Implementation of LRFD of Drilled Shafts in Louisiana
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Abstract
This paper presents reliability-based analyses for the calibration of resistance factor for axially loaded drilled shafts. A total of 16 cases of drilled-shaft load tests were collected from the Louisiana Department of Transportation and Development (LADOTD) archives. Only 11 out of the 16 cases met the Federal Highway Administration (FHwA) failure criterion. Because of the limited number of available drilled-shaft cases in Louisiana, additional 15 drilled-shaft cases were collected from a neighboring state, Mississippi, which has subsurface soil conditions similar to Louisiana soils. A database of 26 drilled shafts representing the typical design practice in Louisiana was created for a statistical reliability analysis. Predictions of load-settlement behavior of drilled shafts from soil borings were determined using the FHwA design method through the SHAFT computer program. Measured drilled-shaft axial nominal resistance was determined from either the Osterberg cell (O-cell) test or the conventional top-down static load test. Statistical analyses were performed to compare the predicted ultimate drilled-shaft nominal axial resistance and the measured nominal resistance. Results show that the selected design method underestimates the measured drilled-shaft resistance by an average of 17%. The Monte Carlo-simulation method was selected to perform the LRFD calibration under strength I limit state. Total resistance factors for different reliability indexes () were determined and compared with those available in literature. The LRFD calibration showed that the FHwA design method has a resistance factor () of 0.60 at a target reliability index () of 3.0.
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Acknowledgments
This research project is funded by the LTRC (LTRC Project No. 07-2GT) and LADOTD (State Project No. 736-99-1408). The authors gratefully acknowledge the support of Mark Morvant and Zhongjie Zhang of LTRC. The authors appreciate the value comments and suggestions from the reviewers and the editor.
References
AASHTO. (1998). LRFD highway bridge design specifications, AASHTO, Washington, DC.
AASHTO. (2004). LRFD bridge design specifications, 3rd Ed., AASHTO, Washington, DC.
AASHTO. (2007). LRFD bridge design specifications, 4th Ed., AASHTO, Washington, DC.
Abu-Farsakh, M., and Titi, H. (2007). “Probabilistic CPT method for estimating the ultimate capacity of friction piles.” Geotech. Test. J.GTJODJ, 30(5), 387–398.
Abu-Farsakh, M. Y., and Yu, X. (2010). “Interpretation criteria to evaluate resistance factors for axial load capacity of drilled shafts.” Transportation Research Record 2202, Transportation Research Board, Washington, DC, 20–31.
Abu-Farsakh, Y. M., Yu, X., Yoon, S., and Tsai, C. (2010). “Calibration of resistance factors needed in the LRFD design of drilled shafts.” Rep. No. 470, Louisiana Transportation Research Center, Baton Rouge, LA.
Allen, T. M. (2004). “Development of a new pile driving formula and its calibration for load and resistance factor design.” Transportation Research Record 2004, Transportation Research Board, Washington, DC, 20–27.
Allen, T. M. (2005a). “Development of the WSDOT pile driving formula and its calibration and resistance factor design (LRFD).” Publication FHwA-WA-RD 610.1, FHwA, Washington State Dept. of Transportation, Olympia, WA.
Allen, T. M. (2005b). “Development of geotechnical resistance factors and downdrag load factors for LRFD foundation strength limit state design.” Publication FHwA-NHI-05-052, FHwA, Washington, DC.
Allen, T. M., Nowak, A., and Bathurst, R. (2005). “Calibration to determine load and resistance factors for geotechnical and structural design.” Publication TRB Circular E-C079, Transportation Research Board, Washington, DC.
Baecher, G. B., and Christian, J. T. (2003). Reliability and statistics in geotechnical engineering, Wiley, West Sussex, England.
Barker, R. M., Duncan, J. M., Rojiani, K. B., Ooi, P. S. K., Tan, C. K., and Kim, S. G. (1991). “Manuals for the design of bridge foundations.” Transportation Research Board, NCHRP-343, National Research Council, Washington, DC.
Brown, D. A., Turner, J. P., and Castelli, R. J. (2010). “Drilled shafts: Construction procedures and LRFD design methods.” Publication No. FHwA-NHI-10-016; GEC No. 10, Federal Highway Administration, Washington, DC.
Chen, Y.-J., and Kulhawy, F. H. (2002). “Evaluation of drained axial capacity for drilled shafts.” Deep foundations 2002: An international perspective on theory, design, construction, and performance, O’Neill, M. W. and Townsend, F. C., eds, ASCE, Reston, VA, 1200–1214.
Deep Foundations Institute (DFI). (1990). Guidelines for the interpretation and analysis of the static loading test, 1st Ed., DFI, Sparta, NJ.
Fishman, G. S. (1995). Monte Carlo: Concepts, algorithms, applications, Springer-Verlag, New York.
Hansell, W. C., and Viest, I. M. (1971). “Load factor design for steel highway bridges.” AISC Eng. J.EJASAR, 8(4), 113–123.
Harr, M. E. (1996). Reliability-based design in civil engineering, Dover, Mineola, NY.
Kim, J., Gao, X., and Srivatsan, T. S. (2004). “Modeling of void growth in ductile solids: Effects of stress triaxiality and initial porosity.” Eng. Fract. Mech.EFMEAH, 71(3), 379–400.
Kuo, C. L., McVay, M., and Birgisson, B. (2002). “Calibration of load and resistance factor design.” Transportation Research Record 1808, Transportation Research Board, Washington, DC, 108–111.
Liang, R., and Li, J. (2009). “Resistance factors calibrated from FHwA drilled shafts static top-down test data base.” Proc. of Selected Sessions of the 2009 Int. Foundation Congress and Equipment Expo, ASCE, Reston, VA.
McVay, M., Birgisson, B., Nguyen, T., and Kuo, C. (2002). “Uncertainty in LRFD phi, , factors for driven prestressed concrete piles.” Transportation Research Record 1808, Transportation Research Board, Washington, DC, 99–107.
McVay, M., Birgisson, B., Zhang, L., Perez, A., and Putcha, S. (2000). “Load and resistance factor design (LRFD) for driven piles using dynamic methods—a Florida perspective.” Geotech. Test. J.GTJODJ, 23(1), 55–66.
McVay, M. Jr., Ellis, R., Birgisson, B., Consolazio, G., Putcha, S., and Lee, S. (2003). “Load and resistance factor design, cost, and risk: Designing a drilled-shaft load test program in Florida limestone.” Transportation Research Record 1849, Transportation Research Board, Washington, DC, 98–106.
Misra, A., and Roberts, L. A. (2009). “Service limit state resistance factors for drilled shafts.” GeotechniqueGTNQA8, 59(1), 53–61.
Nowak, A. S. (1999). “Calibration of LRFD bridge design code.” Publication NCHRP-368, Transportation Research Board, Washington, DC.
O’Neill, M. W., and Reese, L. C. (1999). “Drilled shafts: Construction procedures and design methods.” Publication FHwA-IF-99-025, FHwA, Washington, DC.
O’Neill, M., Townsend, F., Hassan, K., Buller, A., and Chang, P. (1996). “Load transfer for drilled shafts in intermediate geomaterials.” FHwA-RD-95-172, FHwA, Washington, DC.
Paikowsky, S. G. (2004). “Load and resistance factor design (LRFD) for deep foundations.” Publication NCHRP-507, Transportation Research Board, Washington, DC.
Reese, L. C., and O’Neill, M. W. (1988). “Drilled shafts: Construction procedures and design methods.” Report No. FHwA-HI-88-042, Federal Highway Administration, Washington, DC.
Reese, L. C., Wang, S. T., and Arrellaga, J. A. (2001). “A program for the study of drilled shafts under axial loads.” SHAFT version 5.0 for Windows (CD-ROM), Ensoft, Austin, TX.
Schmertmann, J. H., and Hayes, J. A. (1997). “The Osterberg cell and bored pile testing—a symbiosis.” 3rd Int. Geotechnical Engineering Conf., Cairo Univ., Cairo, Egypt, 139–166.
Withiam, J. et al. (1998). “Load and resistance factor design (LRFD) of highway bridge substructures.” FHwA-HI-98-032, FHwA, Washington, DC.
Yang, L., and Liang, R. (2006). “Incorporating setup into load and resistance factor design of driven piles in sand.” 86th Annual Meeting of the Transportation Research Board, Washington, DC.
Yang, X., Han, J., Parsons, R., and Henthorne, R. (2008a). “Resistance factors for drilled shafts in weak rocks based on O-cell test data.” 87th Annual Meeting of the Transportation Research Board, Washington, DC.
Yang, X. M., Han, J., Parsons, R. L., and Henthorne, R. (2008b). “Resistance factors for drilled shafts in weak rocks based on O-cell test data.” Transportation Research Record 2045, Transportation Research Board, Washington, DC, 62–67.
Zhang, L., Tang, W. H., and Ng, C. W. W. (2001). “Reliability of axially loaded driven pile groups.” J. Geotech. Geoenviron. Eng.JGGEFK, 127(12), 1051–1060.
Zhang, L. M., Li, D. Q., and Tang, W. H. (2005). “Reliability of bored pile foundations considering bias in failure criteria.” Can. Geotech. J.CGJOAH, 42, 1086–1093.
Information & Authors
Information
Published In
Journal of Infrastructure Systems
Volume 18 • Issue 2 • June 2012
Pages: 103 - 112
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Nov 4, 2009
Accepted: Oct 6, 2011
Published online: Oct 7, 2011
Published in print: Jun 1, 2012
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