Evaluation of Regionally Calibrated Load and Resistance Factor-Design Method Used for Driven-Steel H-Piles
Publication: Journal of Bridge Engineering
Volume 25, Issue 8
Abstract
Since October 2007, the Federal Highway Administration (FHWA) has required the implementation of LRFD methods in all new bridge designs, including pile design. The resistance factors provided nationally for LRFD of driven piles are relatively conservative. Therefore, the Iowa Department of Transportation and Iowa State University collaborated and established regional resistance factors that are more efficient than those provided in the AASHTO Specifications, which are complemented with improved construction control methods. Iowa's LRFD guidelines for piles have been used in enough completed projects since 2012, allowing an assessment of the accuracy of the regional resistance factors and construction control methods. The piles used in these projects included both end-bearing piles in rock and friction piles. The friction piles were installed in cohesive, noncohesive, and mixed soil sites. The evaluation for the different pile categories and soil types found that the regional LRFD resistance factors developed were successfully applied in Iowa's driven pile design and effectively reduced the piles' contract lengths, resulting in cost–benefit over AASHTO's recommended resistance factors.
Get full access to this article
View all available purchase options and get full access to this article.
References
AASHTO. 2013. AASHTO LRFD bridge design specifications: Customary U.S. units, 6th edition with 2012 and 2013 interim revisions and 2012 Errata. Washington, DC: AASHTO.
AbdelSalam, S. S., S. Sritharan, and M. T. Suleiman. 2011a. “LRFD resistance factors for design of driven H-piles in layered soil.” J. Bridge Eng. 16 (6): 739–748. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000253.
AbdelSalam, S. S., S. Sritharan, M. T. Suleiman, K. W. Ng, and M. J. Roling. 2011b. Development of LRFD design procedures for bridge pile foundations in Iowa—Vol. 3: Recommended resistant factors with consideration to construction control and setup. Final Rep. III for IHRB Projects: TR-573, TR-583 and TR-584. Ames, IA: Institute of Transportation, Iowa State Univ.
Green, D., K. W. Ng, K. F. Dunker, S. Sritharan, and M. Nop. 2012. Development of LRFD procedures for bridge pile foundations—Vol. 4: Design guide and track examples. Final Rep. to Iowa Highway Research Board. IHTB Projects TR-573, TR-583, and TR-584. Ames, IA: Institute of Transportation, Iowa State Univ.
Iowa DOT (Iowa Department of Transportation). 2011. Iowa LRFD bridge design manual. Ames, IA: Iowa DOT.
Iowa DOT (Iowa Department of Transportation). 2012. Standard specifications for highway and bridge construction. Ames, IA: Iowa DOT.
Moore, J. 2007. AASHTO LRFD oversight committee (OC) - update 2007. New Hampshire DOT, AASHTO Load and Resistance Factor Design (LRFD) Bridge Specifications. Washington, DC: AASHTO.
Ng, W. K., M. Roling, S. S. AbdelSalam, M. T. Suleiman, and S. Sritharan. 2013a. “Pile setup in cohesive soil. I: Experimental investigation.” J. Geotech. Geoenviron. Eng. 139 (2): 199–209. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000751.
Ng, W. K., and S. Sritharan. 2014. “Verification of LRFD approach for piles in sand and mixed soils.” Transportation Research Board 93rd Annual Meeting (No. 14-2356), 1–19. Ames, IA: Iowa State Univ.
Ng, K. W., S. Sritharan, K. F. Dunker, and D. DeBoer. 2012. “Verification of recommended load and resistance factor design and construction of piles in cohesive soils.” Transp. Res. Rec. 2310 (1): 49–58. https://doi.org/10.3141/2310-06.
Ng, W. K., M. T. Suleiman, M. J. Roling, S. S. AbdelSalam, and S. Sritharan. 2011. Development of LRFD design procedures for bridge pile foundations in Iowa—Vol. 2: Field testing of steel piles in clay, sand and mixed soils. Final Rep. II for IHRB Projects: TR-573, TR-583 and TR-584. Ames, IA: Institute of Transportation, Iowa State Univ.
Ng, K. W., M. T. Suleiman, and S. Sritharan. 2013b. “Pile setup in cohesive soil. II: Analytical quantifications and design recommendations.” J. Geotech. Geoenviron. Eng. 139 (2): 210–222. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000753.
Roling, M. J., S. Sritharan, and M. T. Suleiman. 2010. Development of LRFD design procedures for bridge pile foundations in Iowa—Vol. 1: An electronic database for PIle LOad Tests (PILOT) in Iowa. Final Rep. I for IHRB Projects: TR-573, TR-583 and TR-584. Ames, IA: Institute of Transportation, Iowa State Univ.
Information & Authors
Information
Published In
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 12, 2019
Accepted: Apr 15, 2020
Published online: Jun 11, 2020
Published in print: Aug 1, 2020
Discussion open until: Nov 11, 2020
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.