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Region-Specific Load Transfer Model for Augered Cast-in-Place Piles in Granular Soils
The estimation of displacements of augered cast-in-place (ACIP) piles is often based on load transfer models that have been developed for other foundation types, such as drilled shafts or driven piles. Owing to differences in construction procedure from drilled shafts, such as providing continuous support of the drilled cavity and the delivery of grout under pressure, ACIP piles may transfer load from its shaft differently than drilled shafts. This paper describes the development of an empirical t-z model based on static loading tests on instrumented ACIP piles installed in Western Washington. An existing q-z model is paired with the new t-z model to make estimates of load transfer profiles and load–displacement curves of the instrumented piles. The load transfer and load–displacement curves are compared to results derived using the existing O’Neill and Reese (1999) and Vijayvergia (1977) models. In order to make an independent assessment of the model accuracy, comparisons are made to the load–displacement curves of several non-instrumented ACIP piles tested in Western Washington. The region-specific load transfer model is shown to provide more accurate estimates of ACIP pile performance than those existing, and is recommended for ACIP piles constructed in Western Washington.
Region-Specific Load Transfer Model for Augered Cast-in-Place Piles in Granular Soils
The estimation of displacements of augered cast-in-place (ACIP) piles is often based on load transfer models that have been developed for other foundation types, such as drilled shafts or driven piles. Owing to differences in construction procedure from drilled shafts, such as providing continuous support of the drilled cavity and the delivery of grout under pressure, ACIP piles may transfer load from its shaft differently than drilled shafts. This paper describes the development of an empirical t-z model based on static loading tests on instrumented ACIP piles installed in Western Washington. An existing q-z model is paired with the new t-z model to make estimates of load transfer profiles and load–displacement curves of the instrumented piles. The load transfer and load–displacement curves are compared to results derived using the existing O’Neill and Reese (1999) and Vijayvergia (1977) models. In order to make an independent assessment of the model accuracy, comparisons are made to the load–displacement curves of several non-instrumented ACIP piles tested in Western Washington. The region-specific load transfer model is shown to provide more accurate estimates of ACIP pile performance than those existing, and is recommended for ACIP piles constructed in Western Washington.
Region-Specific Load Transfer Model for Augered Cast-in-Place Piles in Granular Soils
Adami, Nasim (author) / Stuedlein, Armin W. (author)
IFCEE 2015 ; 2015 ; San Antonio, Texas
IFCEE 2015 ; 712-722
2015-03-17
Conference paper
Electronic Resource
English
REGION-SPECIFIC LOAD TRANSFER MODEL FOR AUGERED CAST-IN-PLACE PILES IN GRANULAR SOILS
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