factors for Single Driven Piles from Experiments


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    1997-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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