Calibration of Resistance Factors for Drilled Shafts for the New FHWA Design Method : Research Project Capsule
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2011-02-01
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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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