LRFD for Large-Diameter Bored Piles in Egypt

Abstract

The main goal of this study is to implement the load and resistance factors design (LRFD) approach for large-diameter bored piles considering the use of various static analysis methods available in the American Association of State Highway and Transportation Officials (AASHTO) specifications and the Egyptian code of practice. Exclusively, reliability-based LRFD resistance factors were calibrated for the O'Neill and Reese, the ECDF, and the Brown et al. methods using a wide range of soil types-knowing that these design methods are used in the current AASHTO specifications, the 2001 Egyptian code, and the 2010 Federal Highway Administration (FHWA) design manual for deep foundations, respectively. The analysis was based on a newly developed national electronic database that consists of information from more than 90 static load tests. From the main findings, the values of the resistance factors for the 2001 ECDF method ranged from 0.86 to 0.41. However, the 2010 FHWA method generally provided higher efficiency compared with the 2007 AASHTO method and the 2001 ECDF in sand, clay, and mixed soils.