Calibration of Resistance Factors for Drilled Shafts for the New FHWA Design Method : Research Project Capsule

Details

• Creators:
  Abu-Farsakh, Murad Y.
• Corporate Creators:
  Louisiana Transportation Research Center
• Subject/TRT Terms:
  • Piles (Supports)
  • Load factor
  • Precast concrete
  • Prestressed concrete
  • Piling (Civil engineering)
  • Load factor design
  • LRFD
  • Reliability analysis
  • CPT
  • Static analysis
  More +
• Publication/ Report Number:
  11-4GT
• Resource Type:
  Booklet/Pamphlet
• Geographical Coverage:
  Louisiana
• Edition:
  Research project capsule.
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The Federal Highway Administration (FHWA) and American Association of State ; Highway and Transportation Offi cials (AASHTO) require that all federally funded ; bridges including substructures be designed using the load and resistance ; factor design (LRFD) method after October 1, 2007. In compliance with this ; mandate, the Louisiana Transportation Research Center (LTRC) completed a ; research project to calibrate the resistance factors for driven piles and drilled ; shafts based on load tests available in engineering archives of the Louisiana ; Department of Transportation and Development (LADOTD). In this calibration, ; the FHWA (1999) design method recommended by AASHTO (2007) was used for ; drilled shaft design. Through searching the LADOTD load test database, only 16 ; cases of drilled shaft load tests were available at that time, among which only ; 11 tests were able to be used for the calibration. This number of load tests was ; not suffi cient to perform calibration of resistance factors for LRFD. Therefore, ; another 15 drilled shaft tests, with subsurface soil conditions closer to Louisiana ; soils, were collected from Mississippi to supplement the Louisiana load test ; database for statistical reliability analysis. A resistance factor of Φ = 0.5 was ; recommended for the drilled shaft design in Louisiana.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22280/dot_22280_DS1.pdf
• File Type:
  [PDF - 142.42 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:e2bc669257568846fb5544bbdaa768cb44509d423af3f6d917b83194f78d761664ce8a215011ec82adaf8d3cc84be85c529e565ef3e3121d52dae036169c350c