TY - GEN
T1 - Side resistance factor for serviceability-based design of drilled shafts in weak rock calibrated using O-cell test data
AU - Han, Jie
AU - Yang, Xiao Ming
AU - Parsons, Robert L.
AU - Henthorne, Robert W.
N1 - From October 1 st 2007, the new bridges on federal-aid funded projects are mandated to be designed by AASHTO LRFD Bridge Design Specifications. The resistance factors included in the current AASHTO specifications for foundation design are not all calibrated using field data. Plus, there is no calibrated resistance factor for serviceability-based design of drilled shafts.
PY - 2009/3/10
Y1 - 2009/3/10
N2 - From October 1st 2007, the new bridges on federal-aid funded projects are mandated to be designed by AASHTO LRFD Bridge Design Specifications. The resistance factors included in the current AASHTO specifications for foundation design are not all calibrated using field data. Plus, there is no calibrated resistance factor for serviceabilitybased design of drilled shafts. This paper presents a calibration of resistance factors for side resistance of drilled shafts in weak rock based on the statistical data collected from 19 O-cell tests in the mid-western United States. The field test data were used to determine the measured resistance at a settlement of 6.4mm (0.25 in.), which is commonly used in the bridge foundation design. The in-situ rock properties and the dimensions of drilled shafts were used to calculate the predicted resistance at the corresponding settlement using the FHWA method. The Monte Carlo method was selected to perform the calibration. Based on the normally distributed loads and the log normally distributed resistance from the test data, the side resistance factor was determined for a target reliability index of 3.0. Copyright ASCE 2009.
AB - From October 1st 2007, the new bridges on federal-aid funded projects are mandated to be designed by AASHTO LRFD Bridge Design Specifications. The resistance factors included in the current AASHTO specifications for foundation design are not all calibrated using field data. Plus, there is no calibrated resistance factor for serviceabilitybased design of drilled shafts. This paper presents a calibration of resistance factors for side resistance of drilled shafts in weak rock based on the statistical data collected from 19 O-cell tests in the mid-western United States. The field test data were used to determine the measured resistance at a settlement of 6.4mm (0.25 in.), which is commonly used in the bridge foundation design. The in-situ rock properties and the dimensions of drilled shafts were used to calculate the predicted resistance at the corresponding settlement using the FHWA method. The Monte Carlo method was selected to perform the calibration. Based on the normally distributed loads and the log normally distributed resistance from the test data, the side resistance factor was determined for a target reliability index of 3.0. Copyright ASCE 2009.
UR - https://doi.org/10.1061/41022(336)38
UR - https://www.scopus.com/pages/publications/69949145197
U2 - 10.1061/41022(336)38
DO - 10.1061/41022(336)38
M3 - Conference article
SN - 9780784410226
T3 - Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations
SP - 292
EP - 299
BT - Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations - Proceedings of Selected Sessions of the 2009 International Foundation Congress and Equipment Expo
T2 - Contemporary Topics in In Situ Testing, Analysis, and Reliability of Foundations - 2009 International Foundation Congress and Equipment Expo
Y2 - 15 March 2009 through 19 March 2009
ER -