Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)
Compression & uplift static capacity of driven concrete piles
M. Hussein, B. Jory & M. Sharp
A pile driving and testing program was undertaken at a construction site for a highway bridge in Florida, USA. Fifteen prestressed concrete piles, 762 mm (30 inch) square with a 457 mm (18 inch) circular void throughout their lengths, were driven as probe piles with a single acting air hammer. Subsurface conditions were variable consisting of layers of loose sand, sandy clay and clayey sand, underlain by limestone bedrock. All piles were dynamically tested with aPile Driving Analyzer during initial installation and restrikes. Further analysis of the dynamic data was performed according to the CAPWAP Method. Two of the piles were statically tested, to failure, in compression and uplift. Correlations between dynamically predicated and statically measured pile compression capacities and pile head load-movement relationships agreed well. It was concluded that uplift pile capacities were approximately 60% of the total compression values and an average of approximately 75% of compression shaft resistance. This paper presents discussions on pile installation and testing procedures and results, with particular emphasis on the two statically tested piles.
|article #777; publication #36 (IC-1994)|