Abstract
A variety of methods are available to estimate axial pile capacity for augered cast-in-place piles, however, these methods are generally limited to Allowable Stress Design procedures with little consideration of design reliability. Local and global datasets of shaft resistance design parameters have been evaluated to address the current lack of reliability-based design methods for augercast piling. This paper summarizes the results of static loading tests performed in Western Washington, installed within granular materials and with diameters and lengths ranging from 0.41 to 0.51 m and 9.5 to 29 m, respectively. The preparation of unit shaft resistances is discussed in consideration of strain dependent composite tangent moduli and observed residual loads. Relationships and their statistical characterization are proposed for unit shaft resistance as function of pile head displacement and relative density (i.e., Standard Penetration Resistance). These data are combined with an existing dataset to represent a global database of β-coefficients. Resistance factors for unit shaft resistance and β-coefficients at the strength limit calibrated using First-Order Second Moment and Monte Carlo methods are proposed for use in Load and Resistance Factor Design.
Published Version
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