Assessment of current AASHTO LRFD methods for static pile capacity analysis in Rhode Island soils.

Details

• Creators:
  Bradshaw, Aaron ; Davis, Sean
• Corporate Creators:
  University of Rhode Island
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Piles (Supports)
  • Pile foundations
  • Bearing capacity
  • Load tests
  • Static loads
  • Bridge design
  • Silts
  • Resistance (Mechanics)
• Publication/ Report Number:
  URITC PROJECT NO. 000149
• Resource Type:
  Tech Report
• Geographical Coverage:
  Rhode Island
• Corporate Publisher:
  University of Rhode Island. Transportation Center
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Design ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology
• 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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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26222/dot_26222_DS1.pdf
• File Type:
  [PDF - 1012.65 KB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4011e0156ea54969f372e7b85200c94ea8b3eb65465778959abee573637a69d411c129a0312d84bd5cb38da02ed8109a0e6121020f6e9123d841b9bdd7df730a