Assessment of Variable Uncertainties for Reliability-Based Design of Foundations |
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Authors: | K. C. Foye R. Salgado B. Scott |
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Affiliation: | 1Senior Staff Engineer, CTI & Associates, Inc., 12482 Emerson Dr., Brighton, MI 48116; formerly, Doctoral Student, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284 (corresponding author). E-mail: kfoye@cticompanies.com 2Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284. E-mail: rodrigo@ecn.purdue.edu 3Staff Engineer, Thelen Associates, Inc., Erlanger, KY; formerly, Doctoral Student, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284.
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Abstract: | LRFD shows promise as a viable alternative to the present working stress design (WSD) approach to shallow foundation design. The key improvements of LRFD over the traditional WSD are the ability to provide a more consistent level of reliability and the possibility of accounting for load and resistance uncertainties separately. For LRFD to gain acceptance in geotechnical engineering, a framework for the objective assessment of resistance factors is needed. Such a framework, based on reliability analysis, is proposed in this paper. Probability density functions (PDFs), representing design variable uncertainties, are required for analysis. A systematic approach to the selection of PDFs is presented. A procedure such as that proposed provides a rational probabilistic basis for the development of LRFD methods in geotechnical engineering. |
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Keywords: | Load and resistance factor design Limit state Calibration Reliability analysis Foundation design In situ tests Cone penetration tests |
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