United States Department of Transportation
i
Driven Precast Prestressed Concrete (PPC) Pile Design and Construction Optimization
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2019-01-01
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[PDF-5.09 MB]
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Abstract:The objective of the research detailed within this document was to investigate the origins of the ALDOT standard capacities and determine whether the capacities of ALDOT’s standard piles could reasonably be increased to allow for more efficient pile usage. To accomplish this goal, several primary tasks were completed. The first major task was developing a thorough review of the current state of practice within similar DOT offices to understand how their pile capacities were determined. This included developing and administering an online survey to gather pile design information from these organizations. Simultaneously, the current ALDOT design values were closely analyzed to determine likely origins to their values. This included investigating the two different design methodologies that would have been used to arrive at the values in at least some capacity, Allowable Stress Design (ASD) and Load and Resistance Factor Design (LRFD). Within the ASD consideration, the origins of the typical axial pile capacity equation were tracked down and evaluated. The second major task came from developing a moment-axial interaction diagram program for ALDOT standard PPCPs. This program was developed using Microsoft Excel and Visual Basic for Applications (VBA) coding. These interaction diagrams serve as design aids for showing the theoretically safe thresholds of a pile’s combined axial and moment loading. Through this analysis, the available structural capacity of the cross section is visualized, and it is significantly higher than those values provided in the current ALDOT standard pile capacity table.
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