Graduate Thesis Or Dissertation
 

Development of an ACIP pile-specific load-displacement model

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tb09j882n

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  • Augered cast-in-place piles, also known as ACIP piles, have been used for more than seven decades in the United States and have gained in popularity due to their relatively quick installation and cost-effectiveness. Owing to the reduced impact on the neighboring environment as compared to some other deep foundation installation methods, ACIP piles are appropriate for use in urban areas. Although there has been an increase in application of ACIP piles, relatively little research on this type of pile has been performed as compared to similar deep foundations, such as drilled shafts. The insufficient experimental work on ACIP pile behavior and lack of ACIP pile specific load- displacement models have led practicing engineers to use the results and methodologies from drilled shafts. An example of this is the use of t-z and q-z based load transfer models from drilled shaft-specific relationships to estimate the load-displacement behavior of ACIP piles. Such applications can result in an underestimation of shaft resistance and consequently disagreement between the predicted and measured load-displacement behavior of the ACIP piles. This thesis evaluates the ability of currently used load-displacement models to estimate the measured load-displacement behavior of ACIP piles. Also, a new empirically-based ACIP pile-specific t-z model is proposed that, in combination with the O’Neill and Reese (1999) q-z model and ACIP pile-specific toe bearing resistance model, forms an ACIP pile specific load-displacement model. Experiments of instrumented ACIP piles installed in the granular soils of Western Washington were used to develop the ACIP pile specific t-z model. Comparison between the results from the currently used load-displacement models with the proposed model showed that the proposed model provides an improvement in the prediction of the load-displacement behavior of ACIP piles. Finally, an analysis of variability is performed using the Monte Carlo Simulation with the sample probability distributions of the uncertain variables in load-displacement model. These analyses result in provide a set of possible loads for a number of common service level displacements, which are reported as cumulative density function (CDF) curves. The CDF curves for loads corresponding to a displacement considered can be a useful tool in design procedure of ACIP piles.
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