Influence of sample size, and strength variability on LRFD resistance factors
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abstract
The influence of sample size, and insitu test device variability on the computed LRFD axial resistance factors, , for driven piles is investigated. Specifically, the variability in LRFD resistance factors, , is shown to be directly related to both the size and statistics (bias, and standard deviation) of the measured/predicted axial pile/shaft database using Monte Carlo simulations. Similarly, it is revealed that a pile capacity predicted variability may be lower than the variability introduced through the use of insitu device strength correlations. Both the database size and insitu strength correlation variability may explain the lower LRFD resistance factors, obtained from databases than through fitting with ASD Factors of Safety.
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Geotechnical Engineering for Transportation Projects
