00738873

Component

https://doi.org/10.3141/1569-06

http://scholar.google.com...eill&publication_year=1997

Present-generation resistance factors for foundations in load and resistance factor design (LRFD) do not necessarily reflect directly the variance in site-specific resistance and bias in making resistance estimates. The purpose of this paper is to describe a process whereby resistance factors can be determined from experimental data at a site and to demonstrate that process for driven piles at a specific site in overconsolidated clay. Eleven pipe piles were tested to failure in compression, and 28 cone penetrometer tests (CPTs) were performed near the piles. The CPT results were characterized through both a geostatistical method and a random sampling technique to estimate resistance factors for ultimate pile resistances using three CPT methods and two alpha-methods. A first-order, second-moment reliability method was applied using the interpreted bias characteristics of the design methods and the dispersion characteristics of the CPT and pile tests to relate resistance factors to selected reliability indexes. The resistance factors obtained for this site by this process were 0.50 to 0.62 for the three CPT methods and 0.30 to 0.55 for the alpha-methods for a target reliability index of 3.5, depending on the value selected for the live load factor.

This paper appears in Transportation Research Record No. 1569, Design and Analysis of Foundations and Sand Liquefaction.

English

p. 47-54

1997

Transportation Research Record

0309059720

Figures (5) ; References (19) ; Tables (3)

Bridge foundations; Clay; Cone penetrometers; Overconsolidation; Pipe; Structural tests; Support piles

Driven piles; Pipe piles; Resistance factors

Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics

TRIS, TRB

Jul 11 1997 12:00AM

• CENTRIFUGE TESTING OF PLUMB AND BATTERED PILE GROUPS IN SAND
• ENHANCED IN SITU GEOTECHNICAL TESTING FOR BRIDGE FOUNDATION ANALYSIS
• INNOVATIVE LOAD TESTING OF DEEP FOUNDATIONS
• PEAK UNDRAINED RESISTANCE OF LOOSE SANDS
• PREDICTION OF LATERAL LOAD RESPONSE FOR A PILE GROUP
• SOIL-PILE-SUPERSTRUCTURE INTERACTION IN LIQUEFIABLE SAND
• THE FLORIDA PIER ANALYSIS PROGRAM: METHODS AND MODELS FOR PIER ANALYSIS AND DESIGN