# AASHTO LRFD AXIAL DESIGN OF A DRIVEN PILE AT THE STRENGTH LIMIT STATE (BRIEF DESCRIPTION).

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1 AASHTO LRFD AXIAL DESIGN OF A DRIVEN PILE AT THE STRENGTH LIMIT STATE (BRIEF DESCRIPTION). By: Naser M. Abu-Hejleh, Ph.D., P.E. Geotechnical Engineer Specialist FHWA Resource Center Olympia Fields, IL Ph , Fax Jerry A. DiMaggio, P.E. Principal Geotechnical Engineer and National Program Manager The Office of Bridge Technology FHWA-Headquarters 1200 New Jersey Avenue, SE. Washington, DC Ph ; Fax: William M. Kramer, P.E. State Foundations and Geotechnical Unit Chief Bureau of Bridges and Structures Illinois Department of Transportation 2300 S. Dirksen Parkway Springfield, IL Phone: (217)

4 Note that Q fmax. and L max are function of the pile structural and geotechnical resistances as will be discussed later. Q fmax? Known factored axial compressive structural load, Q f L max? Given: 1. Soil information 2. Pile type/sizeiven H or CIP Pipe Pile L? Figure 1. Information Needed in the Design of a Single Driven Pile For a single specific pile type/size driven into a soil/rock layer, the design of a pile group requires the calculations of Q fmax, L max (See Figure 1) to Estimate preliminary number of piles in the pile group = Total factored axial structural load applied to the top of the pile group/q fmax. The rigid cap analysis is often used to compute the top factored axial load carried by various piles in the pile group, and determine the piles that carry the maximum factored top axial load, Q f. Ensure that Q f does not exceed Q fmax. The pile length (for all piles in the group) to meet the axial compression strength limit, L, is often computed based on Q f. If Q f is smaller than Q fmax (larger number of piles), L would be smaller than L max (smaller pile lengths). Ensure that the pile lengths to meet these other design requirements (AASHTO Section ; e.g., lateral loading, settlement, uplift) do not exceed L max. The designer should consider alternative pile types/sizes or increase the number of piles to meet the last two requirements. Q fmax and L max for all alternative pile type/sizes should be developed and provided to the foundation designer. 4

5 The LRFD design of a friction paper is discussed in Section 1 and the LRFD design of a pile seated on top of hard rocks is discussed in Section 2. The LRFD design procedure is demonstrated for two common driven pile types: H-Piles and Cast-in-place (CIP) pipe piles. Notes. -It is assumed that readers of this paper are familiar with the AASHTO LRFD design specifications for driven piles, and the ASD design of driven piles (common terms for piles such as setup, downdrag, and wave equation analysis) as discussed by Hannigan et. al. (2005). -Only axial compression geotechnical strength limit for a single pile is discussed in this paper. Other LRFD Limits and design requirements for a single and group of piles should be evaluated & met in the final design. 1. DESIGN OF A FRICTION PILE (H AND CIP PIPE PILES) The design procedure based on both the static and field methods is discussed in the following five topics. 1.1 Pile Nominal Static Geotechnical Resistances Predictions of Resistances for the Field Methods in the Design Phase Determination of Q fmax and L max Based on Correlation to Past ASD Practices By Meeting Structural and Geotechnical Strength Limit States (including driveability) Determination of Pile Length Based on Static Analysis Methods Based on Field Methods Design of a Friction H-Pile into soft rocks and glacial tills Field verification of Pile Bearing Resistances. This is needed when the pile length will be finalized based on the field methods. 2. LRFD DESIGN OF H-PILE SEATED ON HARD ROCK H-piles are specifically considered here as they are almost exclusively used when hard rock is present. The design procedure presented in this section cover the following topics: Definition of hard rock. LRFD Analysis. Required driving resistances. Driveability Analysis in the design phase for construction control. Field Construction Control. 5

6 CONCLUSIONS AND RECOMMENDATIONS The paper provides an interpretation of the AASHTO LRFD design specifications for the axial design of a single driven pile at the strength limit state. The provided content should be helpful to highway agencies to implement LRFD and may be appropriate for inclusion within their respective design and construction manuals. Illustrated examples demonstrate that H-piles (50 ksi steel) seated on hard rock should be designed for design service stresses of 18 ksi and that friction piles can support design service stresses up to 22 ksi with easy driving conditions (or up to 18 ksi with hard driving conditions). If implemented, it would lead to significant savings to DOTs when compared to their existing ASD practice. Consideration of setup and conducting drivability analysis in the design phase and PDA during construction would lead to more savings. Static analysis method should be considered by the highway agencies, at minimum to supplement the field methods. Local setup factors based on EOD and BOR resistances from field methods should be collected. Local bias information between the resistance measured by the field methods and predictions from the static analysis methods and wave equation analysis should also be collected to improve and optimize local design methods. Local calibration of φ based on a program of load tests is strongly recommended to account for the State s specific geology, testing, construction conditions. Other recommendations to benefit from setup in the calibration of local resistance factor are discussed in the companion paper. With larger loads allowed at the strength limit, it becomes more critical to evaluate the serviceability limit in the LRFD design. REFERENCES AASHTO. LRFD Bridge Design Specifications. American Association of State Highway and Transportation Officials, Fourth Edition. Washington, D.C., USA Hannigan, P., Goble, G., Thendean, G., Likins, G., and Rausche, F., 2005, Design and Construction of Driven Pile Foundations, NHI Course Nos and 13222, Workshop Manual. 6

7 7

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