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

File Language:
English


Details

  • Creators:
    Abu-Farsakh, Murad Y.
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • 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.

  • Format:
    PDF
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:e2bc669257568846fb5544bbdaa768cb44509d423af3f6d917b83194f78d761664ce8a215011ec82adaf8d3cc84be85c529e565ef3e3121d52dae036169c350c
  • Download URL:
  • File Type:
    Filetype[PDF - 142.42 KB ]
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