Resistance Factors for Use in Load and Resistance Factor Design of Driven Pipe Piles in Sands

K. C. Foye

Project Engineer, CTI and Associates, Inc., Brighton, MI; formerly, Doctoral Student, School of Civil Engineering, Purdue University, West Lafayette, Indiana, USA

G. Abou-Jaoude

Assistant Professor, Dept. of Civil Engineering, Lebanese American University, Byblos, Lebanon

M. Prezzi

Associate Professor, School of Civil Engineering, Purdue University, West Lafayette, Indiana, USA

R. Salgado

Professor, School of Civil Engineering, Purdue University, West Lafayette, Indiana, USA

This paper is part of the Journal of Geotechnical and Geoenvironmental Engineering, Vol. 135, No. 1, January 1, 2009. ©ASCE, ISSN 1090-0241/2009/1-1–XXXX.

In structural design, design methods are well standardized. In contrast, engineers have many pile design methods from which to choose. Each method has unique sources of uncertainty that should lead to unique resistance factors. In this paper, we computed resistance factors appropriate for use in specific direct and property-based design methods for driven pipe piles in sands. Resistance factors are a useful quantitative tool to express the relative uncertainty of load capacity of different pile types and pile design methods. This paper illustrates an approach to uncertainty assessment that seeks to isolate the various sources of uncertainty. Using this approach, reliability analysis is used to develop resistance factors for the design of driven pipe piles in sand.

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