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Transfer Length Of Strands In Prestressed Concrete Piles, Baolin Wan, Kent A. Harries, Michael F. Petrou
Transfer Length Of Strands In Prestressed Concrete Piles, Baolin Wan, Kent A. Harries, Michael F. Petrou
Civil and Environmental Engineering Faculty Research and Publications
A top bar effect has been identified in prestressed concrete piles. The effect that this top bar effect has on the development of the prestressing strand is investigated. Strand transfer length is found to be proportional to the observed end slip. While the average transfer length of all strands in a section may satisfy the assumptions inherent in the ACI transfer length equation, due to the top bar effect, top-cast strand transfer lengths are considerably in excess of the ACI-calculated value. The flexural behavior of the pile, accounting for varying transfer lengths through its section, is investigated. Finally, recommendations for …
Top Bar Effects In Prestressed Concrete Piles, Baolin Wan, Michael F. Petrou, Kent A. Harries, Aly A. Hussein
Top Bar Effects In Prestressed Concrete Piles, Baolin Wan, Michael F. Petrou, Kent A. Harries, Aly A. Hussein
Civil and Environmental Engineering Faculty Research and Publications
The top bar effect in reinforced concrete is a widely recognized phenomenon. Currently, the ACI Building Code prescribes a 30% increase in the development length of top cast reinforcing bars. No such provision is required for strands in prestressed concrete members. In this paper, the top bar effect for prestressing strands is introduced. Parameters affecting top bar phenomena in prestressed concrete piles are identified, and strategies for reducing this effect are presented. Finally, for the first time, the application of a top bar effect factor for prestressed concrete development length calculations, similar to the one applied in reinforced concrete structural …