This report presents the reliability-based analysis of the calibration of resistance factors for the Load and Resistance Factor Design (LRFD) of axially loaded drilled shafts. AASHTOs 2012 LRFD Bridge Design Specifications recommends various resistance factors for the design of deep foundations; however, since these values are not specific to any one region, they are very conservative. For Louisiana or Mississippi, the adoption of such recommended resistance factors could substantially increase foundation sizes. Therefore, it is necessary to develop a database of drilled shaft load tests performed in the regions of Louisiana, Mississippi, and surrounding states with similar soil conditions. Sixty-nine drilled shaft load tests were collected from the Louisiana and Mississippi Departments of Transportation to develop this database. The measured nominal resistances of the drilled shafts were determined at various settlement criteria using the provided static load test data, and the predicted resistances were calculated from soil boring data using both the 1999 Federal Highway Administration (FHWA) drilled shaft design method (Brown et al.) and the 2010 FHWA design method (ONeill and Reese). The performance of each design method is evaluated through statistical analyses of the predicted resistances versus the measured resistances, and FOSM and the Monte Carlo simulation method are utilized to perform the LRFD calibration of the resistance factors for the Strength I Limit State as defined by AASHTO. The calibration performed in this study confirms that the Monte Carlo simulation method is a more accurate and reliable method in determining the resistance factors; it also shows that while the 2010 FHWA drilled shaft design method is a more accurate method, it produces smaller total resistance factors than the 1999 FHWA design method.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04012016-184124 |
| Date | 14 April 2016 |
| Creators | Fortier, Alicia Rae |
| Contributors | Abu-Farsakh, Murad, Jung, Jongwon, Chen, Shengli, Barbato, Michele |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04012016-184124/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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