United States Department of Transportation
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Assessment of current AASHTO LRFD methods for static pile capacity analysis in Rhode Island soils.
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2013-07-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
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Abstract:This report presents an assessment of current AASHTO LRFD methods for static pile capacity analysis in Rhode
Island soils. Current static capacity methods and associated resistance factors are based on pile load test data in sands
and clays. Some regions of Rhode Island including Providence and Narragansett Bay are underlain by very silty
soils. Therefore, the use of the AASHTO pile capacity methods is uncertain in these soils, which can have important
safety or cost implications. To address this objective static loading test data were compiled from recent bridge
projects within the state. The capacity of the test piles were also predicted using the Nordlund method and SPT
method as specified by AASHTO. The measured and predicted capacities were compared to assess both the accuracy
and the precision of the methods as well as calibrate preliminary resistance factors. The results showed that
capacities of high-displacement piles were overpredicted in the majority of the cases. Gross overpredictions were
observed at the Jamestown bridge site. Preliminary resistance factors of 0.20 and 0.42 were calibrated for the
Nordlund and SPT methods, respectively, for high-displacement piles driven to glacial till in Providence.
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